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Omega Engineering CYD218 User's Manual

1. Attach the shield pin on the sensor connector to the cable shield Do not attach the cable shield at the other end of the cable not even to ground Run different inputs and outputs in their own shielded cable Use twisted wire inside the cooling system Use a grounded receptacle for the instrument power cord Consider ground strapping the instrument chassis to other instruments or computers EES Installation 3 5 Omega Model CYD218 Temperature Monitor User s Manual 3 3 3 Terminal Block MODEL CYD218S only The terminal block on the Model CYD218S rear panel contains signals for analog outputs and alarm relays The terminal block connectors are detachable remove the top or bottom half from the instrument for convenient wire installation Use up to 12 AWG stranded copper wire with the terminals Smaller wire is suitable for most applications RELAYS 30 VDC5A AMOG RELAY 1 RELAY2 RELAY3 RELAY4 1 EERSREREEEERSRR EREEREER RELAY 5 RELAY6 RELAY7 RELAY8 2 Figure 3 4 Terminal Block Connector 3 3 3 1 RELAYS MODEL CYD218S only Table 3 2 Terminal Block Connector Pins e 4 zi e Reay3com 22 Relay7COM aleng 23 Retay7NO ailaxuiuauio The Model CYD218 has eight relays most commonly associated with the alarm feature If a relay is inactive Off it is in its normal state of open or closed When the relay is active On it is in the opposite state The relay contac
2. Generate SoftCal Curve SCAL lt std gt lt dest gt lt SN gt lt T1 value gt lt U1 value gt lt T2 value gt lt U2 value gt lt T3 value gt lt U3 value gt Nothing lt std gt Specifies the standard curve to generate a SoftCal from 1 6 7 lt dest gt Specifies the user curve to store the SoftCal curve 21 28 lt SN gt Specifies the curve serial number Limited to 10 characters lt T1 value gt Specifies first temperature point lt U1 value gt Specifies first sensor units point lt T2 value gt Specifies second temperature point lt U2 value gt Specifies second sensor units point lt T3 value gt Specifies third temperature point lt U3 value gt Specifies third sensor units point SCAL 1 21 4 2 1 6260 77 32 1 0205 300 0 0 5189 term Generates a three point SoftCal curve from DT 470 and saves it in user curve 21 Query Sensor Units Reading for a Single Input or all Inputs Input Returned Remarks SRDG lt input gt lt sensor units value gt Format nn nnn term Or if all units are queried lt input 1 Sensor Units Value gt lt Input 2 Sensor Units Value gt lt Input 3 Sensor Units Value gt lt input 4 Sensor Units Value gt lt Input 5 Sensor Units Value gt lt Input 6 Sensor Units Value gt lt Input 7 Sensor Units Value gt lt Input 8 Sensor Units Value gt Format nn nnn nn nnn nn nnn tnn nnn tnn nnn tnn nnn nn nnn tnn nnn Returns the Sensor Units reading fo
3. gSend True End Sub Private Sub Form_Load Dim strReturn As String Dim strHold As String Dim Term As String Dim ZeroCount As Integer Dim strCommand As String frmSerial show Term Chr 13 Chr 10 ZeroCount 0 strReturn strHold If frmSerial MSComml PortOpen True Then frmSerial MSComml PortOpen False End If frmSerial MSComml CommPort 1 frmSerial MSComml Settings 9600 0 7 1 frmSerial MSComml InputLen 1 frmSerial MSComml PortOpen True Do DoEvents Loop Until gSend True gSend False strCommand frmSerial txtCommand Text strReturn strCommand UCase strCommand If strCommand EXIT Then End End If frmSerial MSComml Output strCommand amp Term If InStr strCommand lt gt 0 Then Routine to handle Send button press Set Flag to True Main code section Used to return response Temporary character space Terminators Counter used for Timing out Data string sent to instrument Show main window Terminators are lt CR gt lt LF gt Initialize counter Clear return string Clear holding string Close serial port to change settings Example of Comm 1 Example of 9600 Baud Parity Data Stop Read one character at a time Open port Wait loop Give up processor to other events Loop until Send button pressed Set Flag as false Get Command Clear response display Set all characters to upper case
4. COMPLIANT www omega com info omega com CYD218 SERIES Cryogenic Digital Thermometers MADE IN WARRANTY DISCLAIMER OMEGA ENGINEERING INC warrants this unit to be free of defects in materials and workmanship for a period of 13 months from date of purchase OMEGA s WARRANTY adds an additional one 1 month grace period to the normal one 1 year product warranty to cover handling and shipping time This ensures that OMEGA customers receive maximum coverage on each product If the unit malfunctions it must be returned to the factory for evaluation OMEGA s Customer Service Department will issue an Authorized Return AR number immediately upon phone or written request Upon examination by OMEGA if the unit is found to be defective it will be repaired or replaced at no charge OMEGA s WARRANTY does not apply to defects resulting from any action of the purchaser including but not limited to mishandling improper interfacing operation outside of design limits improper repair or unauthorized modification This WARRANTY is VOID if the unit shows evidence of having been tampered with or shows evidence of having been damaged as a result of excessive corrosion or current heat moisture or vibration improper specification misapplication misuse or other operating conditions outside of OMEGA s control Components which wear are not warranted including but not limited to contact points fuses and triacs OMEGA is pleas
5. Get out on EXIT Send command to instrument Check to see if query While ZeroCount lt 20 And strHold lt gt Chr 10 Wait for response If frmSerial MSComml InBufferCount 0 Then Add 1 to timeout if no character frmSerial Timerl Enabled True Do DoEvents Wait for 10 millisecond timer Loop Until frmSerial Timerl Enabled False ZeroCount ZeroCount 1 Timeout at 2 seconds Else ZeroCount 0 strHold frmSerial MSComml Input strReturn strReturn strHold End If Wend Get characters until terminators Reset timeout for each character Read in one character Add next character to string If strReturn lt gt Then Check if string empty strReturn Mid strReturn 1 InStr strReturn Term 1 Strip terminators Else strReturn No Response End If frmSerial txtResponse Text strReturn Put response in textbox on main form strHold Reset holding string ZeroCount 0 Reset timeout counter End If Loop End Sub Private Sub Timerl Timer frmSerial Timerl Enabled False End Sub Send No Responge Routine to handle Timer interrupt Turn off timer 6 12 Remote Operation Omega Model CYD218 Temperature Monitor User s Manual 6 2 7 2 Quick Basic Serial Interface Program Setup The serial interface program Table 6 5 works with QuickBasic 4 0 4 5 or Qbasic on an IBM PC or compatible running DOS or in a DOS window with a serial interface It uses the COM1 communic
6. If required reattach 19 inch rack mounting brackets Connect power cord to rear of unit and set power switch to On I GEET ea Peon Service Omega Model CYD218 Temperature Monitor User s Manual 7 10 EPROM AND NOVRAM REPLACEMENT The operating software for the Model CYD218 is contained on one Erasable Programmable Read Only Memory EPROM Integrated Circuit IC The reference designator for the EPROM is U17 See Figure 7 6 The EPROM has a sticker on top labeled with M218 HEX and the date The reference designator for the Non Volatile Random Access Memory NOVRAM IC is U24 Use the procedure below to replace either the EPROM or the NOVRAM NOTE The factory may provide the CalCurves to users in U24 NOVRAM CAUTION The EPROM and NOVRAM are Electrostatic Discharge Sensitive ESDS devices Wear e shock proof wrist straps resistor limited to lt 5 mA to prevent injury to service personnel and to avoid inducing an Electrostatic Discharge ESD into the device 1 Follow the top of enclosure REMOVAL procedure in Paragraph 7 9 2 Locate EPROM U17 M218 HEX or NOVRAM U24 on the main circuit board Note orientation of existing IC See Figure 7 6 3 Use IC puller to remove existing EPROM NOVRAM from socket Noting orientation of new EPROM NOVRAM use an IC insertion tool to place new device into socket Follow the top of enclosure INSTALLATION procedure in Paragraph 7 9 DALLAS A KG E Match notch on 01 01 01
7. 0 no errors found 1 errors found WAI Wait to Continue Input WAI Returned Nothing Remarks This command is not supported in the Model CYD218 6 18 Remote Operation Omega Model CYD218 Temperature Monitor User s Manual ALARM Configure Input Alarm Parameters Input ALARM lt input gt lt off on gt lt source gt lt high value gt lt low value gt lt deadband gt lt latch enable gt Returned Nothing Remarks Configures the alarm parameters for an input lt input gt Specifies which input to configure 1 8 lt off on gt Determines whether the instrument checks the alarm for this input lt source gt Specifies input data to check 1 Kelvin 2 Celsius 3 sensor units 4 linear data lt high value gt Sets the value the source is checked against to activate the high alarm lt low value gt Sets the value the source is checked against to activate low alarm lt deadband gt Sets the value that the source must change outside of an alarm condition to deactivate an unlatched alarm lt latch enable gt Specifies a latched alarm remains active after alarm condition correction Example ALARM 3 1 1 320 5 250 0 1 0 O term Turns on alarm checking for input 3 activates high alarm if Kelvin reading is over 320 5 and deactivates the alarm when reading falls below 320 5 K minus the deadband or 319 5 K Activates low alarm if Kelvin reading falls below 250 0 K and deactivates the alarm when the reading
8. 5 1 FRONT PANEL CURVE ENTREE 5 1 5 1 1 Curve Header Parameters cccccccscsscsscesscssecseesecseseeceseceeeeessescssesessasssrseeeasersusnterevseeass 5 1 5 1 2 Curve Break points iii as 5 2 5 1 3 Editing An Existing UNO E EE 5 2 5 1 4 Eengel 5 3 5 1 5 Erasing User e 5 4 5 1 6 Viewing Standard Cunves ostene seunes stee nn nanana ae eneee rna 5 4 5 1 7 elle Ber 5 4 5 2 SOTA Md tl A 5 5 5 2 1 SoftCal and Silicon Diode Sensors oooooocnnocccconocccnooocccononncconnnonanonanan crac ono nccono no nacanonnnoss 5 5 5 2 2 SoftCal Accuracy with Silicon Diode Sensors crono ronanonnnenono 5 6 5 2 3 SoftCal and Platinum Sensors ooococcocnnccnncnoccconnconcconcconononononnanana nano nonn non ccnn nono nanoccanccannonos 5 6 5 2 4 SoftCal Accuracy with Platinum Sensors ooooooccninocinconocccocccnnananononananocinoccnnrrancnoncann rancios 5 6 5 2 5 Creating a SoftCal Calibration Curve oooooonnccnininnonicnncnnconannnrnnnranonornnoronooncnno ro nana cnn cancion 5 7 5 3 DATA LOGGING cocida ainia dina 5 8 5 3 1 OG Sl A Ed cta ia 5 8 5 3 2 Starting and Stopping Data Log 5 9 5 3 3 Viewing Logged Data 5 9 5 3 4 Cine POWer LOS ii S EE 5 10 5 4 PRINTING cidcid ia dais 5 10 5 4 1 Printer SUPPOME ec id o ad ias 5 10 5 4 2 Printer Connector and Cable cc ccccccccsscesccsccssecscesecssesecusccaaccesseaceacseeseaecsasensuasenersres 5 10 5 4 3 ele e HE 5 11 ii Table of Contents Omega Model CYD218 Temperature Monitor User s Manual TAB
9. Displays Kelvin reading for input 4 in display location 2 DISPFLD Query Displayed Field Input DISPFLD lt location gt Returned lt input gt lt source gt Format n n n term Remarks Returns the parameters for a displayed field See DISPFLD command for returned parameter descriptions lt location gt specifies display location to query 1 8 6 22 Remote Operation Omega Mode CYD218 Temperature Monitor User s Manual FILTER Configure Input Filter Parameters Input FILTER lt input gt lt off on gt lt points gt lt window gt Returned Nothing Remarks lt input gt Specifies input to configure 1 8 lt offlon gt Specifies whether the filter function is off or on 0 Off 1 On lt points gt Specifies how many data points the filtering function uses 2 64 lt window gt Specifies what percent of full scale reading limits the filtering function 1 10 Reading changes greater than this percentage reset the filter Example FILTER 4 1 10 2 term Filter input 1 data through 10 readings with 2 of full scale window FILTER Query Input Filter Parameters Input FILTER lt input gt Returned lt off on gt lt points gt lt window gt Format n nn nn term Remarks Returns input filter configuration See FILTER command for returned parameter descriptions lt input gt specifies which input to query 1 8 IEEE Configure EEE 488 Interface Parameters Input IEEE lt terminator gt lt EOI
10. Off No filtering for the specified input ath Setue The eighth display of the Math setting sequence appears M z P Se tur Use the Data Selection keys to select the number of filter Input 1 points from 2 to 64 Press Enter Select with A The ninth display of the Math setting sequence appears Filter Window H Operation 4 7 Omega Model CYD218 Temperature Monitor User s Manual Use the Data Selection keys to select the filter window from 1 to 10 then press Enter to return to the normal display Press Escape at any time to return to the normal display The instrument retains values changed prior to pressing Escape 4 8 ANALOG OUTPUTS MODEL CYD218S ONLY The Model CYD218S has two analog voltage outputs numbered 1 and 2 They are commonly configured to send a voltage proportional to temperature to a strip chart recorder or data acquisition system The outputs can also be manually controlled as a voltage source for any other application The analog outputs are variable DC voltage sources that can vary from 10V to 10V The voltage is generated by a 14 bit D A converter with resolution of 1 25 mV or 0 0125 of full scale The output is short protected but should never be used to drive a resistance lower than 1 kQ Analog output terminals are in the detachable terminal block on the Model CYD218S rear panel The analog outputs each have three modes of operation off input and manual Once a mode is selected the parame
11. Remarks Returns input type parameters lt input group gt Specifies input group to query A inputs 1 4 B inputs 5 8 lt sensor type gt Specifies input sensor type Valid entries 0 2 5V Diode 2 2500 Platinum 4 5kQ Platinum 1 7 5V Diode 3 500 Platinum 5 Cernox KEYST Query Keypad Status Input KEYST Returned lt keypad status gt Format n term Remarks Returns keypad status since the last KEYST 1 key pressed 0 no key pressed KEYST returns 1 after initial power up KRDG Query Kelvin Reading for a Single Input or All Inputs Input KRDG lt input gt Returned lt Kelvin value gt Format nn nnn term Or if all inputs are queried lt Input 1 Kelvin Value gt lt Input 2 Kelvin Value gt lt Input 3 Kelvin Value gt lt Input 4 Kelvin Value gt lt Input 5 Kelvin Value gt lt Input 6 Kelvin Value gt lt Input 7 Kelvin Value gt lt Input 8 Kelvin Value gt Format nn nnn nn nnn tnn nnn t nn nnn tnn nnn nn nnn t nn nnn nn nnn Remarks Returns the Kelvin reading for a single input or all inputs lt input gt specifies which input s to query 0 all inputs 1 8 individual input NOTE Use 0 all inputs when reading two or more inputs at the maximum update rate of 16 redgs sec 6 24 Remote Operation Omega Model CYD218 Temperature Monitor User s Manual LINEAR Configure Input Linear Equation Parameters Input LINEAR lt input gt lt varM value gt lt X source gt lt varB value gt R
12. Tl Joon in In mg V E E ie 1 1 Et Operation 4 3 Omega Model CYD218 Temperature Monitor User s Manual The third display in the setting sequence appears Use the Data Selection keys to cycle through the source selections DisP FO armar for the selected display location ise Locati or i K Kelvin temperature reading from input Sele S i bh A Cc Celsius temperature reading from input T TTE prr Sensor Sensor units reading from input GAIE S Linear Linear equation data from input Min Results of Minimum Math function Max Results of Maximum Math function Press Enter when the desired source appears The normal display appears with the selected sensor input and source displayed in the selected location Press Escape at any time to return to the normal display The instrument retains values changed prior to pressing Escape Repeat the sequence for other display locations 4 5 INPUT TYPE The Model CYD218 supports a variety of temperature sensors sold by Omega Engineering and other manufactures An appropriate sensor type must be selected for each group of inputs Refer to Table 4 1 fora list of display messages and common sensor types If a particular sensor is not listed in the Input Type selection look at Table 1 2 to find a sensor with similar range and excitation Sensor type is selected for all sensors in a group 1 4 or 5 8 All sensors in a group must share the same excitation and range The two
13. Units E Lod Setur Set Time HH2HMESS 4 K dkde L a Pee sel BR sf E number keys to input the time of day in hours 01 24 minutes 01 60 and seconds 01 60 After inputting the correct time press Enter The final display in the setting sequence appears Use the number keys to input the date in month 01 12 day 01 31 year 00 99 format After inputting the date press Enter NOTE The Model CYD218 is Y2K compliant h I oe Pals ES 5 3 2 Starting and Stopping Data Log The Log On Off key is used to start and stop data logging The start and overwrite parameters set with Log Setup determine the operation of Log On Off key If start is set to clear the Log On Off key will first clear the data buffer of old records and then begin the log sequence Pressing Log On Off again will stop the log sequence so data can be viewed or printed If overwrite is set to no the log sequence will stop automatically at the end of the data buffer If overwrite is set to yes new records will continue to overwrite old ones until the sequence is stopped Whichever method stops the log sequence all logged data will be lost when the a new log sequence is begun If start is set to continue the Log On Off key will begin the log sequence at the end of the old records Pressing Log On Off again will stop the sequence If overwrite is set to no the log sequence will stop automatically at the end of the data buffer If overwrite is set to ye
14. disabled or 1 enable lt status gt A parameter with status in the name uses these values 0 disabled off or 1 enabled on lt value gt A parameter with value in the name is specified in floating point format lt bit weighting gt A number between 0 and 255 derived from the sum of all the weighted bit values lt input gt Indicates which sensor input to use Valid values 1 8 lt off on gt Indicates whether an item is turned off or turned on 0 is off and 1 is on lt output gt Indicates which analog output to use Valid values 1 2 term Used when examples are given and indicates where terminating characters should be Se 4 the user or where they appear on a returning character string from the Model Remote Operation 6 15 Command CLS ESE ESE ESR IDN OPC OPC RST SRE SRE STB TST WAI ALARM ALARM ALARMST ALMB ALMB ALMRST ANALOG ANALOG AOUT BAUD BAUD CRDG CRVDEL CRVHDR CRVHDR CRVPT CRVPT DATETIME DATETIME DFLT DISPFLD DISPFLD FILTER Omega Model CYD218 Temperature Monitor User s Manual ae ee _ Da A A SS 00 EE Table 6 5 Model CYD218 Interface Commands Function Clear Interface Set Std Event Status Enable Query Std Event Status Enable Query Std Event Status Register Query Identification Set Operation Complete Query Operation Complete Reset Instrument Set Service Request Enable Query Service Request Enable Query Status Byte Quer
15. lt bit weighting gt Returned Nothing Remarks Each bit has a bit weighting and represents the enable disable status of the corresponding status flag bit in the Status Byte Register To enable a status flag bit send the command SRE with the sum of the bit weighting for each desired bit See the STB command for a list of status flags Example To enable status flags 0 3 4 and 6 send SRE 89 term 89 is the bit weighting sum for each bit Bit Bit Weighting Event Name 0 4 New Reading 3 8 Alarm 4 16 Error 6 64 SRQ 89 SRE Query the Configuration of Status Reports in the Service Request Enable Register Input SRE Returned lt SRE bit weighting gt Format nnn term Remarks The integer returned represents the sum of the bit weighting of the enabled bits in the Service Request Enable Register See the STB command for a list of status flags STB Query Status Byte Input STB Returned lt STB bit weighting gt Format nnn term Remarks Acts like a serial poll but does not reset the register to all zeros The integer returned represents the sum of the bit weighting of the status flag bits that are set in the Status Byte Register Bit Bit Weighting Event Name Bit Bit Weighting Event Name 0 New Reading 4 Error 1 2 Unused 5 32 ESB 2 4 Overload 6 64 SRQ 3 8 Alarm 7 128 Datalog Done TST Query Self Test Input TST Returned 0 or 1 Format n term Remarks The Model CYD218 performs a self test at power up
16. the zero offset constant was 0 00009 the gain calibration constant is 250 1 24896 200 166 This gain calibration constant is provided back to the Model CYD218 using the GCAL command for the 1 input of the group only The above process must be repeated for the remaining 3 inputs of the group Once gain calibration constants for all ranges have been determined and provided back to the Model CYD218 the CALSAVE command is issued to save the constants in the E prom 7 12 11 7 5 kQ Input Gain Calibration PURPOSE CONFIG PROCESS Service To determine the input gain errors when the input is configured for 7 5 KQ input and provide gain calibration constants back to the Model CYD218 Attach the precision 5 kQ resistors to each input of the group Be sure to connect the resistors using proper 4 lead connection techniques Input group configured for 7 5 kQ input all inputs of the group are enabled Via the interface obtain the RAWAD value of the 1 input To determine the calibration constant add the 7 5 kQ range zero offset constant to the value read and divide 5000 by that value or 5000 RAWAD reading zero offset constant For example if the value read was 1 66552 and the zero offset constant was 0 00010 the gain calibration constant is 5000 1 66542 3002 24 This gain calibration constant is provided back to the Model CYD218 using the GCAL command for the 1 input of the group only The above process must be repeated for the rema
17. 0 91243 1 12463 0 17464 0 92317 1 13598 0 18710 0 93383 d 1 15558 0 19961 0 94440 i 1 17705 0 22463 0 95487 1 19645 0 24964 E 0 96524 1 22321 0 27456 i 0 97550 1 26685 0 28701 0 98564 1 30404 0 32417 E 0 99565 1 33438 0 36111 o 1 00552 1 35642 0 41005 1 01525 4 1 38012 0 44647 E 1 02482 1 40605 0 45860 i 1 03425 A 1 43474 0 50691 1 04353 1 46684 0 51892 1 05630 1 50258 0 55494 1 06702 1 59075 0 60275 1 07750 1 62622 0 63842 1 08781 1 65156 0 67389 1 08953 5 1 67398 0 70909 l 1 09489 1 68585 0 74400 1 09864 1 69367 0 77857 1 10060 1 69818 0 80139 i 1 10263 OO JO Om P oO a eee Curve Tables A 1 Omega Model CYD218 Temperature Monitor User s Manual Table A 2 Platinum Curves Breakpoint PLATINUM 100 OHM PLATINUM 1000 OHM Number Ohms Temp mi Ohms Temp K 1 3 82000 38 2000 2 4 23500 42 3500 3 5 14600 51 4600 4 5 65000 56 5000 5 6 17000 61 7000 6 6 72600 67 2600 7 7 90900 79 0900 8 9 92400 99 2400 9 12 1800 121 800 15 0150 150 150 19 2230 192 230 23 5250 235 250 32 0810 320 810 46 6480 466 480 62 9800 629 800 75 0440 750 440 98 7840 987 840 116 270 1162 70 131 616 1316 16 148 652 1486 52 165 466 1654 66 182 035 1820 35 198 386 1983 86 216 256 2162 56 232 106 2321 06 247 712 2477 12 261 391 2613 91 276 566 2765 66 289 830 2898 30 A A A A
18. 7 6 Standard CY7 SD Diode Curve cccccecccccssccvescceeecesccecescessssecssescecsevsaaesetseeetseseaaeenteeeeeseesass A 1 alt Tu fer EE A 2 Table of Contents Omega Model CYD218 Temperature Monitor User s Manual CHAPTER 1 INTRODUCTION 1 0 GENERAL The Model CYD218 is an eight input temperature monitor that can be used with diode or resistive temperature sensors The measurement input was designed for the demands of cryogenic temperature measurement The low noise high resolution and wide operating range of the temperature monitor make it ideal for non cryogenic applications as well There are two versions of the Model Table 1 1 Supported Omega Sensors CYD218 the Model CYD218S and D R Model CYD218E Both versions have the __ Type Model Temp Range capabilities but include different ticas Silicon Diode CY7 SD 14 475 K The Model CYD218S has many Positive Temperature Coefficient RTDs interface features intended for system 100 Q Platinum PT 100 250 Q Full Scale 30 675K integration and automated data collection 30 800K that make it useful for cryogenic and 100 Q Platinum PT 100 500 Q Full Scale 30 800 K noncryogenic applications The Model Sensors sold separately CYD218S includes two computer interfaces IEEE 488 and serial Data logging memory and printer capability are included to help automate data collection Two analog voltage outputs an alarm feature and eight relays enhance system
19. A message string is a group of characters assembled to perform an interface function There are three types of message strings commands queries and responses The computer issues command and query strings through user programs the instrument issues responses Two or more command strings can be chained together in one communication but they must be separated by a semi colon Only one query is permitted per communication but it can be chained to the end of a command The total communication string must not exceed 64 characters in length A command string is issued by the computer and instructs the instrument to perform a function or change a parameter setting The format is lt command mnemonic gt lt space gt lt parameter data gt lt terminators gt Command mnemonics and parameter data necessary for each one is described in Paragraph 4 3 Terminators must be sent with every message string A query string is issued by the computer and instructs the instrument to send a response The query format is lt query mnemonic gt lt gt lt space gt lt parameter data gt lt terminators gt Query mnemonics are often the same as commands with the addition of a question mark Parameter data is often unnecessary when sending queries Query mnemonics and parameter data if necessary is described in Paragraph 6 3 Terminators must be sent with every message string The computer should expect a response very soon after a query is sent A response strin
20. Delete User Curve Input CRVDEL lt curve gt Returned Nothing Remarks Deletes a user curve lt curve gt specifies which curve to delete 21 28 for inputs 1 8 Example CRVDEL 21 term Deletes User Curve 21 input 1 user curve CRVHDR Configure Curve Header Input CRVHDR lt curve gt lt name gt lt SN gt lt format gt lt limit value gt lt coefficient gt Returned Nothing Remarks lt curve gt Specifies which curve to configure 21 28 for inputs 1 8 lt name gt Specifies curve name Limited to 15 characters lt SN gt Specifies curve serial number Limited to 10 characters lt format gt Specifies curve data format 2 V K 3 Ohm K 4 log Ohm K lt limit value gt Specifies curve temperature limit in Kelvin lt coefficient gt Specifies curve temperature coefficient 1 negative 2 positive Example CRVHDR 21 Custom 00011134 2 325 0 1 term Configures User Curve 21 input 1 user curve with a name of CUSTOM serial number 00011134 data format of volts vs Kelvin upper temperature limit of 325K and negative coefficient CRVHDR Query Curve Header Input CRVHDR lt curve gt Returned lt name gt lt SN gt lt format gt lt limit value gt lt coefficient gt Format aaaaaaaaaaaaaaa aaaaaaaaaa n nnn nnn n term Remarks Returns a standard or user curve header See CRVHDR command for parameter descriptions lt curve gt specifies which curve to query 1 5 Standard Diode Curves 6 9 Standard Plati
21. Engineering also offers a line of Cryogenic Accessories Many of the materials discussed are available through Omega Engineering and can be ordered with sensors or instruments 2 3 1 Mounting Materials The high vacuum used to insulate cryostats is one consideration in choosing sensor mounting materials Choose materials with a low vapor pressure so they do not evaporate or out gas and spoil the vacuum insulation Metals and ceramics do not have this problem but greases and varnishes must be checked Another consideration is temperature extremes most sensors are exposed to The linear expansion coefficient of a material becomes important when temperature changes are so large Never try to permanently bond materials with linear expansion coefficients that differ by more than three Use a flexible mounting scheme or the parts will break apart potentially damaging them The thermal expansion or contraction of rigid clamps or holders could crush fragile samples or sensors that do not have the same coefficient 2 2 Sensor Considerations Omega Model CYD218 Temperature Monitor User s Manual Standard Standard sensors are interchangeable within the published tolerance band Below are Standard Curve 10 Tolerance Omega Silicon Diode Temperature Sensor SoftCal Calibration A 2 point SoftCal uses data points at 77 35 K and 305 K A 3 point SoftCal uses data points at 4 2 K 77 35 K and Accuracy Bands for CY7 SD kabae DG 3
22. Lockout Prevents the use of instrument front panel controls DCL Device Clear Clears Model CYD218 interface activity and puts it into a bus idle state Finally Addressed Bus Control Commands are Multiline commands that must include the Model CYD218 listen address before the instrument responds Only the addressed device responds to these commands The Model CYD218 recognizes three of the Addressed Bus Control Commanas SDC Selective Device Clear The SDC command performs essentially the same function as the DCL command except that only the addressed device responds GTL Go To Local The GTL command is used to remove instruments from the remote mode With some instruments GTL also unlocks front panel controls if they were previously locked out with the LLO command SPE Serial Poll Enable and SPD Serial Poll Disable Serial polling accesses the Service Request Status Byte Register This status register contains important operational information from the unit requesting service The SPD command ends the polling sequence 6 2 Remote Operation Omega Model CYD218 Temperature Monitor User s Manual 6 1 2 2 Common Commands Common Commands are addressed commands which create commonalty between instruments on the bus All instruments that comply with the IEEE 488 1987 standard share these commands and their format Common commands all begin with an asterisk They generally relate to bus and instrument status and
23. Match notch on O EPROM to notch NOVRAM to notch in socket Typical EPROM in socket 1 Typical NOVRAM 7 11 ERROR MESSAGES Model CYD218 error messages during normal operation Disabled Input is turned off No Curve Input has no curve S Over Input is at over full scale S Under Input is at under negative full scale T Over Temperature conversion went off the high end of the curve T Under Temperature conversion went off the low end of the curve Error 1 Defective NOVRAM Error 2 Invalid NOVRAM Press and hold Escape for approximately 20 seconds to initialize NOVRAM See Paragraph 4 13 GEET AAA A a RA Service 7 7 Omega Model CYD218 Temperature Monitor User s Manual o g O Jo pi S Oo R68 JMP2 218s 7218 x gt 4 e 3 Default Jumper Positions JMP1 Run Test Run Position JMP2 218S 218E Position depends on Model number JMP4 IEEE Shield No jumper installed NOTE There is no JMP3 FRONT Figure 7 6 Location Of Internal Components JMP1 RUN TEST JMP4 IEEE SHIELD 7 8 Service Omega Model CYD218 Temperature Monitor User s Manual 7 12 CALIBRATION PROCEDURE Both groups of sensor inputs require calibration Sensor Input groups consist of 4 separate current sources which can supply 10 pA or 1 mA of current They are calibrated by adjusting pots on the Model CYD218 main board The Sensor Input groups consist of 4 inputs each with multiple gain configurations to ac
24. Query Linear Equation Data for a Single Input or All Inputs Input LRDG lt input gt Returned lt Linear value gt Format nn nnn term Or if all inputs are queried lt Input 1 Linear Value gt lt Input 2 Linear Value gt lt Input 3 Linear Value gt lt Input 4 Linear Value gt lt Input 5 Linear Value gt lt Input 6 Linear Value gt lt Input 7 Linear Value gt lt input 8 Linear Value gt Format nn nnn nn nnn nn nnn nn nnn nn nnn nn nnnt nn nnn nn nnn Remarks Returns the linear equation data for an input lt input gt specifies which input to query 0 all inputs 1 8 individual input NOTE Use 0 all inputs when reading two or more inputs at the maximum update rate of 16 redgs sec MNMX Configure Minimum and Maximum Input Function Parameters Input MNMX lt input gt lt source gt Returned Nothing Remarks Configures the minimum and maximum input functions lt input gt Specifies input to configure 1 8 lt source gt Specifies input data to process through max min 1 Kelvin 2 Celsius 3 sensor units 4 linear data Example MNMX 1 3 term Input 1 min max function processes data from input sensor units reading MNMX Query Minimum and Maximum Input Function Parameters Input MNMX lt input gt Returned lt source gt Format n term Remarks Returns an input min max configuration lt input gt Specifies input to query 1 8 lt source gt Specifies input data to proces
25. Sensor Package There are many types of sensor packages which generally determine sensor size thermal and electrical contact to the outside and sometimes limit temperature range Some sensors may be purchased as bare chips without a package When different packages are available for a sensor consider the sensor mounting surface and how to heat sink the leads 2 2 CALIBRATED SENSORS It can be difficult to choose the right sensor calibrate it translate calibration data into a temperature response curve understandable to the Model CYD218 and load the curve into the instrument Omega offers a variety of calibration and curve loading services to fit different accuracy requirements and budgets Traditional Calibration in Paragraph 2 2 1 SoftCal in Paragraph 2 2 2 and Standard Curves in Paragraph 2 2 3 2 2 1 Traditional Calibration Calibration compares a sensor with an unknown temperature response to an accepted standard Omega temperature standards are traceable to the U S National Institute of Standards and Testing NIST or the National Physical Laboratory in Great Britain Calibrated sensors are more expensive than uncalibrated sensors Note instrument specifications before ordering calibrated sensors A calibrated sensor is required when a sensor does not follow a standard curve if the user wishes to display in temperature Otherwise the Model CYD218 operates in sensor units like ohms or volts The Model CYD218 may not work over the full
26. alarm capability Input reading data from any source can be compared to the alarm setpoint values A reading higher than the high setpoint triggers the high alarm for that input A reading lower than the low alarm setpoint triggers the low alarm for that input If an alarm activates for a particular input the display location for that input flashes The beeper inside the instrument can also be programmed to sound if any alarms activate The eight relays on a CYD218S can also be tied to alarm functions as described in Paragraph 4 11 The system Alarm annunciator steadily displays when any alarm is enabled it flashes when any alarm activates An input need not display for the system Alarm annunciator to indicate input alarm status Latching Alarms often used to detect faults in a system or experiment that require operator intervention The alarm state remains visible to the operator for diagnostics even if the alarm condition is removed Relays often signal remote monitors or for added safety take critical equipment off line Alarm Reset clears latched alarms Operation 4 9 Omega Model CYD218 Temperature Monitor User s Manual Non Latching Alarms often tied to relay operation to control part of a system or experiment The dead band parameter can prevent relays from turning on and off repeatedly when the sensor input reading is near an alarm setpoint Example If the high alarm setpoint 100 K and the dead band 1 K the high alarm trig
27. and LN protect eyes and skin from accidental contact with liquid or the cold gas issuing from it Protect eyes with full face shield or chemical splash goggles safety glasses even with side shields are inadequate Always wear special cryogenic gloves Tempshield Cryo Gloves or equivalent when handling anything that is or may have been in contact with the liquid or cold gas or with cold pipes or equipment Wear long sleeve shirts and cuffless trousers long enough to prevent liquid from entering shoes 1 3 1 3 Recommended First Aid Post an appropriate Material Safety Data Sheet MSDS obtained from the manufacturer distributor at every site that stores and uses LHe and LN The MSDS specifies symptoms of overexposure and first aid If a person exhibits symptoms of asphyxia such as headache drowsiness dizziness excitation excessive salivation vomiting or unconsciousness remove to fresh air If breathing is difficult give oxygen If breathing stops give artificial respiration Call a physician immediately If exposure to cryogenic liquids or cold gases occurs restore tissue to normal body temperature 98 6 F by bathing it in warm water not exceeding 105 F 40 C DO NOT rub the frozen part either before or after rewarming Protect the injured tissue from further damage and infection and call a physician immediately Flush exposed eyes thoroughly with warm water for at least 15 minutes In case of massive exposure remove clothi
28. curve may not be shared between multiple inputs Collect and format all necessary information on paper before beginning the entry process Curve header information cannot be overlooked it is as important to proper operation as the data breakpoints Enter curve data breakpoints in increasing sensor units order Other instruments use this curve data format and curve breakpoints may be entered that are beyond the Model CYD218 reading capability 5 1 1 Curve Header Parameters Curve Number User curves accessed from the front panel are numbered by sensor input 1 8 When accessed over the computer interface they are numbered from 21 to 28 Name Defaults to the name User Curve for front panel entry When entering a user curve over the computer interface a curve name of up to 15 characters can be entered Serial Number Up to a 10 character sensor serial number that displays during curve selection can be entered Both numbers and letters can be entered over computer interface only numbers can be entered from the front panel Format The format parameter tells the instrument what breakpoint data format to expect Different sensor types require different formats Formats for Omega Engineering sensors are VIR Volts vs Kelvin for Diode sensors Q K Resistance vs Kelvin for platinum RTD sensors Log Q K Log Resistance vs Kelvin for NTC resistive sensors Limit Enter a temperature limit in Kelvin for the curve Default is 375 K Enter a sett
29. dewars in a well ventilated place protected from the weather and away from heat sources 1 3 1 2 Liquid Helium and Nitrogen Safety Precautions Transfer LHe and LN and operate storage dewar controls in accordance with manufacturer supplier instructions During transfer follow all safety precautions written on the storage dewar and recommended by the manufacturer WARNING Liquid helium is a potential asphyxiant and can cause rapid suffocation without warning Store and use in an adequately ventilated area DO NOT vent the container in confined spaces DO NOT enter confined spaces where gas may be present unless area is well ventilated If inhaled remove to fresh air If not breathing give artificial respiration If breathing is difficult give oxygen Get medical attention Liquid helium can cause severe frostbite to exposed body parts DO NOT touch frosted pipes or valves For frostbite consult a physician immediately If a physician is unavailable warm the affected parts with water that is near body temperature Two essential safety aspects of handling LHe are adequate ventilation and eye and skin protection Although helium and nitrogen gases are non toxic they are dangerous because they replace air in a normal breathing atmosphere Liquid helium is an even greater threat because a small amount of liquid evaporates to create a large amount of gas Store and operate cryogenic dewars in open well ventilated areas When transferring LHe
30. enable gt lt address gt Returned Nothing Remarks Configures parameters of the IEEE interface lt terminator gt Specifies the terminator 0 lt CR gt lt LF gt 1 lt LF gt lt CR gt 2 lt LF gt 3 no terminator lt EOl enable gt Disables enables the EOI mode 0 Enabled 1 Disabled lt address gt Specifies the IEEE address Example IEEE 1 0 4 term After receipt of the current terminator the instrument responds to address 4 uses lt CR gt lt LF gt as the new terminator and uses EOI mode IEEE Query IEEE 488 Interface Parameters Input IEEE Returned lt terminator gt lt EOl enable gt lt address gt Format n n nn term Remarks Returns IEEE interface parameters See IEEE command for returned parameter descriptions INCRV Configure Input Curve Number Input INCRV lt input gt lt curve number gt Returned Nothing Remarks Specifies the curve an input uses for temperature conversion lt input gt Specifies which input to configure 1 8 lt curve number gt Specifies which curve the input uses 0 none 1 5 Standard Diode Curves 6 9 Standard Platinum Curves 21 28 User curves Note Curve locations 10 20 not used Example INCRV 5 6 term Input 5 standard curve 6 PT 100 INCRV Query Input Curve Number Input INCRV lt input gt Returned lt curve number gt Format nn term Remarks Returns the input curve number See the INCRV command for parameter descriptions l
31. enabled Via the interface obtain the RAWAD value of the 1 input To determine the calibration constant add the 250 Q range zero offset constant to the value read and divide 250 by that value or 250 RAWAD reading zero offset constant For example ifthe value read was 2 48540 and the zero offset constant was 0 00005 the gain calibration constant is 250 2 48545 100 585 This gain calibration constant is provided back to the Model CYD218 using the GCAL command for the 1 input of the group only The above process must be repeated for the remaining 3 inputs of the group Once gain calibration constants for all ranges have been determined and provided back to the Model CYD218 the CALSAVE command is issued to save the constants in the E prom 7 12 10 500 Q Input Gain Calibration PURPOSE CONFIG PROCESS To determine the input gain errors when the input is configured for 500 Q input and provide gain calibration constants back to the Model CYD218 Attach the precision 250 Q resistors to each input of the group Be sure to connect the resistors using proper 4 lead connection techniques Input group configured for 500 Q input all inputs of the group are enabled Via the interface obtain the RAWAD value of the 1 input To determine the calibration constant add the 500 range zero offset constant to the value read and divide 250 by that value or 250 RAWAD reading zero offset constant For example if the value read was 1 24887 and
32. groups can be set to a different type It is recommended that all unused inputs are turned off Math Setur To select sensor type press Input Type The display to I Et 1 the right appears Use the Data Selection keys to cycle Lf IFT y through the different sensor types for Input group 1 4 Select with A When the desired type appears press Enter Linear Units E The second display in the setting sequence appears Use the Data Selection keys to cycle through the different sensor types for Input group 5 8 When the desired type appears press Enter The third display in the setting sequence appears Use the Data Selection keys to tum the displayed input On or Off then press Enter to advance to the next input Turn all unused inputs off for maximum reading rate Press Escape at any time to return to the normal display The instrument retains values changed prior to pressing Escape After setting all Input Type parameters the normal display appears The message Disabled appears in the display location of any inputs that are turned off 4 4 Operation Omega Model CYD218 Temperature Monitor User s Manual Table 4 1 Sensor Input Type Display Messages Display Message Sensor Type 2 5V Diode Silicon Diode 7 5V Diode GaAlAs Diode 250 Ohm Plat 100 Ohm Platinum RTD lt 675K Rhodium Iron RTD 500 Ohm Plat 100 Ohm Platinum RTD gt 675K 5k Ohm Plat 1000 Ohm Platinum RTD Cernox Any NTC RTD 0 75000hm Germanium Carb
33. hardware handshaking User programs must take full responsibility for flow control and timing as described in Paragraph 6 2 5 Remote Operation 6 7 Omega Model CYD218 Temperature Monitor User s Manual 6 2 3 Character Format A character is the smallest piece of information that can be transmitted by the interface Each character is 10 bits long and contains data bits bits for character timing and an error detection bit The instrument uses 7 bits for data in the ASCII format One start bit and one stop bit are necessary to synchronize consecutive characters Parity is a method of error detection One parity bit configured for odd parity is included in each character ASCII letter and number characters are used most often as character data Punctuation characters are used as delimiters to separate different commands or pieces of data Two special ASCII characters carriage return CR ODH and line feed LF OAH are used to indicate the end of a message string Table 6 2 Serial Interface Specifications Connector Type Connector Wiring Voltage Levels Transmission Distance Timing Format DE 9 D Style Connector DTE ElA RS 232C Specified 50 feet maximum Asynchronous Transmission Mode Baud Rate Half Duplex 300 1200 9600 Handshake Software timing Character Bits 1 Start 7 Data 1 Parity 1 Stop Parity Odd Terminators CR ODH LF OAH Command Rate 20 commands per second maximum 6 2 4 Message Strings
34. identification Common query commands end with a question mark Model CYD218 common commands are detailed in Paragraph 6 3 and summarized in Table 6 5 6 1 2 3 Interface and Device Specific Commands Device specific commands are addressed commands The Model CYD218 supports a variety of device specific commands to program instruments remotely from a digital computer and to transfer measurements to the computer Most device specific commands perform functions also performed from the front panel Model CYD218 device specific commands are detailed in Paragraphs 6 3 2 thru 6 3 4 and summarized in Table 6 5 6 1 3 Status Registers There are two Status registers the Status Byte Register described in Paragraph 6 1 3 1 and the Standard Event Status Register in Paragraph 6 1 3 2 6 1 3 1 Status Byte Register and Service Request Enable Register The Status Byte Register is a single byte of data containing 6 bits of information about Model CYD218 status STATUS BYTE REGISTER FORMAT WT E SO E LEA ee ee A EAS Weighting 128 64 32 16 8 4 2 1 DOG Done SRQ ESB Error Alarm OVLD Not Used New RDG Ifthe Service Request is enabled any of these bits being set will cause the Model CYD218 to pull the SRQ management low to signal the BUS CONTROLLER These bits are reset to zero upon a serial poll of the Status Byte Register These reports can be inhibited by turning their corresponding bits in the Service Request Enable Regis
35. ii A A A 2 2 2 2 3 EE Be TEE 2 2 2 3 SENSOR INSTALLATION O 2 2 2 3 1 Mounting Materials iii adi a ad wun AAA 2 2 2 3 2 Sensor LOCO iii A A 2 3 2 3 3 Thermal Conductivity eenen eat aa a aa aee raa iaa aai a a aaae 2 3 2 3 4 Contact Area eee ee desa 2 4 2 3 5 Contact TT A TAGE a casei ai BE E AANS 2 4 2 3 6 EGA ATAT e E A erer 2 5 2 3 7 A A A SESTA 2 5 2 3 8 Heat Sinking Leads eee ceeccecsssecsnseecssececceceseeesssecsseeecaeescaaeeecsseessueceseeeceaetecsseesseecsues 2 5 2 3 9 Thermal Radiation iia adds 2 5 2 3 10 Thermal EMF Compensation with Voltage Excitation s nsseesesseesesssesesesererrsrrsreseaseeses 2 5 d HNSTALEA TION ceccvsssssvcssscsndcescsvesseriseseevoeisishstececcscocsssurcedsaisauvedscdecesvees lat 3 1 3 0 GENERAL io ci 3 1 3 1 INSPECTION AND UNPACKING cccocoocccccoconnccococanonanononononnncororanncnrnnranonnroonanancnncnnncinanenaconos 3 1 3 2 REPACKAGING FOR SHIPMENT anonnnnanonnnasenneonnnnoneneoresessonenrrssesononrrrressereeerernesseornrisssssse 3 1 3 3 REAR PANEL DEFINITION o TAa ea neea a raea aa aaan adaa a a gege 3 2 3 3 1 Line INpULASSEMDIY oeie a ad 3 2 3 3 1 1 Line Voltage and Fuse Vertt cation nono no nono nanonocnnnnronanananos 3 2 3 3 1 2 Line Voltage Gelechon anno E N O Taa 3 3 3 3 1 3 Fuse Replacement 0 cccccccicsescsccccecsstsssostovececasssvscadsecdacesacavertusansivssspacedccdaeserssdabancess 3 3 3 3 1 4 Power Cold EE 3 3 3 3 1 5 POWER SWIte M sari eese o naaa daa 3 3 3 3
36. integration The Model CYD218E is configured to have a lower selling price but maintains the same level of performance It includes a serial computer interface data logging memory and printer capability The alarm feature is also present on the Model CYD218E but there are no relays The CYD218E has all the features and specifications of the 218S except IEEE 488 interface analog voltage outputs and relays 1 1 FEATURES PTC Resistor Measurements The Model CYD218 can read up to eight 100 Q 1000 Q positive temperature coefficient PTC or any other PTC resistive sensors using their standard curves or individual calibrations Platinum RTDs are known for their wide range of operation and uniform sensitivity The CYD218 can read Platinum RTDs to achieve temperature readings greater than 1000 K 727 C Platinum RTDs sold by Omega are limited to 800 K 527 C Diode Measurements The CYD218 can read up to 8 Omega CYD or any other diode temperature sensor Diode sensors are easily interchangeable and provide a wide measurement range from 1 4 475 K The diodes follow a standard temperature response curve that eliminates the need for costly or time consuming individual calibration The convenient SoftCal feature can be used to improve the accuracy of less expensive CY7 SD sensors Configurable Sensor Inputs The Model CYD218 has eight constant current sources one for each input that can be configured for a variety of Sensors The inputs c
37. measured at easily reached temperatures like the boiling point of cryogens The way to get SoftCal calibration data points is the user records the response of an unknown sensor at well controlled temperatures e User When the user can provide stable calibration temperatures with the sensor installed SoftCal calibration eliminates errors in the sensor measurement as well as the sensor Thermal gradients instrument accuracy and other measurement errors can be significant Calibration can be no better than user supplied data 5 2 1 SoftCal and Silicon Diode Sensors Silicon Diode Sensors incorporate remarkably uniform sensing elements that exhibit precise monotonic and repeatable temperature response For example the CYD Series of silicon diode sensors has a repeatable temperature response from 2 K to 475 K These sensors closely follow the Standard Curve 10 response and are interchangeable SoftCal is an inexpensive way to improve the accuracy of an already predictable sensor NOTE Standard Curve 10 is the name of the temperature response curve not its location inside the Model CYD218 Standard Curve 10 stores in Curve Location 1 in the Model CYD218 under the name CY7 SD A unique characteristic of SoftCal Point 1 SoftCal Point 2 SoftCal Point 1 DT 400 Series diodes is that Liquid Helium Liquid Nitrogen Room Temperature their temperature responses Boiling Point Boiling Point Point pass through 28 K at almost 42K 77 35 K 305 K ex
38. of event flags ESR Query Standard Event Status Register Input ESR Returned lt ESR bit weighting gt Format nnn term Remarks Queries for various Model CYD218 error conditions and status The integer returned represents the sum of the bit weighting of the event flag bits in the Standard Event Status Register Bit Bit Weighting Event Name Bit Bit Weighting Event Name 0 1 OPC 4 16 EXE 2 4 QYE 5 32 CME 3 8 DDE 7 128 PON IDN Query Identification Input IDN Returned lt manufacturer gt lt model number gt lt serial number gt lt firmware date gt Format LSCI MODEL2183S aaaaaa nnnnnn term Remarks Identifies the instrument model and software level OPC Operation Complete Command Input OPC Returned Nothing Remarks Generates an Operation Complete event in the Standard Event Status Register upon completion of all pending selected device operations Remote Operation 6 17 Omega Model CYD218 Temperature Monitor User s Manual OPC Query Operation Complete Input OPC Returned 1 Format n term Remarks Places a 1 in the controller output queue upon completion of all pending selected device operations Send this as the last command in a command string This is not the same function as the OPC command RST Reset Instrument Input RST Returned Nothing Remarks Sets controller parameters to power up settings SRE Configure Status Reports in the Service Request Enable Register Input SRE
39. press Escape once to clear the entry twice to return to the normal display Also resets memory Up Arrow Increments parameter values or selections during setting sequence Down Arrow Enter Numbers 0 9 4 2 Decrements parameter values or selections during setting sequence Accepts a new parameter value after setting sequence Also used to lock the keypad Enter numeric data during a setting sequence Operation Omega Model CYD218 Temperature Monitor User s Manual 4 2 1 General Keypad Operation There are three basic keypad operations Direct Operation Setting Selection and Data Entry Direct Operation is where the key function occurs as soon as the key is pressed Log On Off Local and Alarm Reset operate directly when the key is pressed Setting Selection allows the user to select from a list of values During a selection sequence the Data Selection keys are used to select a parameter value After a selection is made the Enter key is pressed to make the change and advance to the next setting Escape is pressed to return to the Normal display The instrument retains values changed prior to pressing Escape Some selections are made immediately after pressing a function key like Interface Most are part of a string of settings that often begins by entering an input number Data Entry expects the user to enter number data using the data entry keys Data entry keys include the numbers 0 9 and decimal point Alarm setpoints are an
40. reading of the 1 input To determine the calibration constant add the 2 5 V range zero offset constant to the value read and then divide 2 5 by that value or 2 5 RAWAD reading zero offset constant For example ifthe value read was 2 49940 and the zero offset constant was 0 00005 the gain calibration constant is 2 5 2 49945 1 00022 This gain calibration constant is provided back to the Model CYD218 using the GCAL command This constant is valid for all inputs of the group therefore GCAL must be sent 4 times assigning the constant to each input Once gain calibration constants for all ranges have been determined and provided back to the Model CYD218 the CALSAVE command is issued to save the constants in the E prom 7 12 7 7 5 Volt Input Gain Calibration PURPOSE CONFIG PROCESS To determine the input gain errors when the input is configured for 7 5 V input and provide gain calibration constants back to the Model CYD218 Same as Paragraph 7 12 4 above except the input group is configured for 7 5 V input Via the interface obtain the RAWAD reading of the 5 input To determine the calibration constant add the 7 5 V range zero offset constant to the value read and then divide 2 5 by that value or 2 5 RAWAD reading zero offset constant For example if the value read was 0 832248 and the zero offset constant was 0 00007 the gain calibration constant is 2 5 0 832241 3 00394 This gain calibration constant is provided back t
41. rises above 250 0 K plus the deadband or 251 0 K ALARM Query Input Alarm Parameters Input ALARM lt input gt Returned lt off on gt lt source gt lt high value gt lt low value gt lt deadband gt lt latch enable gt Format n n an nnn nn nnn nn nnn n term Remarks Returns the alarm parameters of an input See ALARM command for returned parameter descriptions lt input gt specifies which input to query 1 8 ALARMST Query Input Alarm Status Input ALARMST lt input gt Returned lt high status gt lt low status gt Format n n term Remarks Returns the alarm status of an input lt input gt Specifies which input to query lt high status gt Specifies high alarm status 0 Unactivated 1 Activated lt low status gt Specifies low alarm status 0 Unactivated 1 Activated ALMB Configure Audible Alarm Input ALMB lt off on gt Returned Nothing Remarks Enables or disables system alarm beeper lt off on gt disables enables beeper 1 On 0 Off ALMB Query Audible Alarm Parameters Input ALMB Returned lt beeper status gt Format n term Remarks Returns system beeper parameters ALMRST Clear Alarm Status for All Inputs Input ALMRST Returned Nothing Remarks Resets a latched active alarm after the alarm condition has cleared Remote Operation 6 19 Omega Model CYD218 Temperature Monitor User s Manual ANALOG Configure Analog Output Parameters Input ANALOG lt ou
42. the Standard Event Status Register has been set Refer to Paragraph 6 1 3 2 Error Bit 4 This bit is set when there is an instrument error not related to the bus Alarm Bit 3 This bit is set when there is an alarm condition Overload Bit 2 This bit is set when any input is in either SOVER TOVER SUNDER or TUNDER New Reading Bit 0 New data is available from at least one of the inputs AAA AA A A A A RA Remote Operation 6 3 Omega Model CYD218 Temperature Monitor User s Manual 6 1 3 2 Standard Event Status Register and Standard Event Status Enable Register The Standard Event Status Register supplies various conditions of the Model CYD218 STANDARD EVENT STATUS REGISTER FORMAT 6 5 Weighting 128 64 32 8 E E Bit Name PON NotUsed CME EXE DDE QYE NotUsed OPC Bits 2 and 6 are not used The user will only be interrupted with the reports of this register if the bits have been enabled in the Standard Event Status Enable Register and if bit 5 of the Service Request Enable Register has been set The Standard Event Status Enable Register allows the user to enable any of the Standard Event Status Register reports The Standard Event Status Enable command ESE sets the Standard Event Status Enable Register bits If a bit of this register is set then that function is enabled To set a bit send the command ESE with the bit weighting for each bit you want to be s
43. the line voltage selected 3 2 Installation Omega Model CYD218 Temperature Monitor User s Manual 3 3 1 2 Line Voltage Selection Below is the procedure to change the instrument line voltage selector Verify the fuse value whenever line voltage is changed Identify the line input assembly on the instrument rear panel Turn the line power switch OFF Remove the instrument power cord With a small screwdriver release the drawer holding the line voltage selector and fuse Slide out the removable plastic fuse holder from the drawer Rotate the fuse holder until the proper voltage indicator shows through the window Verify the proper fuse value Re assemble the line input assembly in the reverse order Verify the voltage indicator in the window of the line input assembly 10 Connect the instrument power cord 11 Turn the line power switch ON DONO OP ON 3 3 1 3 Fuse Replacement Below is the procedure to remove and replace a line fuse Use slow blow fuses with the value shown in Table 3 1 To change line input from the factory setting use the appropriate fuse in the connector kit shipped with the instrument 1 Locate line input assembly on the instrument rear Une Cord Power On Off Fuse panel Input Switch Drawer 2 Turn power switch OFF 3 Remove instrument power cord 4 With a small screwdriver release the drawer holding the line voltage selector and fuse 5 Remove fuse and replace it with appropriate slow
44. the sequence appears Edit Curia Use the Data Selection keys to cycle to the input to which the curve applies 1 8 When the desired input appears Curie Entra press Enter The final display in the sequence appears Erase Cura Press Enter to delete the specified curve and return to the Tele at with YT normal display Press Escape to cancel the deletion and ee IA q ele Inet return to the normal display Entry Curie Input i Enter to Sl TO 5 1 6 Viewing Standard Curves View standard curves using the curve entry procedure Standard curves are read only uneditable hd in 1 aD in 5 1 7 Copying Curves Temperature curves can be copied from one location inside the Model CYD218 to another This is a good way to make small changes to an existing curve Curve copy may also be necessary if the user needs the same curve with two different temperature limits or needs to extend the range of a standard curve The curve that is copied from is always preserved NOTE The copy routine allows you to overwrite an existing user curve Please ensure the curve number you are writing to is correct before proceeding with curve copy To copy a curve press the Curve Entry key Press the A or Y key until you see the following display Curve Entry Select With af Cory Curve Press the Enter key You can press the Escape key anytime during this routine to return to the normal display Copying Curves Continued Cur
45. the setting sequence appears Use the number keys to input up to a ten digit serial number then press Enter The fourth display in the setting sequence appears Use the number keys to input the voltage or resistance of the first calibration data point then press Enter Use the number keys to input the temperature in Kelvin that corresponds to the voltage or resistance of the first calibration data point then press Enter Points outside acceptable range will not be allowed If the first point is not used press Enter twice without entering any data The fifth display in the setting sequence appears Use the number keys to input the voltage or resistance of the second calibration data point then press Enter Use the number keys to input the temperature in Kelvin that corresponds to the voltage or resistance of the second calibration data point then press Enter If the second point is not used press Enter twice without entering any data The sixth display in the setting sequence appears Use the number keys to input the voltage or resistance of the third calibration data point then press Enter Use the number keys to input the temperature in Kelvin that corresponds to the voltage or resistance of the third calibration data point then press Enter The Model CYD218 creates and stores the SoftCal curve but users must select the curve for the Gott al Standard Curae Select with A DT 478 ie SUL LA IT Fe ka T ch with
46. 1 for recommended formats for specific sensors The fifth display in the setting sequence appears Use the number keys to input an appropriate upper temperature limit for the installed sensor then press Enter Refer to Table 5 1 for recommended temperature limits for specific sensors The final display in the setting sequence appears Use the number keys to input individual breakpoint pairs of the curve Press Enter both after inputting the sensor units and the temperature After entry of a breakpoint pair the instrument displays a zero breakpoint Enter up to 200 breakpoints To exit the curve entry mode and store the new curve press Enter on a new breakpoint line To enter a zero sensor units value press zero before pressing Enter The curve stores but users must select it for the appropriate input before it is used NOTE Escape returns a single setting to its previous value It cannot return a complete breakpoint or an entire curve to a previous state Use the Data Selection keys to scroll up or down the breakpoint table Only the breakpoint located at the bottom line of the display is active for entry or editing E DO e q IT II Special Features 5 3 Omega Model CYD218 Temperature Monitor User s Manual 5 1 5 Erasing User Curves To erase a user curve press Curve Entry The screen to Curve Entra the right appears Use the Data Selection keys to select Erase Curve then Select with AS press Enter The second display in
47. 2 SA O SeeeeEE 3 3 3 3 3 Terminal Block Model CYD218S ONLY 3 6 3 3 3 1 Relays Model CYD218S ONLY a ea 3 6 3 3 3 2 Analog Outputs Model CYD218S ON vn 3 6 3 3 4 Computer Interfaces eerror a na aaee REENA AEN ONAA AREE Ea 3 6 Table of Contents Omega Model CYD218 Temperature Monitor User s Manual TABLE OF CONTENTS Continued Chapter Paragraph Title Page A O seocensvesavioceca vistseeddeseerse 4 1 4 0 GENERA iii At A sb eles sete titan cade ead Ada 4 1 4 1 DISPLAY SCREEN DESCRIPTION ccccssccceessececesesseeeceesaeeeeecaeeeesesssecseeseeceeesneeeseaaes 4 1 4 2 KEYPAD DESCRIPTION eeh Bier ease geleet Aia 4 2 4 2 1 General Keypad Operation ccccccscecsssescsseeseesecenecseeseccsseeeeeecneecseeeeeeesceesancaeesaeeneeeaeeas 4 3 4 3 TURNING POWER ON EE 4 3 4 4 DISPLAY SETUP gt e caus e a O a a 4 3 4 5 INPUT WY d 4 4 4 5 1 Optimizing the Update Hate crono nono ncnnn cn connnns 4 5 4 6 CURVE SELECT a its geed 4 5 4 7 MATA AS a a a a aa 4 6 4 7 1 Maxi EE 4 6 4 7 2 LN A A a hice edad ATU aba eee veges 4 7 4 7 3 ld a ode 4 7 4 8 ANALOG OUTPUTS MODEL CYD218S ON 4 8 4 8 1 Example of Low and High Analog Parameter Setting s seisieeeeeioieersoriserrnrreresrerreree 4 9 49 ALARMS SETUP AND OPERATION 4 9 4 10 ALARMRESE Tin te dodo 4 11 4 11 RELAY SETUP MODEL CYD218S ON 4 11 4 12 LOCKING THE KEYPAD 000 acid 4 12 4 13 RESETTING MODEL CYD218 TODEFALUUTS nes 4 12 5 SPECIAL EE 5 1 5 0 GENERAL oia a 5 1
48. 7 9 Omega Model CYD218 Temperature Monitor User s Manual 7 12 5 Zero Calibration PURPOSE CONFIG PROCESS To determine the zero offset of the input stage and provide an offset constant back to the Model CYD218 Same as Paragraph 7 12 4 above except that only the 3 input of the group is enabled All other inputs of the group are disabled Via the interface obtain the RAWAD reading of the 3 input To obtain the zero offset constant determine the inverse of the value read Write this number down The inverse of the value read is provided back to the Model CYD218 using the ZCAL command and should be sent as the ZCAL constant to all inputs of the group for the 2 5 V range The input group should then be configured for the 7 5 V range and the process repeated Continue changing ranges and repeating the above process until ZCAL constants have been supplied for all input ranges The ranges should be zero calibrated in the following order 2 5V 7 5V 250 Q 500 Q 5 kQ and 7 5kQ Once zero offset constants for all ranges have been determined and provided back to the Model CYD218 the CALSAVE command is issued to save the constants in the E prom 7 12 6 2 5 Volt Input Gain Calibration PURPOSE CONFIG PROCESS To determine the input gain errors when the input is configured for the 2 5 V input and provide gain calibration constants back to the Model CYD218 Same as Paragraph 7 12 4 above Via the interface obtain the RAWAD
49. 7056 3017 FAX 49 0 7056 8540 Toll Free in Germany 0800 TC OMEGA e mail germany omega com One Omega Drive River Bend Technology Centre Northbank Irlam Manchester M44 5EX United Kingdom TEL 44 0 161 777 6611 FAX 44 0 161 777 6622 Toll Free in United Kingdom 0800 488 488 e mail sales omega co uk it is the policy of OMEGA to comply with all worldwide safety and EMC EMI regulations that apply OMEGA s constantly pursuing certification of its products to the European New Approach Directives OMEGA will add the CE mark to every appropriate device upon certification The information contained in this document is believed to be correct but OMEGA Engineering Inc accepts no liability for any errors it contains and reserves the right to alter specifications without notice WARNING These products are not designed for use in and should not be used for patient connected applications Where Do I Find Everything Need for Process Measurement and Control OMEGA Of Course TEMPERATURE Y Thermocouple RTD amp Thermistor Probes Connectors Panels amp Assemblies E Wire Thermocouple RTD amp Thermistor i Calibrators amp Ice Point References EY Recorders Controllers amp Process Monitors Y Infrared Pyrometers PRESSURE STRAIN AND FORCE i Transducers amp Strain Gages Y Load Cells amp Pressure Gages EF Displacement Transducers Y Instrumentation e Accessories FLOW LEVEL bt Rotameters Gas Mass
50. 75K Typical 2 Point Accuracy 1 0K 2 K to lt 30 K 1 of Temp 0 25K 30K to lt 60 K 3 205K 210K 220K 0 15K 60 K to lt 345 K 4 05K 1 ofTemp 0 25K 345K to lt 375 K 44 0K 375K to475K Temperatures down to 1 4 K only Typical 3 Point Accuracy with Precision Calibrated Sensors 0 5 K 2K to lt 30 K To increase accuracy Perform a 0 25K 30Kto lt 60 K SoftCal with the controller and 0 15 K 60Kto lt 345 K sensor After sensor calibration the 0 25 K 345 K to lt 375K custom curve for that sensor 1 0 K 375 K to 475 K replaces Standard Curve 10 Enter the voltage at 2 or 3 data points SoftCal capable instrument A calibration report ships with the sensor Figure 2 1 Silicon Diode Sensor Calibrations and CalCurve 2 3 2 Sensor Location Positioning a sensor is less problematic if the entire load and sample holder are at the same temperature Unfortunately this not the case in many systems Temperature gradients differences in temperature exist because there is seldom perfect balance between the cooling source and heat sources Even in a well controlled system unwanted heat sources like thermal radiation and heat conduction through mounting structures can cause gradients For best accuracy position sensors near the sample so that little or no heat flows between the sample and sensor 2 3 3 Thermal Conductivity Thermal conductivity is the ability of heat to flow through a material Copper and aluminum have good ther
51. A ut 1 ht Y Gott al Serial Humber SoftCal Input 1 Point 1 Za EXEZ 22 SoftCal Input 1 Point a 1 12 AZ Gott al Ineut 1 Point 3 4 5461 ale Luar at io FI q LABAK appropriate input before it is used If the third point is not used press Enter twice without entering any data Press Escape at anytime to cancel the SoftCal creation sequence and return to the normal display Special Features 5 7 Omega Model CYD218 Temperature Monitor User s Manual 5 3 DATA LOGGING The Model CYD218 has internal memory reserved for data logging Reading Table 5 2 Storage Capability data can be stored in the instrument to be printed or read over computer Based on Readings per Record interface at a later time Data log setup parameters can also be used to control printer operation Active data logging and active printing cannot occur at the same time Data is taken in groups called records Up to eight readings can be logged or printed as one record Readings can be from any input and any source Each record includes a time stamp The Model CYD218 dedicates 12 Kbytes of memory to data logging Table 5 2 indicates the maximum number of records that can be stored based on the number of readings in a record 5 3 1 Log Setup NOTE Changing Log Setup will erase stored records To setup the data log function press Log Setup The first screen in the setting sequence appears Use the Data Selection keys to cycle thr
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53. Flowmeters amp Flow Computers 4 Air Velocity Indicators EY Turbine Paddlewheel Systems 4 Totalizers amp Batch Controllers pH CONDUCTIVITY 4 pH Electrodes Testers amp Accessories 4 Benchtop Laboratory Meters Y Controllers Calibrators Simulators amp Pumps KE Industrial pH amp Conductivity Equipment DATA ACQUISITION i Data Acquisition amp Engineering Software E Communications Based Acquisition Systems K Plug in Cards for Apple IBM amp Compatibles UY Datalogging Systems Y Recorders Printers amp Plotters HEATERS Y Heating Cable Y Cartridge amp Strip Heaters Immersion amp Band Heaters If Flexible Heaters If Laboratory Heaters ENVIRONMENTAL MONITORING AND CONTROL UY Metering amp Control Instrumentation i Refractometers JE Pumps amp Tubing Y Air Soil amp Water Monitors i Industrial Water amp Wastewater Treatment pH Conductivity amp Dissolved Oxygen Instruments M3498 2001
54. GaAlAs Diode 4 Platinum 1000 2 Platinum 100 250 Q 5 NTC Resistor lt value gt Zero Calibration Constant ZCAL Returns Value of Zero Calibration Constant for the Selected Input Input ZCAL lt input gt lt value gt Returned Returns value of zero calibration constant for the selected input and input configuration Remarks lt input gt Specifies which input to query zero calibration constant for Valid entries are 1 8 lt type gt Specifies the input groups sensor type Valid entries are 0 Silicon Diode 3 Platinum 100 500 Q 1 GaAlAs Diode 4 Platinum 1000 2 Platinum 100 250 2 5 NTC Resistor GCAL Provides the Gain Calibration Constant for each Input Input GCAL lt input gt lt type gt lt value gt Returned Nothing Remarks Provides the gain calibration constant for the selected input The calibration constant is calculated using the raw A D data and is multiplied by the necessary constant to supply the corrected value for the input type lt input gt Specifies which input to provide zero calibration constant for Valid entries are 1 8 lt type gt Specifies the input groups sensor type Valid entries are 0 Silicon Diode 3 Platinum 100 500 Q 1 GaAlAs Diode 4 Platinum 1000 2 Platinum 100 250 Q 5 NTC Resistor lt value gt Gain Calibration Constant hemm SSS ee eee Service Omega Model CYD218 Temperature Monitor User s Manual GCAL Returns the Gain Calibration Constant for the S
55. LE OF CONTENTS Continued Chapter Paragraph Title Page 6 RREMOTE OPERA TION inci ees EEN deed 6 1 6 0 GENERAL sonia Ee EEN 6 1 6 1 IEEE 488 INTERFACE iii da 6 1 6 1 1 IEEE 488 Interface Settings ooooonoconnonicnicninonoccconooncononononnnar ono cnnnonrnconcnnonn non con anno nnnnnnnnos 6 1 6 1 2 IEEE 488 Command Structure cccccccssssssecssscssscssscssecssssseeseseesesesesesesssssesseesneseeseness 6 2 6 1 3 Status Register acti diia 6 3 6 1 4 Example IEEE Setup and Program cccccccccsccsscssscesscesseessceeeeesesesseccssesseseseesssesseeeneees 6 4 6 1 5 Notes On Using the IEEE Interface 6 5 6 2 SERIAL INTERFACE neoini aa ali 6 7 6 2 1 Physical Connection ainena ni a a aai Ta a aada iaeo sanii e ii 6 7 6 2 2 EA 6 7 6 2 3 Character Format il ave aed Ae ee ee eu uerge 6 8 6 2 4 E SUIS iia iia cai 6 8 6 2 5 Message Flow Control 6 9 6 2 6 Changing Baud Rato coca lila EE SES 6 9 6 2 7 Serial Interface Basic Programs cccescessessssssssseeccseeeecesecseeeesesscsessecssessesaeersensenaees 6 10 6 2 7 1 Visual Basic Serial Interface Basic Program Setup ooooonnccnnccnoconinccionacanananoronaconacnas 6 10 6 2 7 2 Quick Basic Serial Interface Basic Program Setup 6 13 6 2 7 3 SS EE 6 14 6 2 8 TROUDIESHOOLING EE 6 15 6 3 EEE 488 SERIAL INTERFACE COMMANDS 6 15 E A A A es ageaawecs 7 1 7 0 GENERAL aa oo tits 7 1 7 1 GENERAL MAINTENANCE PRECAUT IONS s s sssssnsasnsnsansinisnsisirienerere
56. ONFIG SYS must call GPIB COM created by IBCONF EXE prior to running Basic There must be QBIB QBL library in the QuickBasic Directory and QuickBasic must start with a link to it All instrument settings are assumed to be defaults Address 12 Terminators lt CR gt lt LF gt and EOI active To use type an instrument command or query at the prompt The computer transmits to the instrument and displays any response If no query is sent the instrument responds to the last query received Type EXIT to exit the program REM INCLUDE c gpib pc qbasic qbdecl bas CLS PRINT IEEE 488 COMMUNICATION PROGRAM PRINT CALL IBFIND dev12 DEV12 TERM CHR 13 CHR 10 INS SPACES 2000 LINE INPUT ENTER COMMAND or EXIT CMDS CMD UCASES CMD IF CMD EXIT THEN END CNDS CNDS TERMS CALL IBWRT DEV12 CMD CALL IBRD DEV12 INS ENDTEST INSTR INS CHR 13 IF ENDTEST gt 0 THEN INS MIDS IN 1 ENDTEST 1 PRINT RESPONSB INS ELSE PRINT NO RESPONSE END IF GOTO LOOP2 Link to IEEE calls Clear screen Open communication at address 12 Terminators are lt CR gt lt LF gt Clear for return string Get command from keyboard Change input to upper case Get out on Exit Send command to instrument Get data back each time Test for returned string String is present if lt CR gt is seen Strip off terminators Print return string No string present if timeout Get nex
57. SS TERMS 1 Strip off terminators PRINT RESPONSE RSS Print response to query ELSE PRINT NO RESPONSE No response to query END IF END IF Get next command GOTO LOOP1 Remote Operation 6 13 Omega Model CYD218 Temperature Monitor User s Manual 6 2 7 3 Program Operation Once either program is running try the following commands and observe the response of the instrument Input from the user is shown in bold and terminators are added by the program The word term indicates the required terminators included with the response ENTER COMMAND KRDG 1 Query Kelvin Reading for Input 1 Monitor will return a temperature reading in Kelvin RESPONSE 77 350 term ENTER COMMAND AOUT 1 Query Analog Output for data output 1 Monitor will retum output reading in percent RESPONSE 10 122 term ENTER COMMAND DISPFLD 3 1 3 Configures display field 3 to display input 1 in sensor units ENTER COMMAND FILTER 5 Query filter parameters for input 5 Monitor returns filter settings RESPONSE 1 08 08 term ENTER COMMAND INCRV 7 2 INCRV 7 Combination command Selects curve 2 for input 7 and then requests input 7 curve number RESPONSE 02 term The following are additional notes on using either Serial Interface program 6 14 If you enter a correctly spelled query without a nothing will be returned Incorrectly spelled commands and queries are ignored Commands and queries and should have a space separa
58. Sif SI nas new data is logged Select with A Continue Log On command continues data logging and 1 adds new records to existing data The fourth display in the setting sequence appears Use the number keys to input the period in seconds 1 to 3600 between data log records then press Enter Ten second minimum if logging operates in print mode NOTE Continuous polling of the instrument over the computer interface can affect the log period 5 8 Special Features Omega Model CYD218 Temperature Monitor User s Manual The fifth display in the setting sequence appears Use the Data Selection keys to select the number of readings per record 1 8 The sixth display in the setting sequence appears Use the Data Selection keys to specify the input from which to take readings 1 8 When the desired input appears press Enter The next display in the setting sequence appears Use the Data Selection keys to select the appropriate source for the selected sensor input K Kelvin temperature reading from input Cc Celsius temperature reading from input Sensor Sensor units reading from input Linear Linear equation data from input Press Enter when the desired source appears The number of source selection screens that follow depends on the number of readings selected The eighth display in the setting sequence appears Use the Lod Setur Location 1 Select with A Ineut 1 i Lod Setur Location 1 Select with af
59. T Query Analog Output Data Input AOUT lt output gt Returned lt analog output gt Format nn nnn term Remarks Returns the percentage of output lt output gt specifies analog output to query BAUD Configure Serial Interface Baud Rate Input BAUD lt bps gt Returned Nothing Remarks Configures to serial interface baud rate lt bps gt specifies bits per second bps rate 0 300 4 1200 2 9600 BAUD Query Serial Interface Baud Rate Input BAUD Returned lt bps gt Format n term Remarks Returns serial interface baud rate See BAUD command for parameter descriptions Remote Operation Omega Model CYD218 Temperature Monitor User s Manual CRDG Query Celsius Reading for a single Input or All Inputs Input CRDG lt input gt Returned Celsius value gt Format nn nnn term Or if all inputs are queried lt input 1 Celsius Value gt lt Input 2 Celsius Value gt lt Input 3 Celsius Value gt lt Input 4 Celsius Value gt lt Input 5 Celsius Value gt lt Input 6 Celsius Value gt lt Input 7 Celsius Value gt lt Input 8 Celsius Value gt Format nn nnn nn nnn nn nann nn nnn t nn nnn nn nnn nn nnn nn nnn Remarks Returns the Celsius reading for a single input or all inputs lt input gt specifies which input s to query 0 all inputs 1 8 individual input NOTE Use 0 all inputs when reading two or more inputs at the maximum update of 16 rdgs sec CRVDEL
60. Typical Pin Configuration for Serial Ports on the Model CYD218 Computers and Serial Printers Model CYD218 Computers and Printers 218 DE 9P DB 25P Description No Connection NC Receive Data RD in Transmit Data TD out Data Terminal Ready DTR out Ground GND Data Set Ready DSR in Data Terminal Ready DTR out tied to 4 No Connection NC No Connection NC Description DCD in RD in TD out DTR out GN DSR in RTS out CTS in Ring in in N 7 o 7 9 TOP OF ENCLOSURE REMOVE AND REPLACE PROCEDURE WARNING To avoid potentially lethal shocks turn off controller and disconnect it from AC power line before performing this procedure Only qualified personnel should perform this procedure REMOVAL Set power switch to Off O and disconnect power cord from rear of unit If attached remove 19 inch rack mounting brackets Use 5 64 hex key to remove four screws attaching top panel to unit Use 5 64 hex key to loosen four screws attaching bottom panel to unit Carefully remove the back bezel by sliding it straight back away from the unit Slide the top panel back and remove it from the unit INSTALLATION Slide the top panel forward in the track provided on each side of the unit Carefully replace the back bezel by sliding it straight into the unit Use 5 64 hex key to install four screws attaching top panel to unit Use 5 64 hex key to tighten four screws attaching bottom panel to unit
61. Use the Data Selection keys to cycle through the relays 1 8 Press Enter when the desired relay appears The second display in the setting sequence appears Use the Data Selection keys to cycle through the relay modes There are three relay modes Alarms Relay tied to alarm operation Off Relay manually set to the normal state Fe On Relay manually set to the active state Ra When the desired mode appears press Enter Select On or Off to manually set the relay state and return to the normal display Select Alarm to tie the relay to an alarm r L Li The third display in the setting sequence appears Use the Data Selection keys to cycle the sensor inputs 1 8 to which the relay applies Press Enter when the desired input appears E E F F t with A fee D gt gu Ge EA Tl JE The fourth display in the setting sequence appears Use the Data Selection keys to cycle through alarms There are three alarms _ Low Relay active only when low alarm is active Re High Relay active only when high alarm is active ke Both Relay active when high or low alarm is active Sa Press Enter when the desired alarm appears The normal Lo display appears Press Escape at any time to return to the normal display The instrument retains values changed prior to pressing Escape Operation 4 11 Omega Model CYD218 Temperature Monitor User s Manual 4 12 LOCKING THE KEYPAD The Model CYD218 keypad lock feature
62. WARRANTY DISCLAIMER language and additionally purchaser will indemnify OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the Product s in such a manner g See RETURN REQUESTS INQUIRIES a Direct all warranty and repair requests inquiries to the OMEGA Customer Service Department BEFORE RETURNING ANY PRODUCT S TO OMEGA PURCHASER MUST OBTAIN AN AUTHORIZED RETURN AR NUMBER FROM OMEGA S CUSTOMER SERVICE DEPARTMENT IN ORDER TO AVOID PROCESSING DELAYS The assigned AR number should then be marked on the outside of the return package and on any correspondence The purchaser is responsible for shipping charges freight insurance and proper packaging to prevent breakage in transit FOR WARRANTY RETURNS please have the FOR NON WARRANTY REPAIRS consult OMEGA following information available BEFORE for current repair charges Have the following contacting OMEGA information available BEFORE contacting OMEGA 1 Purchase Order number under which the product 1 Purchase Order number to cover the COST was PURCHASED of the repair 2 Model and serial number of the product under 2 Model and serial number of the product and warranty and 3 Repair instructions and or specific problems 3 Repair instructions and or specific problems relative to the product relative to the product OMEGA s policy is to make running changes not model changes whenever an improvement is possible This affords our
63. YD218 performs the functions of TALKER and LISTENER but cannot be a BUS CONTROLLER The BUS CONTROLLER is the digital computer which tells the Model CYD218 which functions to perform Below are Model CYD218 IEEE 488 interface capabilities SH1 Source handshake capability RL1 Complete remote local capability DC1 Full device clear capability DTO No device trigger capability e CO No system controller capability e T5 Basic TALKER serial poll capability talk only unaddressed to talk if addressed to listen e La Basic LISTENER unaddressed to listen if addressed to talk SR1 Service request capability AH1 Acceptor handshake capability PPO No parallel poll capability e El Open collector electronics 6 1 1 IEEE 488 Interface Settings If using the EEE 488 interface you must set the IEEE Address and Terminators Press the Interface key The first screen selects Serial Interface Baud Rate and therefore is skipped by pressing the Enter key The Address screen is then displayed Press the A or Y keys to increment or decrement the IEEE Address to the desired number Press Enter to accept new number or Escape to retain the existing number Pressing Enter displays the Terminators screen Remote Operation 6 1 Omega Model CYD218 Temperature Monitor User s Manual EEE 488 Interface Settings Continued Press the A or Y keys to cycle through the following Terminator choices CR LF LF CR LF and EOI To a
64. actly the same voltage This knowledge improves SoftCal operation by roviding an extra 0 25 50 75 100 125 150 175 200 225 250 275 300 325 350 rier ke data point It also ee BAZA EELEE RIN S 2 10K 50 100 K 200 325 K explains why SoftCal calibration specifications are Acceptable Temperature Range for Silicon Diode SoftCal Inputs divided into two temperature Figure 5 1 SoftCal Temperature Ranges for Silicon Diode Sensors ranges above and below 28 K See Figure 5 1 Point 1 Calibration data point at or near the boiling point of helium 4 2 K Temperatures outside 2 K to 10 K are not allowed This data point improves accuracy between the calibration data point and 28K Points 2 and 3 improve temperatures above 28 K Point 2 Calibration data point at or near the boiling point of nitrogen 77 35 K Temperatures outside 50 K to 100 K are not allowed This data point improves accuracy between 28 K and 100 K Points 2 and 3 together improve accuracy to room temperature and above Point 3 Calibration data point near room temperature 305 K Temperatures outside the range of 200 K to 350 K are not allowed Special Features 5 5 Omega Model CYD218 Temperature Monitor User s Manual 5 2 2 SoftCal Accuracy with Silicon Diode Sensors NOTE A SoftCal calibration is only as good as the accuracy of the calibration points The accuracies listed for SoftCal assume 0 05 K for 77 35 K liquid nitrogen and 305 K room temperat
65. an be configured from the front panel or via computer interface and are grouped in two sets of four Each set of four inputs are configured for the same sensor type i e all 100 Q Platinum or all Silicon Diodes etc Sensor Input Reading Capability The Model CYD218 has two high resolution A D converters to increase its update rate It can read sensor inputs more quickly than other scanning monitors because it does not have to wait for current source switching The result is 16 new readings per second allowing all inputs to be read twice each second Inputs can be turned off to obtain a higher reading rate on fewer sensors All readings can be read out of the instrument with the IEEE 488 interface The serial interface can also be used to read all readings if it is operated efficiently The display is updated twice each second Introduction 1 1 Omega Model CYD218 Temperature Monitor User s Manual Features Continued Temperature Response Curves The Model CYD218 has standard temperature sensor response curves for silicon diodes and platinum RTDs It can support a wide variety of temperature sensors that do not have a standard curve because a unique 200 point user curve can be stored for each of the eight inputs User curves can be entered from the front panel or with a computer interface The built in SoftCal algorithm can also be used to generate improved curves for Silicon diodes and platinum RTDs that are stored as user curves Conf
66. anical Refrigerator nnnsennsesenorseosersreririnrerrreesesrerrrsssrens 2 4 Model CYD218 Rear ane geseet ease a As 3 2 POWER FUSO ACCOSS cuidao o oie oc Hagen ae 3 3 Input Connector Pinouts cece ccsecsseessesscecsceseesesesesseseesesssesecsceeaseesesusasesecesseesaeecsescasesaeceatesaeees 3 4 Terminal Block CONMECHOS cccsossssvssscscessnrsccsssenssssssccecssaaccecsssaccccsaucceecssesceecssnsnescesavsscacaesee rss 3 6 Model CYD218 Front Panel 4 1 Model CYD218 Normal Display Screen Format 4 1 Example of Low and High Analog Parameter Setting 0 00n000o0onnonoonerenenorrresresirrorsrrsreseesresrrene 4 9 SoftCal Temperature Ranges for Silicon Diode Gensors 5 5 SoftCal Temperature Ranges for Platinum Sensors oocooicniccncconocinccncccconnccnnncono nono cono nono ranna ranas 5 6 Serial Port lge taa ii ala Ll e RE 5 10 Typical National Instruments GPIB Configuration from IDCONE ENEE 6 6 P wer TEE 7 2 Input Connector Pinouts ovre eton re rten s Erno K enara rreson oren ent 7 3 Terminal Block Connechor 7 3 IEEE 488 Rear Panel Connector cocococccocononocinonaconanoroncnonaranncnnnnon nono naro nono nonan ccoo ancora nino nn na ronanancons 7 4 Serial Port PIMOULS iii a 7 6 Location of Internal Components ccccccceeccesccssecesecesscesscesssesesceeesessseesscseseseseseserssesseenstseseneers 7 8 LIST OF TABLES Title Page Supported Omega Gensors cc ceecccecessscsscescesscesscescccsavcneecesecsaesaae
67. appears Use the number keys to input a low alarm setpoint with the specified source then press Enter Resolution is five digits The sixth display in the setting sequence appears Use the number keys to input a dead band value with the specified source then press Enter Used only with non latching alarm Set to 0 if not used Resolution is five digits The seventh display in the setting sequence appears Use the Data Selection keys to turn alarm latching On or Off then press Enter Latching determines whether the alarm remains active after removing the cause On Alarm active state is latched and remains active until Alarm Reset is pressed Off Alarm active state is not latched and clears when the alarm condition is removed The eighth display in the setting sequence appears Use the Data Selection keys to turn the audible alarm On or Off then press Enter This is a global parameter that controls beeper operation for all input alarms On Beeper sounds for any active alarm on any input Off Beeper will not sound for any active alarm on any input 4 10 Alarm Setur With A Select Ineut 1 Alarm Setur Ineut 1 Select with A Alarm On Alarm Ineut Gel ent Write Ge with AT ensor Alarm Setur Ingut 1 High Alarm Point Alarm Setur Ineut 1 noe Hear Point Alarm Setur Ineut 1 De adband Alarm Setur Ineut 1 Select with A Latchina OFF Seu to with A le Alarm OFF Operation Omega Mo
68. apply during the maintenance phase Keep away from live circuits Installation personnel shall observe all safety regulations at all times Turn off system power before making or breaking electrical connections Regard any exposed connector terminal board or circuit board as a possible shock hazard Discharge charged components only when such grounding results in no equipment damage If a test connection to energized equipment is required make the test equipment ground connection before probing the voltage or signal to be tested Do not install or service equipment alone Do not reach into or enter any enclosure to service or adjust the equipment without another person capable of rendering aid If there is no power verify the power cord is plugged into a live outlet and that both ends are securely plugged in Next check the fuse see Paragraph 3 3 1 1 Clean the Model CYD218 periodically to remove dust grease and other contaminants Use the procedure below 1 Clean front and back panels and case with soft cloth dampened with mild detergent and water solution NOTE Do not use aromatic hydrocarbons or chlorinated solvents to clean the Model CYD218 They may react with the plastic materials used in the controller or the silk screen printing on the back panel 2 Clean surface of printed circuit boards PCBs with clean dry air at low pressure 7 2 ELECTROSTATIC DISCHARGE Electrostatic Discharge ESD may damage electronic parts assem
69. arms R Ohms T Temperature Over or Under Range L Linear S Sensor Over or Under Range Special Features 5 11 Omega Model CYD218 Temperature Monitor User s Manual This Page Intentionally Left Blank Special Features Omega Model CYD218 Temperature Monitor User s Manual CHAPTER 6 REMOTE OPERATION 6 0 GENERAL This chapter provides operational instructions for the computer interface for the Model CYD218 Temperature Monitor Either of the two computer interfaces provided with the Model CYD218 permit remote operation The first is the IEEE 488 Interface described in Paragraph 6 1 The second is the Serial Interface described in Paragraph 6 2 The two interfaces share a common set of commands detailed in Paragraph 6 3 Only one of the interfaces can be used at a time 6 1 IEEE 488 INTERFACE The IEEE 488 Interface is an instrumentation bus with hardware and programming standards that simplify instrument interfacing The Model CYD218 IEEE 488 Interface complies with the IEEE 488 2 1987 standard and incorporates its functional electrical and mechanical specifications unless otherwise specified in this manual All instruments on the interface bus perform one or more of the interface functions of TALKER LISTENER or BUS CONTROLLER A TALKER transmits data onto the bus to other devices A LISTENER receives data from other devices through the bus The BUS CONTROLLER designates to the devices on the bus which function to perform The Model C
70. at 675 K 10 mK at 800 K 10 mK at 800 K Electronic Accuracy Sensor Units Temperature Equivalence 0 06 2 0 04 RDG 40 mK at 30 K 133 mK at 77 K 1135 mK at 300 K 370 mK at 800 K 0 004 0 02 RDG 25 mK at 30 K 18 mK at 77 K 70 mK at 300 K 162 mK at 675 K 187 mK at 800 K 45 mK at 30 K 38 mK at 77 K 105 mK at 300 K 262 mK at 675 K 287 mK at 800 K 1 Recommended for Recommended for Recommended for Magnetic FieidiUse T gt 60K amp B lt 3T T gt 40K amp B lt 25T T gt 40K amp B lt 25T 160 uV 10 01 RDG 11 mK at 4 2K 138 mK at 77 K 88 mK at 300 K 77 mK at 475 K 31 mK at 4 2 K 193 mK at 77 K 138 mK at 300 K 177 mK at 475 K Temperature Accuracy including electronic accuracy CalCurve and calibrated sensor 60 mK at 30 K 53 mK at 77 K 170 mK at 300 K 470 mK at 800 K Introduction 1 3 Omega Model CYD218 Temperature Monitor User s Manual 1 3 SAFETY 1 3 1 Handling Liquid Helium and Liquid Nitrogen Liquid Helium LHe and liquid nitrogen LN2 may be used in conjunction with the Model CYD218 Although LHe and LN are not explosive there are certain safety considerations when handling them 1 3 1 1 Handling Cryogenic Storage Dewars Operate all cryogenic containers dewars in accordance with manufacturer instructions Safety instructions are normally posted on the side of each dewar Keep cryogenic
71. ation port at 9600 Baud Use the following procedure to develop the Serial Interface Program in Quick Basic Start the Basic program Enter the program exactly as presented in Table 6 5 Adjust the Com port and Baud rate in the program as necessary Lengthen the TIMEOUT count if necessary Save the program Run the program Type a command query as described in Paragraph 6 2 7 3 Type EXIT to quit the program ON Oa ko 3 Table 6 5 Quick Basic Serial Interface Program CLS Clear screen PRINT SERIAL COMMUNICATION PROGRAM PRINT TIMEOUT 2000 Read timeout may need more BAUD 9600 TERMS CHR S 13 CHR 10 t Terminators are lt CR gt lt LF gt OPEN COM1 BAUD 0 7 1 RS FOR RANDOM AS 1 LEN 256 LINE INPUT ENTER COMMAND or EXIT CMDS Get command from keyboard CMDS UCASES CMDS Change input to upper case IF CMD EXIT THEN CLOSE 1 END Get out on Exit CMD CMDS TERMS PRINT 1 CNDS Send command to instrument IF INSTR CMD lt gt O THEN Test for query RS If query read response N 0 Clr return string and count WHILE N lt TIMEOUT AND INSTR RS TERMS 0 Wait for response IN INPUT LOC 1 1 Get one character at a time IF INS THEN N N 1 ELSE N 0 Add 1 to timeout if no chr RS RSS INS Add next chr to string WEND Get chrs until terminators IF RS lt gt THEN See if return string is empty RS MIDS RS 1 INSTR R
72. blies and equipment ESD is a transfer of electrostatic charge between bodies at different electrostatic potentials caused by direct contact or induced by an electrostatic field The low energy source that most commonly destroys Electrostatic Discharge Sensitive ESDS devices is the human body which generates and retains static electricity Simply walking across a carpet in low humidity may generate up to 35 000 volts of static electricity Current technology trends toward greater complexity increased packaging density and thinner dielectrics between active elements which results in electronic devices with even more ESD sensitivity Some electronic parts are more ESDS than others ESD levels of only a few hundred volts may damage electronic components such as semiconductors thick and thin film resistors and piezoelectric crystals during testing handling repair or assembly Discharge voltages below 4000 volts cannot be seen felt or heard ee A S N E E EE Service 7 4 Omega Model CYD218 Temperature Monitor User s Manual 7 2 1 Identification of Electrostatic Discharge Sensitive Components Below are various industry symbols used to label components as ESDS SY A CAUTI O 7 2 2 Handling Electrostatic Discharge Sensitive Components Observe all precautions necessary to prevent damage to ESDS components before attempting installation Bring the device and everything that contacts it to ground potential by providing a conductive surface an
73. blow fuse 6 Re assemble line input assembly in reverse order 7 Verify voltage indicator in the line input assembly Se oy 8 Connect instrument power cord 100 120 220 240 V 9 Turn power switch ON e T 3 3 1 4 Power Cord Figure 3 2 Power Fuse Access The Model CYD218 includes a three conductor power cord Line voltage travels across the outer two conductors The center conductor is a safety ground and connects to the instrument metal chassis when the power cord attaches to the power connector For safety plug the cord into an appropriate grounded receptacle 3 3 1 5 Power Switch The power switch turns the instrument ON and OFF and is located in the line input assembly on the instrument rear When I is raised on the switch the instrument is ON when O is raised the instrument is OFF Do not remove instrument covers without first disconnecting the power cord even if the power switch is off 3 3 2 Sensor Inputs This section covers Sensor Input Connector and Pinout in Paragraph 3 3 2 1 Sensor Lead Cable in Paragraph 3 3 2 2 Grounding and Shielding Sensor Leads in Paragraph 3 3 2 3 Sensor Polarity in Paragraph 3 3 2 4 Four Lead Sensor Measurement in Paragraph 3 3 2 5 Two Lead Sensor Measurement in Paragraph 3 3 2 6 and Lowering Measurement Noise in Paragraph 3 3 2 7 a A O A E ee A AA ee I I Installation 3 3 Omega Model CYD218 Temperature Monitor User s Manual 3 3 2 1 Sensor Input Connector and Pinout This paragra
74. c Serial Interface Program Setup The serial interface program Table 6 3 works with Visual Basic 6 0 VB6 on an IBM PC or compatible with a Pentium class processor A Pentium 90 or higher is recommended running Windows 95 or better with a serial interface It uses the COM1 communications port at 9600 Baud Use the following procedure to develop the Serial Interface Program in Visual Basic 1 Start VB6 Choose Standard EXE and select Open Resize form window to desired size On the Project Menu click Components to bring up a list of additional controls available in VB6 Scroll through the controls and select Microsoft Comm Control 6 0 Select OK In the toolbar at the left of the screen the Comm Control will have appeared as a telephone icon Select the Comm control and add it to the form Add controls to form a Add three Label controls to the form b Add two TextBox controls to the form c Add one CommandButton control to the form d Add one Timer control to the form 8 On the View Menu select Properties Window 9 Inthe Properties window use the dropdown list to select between the different controls of the current project Gr POS SE Label1 Commandi m Serial Interface Program Label3 Label2 10 Set the properties of the controls as defined in Table 6 3 11 Save the program 6 10 Remote Operation Omega Model CYD218 Temperature Monitor User s Manual Table 6 3 Serial Interface Program Con
75. ccept changes or the currently displayed setting push Enter To cancel changes push Escape Power down the Model CYD218 then back up again to allow other devices on the IEEE 488 bus to recognize a new Address or Terminator setting 6 1 2 IEEE 488 Command Structure The Model CYD218 supports several command types These commands are divided into three groups 1 Bus Control Refer to Paragraph 6 1 2 1 a Universal 1 Uniline 2 Multiline b Addressed Bus Control 2 Common Refer to Paragraph 6 1 2 2 3 Interface and Device Specific Refer to Paragraph 6 1 2 3 6 1 2 1 Bus Control Commands A Universal Command addresses all devices on the bus Universal Commands include Uniline and Multiline Commands A Uniline Command Message asserts only a single signal line The Model CYD218 recognizes two of these messages from the BUS CONTROLLER Remote REN and Interface Clear IFC The Model CYD218 sends one Uniline Command Service Request SRQ REN Remote Puts the Model CYD218 into remote mode IFC Interface Clear Stops current operation on the bus SRQ Service Request Tells the bus controller that the Model CYD218 needs interface service A Multiline Command asserts a group of signal lines All devices equipped to implement such commands do so simultaneously upon command transmission These commands transmit with the Attention ATN line asserted low The Model CYD218 recognizes two Multiline commands LLO Local
76. ce Data memory Maximum of 1500 single reading records non volatile General Ambient Temperature 15 35 C at rated accuracy 10 40 C at reduced accuracy Power Requirement 100 120 220 240VAC 5 10 50 or 60Hz 18 VA Size 217 mm W x 90 mm H x 317 mm D half rack Weight 3 kilograms 6 6 pounds Approval CE Mark contact Omega Engineering for availability Omega Model CYD218 Temperature Monitor User s Manual Sensor Type Silicon Diode an NO 100012 Platinum RTD Temperature Coemcient Negaive Sensor Units Volts V Ohms Q Ohms Q Input Range 0 2 5V 0 500 Q 0 5000 Q Sensor Excitation Constant Current 10 pA 10 01 1 mA 0 3 1 mA 10 3 Display Resolution Example Sensor VV Se HIT with Era with 14J Cal PT 1001 with 1 4J Cal Temperature Range 1 4 475K 30 800 K 30 800 K Standard Sensor Curve Curve 10 DIN 43760 Scaled from DIN 43670 30 mV K at 4 2 K 0 19 Q K at 30 K 1 9 Q K at 30 K 1 9 mV K at 77 K 0 42 Q K at 77 K 4 2 QUK at 77 K 2 4 mV K at 300 K 0 39 Q K at 300 K 3 9 Q K at 300 K 2 2 mV K at 475 K 0 35 Q K at 675 K 3 3 Q K at 800 K 0 33 Q K at 800 K Typical Sensor Sensitivity Measurement Resolution Sensor Units 20 uV 2mQ 20 mQ Temperature Equivalence 1mKat4 2K 10 6 mK at 30 K 10 6 mK at 30 K 11mKat77 K 10 mK at 77 K 10 mK at 77K 10 mK at 300 K 10 mK at 300 K 10 mK at 300 K 10 mK at 475 K 10 mK
77. ck the 10 V output of the Analog Outputs CONFIG The positive lead of the DVM is connected to the analog output positive terminal the negative lead is connected to the analog output negative terminal The DVM should be set to read DC VOLTS Via the front panel manually set the analog output to 10 V TOLERANCE 22 5 mV PROCESS Check the DVM reading and verify it displays 10 000 0 003 V 7 12 Service Omega Model CYD218 Temperature Monitor User s Manual 7 12 15 CALIBRATION SPECIFIC INTERFACE COMMANDS ADCAL Calibrates A D Linearity Input ADCAL lt input group gt Returned Nothing Remarks Calibrates the A D linearity of the selected input group Before issuing command the input group must be configured as follows A precision 2 5 V attached to input 1 a precision 2 5 V attached to input 2 and a precision ground at input 3 lt input group gt Specifies which group of inputs to calibrate Valid entries are A inputs 1 4 and B inputs 5 8 ZCAL Provides the Zero Calibration Constant for each Input Input ZCAL lt input gt lt type gt lt value gt Returned Nothing Remarks Provides the zero calibration constant for the selected input The calibration constant is calculated using the raw A D data lt input gt Specifies which input to provide zero calibration constant for Valid entries are 1 8 lt type gt Specifies the input groups sensor type Valid entries are 0 Silicon Diode 3 Platinum 100 500 Q 1
78. commodate the various sensors the Model CYD218 supports The input circuitry is not adjusted during calibration Instead precision voltages and resistors are attached to each input and mathematical calibration constants are calculated and programmed into the Model CYD218 to use to compensate for input offset and gain errors Refer to Paragraph 7 12 15 for details on calibration specific interface commands 7 12 1 Required Equipment List 1 PC with software loaded which provides serial command line communication 2 DE 9 to DE 9 cable Pin to pin connections on all 9 pins Female connectors on both ends 3 foot minimum DE 9 null modem adapter DVM with minimum 5 digits resolution Precision reference providing 2 5 0 00001 V and 2 5 0 00001 V Four 200 KQ resistor calibrated to 2 0Q Four 250 Q resistors calibrated to 0 001Q Four 5 KQ resistors calibrated to 0 025Q Eight 100 kQ resistor calibrated to 0 5Q ON Or amp 7 12 2 SENSOR INPUT CALIBRATION SETUP Allow the Model CYD218 to warm up for at least one hour with 100 kQ resistors attached to all eight input Configure both input groups to the 2 5 V Diode range Connect the Model CYD218 to the PC via the serial port Verify operational serial communication by sending the IDN command and receiving the proper response from the Model CYD218 During the calibration process leave four 100 kQ resistors attached to the input group not currently being calibrated Calibrate input gro
79. customers the latest in technology and engineering OMEGA is a registered trademark of OMEGA ENGINEERING INC Copyright 1999 OMEGA ENGINEERING INC All rights reserved This document may not be copied photocopied reproduced translated or reduced to any electronic medium or machine readable form in whole or in part without the prior written consent of OMEGA ENGINEERING INC Omega Model CYD218 Temperature Monitor User s Manual TABLE OF CONTENTS Chapter Paragraph Title Page 1 INTRODUCTION aiii area aut eden guaccececelbacdanwadeadeceSnassscnesdaveadeseasnas 1 1 1 0 GENERAL ui A EE Een 1 1 1 1 ATIRE E ia dE Lao EE 1 1 1 2 Glaesener TEE 1 2 1 3 SAFE EE 1 4 1 3 1 Handling Liquid Helium and Liquid Nitrogen nn cnc rnnnranass 1 4 1 3 2 Safety SUMMA EE 1 5 1 3 3 ME E ue 1 6 2 SENSOR CONSIDERATIONS cccscssscecssssrsessssceeecssccesessseceenessccesensssececeenseaesassssaesnsceneeeesseesesseanes 2 1 2 0 GENERAL 000000 E A A nee ON Raat ln a 2 1 2 1 TEMPERATURE SENSOR GELECTION isssssssseesressesrrssssrressesressnnressnreerserrrssrreseseessreens 2 1 2 1 1 Temperature Range EEN 2 1 2 1 2 Sensor Sensitivity ici iii farias ts 2 1 2 1 3 Environmental Conditions 2 1 2 1 4 Measurement ACCUTACY cocccoococcnoooonoconcnononononcnnnancnnconancncnonno nono nono rr rro PAA E ISESE ENNER 2 1 2 1 5 Sensor Package ivi nda 2 2 2 2 CALIBRATED SENSORS cios liliana lead NEE 2 2 2 2 1 Traditional Calibration iia clas aida 2 2 2 2 2 SOMA
80. cy at different points This is typical sensor response and can be used as a guide to choose a sensor for the Model CYD218 2 1 3 Environmental Conditions Environmental factors such as high vacuum magnetic field corrosive chemicals or even radiation may limit effectiveness of some sensors Magnetic field experiments are very common Field dependence is an important selection criteria for temperature sensors used in these experiments Table 1 2 states the field dependence of most common sensors 2 1 4 Measurement Accuracy Temperature measurements have several sources of error Account for errors induced by both the sensor and the instrumentation when computing accuracy The instrument has measurement error in both reading the sensor signal and calculating a temperature using a temperature response curve Error results from the sensor comparison to a calibration standard the sensor temperature response shifts with time and repeated thermal cycling Instrument and sensor makers specify these errors but some things help maintain good accuracy For example choose a sensor with good sensitivity in the most critical temperature range as sensitivity minimizes the effect of most error sources Install the sensor properly Paragraph 2 3 Recalibrate the sensor and instrument periodically Use a sensor calibration appropriate for the accuracy requirement Sensor Considerations 2 1 Omega Model CYD218 Temperature Monitor User s Manual 2 1 5
81. d Setting resolution is six digits in temperature Enter most breakpoints with 0 001 K resolution Enter temperatures above 1000 K with lower resolution Enter temperatures below 10 K with 0 0001 K resolution increased low temperature resolution can improve the curve accuracy of NTC resistors that have increased sensitivity at low temperatures Enter breakpoints with the sensor units increasing with breakpoint number Leave all unused breakpoints at zero Leave no zero breakpoints in the middle of a user curve they are interpreted as the end of the curve 5 1 3 Editing an Existing Curve Curve editing functions work for existing user curves as well as new curves Enter the curve entry mode as described for a new curve add or erase points as needed then press Enter on the zero breakpoint to exit curve entry mode and save the changes To edit a breakpoint use the Data Selection keys to scroll to the breakpoint input the new value then press Enter H the new breakpoint is out of order the instrument flashes a message similar to the one shown below and moves the breakpoint to the appropriate location Moving Curve Point t m L OC a t 1 OP ee To add a breakpoint to the table use the Data Selection keys to scroll to the end of the curve data and add the new point on the first line displayed as zero If the new breakpoint is out of order the instrument flashes a message similar to the one shown above and moves the breakpoint to the app
82. d discharge paths As a minimum observe these precautions 1 De energize or disconnect all power and signal sources and loads used with unit 2 Place unit on a grounded conductive work surface 3 Ground technician through a conductive wrist strap or other device using 1 MQ series resistor to protect operator 4 Ground any tools such as soldering equipment that will contact unit Contact with operator s hands provides a sufficient ground for tools that are otherwise electrically isolated 5 Place ESDS devices and assemblies removed from a unit on a conductive work surface or in a conductive container An operator inserting or removing a device or assembly from a container must maintain contact with a conductive portion of the container Use only plastic bags approved for storage of ESD material 6 Do not handle ESDS devices unnecessarily or remove from the packages until actually used or tested 7 3 LINE VOLTAGE SELECTION Below is the procedure to change the instrument line voltage selector Verify the fuse value whenever line voltage is changed Identify the line input assembly on the instrument rear panel Turn the line power switch OFF Remove the instrument power cord With a small screwdriver release the drawer holding the line voltage selector and fuse Slide out the removable plastic fuse holder from the drawer Rotate the fuse holder until the proper voltage indicator shows through the window Verify the proper fus
83. del CYD218 Temperature Monitor User s Manual After setting all alarm parameters a list of the previous alarm status of all inputs momentarily displays before returning to the normal display Press Escape at any time to return to the normal display The instrument retains values changed prior to pressing Escape 4 10 ALARM RESET Alarm Reset resets a latched active alarm after the alarm condition has been cleared If the alarm condition is not cleared the alarm activates again during the next sensor Alarm E input update cycle Alarm Reset does not affect a non latching alarm After pressing Alarm Reset the message to the right displays momentarily to confirm the reset 4 11 RELAY SETUP MODEL CYD218S ONLY There are eight relays on the Model CYD218S numbered 1 to 8 They are most commonly thought of as alarm relays but may be manually controlled also Relay assignments are configurable A relay can be used with any input it is not necessary for example to use relay one with input one One relay can be assigned to activate when either alarm from a sensor input is active or two relays can be used with one sensor input for independent high and low operation When using relays with alarm operation set up alarms first Paragraph 4 9 The relays are rated for 30 VDC and 5 A Their terminals are in the detachable terminal block on the Model CYD218S rear panel To begin relay setup press Relay Setup The display to the right appears
84. e Mode Query Reading Status Set Relay Query Relay Query Relay Status Generate SoftCal Curve Query Sensor Units Reading Remote Operation Omega Model CYD218 Temperature Monitor User s Manual IEEE 488 SERIAL INTERFACE COMMANDS ALPHABETICAL LISTING CLS Clear Interface Command Input CLS Returned Nothing Remarks Clears bits in the Status Byte Register and Standard Event Status Register and terminates all pending operations Clears the interface but nof the instrument See RST command ESE Configure Status Reports in the Standard Event Status Register Input ESE lt bit weighting gt Returned Nothing Remarks Each bit is assigned a bit weighting and represents the enable disable status of the corresponding event flag bit in the Standard Event Status Register To enable an event flag bit send the command ESE with the sum of the bit weighting for each desired bit See the ESR command for a list of event flags Example To enable event flags 0 3 4 and 7 send ESE 143 term 143 is the bit weighting sum for each bit Bit Bit Weighting Event Name 0 1 OPC 3 8 DDE 4 16 EXE 7 128 PON 143 ESE Query the Configuration of Status Reports in the Standard Event Status Register Input ESE Returned lt ESE bit weighting gt Format nnn term Remarks The integer retumed represents the sum of the bit weighting of the enable bits in the Standard Event Status Enable Register See the ESR command for a list
85. e because it limits flexibility and can potentially damage sensors Much care should be taken not to over heat or mechanically stress sensor packages Less permanent mountings require some pressure to hold the sensor to its mounting surface Pressure will greatly improve the action of gasket material to increase thermal conductivity and reduce thermal gradients A spring clamp is recommended so that different rates of thermal expansion don t increase or decrease pressure with temperature change To Room Temperature Vacuum Shroud Refrigerator E d Vacuum Space iia Radiation Shield Dental Floss Tie Down or Cryogenic Tape Thermal Anchor Bobbin Refrigerator Second Stage Thermal Anchor Bobbin Cryogenic Wire small diameter large AWG Sensor Cold Stage and Heater Sample Holder wiring not shown for clarity Drawing Not To Scale Optical Window if required Figure 2 2 Typical Sensor Installation in a Mechanical Refrigerator 2 4 Sensor Considerations Omega Model CYD218 Temperature Monitor User s Manual 2 3 6 Lead Wire Different types of sensors come with different types and lengths of electrical leads In general a significant length of lead wire must be added to the sensor for proper heat sinking and connecting to a bulk head connector at the vacuum boundary The lead wire must be a good electrical conductor but a poor thermal conductor or heat will transfer down the leads and change the temp
86. e captured A linear equation can be applied to input data to correct system errors or improve performance of the analog outputs Math features can be performed on all eight sensor inputs Each input must be configured seperately 4 7 4 Max Min The Max Min feature simply captures and stores the highest Max and lowest Min reading taken since the last reset The feature will only capture from one reading source so it is important to select a source Max and min can be manually reset as described below They are also reset when the instrument is turned off or parameters related to the input are changed Math Setur Fress Math Button ei Masi for Math Getup To select a source for Max Min press Math The display to the right appears Press Enter to select an input for Max Min The second display in the Math setting sequence appears Use the Data Selection keys to select the sensor input 1 8 from which to capture and store the highest Max and lowest Min reading Press Enter when the desired input appears The third display in the Math setting sequence appears Use the Data Selection keys to select the appropriate with A source for the selected sensor input e Si G K Kelvin temperature reading from input tin Units F e Celsius temperature reading from input Sensor Sensor units reading from input Linear Linear equation data from input Press Enter when the desired source appears Press Escape at any time to r
87. e line voltage Table 3 1 AC Line Input Definitions selector line fuse holder and power cord i connector It is important to verify that the Model Indicator Line Voltage Range Fuse slow blow CYD218 is set to the appropriate line voltage and 100 90 106 VAC 0 25 A 250 V has the correct line fuse before it is powered on for 108 127 VAC 0 25A 250W the first time See Table 3 1 If the final destination A Seier factory configures the line input Check this 240 216 254 VAC 0 125 A 250 configuration it is not unusual for an instrument to ae aa 2 of the instrument is known when it ships the change hands before it reaches the end user All line voltages discussed are single phase 3 3 1 1 Line Voltage and Fuse Verification To verify proper line voltage selection look at the indicator in the line input assembly window If line voltage is not in the range shown in Table 3 1 for that indicator change it as described in Paragraph 3 3 1 2 Remove fuse to verify its value see Paragraph 3 3 1 3 for fuse replacement Use slow blow fuses of the value specified in Table 3 1 Fuse values are also printed on the rear panel of the instrument for convenience WARNING To avoid potentially lethal shocks turn off controller and disconnect it from AC power line before performing these procedures CAUTION For continued protection against fire hazard replace only with the same type and rating of fuse as specified for the line for
88. e that no other communication is started during the response or for 50 ms after it completes e Not initiate communication more than 20 times per second Failure to follow these simple rules will result in inability to establish communication with the instrument or intermittent failures in communication 6 2 6 Changing Baud Rate To use the Serial Interface you must first set the Baud rate Press Interface key to display the following screen E it q T m1 Press the A or W keys to cycle through the choices of 300 1200 or 9600 Baud Press Enter to accept the new number Remote Operation 6 9 Omega Model CYD218 Temperature Monitor User s Manual 6 2 7 Serial Interface Basic Programs Two BASIC programs are included to illustrate the serial communication functions of the instrument The first program was written in Visual Basic Refer to Paragraph 6 2 7 1 for instructions on how to setup the program The Visual Basic code is provided in Table 6 4 The second program was written in Quick Basic Refer to Paragraph 6 2 7 2 for instructions on how to setup the program The Quick Basic code is provided in Table 6 5 Finally a description of operation common to both programs is provided in Paragraph 6 2 7 3 While the hardware and software required to produce and implement these programs not included with the instrument the concepts illustrated apply to almost any application where these tools are available 6 2 7 1 Visual Basi
89. e value Re assemble the line input assembly i in the reverse order Verify the voltage indicator in the window of the line input assembly 10 Connect the instrument power cord 11 Turn the line power switch ON 2230 Or oa 7 4 FUSE REPLACEMENT Below is the procedure to remove and replace a line fuse Use slow blow fuses with the value shown in Table 3 1 To change line input from the factory setting use the appropriate fuse in the connector kit shipped with the instrument Locate line input assembly on the instrument rear panel Line Cord Power Switch Screwdriver Fuse Turn power switch OFF E GE Shot Drawer Remove instrument power cord With a small screwdriver release the drawer holding the line voltage selector and fuse Remove fuse and replace it with appropriate slow blow fuse Re assemble line input assembly in reverse order Verify voltage indicator in the line input assembly window Connect instrument power cord i Turn power switch ON Figure 7 1 Power Fuse Access SSA AUN 72 Service Omega Model CYD218 Temperature Monitor User s Manual 7 5 SENSOR INPUT CONNECTOR AND PINOUT Figure 7 2 Input Connector Pinouts S Shield NC No Connect 7 6 TERMINAL BLOCK Model CYD218S ONLY ANALOG OUTPUTS RELAY4 1 RELAYS 30 VDC 5A RELAY1 RELAY2 RELAY 3 RSERSEESERSEES HERE dd e TTT RELAY 5 RELAY6 RELAY RELAY8 2 Figure 7 3 Terminal Block Connectors Table 7 1 Te
90. ect current power line Equipment protected throughout by e double insulation or reinforced Alfematng cuen power line insulation equivalent to Class II of Alternating or direct current power line IEC 536 see Annex H Three phase alternating current power line A n SE Wee ae of electric shock Background color Earth ground terminal Yellow Symbol and outline Black Caution or Warning See Protective conductor terminal A instrument documentation Frame or chassis terminal Background color Yellow Symbol and outline Black On supply Fuse Off supply O O A l km 1 6 Introduction Omega Model CYD218 Temperature Monitor User s Manual CHAPTER 2 SENSOR CONSIDERATIONS 2 0 GENERAL Selecting the proper sensor is vital to good temperature monitoring This chapter covers Temperature Sensor Selection in Paragraph 2 1 Calibrated Sensors in Paragraph 2 2 and Sensor Installation in Paragraph 2 3 This chapter describes cryogenic applications but many ideas apply to other temperature measurements 2 1 TEMPERATURE SENSOR SELECTION This section covers general information about sensor selection Find additional information on temperature sensor characteristics and selection in the Omega Temperature Catalog 2 1 1 Temperature Range The experimental temperature range must be known when choosing a sensor Some sensors can be damaged by temperatures that are too high or too low Manufactures recomm
91. ed in any location Sensor readings can be displayed in temperature or sensor units Results of the math feature can be displayed at the same time as live readings The reading location indicates the number of the sensor input to the left of the reading value The character to the right of the reading value indicates units for live readings or shows an annunciator for one of the math values The column of characters on the far right side of the display are used for system annunciators See Figure 4 2 During keypad operation display format changes to prompt for data entry Source Annunciators Other Displays K Sensor input data in Kelvin blank Display location off Cc Sensor input data in Celsius DISABLED Input for this location disabled VorfA Sensor input data in sensor units ALM HIGH High alarm triggered for input at this location gt Result of maximum hold function ALM LOW Low alarm triggered for input at this location lt Result of minimum hold function NO CURVE No curve selected for input at this location Result of linear equation output T OVER Temperature over curve capability T UNDER Temperature under curve capability System Annunciators S OVER Voltage or resistance over input capability R Remote IEEE 488 operation S UNDER Voltage or resistance under input capability A Alarm Enabled D Data Log Enabled 4 2 KEYPAD DESCRIPTION The Model CYD218 has a 4 row by 5 column sealed membrane keypad Keys are used for both beginning a set
92. ed to offer suggestions on the use of its various products However OMEGA neither assumes responsibility for any omissions or errors nor assumes liability for any damages that result from the use of its products in accordance with information provided by OMEGA either verbal or written OMEGA warrants only that the parts manufactured by it will be as specified and free of defects OMEGA MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND WHATSOEVER EXPRESS OR IMPLIED EXCEPT THAT OF TITLE AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED LIMITATION OF LIABILITY The remedies of purchaser set forth herein are exclusive and the total liability of OMEGA with respect to this order whether based on contract warranty negligence indemnification strict liability or otherwise shall not exceed the purchase price of the component upon which liability is based In no event shall OMEGA be liable for consequential incidental or special damages CONDITIONS Equipment sold by OMEGA is not intended to be used nor shall it be used 1 as a Basic Component under 10 CFR 21 NRC used in or with any nuclear installation or activity or 2 in medical applications or used on humans Should any Product s be used in or with any nuclear installation or activity medical application used on humans or misused in any way OMEGA assumes no responsibility as set forth in our basic
93. elected Input Input GCAL lt input gt lt type gt Returned Value of gain calibration constant for the selected input Remarks See GCAL command for description of returned data lt input gt Specifies which input to query gain calibration constant for Valid entries are 1 8 lt type gt Specifies the input groups sensor type Valid entries are 0 Silicon Diode 3 Platinum 100 500 Q 1 GaAlAs Diode 4 Platinum 1000 2 Platinum 100 250 Q 5 NTC Resistor RAWAD Querys Raw A D Value for the Selected Input Input RAWAD lt input gt Returned Raw A D value Format n nnnnnn term Remarks Returns 7 digit value of selected input reading Used for ZCAL and GCAL functions lt input gt Specifies which input to query Valid entries are 1 8 CALCLEAR Returns All Calibration Constants to Their Default Value Input CALCLEAR Returned Nothing Remarks Returns all A D Linearity ZCAL and GCAL calibration constants to their default value CALSAVE Saves all Calibration Constants Input CALSAVE Retugned Nothing Remarks Saves all A D Linearity ZCAL and GCAL calibration constants 7 14 Service Omega Model CYD218 Temperature Monitor User s Manual CHAPTER 8 ACCESSORIES Description Of Model CYD218 Accessories CYD218S Standard Temperature Monitor Includes 8 inputs IEEE 488 and serial interface alarms relays analog output data logging and printer support Standard Temperature Monitor I
94. endations should always be followed Sensor sensitivity is also dependent on temperature and can limit a sensors useful range It is important not to specify a range larger than necessary If an experiment is being done at liquid helium temperature and a very high sensitivity is needed for good measurement resolution that same resolution may not be required to monitor warm up to room temperature Two different sensors may be required to tightly cover the range from helium to room temperature but lowering the requirement on warm up may allow a less expensive one sensor solution Another thing to consider when choosing a temperature sensor is that instruments like the Model CYD218 are not able to read some sensors over their entire temperature range The Model CYD218 is limited to operation above 1 K in its standard configuration 2 1 2 Sensor Sensitivity Temperature sensor sensitivity measures how much a sensor signal changes when the temperature changes It is important because so many measurement parameters relate to it Resolution accuracy and noise floor depend on sensitivity Many sensors have different sensitivities at different temperatures For example platinum sensor sensitivity is good at higher temperatures but drops sharply below 30 Kelvin K It may be difficult to determine if a sensor has adequate sensitivity over the experimental temperature range Table 1 2 lists sensor sensitivity translated into temperature resolution and accura
95. erature reading of the sensor Small 30 to 40 AWG wire made of an alloy like phosphor bronze is much better than copper wire Thin wire insulation is preferred and twisted wire should be used to reduce the effect of RF noise if it is present The wire used on the room temperature side of the vacuum boundary is not critical so copper cable is normally used 2 3 7 Lead Soldering When additional wire is soldered to short sensor leads care must be taken not to overheat the sensor A heat sink such as a metal wire clamp or alligator clip will heat sink the leads and protect the sensor Leads should be tinned before bonding to reduce the time that heat is applied to the sensor lead Solder flux should be cleaned after soldering to prevent corrosion 2 3 8 Heat Sinking Leads Sensor leads can be a significant source of error if they are not properly heat sinked Heat will transfer down even small leads and alter the sensor reading The goal of heat sinking is to cool the leads to a temperature as close to the sensor as possible This can be accomplished by putting a significant length of lead wire in thermal contact with every cooled surface between room temperature and the sensor Lead wires can be adhered to cold surfaces with varnish over a thin electrical insulator like cigarette paper They can also be wound onto a bobbin that is firmly attached to the cold surface Some sensor packages include a heat sink bobbin and wrapped lead wires to simplify heat s
96. esesesesersrnrsrenrerersre 7 1 7 2 ELECTROSTATIC DISCHARGE EE Eegeregie ease 7 1 7 2 1 Identification of Electrostatic Discharge Sensitive Components a se 7 2 7 2 2 Handling Electrostatic Discharge Sensitive Components e eissnseeeesesieeerereresesrerern 7 2 7 3 LINE VOLTAGE SELECTION sata idad 7 2 7 4 FUSE REPLACEMENT euer Sages dicots dictarse delia ic AER 7 2 7 5 SENSOR INPUT CONNECTOR AND PINOUT cccccoccococcoccocoonornncononnncononnnonconncnnncnnonoranorinnos 7 3 7 6 TERMINAL BLOCK MODEL CYD218S ON 7 3 7 7 IEEE 488 INTERFACE CONNECTOR 7 4 7 8 SERIAL INTERFACE CABLE AND ADAPTERS sseseesesssssrisrrreneerieessrrrsssrrsserenerserirnsreese 7 5 7 9 TOP OF ENCLOSURE REMOVE AND REPLACE PROCEDURE aeee 7 6 7 10 EPROM AND NOVRAM RERLACEMENT 7 7 7 11 ERROR TEE 7 7 7 12 CALIBRATION PROCEDURE aseseeeasessinnsianosesssrtsresresnstntintstaneusisnosrersestetentarinrinaeuarenres 7 9 8 ACCESSORIES soe sosser aonane seser sass dita aa 8 1 APPENDIX A CURVE TABLES icon ia rita A 1 AA AAA AA AAA AAA AA A A A AA ee AA A Table of Contents iii Figure No 2 1 2 2 3 1 3 2 3 3 3 4 4 1 4 2 4 3 5 1 5 2 5 3 6 1 7 1 7 2 7 3 7 4 7 5 7 6 Table No 1 1 3 1 3 2 4 1 4 2 4 3 4 4 5 1 5 2 5 3 6 1 6 2 6 3 6 4 6 5 6 5 7 1 7 2 A 2 Omega Mode CYD218 Temperature Monitor User s Manual LIST OF ILLUSTRATIONS Title Page Silicone Diode Sensor Calibrations and Calunve 2 3 Typical Sensor Installation in a Mech
97. et added together Refer to the ESE command discussion for further details The Standard Event Status Enable Query ESE reads the Standard Event Status Enable Register ESR reads the Standard Event Status Register Once this register has been read all of the bits are reset to zero Power On PON Bit 7 Set to indicate an instrument off on transition Command Error CME Bit 5 If bit 5 is set a command error has been detected since the last reading This means that the instrument could not interpret the command due to a syntax error an unrecognized header unrecognized terminators or an unsupported command Execution Error EXE Bit 4 If bit 4 the EXE bit is set an execution error has been detected This occurs when the instrument is instructed to do something not within its capabilities Device Dependent Error DDE Bit 3 A device dependent error has been detected if the DDE bit is set The actual device dependent error can be found by executing the various device dependent queries Query Error QYE Bit 2 The QYE bit indicates a query error It occurs rarely and involves loss of data because the output queue is full Operation Complete OPC Bit 0 This bit is generated in response to the OPC common command lt indicates when the Model CYD218 has completed all selected pending operations 6 1 4 Example IEEE Setup and Program Below is an example of how to setup and run a simple program using the bu
98. eturn to the normal display The instrument retains values changed prior to pressing Escape 4 6 Operation Omega Model CYD218 Temperature Monitor User s Manual 4 7 1 1 Resetting Max Min To manually reset Max Min press Math The display to the right appears Press Math again to reset Max Min Max Min automatically resets when the instrument is turned off or parameters related to the input change 4 7 2 Linear The Model CYD218 will process a simple linear equation MX B for each sensor input M slope of a line X reading data from a sensor input and B offset of a line The result can be displayed or directed to one of the analog voltage outputs To set up the linear equation press Math select an input Hath setur then press Enter until the fourth display in the Math setting met i sequence appears Use the Data Selection keys to select Z T EL an appropriate source for the selected sensor input X Select witi A NV K Kelvin temperature reading from input Linear Units E Cc Celsius temperature reading from input Sensor Sensor units reading from input Press Enter when the desired source appears In the fifth display of the Math setting sequence specify the M variable then press Enter Resolution is 5 digits 0 0001 to 9999 9 In the sixth display of the Math setting sequence specify the B variable then press Enter Resolution is 5 digits 0 0001 to 9999 9 Press Escape at any time to return to the n
99. eturned Nothing Remarks Configures the linear equation for an input lt input gt Specifies input to configure 1 8 lt varM value gt Specifies a value for m in the equation lt X source gt Specifies input data 1 Kelvin 2 Celsius 3 sensor units lt varB value gt Specifies a value for b in the equation Example LINEAR 6 1 0 2 3 2 term The linear data for Input 6 is calculated from the Celsius reading of the input using the equation y 1 0 x 3 2 LINEAR Query Input Linear Equation Parameters Input LINEAR lt input gt Returned lt varM value gt lt X source gt lt varB value gt Format an nnn n nn nnn Remarks Returns input linear equation configuration See LINEAR command for returned parameter descriptions lt input gt specifies input to query 1 8 LOCK Configure Lock out and Lock out Code Input LOCK lt off on gt lt code gt Returned Nothing Remarks Configures keypad lock out and lock out code lt offion gt Disables enables the keypad lock out lt code gt Specifies lock out code 000 999 Example LOCK 1 123 term Enables keypad lock out and sets the code to 123 LOCK Query Lock out and Lock out Code Input LOCK Returned lt off on gt lt code gt Format n nnn term Remarks Returns lock out status and lock out code See LOCK command for parameter descriptions LOG Turns Logging On and Off Input LOG lt off on gt Returned Nothing Remarks Turns logg
100. example of parameters that require data entry During a data entry sequence use the data entry keys to enter the number value press the Enter key to accept the new data and advance to the next setting Press Escape once to clear the entry twice to return to the Normal display The instrument retains values changed prior to pressing Escape twice Most data entry operations are combined with other settings and grouped under a function key Temperature or sensor unit parameters have the same setting resolution as the display resolution for their corresponding readings 4 3 TURNING POWER ON After verifying line voltage Paragraph 3 3 plug the instrument end of the line cord included with the connector kit into the power and fuse assembly receptacle on the instrument rear Plug the opposite end of the line cord into a properly grounded three prong receptacle Flip power switch located next to the line cord receptacle to the On I position The instrument initiates the following power up sequence the instrument alarm sounds once the display shows a startup message then clears the normal reading display appears If the instrument does not complete the sequence or if a general error message displays there may be a problem with the line power or the instrument Individual messages in a reading location normally indicate that input setup is required 4 4 DISPLAY SETUP The Model CYD218 has a 4 line by 20 character backlit LCD During normal operati
101. fer to Chapter 5 for details on connecting the serial port to a printer 3 6 Installation Omega Model CYD218 Temperature Monitor User s Manual CHAPTER 4 OPERATION 4 0 GENERAL This chapter covers Model CYD218 front panel operation Display Screen Description in Paragraph 4 1 Keypad Description in Paragraph 4 2 Turning Power On in Paragraph 4 3 Display Setup in Paragraph 4 4 Input Type in Paragraph 4 5 Curve Select in Paragraph 4 6 Math in Paragraph 4 7 Analog Outputs in Paragraph 4 8 Alarm Setup and Operation in Paragraph 4 9 Alarm Reset in Paragraph 4 10 Relay Setup in Paragraph 4 11 Locking The Keypad in Paragraph 4 12 and Model CYD218 Reset in Paragraph 4 13 Display Screen Keypad i Escape Ello Data Bi gt Selection EJ Ch Keys CYD218 Temperature Monitor E a Peres ae ee AAN ey Figure 4 1 Model CYD218 Front Panel 4 1 DISPLAY SCREEN DESCRIPTION Sensor Input Reading Source Number Value Annunciator ndase niana W tt an y pl am H ug Te LEI oan E i a KL RK sseeg vi al ns ga Pa Annunciators Figure 4 2 Model CYD218 Normal Display Screen Format Operation 4 1 Omega Model CYD218 Temperature Monitor User s Manual The Model CYD218 has a 4 line by 20 character backlit LCD During normal operation it is divided into eight reading locations Each of the eight reading locations can be configured by the user with the Display Format feature Data from a sensor input can be display
102. g is the instruments response or answer to a query string The instrument will respond only to the last query it receives The response can be a reading value status report or the present value of a parameter Response data formats are listed along with the associated queries in Paragraph 6 3 The response is sent as soon as possible after the instrument receives the query Typically it takes 10 ms for the instrument to begin the response Some responses take longer 6 8 Remote Operation Omega Model CYD218 Temperature Monitor User s Manual 6 2 5 Message Flow Control It is important to remember that the user program is in charge of the serial communication at all times The instrument can not initiate communication determine which device should be transmitting at a given time or guarantee timing between messages All of this is the responsibility of the user program When issuing commands only the user program should e Properly format and transmit the command including terminators as one string e Guarantee that no other communication is started for 50 ms after the last character is transmitted e Not initiate communication more than 20 times per second When issuing queries or queries and commands together the user program should e Properly format and transmit the query including terminators as one string e Prepare to receive a response immediately e Receive the entire response from the instrument including the terminators e Guarante
103. gers when sensor input temperature increases to 100 K and it will not deactivate until temperature drops to 99 K To begin alarm setup press Alarm Setup The display to the right appears Use the Data Selection keys to cycle through the inputs 1 8 to set up for alarms Press Enter when the desired input appears The second display in the setting sequence appears Use the Data Selection keys to turn alarm operation On or Off for the selected input Off Disables alarm operation for the selected input The instrument skips to the eighth display screen below On Enables alarm operation for the selected input and displays the third display in the setting sequence The third display of the setting sequence appears use the Data Selection keys to cycle through source selections for the selected input There are four source options K Kelvin temperature reading from input c Celsius temperature reading from input Sensor Sensor units reading from input Linear Linear equation data from input Press Enter when the desired source appears The next three displays involve data entry Press Escape once to clear the entry twice to return to the Normal display The instrument retains values changed prior to pressing Escape twice The fourth display in the setting sequence appears Use the number keys to input a high alarm setpoint in the specified units then press Enter Resolution is five digits The fifth display in the setting sequence
104. gh cables Paragraph 7 8 illustrates suggested cables that can be used between the instrument and common computers The instrument uses drivers to generate the transmission voltage levels required by the RS 232C standard These voltages are considered safe under normal operating conditions because of their relatively low voltage and current limits The drivers are designed to work with cables up to 50 feet in length To maintain Electromagnetic Compatibility EMC add the clamp on ferrite filter P N 9009 020 included with the connector kit to the Serial Interface cable near the instrument rear panel when that interface is used 6 2 2 Hardware Support The Model CYD218 interface hardware supports the following features Asynchronous timing is used for the individual bit data within a character This timing requires start and stop bits as part of each character so the transmitter and receiver can resynchronized between each character Half duplex transmission allows the instrument to be either a transmitter or a receiver of data but not at the same time Communication speeds of 300 1200 or 9600 baud are supported The Baud rate is the only interface parameter that can be changed by the user Hardware handshaking is not supported by the instrument Handshaking is often used to guarantee that data message strings do not collide and that no data is transmitted before the receiver is ready In this instrument appropriate software timing substitutes for
105. hard copy temperature record The serial port interfaces with standard printers The serial computer interface and a printer cannot be used at the same time Some printer operating parameters are shared with the data log feature It is important to setup data log before trying to print Table 5 3 Serial Printer Interface Specifications Configuration DTE Connector DE 9P Timing Format Asynchronous Parity None Data Interface Levels Transmits and receives using EIA voltage levels Baud Rate 9600 Data Bits 8 Start Stop Bits 1 5 4 1 Printer Support Serial printers connected directly to the Model CYD218 must have a serial interface port and should be Epson or HP compatible and support ASCII text mode Continuous feed printers are recommended for all print modes Single sheet feed printers are recommended for printing stored logs only A minimum print speed of 15 characters per second is required For typical serial printer operation DTR is the preferred method of handshaking Under DTR the printer maintains a HIGH signal when ready to receive Model CYD218 data The signal drops to LOW when the printer suspends the flow of data If a printer uses a different lead for flow control 4 11 19 or 25 connect that lead to pin 6 DSR in ofthe CYD218 serial connector Check printer users manual for more information 5 4 2 Printer Connector amp Cable For most serial printers a standard PC to printer cable may be used Descri
106. igurable Display The eight display locations on the Model CYD218 are user configurable These locations can be used to display a single readout for each of the eight inputs or for more than one readout for fewer inputs Sources for readout data are temperature units sensor units and results of the math function Input number and data source are always displayed for convenience 1 2 SPECIFICATIONS Thermometry Number of Inputs Input Configuration Measurement Type Excitation Supported Sensors temp range Accuracy Resolution Maximum Update Rate Standard Curves User Curves SoftCal Math Filter Front Panel Display Number of input displays Display Units Display Update Rate Temperature Display Resolution Sensor Units Display Resolution Display Annunciators Keypad Front Panel Curve Entry Interface IEEE 488 2 Interface CYD218S Serial Interface Printer Capability Alarms Number Data Source Settings Actuators Relays 2185 Number Contacts Contact Rating Operation Corrected Analog Output CYD218S Scale Range Resolution Accuracy Minimum Load 1 2 8 Two groups of four Each group must contain same input type Four lead differential Eight constant current sources Silicon Diode RTDs 100 Q Platinum 1000 Q Platinum See Table 1 2 16 readings per second total Silicon Diode 10 DT 500D PT 100 PT 1000 Room for eight one per input 200 point maxi
107. ilt in Model CYD218 IEEE 488 interface While it does not reflect every hardware software configuration found in the field it is representative of the overall procedure This example uses the National Instruments GPIB PCII IIA card and QuickBasic 4 0 or 4 5 on a PC compatible 6 1 4 1 GPIB Board Installation 1 Install GPIB PCII IA card using National Instruments instructions Install NI 488 2 software for DOS Version 2 1 1 was used for the example Verify that config sys contains the command device gpib pc gpib com Reboot the computer Run IBTEST to test software configuration Do not install the instrument before running IBTEST Run IBCONF to configure the GPIB PCII IIA board and dev 12 Set the EOS byte to OAH See Figure 6 1 IBCONF modifies gpib com 7 Connect the instrument to the interface board and power up the instrument Verify address is 12 and terminators are CR LF oa fF wN 6 4 Remote Operation Omega Model CYD218 Temperature Monitor User s Manual 6 1 4 2 Running The Example QuickBasic Program 1 Copy c gpib pc Qbasic qbib obj to the QuickBasic directory QB4 2 Change to the QuickBasic directory and type link q qbib obj bqlb4x lib where x 0 for QB4 0 and 5 for QB4 5 This one time only command produces the library file qbib qlb The procedure is found in the National Instruments QuickBasic readme file Readme qb 3 Start QuickBasic Type qb A qbib qlb Start QuickBasic in this way each time
108. ing of 9999 9 K if no limit is needed This parameter is not used by the Model CYD218 Temperature Coefficient The instrument derives the temperature coefficient from the first two breakpoints The user does not enter this setting If it is not correct check for proper entry of those points A positive coefficient P indicates that the sensor signal increases with increasing temperature A negative coefficient N indicates that the sensor signal decreases with increasing temperature Table 5 1 Recommended Curve Parameters 7 Dos e Recommended Silicon Diode CY7 SD 0 00001 V GaAlAs Diode TG 120 0 00001 V Platinum 100 PT 100 Ohms K 800 Positive 0 001 a Platinum 1000 PT 100 Ohms ok 800 Positive Special Features 5 1 Omega Model CYD218 Temperature Monitor User s Manual 5 1 2 Curve Breakpoints Reduce the temperature response data of a calibrated sensor to a table of breakpoints before entering it into the instrument Each breakpoint consists of a value in sensor units and a corresponding temperature value in Kelvin Linear interpolation is used by the instrument to calculate temperature between breakpoints Enter from 2 to 200 breakpoints as a user curve No special endpoints are required Setting resolution is six digits in sensor units The sensor type determines the practical range of values The input resolution of the instrument determines the practical resolution Additional resolution is ignore
109. ing on and off lt off on gt 0 Off 1 On LOG Query Logging Status Input LOG Returned lt off on gt Format n term Remarks Returns logging status See LOG command for parameter descriptions LOGNUM Query Number of Last Data Log Record Stored Input LOGNUM Returned lt last record number gt Format nnnn term Remarks Returns number of last data log record stored Remote Operation 6 25 Omega Model CYD218 Temperature Monitor User s Manual LOGREAD Configure Log Records Input LOGREAD lt reading number gt lt input gt lt source gt Returned Nothing Remarks Configures log records lt reading number gt The individual reading number 1 8 within a log record to configure lt input gt The input number to og 1 8 lt source gt Specifies data source to log 1 Kelvin 2 Celsius 3 sensor units 4 linear data LOGREAD Query Log Record Parameters Input LOGREAD lt reading number gt Returned lt input gt lt source gt Format n n term Remarks Returns log record parameters See LOGREAD command description of returned parameters lt reading number gt specifies an individual reading number 1 8 within a log record to query LOGSET Configure Logging Parameters Input LOGSET lt mode gt lt overwrite gt lt start gt lt period gt lt readings gt Returned Nothing Remarks Configures logging parameters lt mode gt Specifies logging mode 0 Off 1 Log Contin
110. ining 3 inputs of the group Once gain calibration constants for all ranges have been determined and provided back to the Model CYD218 the CALSAVE command is issued to save the constants in the E prom Omega Model CYD218 Temperature Monitor User s Manual 7 12 12 5 kQ Input Gain Calibration PURPOSE To determine the input gain errors when the input is configured for 5 kQ input and provide gain calibration constants back to the Model CYD218 COMFIG Attach the precision 5 kQ resistors to each input of the group Be sure to connect the resistors using proper 4 lead connection techniques Input group configured for 5 kQ input all inputs of the group are enabled PROCESS Via the interface obtain the RAWAD value of the 1 input To determine the calibration constant add the 5 kQ range zero offset constant to the value read and divide 5000 by that value or 5000 RAWAD reading zero offset constant For example if the value read was 2 49870 and the zero offset constant was 0 00005 the gain calibration constant is 5000 2 49875 2001 00 This gain calibration constant is provided back to the Model CYD218 using the GCAL command for the 1 input of the group only The above process must be repeated for the remaining 3 inputs of the group Once gain calibration constants for all ranges have been determined and provided back to the Model CYD218 the CALSAVE command is issued to save the constants in the E prom 7 12 13 Calibrate Input Group B Re
111. inking 2 3 9 Thermal Radiation Thermal black body radiation is one of the ways heat is transferred Warm surfaces radiate heat to cold Surfaces even through a vacuum The difference in temperature between the surfaces is one thing that determines how much heat is transferred Thermal radiation causes thermal gradients and reduces measurement accuracy Many cooling systems include a radiation shield The purpose of the shield is to surround the load sample and sensor with a surface that is at or near their temperature to minimize radiation The shield is exposed to the room temperature surface of the vacuum shroud on its outer surface so some cooling power must be directed to the shield to keep it near the load temperature If the cooling system does not include an integrated radiation shield or one cannot be easily made one alternative is to wrap several layers of super insulation aluminized mylar loosely between the vacuum shroud and load This reduces radiation transfer to the sample space 2 3 10 Thermal EMF Compensation with Voltage Excitation Sensors used at low temperatures must operate with little power dissipated in the sensor To keep power low the voltage across the sensor is kept low Two major problems occur when measuring small DC voltages The first is external noise entering the measurement through the sensor leads which is discussed with sensor setup The second is the presence of thermal EMF voltages sometimes called therm
112. ith DE 9P DE 9P Standard Null Modem Cable DE 9S to DE 9S PC DE 9P 5 GND i GND 2 RD in II A TD out 3 TD ou y 2 RD in 4 DTR ou nk 6 DSR in 6 DSR in _ _ ANAA gt 4141414 A DTR out 1 NC 7 RTS out 7 DTR tied to 4 ES 8 CTS in 8 NC e A a in CYD218 to PC Serial Interface PC with DB 25P DE 9P Standard Null Modem Cable DE 9S to DB 25S PC DB 25P 5 GND _ A gt 7 GND 2 RD in 4 2 TD cout 3 TD 0 Rin 1 NC 4 RTS out 7 DTR tied to 4 5 CTS in 8 NC A A 8 DCD in 6 DSR in _ m 20 DTR out 4 DTR out _ y EB DER On CYD218 to PC Interface using Null Modem Adapter DE 9P Null Modem Adapter PC DE 9P 5 GND A 5 GND 2 RD in 3 TD out TA AAA BRD in 1 NC 4 DTR out 6 DSR in p 1 DCD in 4 DTR out AS e 6 DSR in 7 DTR tied to 4 ____ gt 5 CTS in 8 NC _ z 7 RTS out 9 NC Le H NC NOTE Same as null modem cable design except PC CTS is provided from 218 on DTR CYD218 to Serial Printer Printer with DB 25S P DE 9P PC to Printer Cable using hardware flow control Printer DB 25S P 3 TD out gt 3 RD in 2 RD in A 2 TD out 8 NC 20 DTR 6 DSR in D 1 NC 5 GND A AA lt SS 7 GND A _ AA AA AAA A A A A A A A _ _ Service 7 5 Omega Model CYD218 Temperature Monitor User s Manual Figure 7 5 Serial Port Pinouts Table 7 2
113. iven assuming 10 feet of sensor cable Longer cables 100 feet or more can be used but environmental conditions may degrade accuracy and noise specifications 3 3 2 3 Grounding and Shielding Sensor Leads The sensor input measurements are NOT isolated from earth ground Do not ground sensor leads outside of the instrument Shielding the sensor lead cable is important to keep external noise from entering the measurement A shield is most effective when it is near the measurement potential so the Model CYD218 offers a shield that stays close to the measurement Connect the sensor cable shield to the input connector shield pin Do not terminate the shield at the opposite end Do not connect the shield to earth ground on the instrument chassis or in the cooling system Please note the shell of the connector is in contact with the chassis so the cable shield should never touch the outer shell of the connector If a commercial cable is used in which the outer shield is tied to the connector shell do not terminate the Shield at the sensor end or connect it to a shield pin in the connector 3 4 Installation Omega Model CYD218 Temperature Monitor User s Manual 3 3 2 4 Sensor Polarity Omega Engineering sensors ship with instructions that indicate which Silicon Diode sensor leads are which It is important to follow these instructions for plus Sensor Leads and minus leads polarity as well as voltage and current when applicable Diode sensors do n
114. mal conductivity while stainless steel does not Non metallic electrically insulating materials like alumina oxide and similar ceramics have good thermal conductivity while G 10 epoxy impregnated fiberglass does not Sensor packages cooling loads and sample holders should have good thermal conductivity to reduce temperature gradients Surprisingly connections between thermally conductive mounting surfaces often have very poor thermal conductivity Thermal conductivity can change with temperature Do not assume a heat sink grease that works well at room temperature and above will do the same job at low temperatures Sensor Considerations 2 3 Omega Model CYD218 Temperature Monitor User s Manual 2 3 4 Contact Area Thermal contact area greatly affect thermal conductivity because a larger area has more opportunity to transfer heat Even when the size of a sensor package is fixed thermal contact area can be improved with the use of a gasket material A soft gasket material forms into the rough surface being mated to increase the area of the two surfaces that is in contact Good gasket materials are soft thin and have good thermal conductivity themselves They must also withstand the environmental extremes Indium foil and cryogenic grease are examples 2 3 5 Contact Pressure When sensors are permanently mounted the solder or epoxy used to hold the sensor acts as both gasket and adhesive Permanent mounting is not a good solution for everyon
115. mum for each Improves accuracy of CY7 SD diode to 0 25 K from 30 K to 375 K Improves accuracy of Platinum RTDs to 0 25 K from 70 K to 325 K Stored as user curves Maximum Minimum and Linear Equation Averages 2 to 64 input readings 4 line by 20 character backlit LCD display 1 to 8 K C V Q All displayed inputs twice in one second 0 001 between 0 99 999 0 01 between 100 999 99 0 1 above 1000 Sensor dependent to 5 digits Remote R Alarm A Data Logging D Max gt Min lt Linear 20 Key membrane numeric and specific functions Yes SH1 AH1 T5 L4 SR1 RL1 PP0 DC1 DT0 C0 E1 RS 232C Electrical DE 9 Connector 9600 BAUD Support for serial printer through serial interface Used with Data Log parameters 16 High and low for each input Temperature sensor units linear equation Units High Setpoint Low Setpoint Deadband Latching or Non Latching Audible on or off Display annunciator beeper relays 2188 8 Normally Open NO Normally Closed NC and Common C 30VDC at 5A Each input may be configured to actuate any or all of the 8 relays Relays may be activated on high low or both alarms for any input or manually User selected 10V 1 25mV 2 5mV 1kQ Introduction Data Logging Readings 1 8 per record Operation Store Data Log records in memory or send them to the printer Users may display print or retrieve stored data by computer interfa
116. n 10 seconds when printing If log period is set to a value below 10 the instrument prints a log record every 10 seconds NOTE When using Print Continuous small delays in log period may occur up to approximately 120 ms per printed record For time critical applications Log Continuous mode is recommended Print Event Directs log records to the printer instead of internal memory when an input alarm or an error event either occurs or is removed No period is set by user The instrument checks for an event every 10 seconds and prints if one exists If an event occurs and then is removed within the 10 second window it will not print Use the Data Selection keys to cycle through the different modes When the desired mode appears press Enter to activate that mode Printir Select Print Stored Log to print data immediately The screen to the right displays To stop printing at any time and return to the normal display press Escape Ifthe mode is Print Continuous or Print Event use the Log On Off key to start and stop printing With Print Continuous or Print Event selected only the Data Log D annunciator displays during printing The data log prints in the format below MM DD YY HH MM SS 1 123 45US 2 123 45US 3 123 45US 4 123 45US 5 123 45US 6 123 45US 7 123 45US 8 123 45US MM DD YY Month Day Year HH MM SS Hour Minutes Seconds U Units K Kelvin S Status L Low Alarm C Celsius H High Alarm V Volts B Both Al
117. ncludes 8 inputs serial interface alarms data logging and printer CYD218E support 119 007 Model CYD218 Temperature Monitor User s Manual 106 253 Sensor Mating Connector Two 2 DB 25 D Style plugs for sensor input connector Sensor Mating Connector Shell Two 2 DB 25 D Style shells for sensor input connector 106 772 Terminal Block Mating Connector Two 2 14 Pin connectors for relays and analog outputs for 218S ONLY 115 006 Detachable 120 VAC line cord RM 1 2 Rack Mount Kit Mounts one rack temperature monitors in 482 60 mm 19 rack Rack Mount Kit Mounts two rack temperature monitors in 482 60 mm 19 rack ES Model CYD218 IEEE 488 Cable Kit One meter 3 3 long IEEE 488 GPIB computer interface cable assembly Includes extender which is required to use both IEEE cable and relay terminal block simultaneously Accessories included with a new Model CYD218 WA AAA A A AA AAA AAA A AAA AAA A AAN Accessories 8 1 Omega Model CYD218 Temperature Monitor User s Manual This Page Intentionally Left Blank eee 8 2 Accessories Omega Model CYD218 Temperature Monitor User s Manual APPENDIX A CURVE TABLES Table A 1 Standard CYD SD7 Diode Curve Breakpoint Temp K KH Temp K en ov Temp K 0 09062 0 82405 1 10476 0 10191 K 0 84651 1 10702 0 11356 0 86874 1 10945 0 12547 0 87976 1 11212 0 13759 0 89072 1 11517 0 14985 0 90161 1 11896 0 16221 2
118. ng while showering with warm water The patient should not drink alcohol or smoke Keep warm and rest Call a physician immediately eee 4 4 Introduction Omega Model CYD218 Temperature Monitor User s Manual 1 3 2 Safety Summary Observe these general safety precautions during all phases of instrument operation service and repair Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design manufacture and intended instrument use Omega Engineering assumes no liability for Customer failure to comply with these requirements The Model CYD218 protects the operator and surrounding area from electric shock or burn mechanical hazards excessive temperature and spread of fire from the instrument Environmental conditions outside of the conditions below may pose a hazard to the operator and surrounding area e Indoor use e Altitude to 2000 m Temperature for safe operation 5 C to 40 C Maximum relative humidity 80 for temperature up to 31 C decreasing linearly to 50 at 40 C e Power supply voltage fluctuations not to exceed 10 of the nominal voltage e Overvoltage category Il e Pollution degree 2 Ground The Instrument To minimize shock hazard connect the instrument chassis and cabinet to an electrical ground The instrument is equipped with a three conductor AC power cable Plug the power cable into an approved three contact electrical outlet or u
119. nitor User s Manual Users may store a unique 200 point user curve for each of the eight inputs if standard curves are inadequate User curves can be entered from the front panel or with a computer interface The built in SoftCal algorithm can also generate improved curves for Silicon diodes and platinum sensors stored as user curves See Chapter 5 for details about user curves User curves must be stored in the same location number as the sensor input Once an appropriate user curve stores for a sensor input it can be selected just like standard curves but it can be used for only one input To select a temperature response curve press Curve Select The display to the right appears Use the Data Selection keys to cycle through the inputs 1 8 for which to select a temperature response curve Press Enter when the desired input appears Curve Select Select with A Inrut 1 The second display in the setting sequence appears Use the Data Selection keys to cycle through the temperature response curves When the desired curve appears press Enter to assign that curve to the selected input and return to the normal display Press Escape at any time to return to the normal display The instrument retains values changed prior to pressing Escape 4 7 MATH Simple math features are included for convenience and aid in setting up experiments Readings can be filtered to quiet effects of a noisy environment Max and Min readings can b
120. num Curves 21 28 User Curves NOTE Curve Locations 10 20 not used CRVPT Configure Curve Data Point Input CRVPT lt curve gt lt index gt lt units value gt lt temp value gt Returned Nothing Remarks Configures a user curve data point lt curve gt Specifies which curve to configure 21 28 for inputs 1 8 lt index gt Specifies the points index in the curve 1 200 lt units value gt Specifies sensor units for this point to 6 digits lt temp value gt Specifies corresponding temperature in Kelvin for this point to 6 digits Example CRVPT 21 2 0 10191 470 000 term Sets User Curve 21 input 1 user curve second data point to 0 10191 sensor units and 470 000 K ar SP SSS Remote Operation 6 21 Omega Model CYD218 Temperature Monitor User s Manual CRVPT Query Curve Data Point Input CRVPT lt curve gt lt index gt Returned lt units value gt lt temp value gt Format nnn nnn nnn nnn term Remarks Returns a standard or user curve data point See CRVPT command for parameter descriptions lt curve gt Specifies which curve to query 1 5 Standard Diode Curves 6 9 Standard Platinum Curves 21 28 User Curves NOTE Curve locations 10 20 not used lt index gt Specifies the points index in the curve 1 200 DATETIME Configure Date and Time Input DATETIME lt MM gt lt DD gt lt YY gt lt HH gt lt mm gt lt SS gt Returned Nothing Remarks Configures date and time
121. o the Model CYD218 using the GCAL command This constant is valid for all inputs of the group therefore GCAL must be sent 4 times assigning the constant to each input Once gain calibration constants for all ranges have been determined and provided back to the Model CYD218 the CALSAVE command is issued to save the constants in the E prom 7 12 8 40 pA Current Source Calibration PURPOSE To calibrate all 4 of the 10 yA current sources to within the specified tolerance TOLERANCE 10 pA 0 01 CONFIG 7 10 Attach the precision 200 kQ resistors to each input of the group Be sure to connect the resistors using proper 4 lead connection techniques Input group configured to 2 5 V input all inputs of the group are enabled Front panel display must be set to display all inputs of the group in sensor units Service Omega Model CYD218 Temperature Monitor User s Manual PROCESS Adjust the four current source calibration pots on the Model CYD218 main board until each of the 4 inputs display exactly 2 0000 V 7 12 9 250 Q Input Gain Calibration PURPOSE CONFIG PROCESS To determine the input gain errors when the input is configured for 250 2 input and provide gain calibration constants back to the Model CYD218 Attach the precision 250 2 resistors to each input of the group Be sure to connect the resistors using proper 4 lead connection techniques Input group configured for 250 Q input all inputs of the group are
122. o the defaults listed in Table 4 4 below The second screen in the setting sequence displays IL Se Use the Data Selection keys to select Yes or No to clear all LE user curves stored in the Model CYD218 Standard curves Ase se oe HORAM Ho Ss are unaffected Press Enter The instrument performs the Code Date Bge operations specified then displays the Normal display lear upu Table 4 4 Model CYD218 Parameter Defaults Parameter Default Audible Alarm Display Locations 1 8 Inputs 1 8 Source K Max Min Units 4 12 Operation Omega Model CYD218 Temperature Monitor User s Manual CHAPTER 5 SPECIAL FEATURES 5 0 GENERAL This chapter covers Front Panel Curve Entry in Paragraph 5 1 SoftCal in Paragraph 5 2 Data Logging in Paragraph 5 3 and Printing in Paragraph 5 4 Most users will not find it necessary to use these special features during normal operation 5 1 FRONT PANEL CURVE ENTRY A unique 200 point user curve can be stored for each of the eight inputs CalCurves for Omega Engineering calibrated sensors can be stored as user curves The built in SoftCal algorithm Paragraph 5 2 uses the same memory space so it is not possible to enter a user curve and SoftCal curve for the same input User curves must be stored in the same location number as the sensor input Once an appropriate user curve is stored for a sensor input it can be selected just like standard curves A user
123. ocouple voltages in the lead wiring Thermal EMF voltages appear whenever there is a temperature gradient across a piece of voltage lead They can be canceled in the measurement with a similar temperature gradient in the other voltage lead Thermal EMF voltages must exist because the sensor is almost never the same temperature as the instrument Minimize them by careful wiring verifying voltage leads are symmetrical in the type of metal used and how they are joined and by keeping unnecessary heat sources away from the leads Even in a well designed system thermal EMF voltages can be an appreciable part of a low voltage sensor measurement The Model CYD218 has no thermal correction algorithm Other instruments automatically reverse the current source polarity and average the positive and negative sensor readings to cancel the thermal EMF voltage Account for thermal EMF errors when estimating Model CYD218 measurement accuracy Sensor Considerations 2 5 Omega Model CYD218 Temperature Monitor User s Manual This Page Intentionally Left Blank a e e a aaaaaa 2 6 Sensor Considerations Omega Model CYD218 Temperature Monitor User s Manual CHAPTER 3 INSTALLATION 3 0 GENERAL This chapter covers general Model CYD218 installation instructions Inspection and Unpacking in Paragraph 3 1 Repackaging for Shipment in Paragraph 3 2 and Rear Panel Definition in Paragraph 3 3 3 1 INSPECTION AND UNPACKING inspect shipping containers for e
124. on Glass Cernox Rox Thermox 4 5 1 Optimizing the Update Rate le E ie G i SE all Table 4 2 Sensor Configuration Update Rates eight inputs to be read twice each second Turning off unused inputs Paragraph 4 1 5 permits a higher reading rate on fewer sensors see Table 4 2 For maximum efficiency split sensors evenly between the two input groups when using fewer than eight sensors All new readings can be read from the instrument with either the IEEE 488 or serial interface The display update rate remains at twice per second 4 6 CURVE SELECT Each sensor input of the Model CYD218 must be assigned a temperature response curve if it is used to read temperature If no temperature response curve is assigned to an input it will read in sensor units only During curve selection only curves appropriate for the sensor type will be displayed so sensor type must be selected before curves Standard curves are included in the instrument and can be assigned to sensor inputs that match them Standard curves included in the Model CYD218 are listed in Table 4 3 Table 4 3 Standard Curves Included in the Model CYD218 Curve Display Omega Sensor Temperature CY7 SD_ Silicon Diode ER DT 500 Silicon Diode 1 4 365K Silicon Diode CTICuve C 10 320K PT 100 100 Q Platinum RTD PT 100 DIN 43760 30 800 K PT 1000 1000 Q Platinum RTD PT 1000 DIN 43760 30 800 K Operation 4 5 Omega Model CYD218 Temperature Mo
125. on it is divided into eight reading locations Each of the eight reading locations can be configured by the user with the Display Format feature Data from a sensor input can be displayed in any location Sensor readings can be displayed in temperature or sensor units Results of the math feature can be displayed at the same time as live readings The reading location indicates the number of the sensor input to the left of the reading value The character to the right of the reading value indicates units for live readings or shows an annunciator for one of the math values The column of characters on the far right side of the display are used for system annunciators See Figure 4 2 During keypad operation display format changes to prompt for data entry Reading locations numbered 1 8 correlate to the sensor input numbers in Figure 4 2 To configure the display press Display Format The first display of the setting sequence shown to the right appears Use the Data Selection keys to cycle through display locations 1 8 Press Enter when the desired 1 location appears WV H The second display in the setting sequence appears Use the Data Selection keys to cycle through input selections 1 8 or none for the selected display location Select None to blank the display location Press Enter when the desired input appears The same input may display in different locations simultaneously ayu Format EK Location i t with A i E E DA D et et
126. original RS 232C standard specifies 25 pins but both 9 and 25 pin connectors are commonly used in the computer industry Many third party cables exist for connecting the instrument to computers with either 9 or 25 pin connectors Paragraph 6 5 gives the most common pin assignments for 9 and 25 pin connectors Please note that not all pins or functions are supported by the Model CYD218 The instrument serial connector is the plug half of a mating pair and must be matched with a socket on the cable If a cable has the correct wiring configuration but also has a plug end a gender changer can be used to mate two plug ends together The letters DTE near the interface connector stand for Data Terminal Equipment and indicate the pin connection of the directional pins such as transmit data TD and receive data RD Equipment with Data Communications Equipment DCE wiring can be connected to the instrument with a straight through cable As an example pin 3 of the DTE connector holds the transmit line and pin 3 of the DCE connector holds the receive line so the functions complement It is likely both pieces of equipment are wired in the DTE configuration In this case pin 3 on one DTE connector used for transmit must be wired to pin 2 on the other used for receive Cables that swap the complementing lines are called null modem cables and must be used between two DTE wired devices Null modem adapters are also available for use with straight throu
127. ormal display The instrument retains values changed prior to pressing Escape 4 7 3 Filter The reading filter applies exponential smoothing to the sensor input readings If the filter is turned on for a sensor input all reading values for that input are filtered The filter does not change the update rate on an input Filtered readings are available as often as non filtered readings The number of filter points determines how much smoothing is done One filter point corresponds to one new reading on that input A larger number of points does more smoothing but also slows the instruments response to real changes in temperature If the measured temperature changes quickly the reading will settle at the tr a Fi SeturP new value in about 6 times the number of filter points E Sne ZS Se Mating l l InFuat 1 The filter window is a limit for restarting the filter If a single Select with A T reading is different from the filter value by more than the ZLEE WILH limit the instrument wili assume the change was intentional Filter Off and restart the filter Filter window is set in percent of full scale range To set up the filter press Math select an input then press Math Enter until the seventh display of the Math setting Input Sak sequence appears Use the Data Selection keys to tum Select with A the filter On or Off then press Enter to continue SE E E e ae Filter Points De On Filters all reading values for the specified input
128. ot enough V feedthroughs or room for lead wires If this is the case plus voltage to Two Lead plus current and minus voltage to minus current leads are attached at Diode the back of the instrument or at the vacuum feedthrough z V The error in a resistive measurement is the resistance of the lead wire run with current and voltage together If the leads contribute 2 or 3 Q to a 10 kQ reading the error can probably be tolerated When measuring voltage for diode sensors the error in voltage can be calculated as the lead resistance times the current typically 10 uA For example a 10 Q lead resistance times 10 uA results in a 0 1 mV error in voltage Given the sensitivity of a silicon diode at 4 2 K the error in temperature would be only 3 mK At 77 K the sensitivity of a silicon diode is lower so the error would be close to 50 mK Again this may not be a problem for every user NOTE The Model CYD218 does not have three lead measurement capability 3 3 2 7 Lowering Measurement Noise Good instrument hardware setup technique is one of the least expensive ways to reduce measurement noise The suggestions fall into two categories 1 Do not let noise from the outside enter into the measurement and 2 Let the instrument isolation and other hardware features work to their best advantage Use four lead measurement whenever possible Do not connect sensor leads to chassis or earth ground Use twisted shielded cable outside the cooling system
129. ot operate in the wrong polarity They look like an open circuit to the instrument Two lead resistors can operate with any lead arrangement and the sensor instructions may not specify Four lead resistors may depend more on lead arrangement Follow any specified lead a assignment for four lead resistors Mixing leads could give a reading that e Cathode SS Jee Anode appears correct but is not the most accurate 3 3 2 5 Four Lead Sensor Measurement All sensors including both two lead and four lead can be measured with a four lead technique Four lead measurement eliminates the effect of lead resistance on the measurement If it is not taken out lead resistance is a direct error when measuring a sensor y Four Lead Platinum Four Lead In a four lead measurement current leads and voltage leads run separately to the sensor With separate leads there is little current in the voltage leads so their resistance does not enter into the measurement Resistance in the current leads will not change the current as long as the voltage compliance of the current source is not reached When two lead sensors are used in four lead measurements the short leads on the sensor have an insignificant resistance NOTE The Model CYD218 does not have three lead measurement capability 3 3 2 6 Two Lead Sensor Measurement Sometimes a crowded cryogenic system forces users to read sensors I in a two lead configuration because there are n
130. ough the different log modes listed below When the desired mode appears press Enter off Disables Log functions Log On Off will not Ni initiate logging and current logging stops ee Su Selecting Off displays the Set Time screen next noe see below Select with AS Log Continuous Logs data to internal memory at regular Loa Continuous intervals Log Event Logs to internal memory only when an input Los Setur configured for logging goes into or comes out x gt ay of an alarm or error condition A herurite Data Print Continuous Sends data to printer using data log setup lect with A parameters Sends one record at a time with a minimum of 10 seconds between records Print Event Similar to Log Event The instrument sends data to the printer instead of logging it to internal memory Set a E d bc d The second display in the setting sequence appears Use the Data lec t with A Selection keys to specify the Overwrite status listed below When ati the desired status appears press Enter Yes Data logging continues beyond the maximum number of records specified and overwrites old records with new No Data logging stops at the maximum number of records specified FHE The third display in the setting sequence appears Use the Data Selection keys to specify the Start Mode listed below When the Z db desired mode appears press Enter Hu I E SE Ge Readings Clear Log On command clears old records before an T T
131. peat steps in Paragraphs 7 12 4 thru 12 for input Group B Inputs 5 8 7 12 14 ANALOG OUTPUT CALIBRATION AND TEST MODEL CYD218S ONLY The Model CYD218S has two analog outputs which require calibration Zero offset and gain are adjusted for each input via pots on the Model CYD218 main board NOTE Analog output calibration must be performed on both analog outputs 7 12 14 1 Analog Output Zero Adjust PURPOSE To adjust the zero offset error of the analog output amplifier to 0 V CONFIG The positive lead of the DVM is connected to the analog output positive terminal the negative lead is connected to the analog output negative terminal The DVM should be set to read DC VOLTS Via the front panel manually set the analog output to 0 V TOLERANCE 12 5 mV PROCESS Adjust the offset adjust pot of the analog output being calibrated until the DVM displays 0 000 0 002 V 7 12 14 2 Analog Output Gain Adjust PURPOSE To adjust the full scale gain error of the analog output amplifier CONFIG The positive lead of the DVM is connected to the analog output positive terminal the negative lead is connected to the analog output negative terminal The DVM should be set to read DC VOLTS Via the front panel manually set the analog output to 10 V TOLERANCE 2 5mvV PROCESS Adjust the gain adjust pot of the analog output being calibrated until the DVM displays 10 000 10 002 V 7 12 14 3 Analog Output Negative Full Scale Test PURPOSE To che
132. ph details how to connect sensors to the Model CYD218 inputs The sensor inputs operate with most resistive and diode sensors See Paragraph 4 5 to configure inputs for a sensor type with software Disable unused sensor inputs with the Input Type key Paragraph 4 5 It is possible for an overioad condition on one sensor to affect the reading on another in the same connector Wire redundant sensors in separate connectors for best reliability Split fewer than eight sensors evenly between connectors for best reading efficiency e pp INE ATEN CA ESO II ET CE S s SI ar 24 a 12 ae 24 8 Figure 3 3 Input Connector Pinouts S Shield NC No Connect 3 3 2 2 Sensor Lead Cable The sensor lead cable used outside the cooling system can be much different form what is used inside Between the instrument and vacuum shroud heat leak is not a problem but error and noise pick up need to be minimized Larger conductor 22 to 28 AWG stranded copper wire is recommended because it has low resistance yet remains flexible when several wires are bundied in a cable The arrangement of wires in a cable is also important For best results twist voltage leads V and V together and twist current leads I and together Cover the twisted pairs of voltage and current leads with a braided or foil shield connected to the shield pin of the instrument This type of cable is available through local electronics suppliers Instrument specifications are g
133. prevents accidental changes to parameter values is locked some parameter values may be viewed but most cannot be changed over the fr Reset is the only keypad function that remains active when the keypad is locked When the keypad ont panel Alarm A three digit keypad lock code locks and unlocks the keypad The factory default code is 123 The code can be changed only through the computer interface If instrument parameters are reset to default values the lock code resets also The instrument cannot reset from the front panel with the keypad locked To lock the keypad press and hold Enter for 10 seconds to display the screen to the right Enter Use the number keys to enter the 3 digit lock code The keypad locks and the normal display appears Changes attempted to any of the Model CYD218 parameters result in a brief display of the LOCKED message To unlock the keypad press and hold Enter for 10 seconds to display the screen to the right nalock ne 1 dl us io De Use the number keys to enter the 3 digit lock code The keypad unlocks and the normal display appears All Model CYD218 parameters are now accessible 4 13 RESETTING MODEL CYD218 TO DEFAULTS To reset the Model CYD218 to defaults press and hold 1 Oe ZC DE Escape until the screen to the right appears a aq eo Use the Data Selection keys to select Yes or No to reset the dea Date Ae Ase NOVRAM then press Enter Select Yes to reset all Model CYD218 parameters t
134. ption Pin 6 DataSetReady DSRin 8 No Connection NC 9 NoConnection NC NOTE A P at the end of a connector description indicates a male connector an S indicates a female connector CYD218 to Serial Printer Printer with DB 25S P DE 9P PC to Printer Cable using hardware flow control Printer DB 25S P 3 TD out SW A ROD in 2 RD in A 2 TD out 8 NC 20 DTR 6 DSR in 1 NC 5 GND eS GND Figure 5 3 Serial Port Pinouts 5 10 Special Features Omega Model CYD218 Temperature Monitor User s Manual Ne 5 4 3 Printer Operation To print with the Model CYD218 first connect the serial Printer port to a serial printer then press Printer The screen shown to the right displays The Model CYD218 printer function has three operating modes Printer function can also be turned off freeing the port for serial interface operation Printer modes are off No printer operation serial I O enabled Print Stored Log Prints the contents of data log memory to the printer The data log feature is described in section 5 3 Once the data log sequence completes all stored records can print Printing the entire contents of memory may take up to 40 pages Normal sensor reading operation suspends during printing Print Continuous Directs log records to the printer instead of internal memory Setup the data log feature as described in paragraph 5 3 1 The log period must be greater tha
135. r a single input or all inputs lt input gt Specifies which input s to query 0 all inputs 1 8 individual input NOTE Use 0 all inputs when reading two or more inputs at the maximum update rate of 16 rdgs sec Remote Operation 6 29 Omega Model CYD218 Temperature Monitor User s Manual This Page Intentionally Left Blank Remote Operation Omega Model CYD218 Temperature Monitor User s Manual CHAPTER 7 SERVICE 7 0 GENERAL This chapter provides general service information for the Model CYD218 Temperature monitor including General Maintenance Precautions in Paragraph 7 1 Electrostatic Discharge in Paragraph 7 2 Line Voltage Selection in Paragraph 7 3 Fuse Replacement in Paragraph 7 4 Sensor Input Connector and Pinout in Paragraph 7 5 Terminal Block Model CYD218S only in Paragraph 7 6 IEEE 488 Interface Connector in Paragraph 7 7 Serial Interface Cable and Adapters in Paragraph 7 8 Top of Enclosure Remove and Replace Procedure in Paragraph 7 9 EPROM and NOVRAM Replacement in Paragraph 7 10 and Error Messages in Paragraph 7 11 There is no calibration procedure for the Model CYD218 There are no serviceable parts inside the Model CYD218 Contact Omega Engineering about specific problems with the Model CYD218 7 4 GENERAL MAINTENANCE PRECAUTIONS Below are general safety precautions unrelated to any other procedure in this publication These are recommended precautions that personnel should understand and
136. range 7 128 units over range RELAY Configure Relay Control Parameters Input RELAY lt relay number gt lt mode gt lt input alarm gt lt alarm type gt Returned Nothing Remarks Configures relay control lt relay number gt Specifies which relay to configure 1 8 lt mode gt Specifies relay mode 0 Off 1 On 2 Alarms lt input alarm gt Specifies which input alarm activates the relay when the relay is in alarm mode 1 8 lt alarm type gt Specifies the input alarm type that activates the relay when the relay is in alarm mode 0 Low alarm 1 High Alarm 2 Both Alarms Examples RELAY 3 2 3 Otem Relay 3 activates when Input 3 low alarm activates RELAY Query Relay Control Parameters Input RELAY lt relay number gt Returned lt mode gt lt input gt lt alarm type gt Remarks Returns relay control parameters See the RELAY command for returned parameter descriptions lt relay number gt specifies which relay to query RELAYST Query Relay Status Input RELAYST Returned lt relay status bit weighting gt Format nnn term Remarks The integer returned represents the sum of the bit weighting of the relay status Bit Bit Weighting Active Relay 1 0 Relay 1 1 2 Relay 2 2 4 Relay 3 3 8 Relay 4 4 16 Relay 5 5 32 Relay 6 6 64 Relay 7 7 128 Relay 8 6 28 Remote Operation Omega Model CYD218 Temperature Monitor User s Manual SCAL Input Returned Remarks Example SRDG
137. rminal Block Pins PIN DESCRIPTION DESCRIPTION PIN 3 Relay 1com 16 Relays COM La relay 1no 17 Relay so a Relay 20 18 reiyenc Ts Retay2com 19 Relay 6 COM ES ES Ka 2 3 20 a Relay com 22 Relay 7COM o Relay ano 23 Relay 7NO 1 1 Analog 1 Signal Analog 2 Signal Analog 1 Gnd Analog 2 Gnd Service 7 3 Omega Model CYD218 Temperature Monitor User s Manual 7 7 IEEE 488 INTERFACE CONNECTOR IEEE 488 INTERFACE SH1 AH1 TS L4 SR1 RL1 PPO DCH DTO CO E1 Y AW 10 g 8 7 6 5 4 3 2 1 E 22 2 2 d 18 7 16 15 WM 3 Figure 7 4 IEEE 488 Rear Panel Connector es ee Service 7 4 Oo JO Om P Ob A PIN SYMBOL DESCRIPTION Data Input Output Line 1 Data Input Output Line 2 Data Input Output Line 3 Data Input Output Line 4 End Or Identify Data Valid Not Ready For Data Not Data Accepted interface Clear Service Request Attention Cable Shield Data Input Output Line 5 Data Input Output Line 6 Data Input Output Line 7 Data Input Output Line 8 Remote Enable Ground Wire Twisted pair with DAV Ground Wire Twisted pair with NRFD Ground Wire Twisted pair with NDAC Ground Wire Twisted pair with IFC Ground Wire Twisted pair with SRQ Ground Wire Twisted pair with ATN Logic Ground Omega Model CYD218 Temperature Monitor User s Manual 7 8 SERIAL INTERFACE CABLE AND ADAPTERS CYD218 to PC Serial Interface PC w
138. ropriate location To erase a breakpoint use the Data Selection keys to scroll to the breakpoint then set both sensor units and temperature values to zero The instrument erases the point and moves following points up To erase an entire curve refer to Paragraph 5 1 5 5 2 Special Features Omega Model CYD218 Temperature Monitor User s Manual 5 1 4 Entering a New Curve To begin entering a user curve press Curve Entry The first screen appears Use the Data Selection keys to select Edit Curve then press Enter Curie Entra The second display in the setting sequence appears Use the Data Selection keys to cycle through the different inputs to which the curve applies 1 8 and standard curves If a standard curve is selected the curve view screen appears Standard curves are read only users cannot change their parameters When the desired input or standard curve appears press Enter The third display in the setting sequence appears Use the number keys to input up to a ten digit serial number for the curve to be entered then press Enter The fourth display in the setting sequence appears Use the Data Selection keys to select the appropriate sensor format for the installed sensor There are three formats VIR Volts vs Kelvin for Diode sensors Q K Resistance vs Kelvin for platinum RTD sensors Log Q K Log Resistance vs Kelvin for NTC resistive sensors When the desired format appears press Enter Refer to Table 5
139. rresponding to the highest setting of the analog output 10 V then press Enter Resolution is 5 digits Press Escape at any time to return to the normal display The instrument retains values changed prior to pressing Escape After setting all Input mode parameters the normal display appears 4 8 1 Example of Low and High Analog Parameter Setting With the analog output set to input Low High mode the temperature input data Input Temperature K 0 500 1000 and voltage output data can be e related as shown in the top Unipolar Output V 0 5 10 diagram This setup results in a wide temperature range but sensitivity is poor The resulting Low High sensitivity is 0 01 V K or 10 mV K Input Temperature K 50 75 100 If the application does not require a wide temperature range the Unipolar Output V 0 5 10 user can change the value of the low and high parameters to improve sensitivity The bottom diagram shows how sensitivity improves when working at liquid nitrogen temperature 77 K This setup has a narrow range with much improved sensitivity of 0 2 V K or 200 mV K Please note that in any application the resolution of the analog output voltage is always 1 25 mV as specified Figure 4 3 Example of Low and High Analog Parameter Setting 4 9 ALARMS SETUP AND OPERATION Each input of the Model CYD218 has high and low
140. s 4 Description of system 5 Returned Authorization RA number Wrap instrument in a protective bag and use original spacers to protect controls Repack the system in the shipping carton if available and seal it with strong paper or nylon tape Affix shipping labels and FRAGILE warnings Write the RA number on the outside of the shipping container or on the packing slip Cc er 5 o Installation 3 1 Omega Model CYD218 Temperature Monitor User s Manual 3 3 REAR PANEL DEFINITION CAUTION Verify that the AC Line Voltage shown in the window on the fuse holder is appropriate for the intended AC power input If the voltage setting is changed remove and verify the proper fuse is installed before inserting the power cord and turning on the instrument Always tum off the instrument before making any rear panel connections This is especially critical when making sensor to instrument connections EEN a aR v 6 Vonage 100 120V 0264 T260Y_ 028x125 220 240V 0 126 AT 260Y 6X20mm 1 Line Input Assembly See Paragraph 3 3 1 2 Serial UO and Printer Connector See Paragraph 6 2 3 Sensor Input Connector for Inputs 1 4 See Paragraph 3 3 2 1 4 Sensor input Connector for Inputs 5 8 See Paragraph 3 3 2 1 5 Terminal Block for Relays and Analog Outputs 218S See Paragraph 3 3 3 6 IEEE 488 INTERFACE Connector 218S See Paragraph 6 1 Figure 3 1 Model CYD218 Rear Panel 3 3 1 Line Input Assembly The line input assembly contains th
141. s new records will continue to overwrite old ones until the sequence is stopped With logging active the Data Log D annunciator displays If overwrite is set to No the D annunciator will turn off when the end of the data buffer is reached 5 3 3 Viewing Logged Data To view logged records first turn off logging with the Log On Off key then press Log View If logging is active when Log View is pressed logging pauses while data is viewed and resumes after Log View is exited When viewing logged records the screen shown to the right displays The data log screen includes a record number time date and the readings specified in the log setup The instrument tags any readings in which an alarm or error occurs with alarm error designations listed below L Low Alarm T Temperature Over or Under Range H High Alarm S Sensor Over or Under Range B Both Alarms Use the Data Selection keys to scroll up and down Scrolling up past the first record will show the last record a nee ee 8 oU SL Special Features 5 9 Omega Model CYD218 Temperature Monitor User s Manual 5 3 4 Line Power Loss Data log memory is non volatile and will not erase when line power is lost The Model CYD218 cannot log data while power is off but it resumes the data log sequence when power is restored Date and time are also non volatile and do not have to be entered after power loss 5 4 PRINTING The Model CYD218 can send sensor input data to a printer for a
142. s through max min 1 Kelvin 2 Celsius 3 sensor units 4 linear data MNMXRDG Query Min Max Data for an Input Input MNMXRDG lt input gt Returned lt min value gt lt max value gt Format nn nnn nn nnn term Remarks Returns the minimum and maximum input data lt input gt specifies which input to query MNMXRST Resets Min Max Function for All Inputs Input MNMXRST Returned Nothing Remarks Resets the minimum and maximum data for all inputs MODE Configure Remote Interface Mode Input MODE lt mode gt Returned Nothing Remarks Configures the remote interface mode lt mode gt specifies which mode to operate 0 local 1 remote 2 remote with local lockout Example MODE 2 term Places the Model CYD218 into remote mode with local lockout MODE Query Remote Interface Mode Input MODE Returned lt mode gt Format n term Remarks Returns the remote interface mode 0 local 1 remote 2 remote with local lockout Remote Operation 6 27 Omega Model CYD218 Temperature Monitor User s Manual RDGST Query Input Status input RDGST lt input gt Returned reading bit weighting gt Format nnn term Remarks The integer retumed represents the sum of the bit weighting of the input status flag bits lt input gt specifies which input to query Bit Bit Weighting Status Indicator Bit Bit Weighting Status Indicator 4 16 temp under range 6 64 units under range 5 32 temp over
143. saaesasesaaeeeaecearseaesenevsseeasenaeees 1 1 AC Line Input Defnttons conc conan ron ono nora non rananoc ono conca rancio rana 3 2 Terminar Block Connector PAS iii AA ii di 3 6 Sensor Input Type Display Messages reires 4 5 Sensor Configuration Update Rates cono nonnnononnnnnncoroon raro rnnnanon arranca 4 5 Standard Curves Included in the Model CYD218 oooococococcococcocoucnonnnnncnncrnnonanononn corn conono conan nnconccnos 4 5 Model CYD218 Parameter Defaults ccccccesccsssceseccssecssecscecssecseecseeceuscescessecasessssesenenseessenss 4 12 Recommended Curve Parameiers esr nns 5 1 Storage Capability Based on Readings per Record ccconooccccococccocooancnoconcccnononnncnnonnnnncnna cn no nononoss 5 8 Serial Printer Interface Specifications oooononnonninnnonicanonccononononananicacinncon corn ncrnnono nano noo ncon craneo 5 10 Sample BASIC IEEE 488 Interface Program 6 5 Serial Interface Parametros 6 8 Serial Interface Program Control Properties cccccccccccccssesscssecsecescsecsscsecsersessuacsaceaeenaeseesace 6 11 Visual Basic Serial Interface Program 6 12 Quick Basic Serial Interface Program 6 13 Model CYD218 Interface Commandes sssseseseseesesesisisesesesesrerererinrnrstnranoorinonornananaraninnnrararanin 6 16 Terminal Ee tri dl a O a el ae isis deve 7 3 Typical Pin Configuration for Serial Ports oooonooonnoniononiniccononcconacanonoconocona ro nononon cono ranana con nannn narnia
144. se a three contact adapter with the grounding wire green firmly connected to an electrical ground safety ground at the power outlet The power jack and mating plug of the power cable meet Underwriters Laboratories UL and Intemational Electrotechnical Commission IEC safety standards Ventilation The instrument has ventilation holes in its top and bottom covers Do not block these holes when the intrument is turned on Do Not Operate In An Explosive Atmosphere Do not operate the instrument in the presence of flammable gases or fumes Operation of any electrical instrument in such an environment constitutes a definite safety hazard Keep Away From Live Circuits Operating personnel must not remove instrument covers Refer component replacement and internal adjustments to qualified maintenance personnel Do not replace components with power cable connected To avoid injuries always disconnect power and discharge circuits before touching them Do Not Substitute Parts Or Modify Instrument Do not install substitute parts or perform any unauthorized modification to the instrument Return the instrument to an authorized Omega Engineering Cryotronics Inc representative for service and repair to ensure that safety features are maintained Cleaning Do not submerge instrument Clean only with a damp cloth and mild detergent Exterior only Introduction 1 5 Omega Model CYD218 Temperature Monitor User s Manual 1 3 3 Safety Symbols Dir
145. ses range Type of compare on EOS i from 0 to 30 00H to 1EH Send EOI at end of Write Adding 32 to the primary address forms the Listen Address LA Enable Repeat Addressing Adding 64 to the primary address forms the Talk Address TA EXAMPLE Selecting a primary address of 10 yields the following 10 32 42 Listen address 10 64 74 Talk address Fl Help F6 Reset Value F9 Esc Return to Map Ctl PgUp PgDn Next Prev Board Figure 6 1 Typical National Instruments GPIB Configuration from IBCONF EXE Remote Operation Omega Model CYD218 Temperature Monitor User s Manual 6 2 SERIAL INTERFACE OVERVIEW The serial interface used in the Model CYD218 is commonly referred to as an RS 232C interface RS 232C is a standard of the Electronics Industries Association EIA that describes one of the most common interfaces between computers and electronic equipment The RS 232C standard is quite flexible and allows many different configurations However any two devices claiming RS 232C compatibility cannot necessarily be plugged together without interface setup The remainder of this paragraph briefly describes the key features of a serial interface that are supported by the instrument A customer supplied computer with similarly configured interface port is required to enable communication 6 2 1 Physical Connection The Model CYD218 has a 9 pin D Subminiature plug on the rear panel for serial communication The
146. t command Remote Operation 6 5 Omega Model CYD218 Temperature Monitor User s Manual 6 6 National Instruments GPIBO Configuration GPIB PC2 2A Ver 2 1 Primary GPIB Address Select the primary GPIB address by Secondary GPIB Address using the left and right arrow keys Timeout setting This address is used to compute the Terminate Read on EOS talk and listen addresses which Set EOI with EOS on Writes identify the board or device on the Type of compare on EOS i GPIB Valid primary addresses range from 0 to 30 00H to 15H Send EOI at end of Write Adding 32 to the primary address System Controller forms the Listen Address LA Assert REN when SC Adding 64 to the primary address Enable Auto Serial Polling forms the Talk Address TA Enable CIC Protocol EXAMPLE Selecting a primary address Parallel Poll Duration of 10 yields the following Use this GPIB board 2 10 32 42 Listen address y 10 64 74 Talk address Base I O Address Fl Help F6 Reset Value F9 Esc Return to Map Ctl PgUp PgDn Next Prev Board National Instruments DEV12 Configuration GPIB PC2 2A Ver 2 1 Primary GPIB Address Select the primary GPIB address by Secondary GPIB Address using the left and right arrow keys Timeout setting E Serial Poll Timeout This address is used to compute the talk and listen addresses which Terminate Read on EOS identify the board or device on the Set EOI with EOS on Writes GPIB Valid primary addres
147. t input gt Specifies which input to query 1 8 lt curve number gt Specifies which curve the input uses 0 none 1 5 Standard Diode Curves 6 9 Standard Platinum Curves 21 28 User Curves Note Curve locations 10 20 not used Remote Operation 6 23 Omega Model CYD218 Temperature Monitor User s Manual INPUT Configure Input Contro Parameter Input INPUT lt input gt lt off on gt Returned Nothing Remarks Turns selected input on or off lt input gt Specifies which input to configure 1 8 lt off on gt Disables Enables input 0 Off 1 On Example INPUT 4 0 Input 4 is turned off and not scanned INPUT Query Input Control Parameter Input INPUT lt input gt Returned lt off on gt Format n term Remarks Returns selected input status lt input gt specifies which input to query 1 8 INTYPE Configure Input Type Parameters Input INTYPE lt input group gt lt sensor type gt Returned Nothing Remarks Configures input type parameters for a group of inputs lt input group gt Specifies input group to configure A inputs 1 4 B inputs 5 8 lt sensor type gt Specifies input sensor type Valid entries 0 2 5V Diode 2 250Q Platinum 4 5kQ Platinum 1 7 5V Diode 3 500Q Platinum 5 Cernox Example INTYPE A O term Sets Inputs 1 4 sensor type to silicon diode INTYPE Query Input Type Parameters Input INTYPE lt input group gt Returned lt sensor type gt Format n term
148. temperature range of some sensors The Model CYD218 is limited to operation above 1 K or more 2 2 2 SoftCal SoftCal is a good solution for applications that do not require the accuracy of a traditional calibration The SoftCal algorithm uses the predictability of sensors that follow a standard curve to improve individual sensor accuracy A few known temperature points are required to perform SoftCal The Model CYD218 can perform a SoftCal calibration The user must provide one two or three known temperature reference points Calibration range and accuracy depend on these points see Paragraph 5 2 2 2 3 Standard Curves Some types of sensors behave very predictably and a standard temperature response curve can be created for them Standard curves are a convenient and inexpensive way to get reasonable temperature accuracy Sensors with a standard curve are often used when interchangability is important Some individual sensors are selected for their ability to match a published standard curve and sold at a premium but in general these sensors do not provide the accuracy of a calibrated sensor For convenience the Model CYD218 has several standard curves included in firmware 2 3 SENSOR INSTALLATION For more detailed information Omega sensors ship with installation instructions that cover that specific sensor type and package The Omega Engineering Temperature Measurement and Control Catalog includes an installation section as well Omega
149. ter to off The Service Request Enable Register allows the user to inhibit or enable any of the status reports in the Status Byte Register The SRE command is used to set the bits If a bit in the Service Request Enable Register is set 1 then that function is enabled Refer to the SRE command discussion Data Log Done Bit 7 This bit is set when data log is completed Service Request SRQ Bit 6 Determines whether the Model CYD218 is to report via the SRQ line and six bits determine which status reports to make If bits 0 2 3 4 5 or 7 are set then the corresponding bit in the Status Byte Register is set The Model CYD218 produces a service request only if bit 6 of the Service Request Enable Register is set If disabled the Status Byte Register can still be read by the BUS CONTROLLER by means of a serial poll SPE to examine the status reports but the BUS CONTROLLER will not be interrupted by the Service Request The STB common command reads the Status Byte Register but will not clear the bits It must be understood that certain bits in the Status Byte Register continually change Bits 0 5 and 7 remain latched until the Status Byte Register is read The bit assignments are discussed below as they pertain to the Status Byte Register These reports can only be made if they have been enabled in the Service Request Enable Register Standard Event Status ESB Bit 5 When bit 5 is set it indicates if one the bits from
150. ters associated with that mode follow on setting screens The two outputs are configured independently and can have different modes To set the operating mode of an analog output press Analog Outputs The display to the right appears Use the Data Selection keys to choose which output to configure 1 2 the press Enter The second display in the setting sequence appears Use the Data Selection keys to cycle through different modes for the selected analog output Off Manual Input When the desired mode appears press Enter to assign that mode to the selected output Analog Output OFF Select Off to set the selected analog output to zero volts and return to the normal display Analog Output Manual Mode Select Manual to control output voltage from the front panel After selecting manual mode select unipolar or bipolar operation then press Enter Set the output value in percent with a range of 100 00 to 100 00 corresponding to 10 V to 10 V The setting resolution is 0 01 but actual output voltage resolution is 0 0125 Press Enter again to return to the Normal display Analog Output Input Mode Select Input to set output voltage proportional to an input Outeuts with ar Outeut 1 na loa Outeuts aloa Quteut 1 ect with A T A net Analo3 Ontruts Analog Quteut 1 Marual Uutrut Walue Analoga Outeuts A alos Outeut 1 Select with Inet 1 A aloa Quteuts Analod Ontent 1 Select with A Units E Analoga Qutre
151. the IEEE interface is used to link in the library file 4 Create the IEEE example interface program in QuickBasic Refer to Table 6 1 Name the file jeeeexam bas and save 5 Run the program 6 1 5 Notes On Using the IEEE Interface To chain commands or queries together insert a semi colon between them Multiple queries cannot be chained The Model CYD218 responds to the last query entered when addressed as a talker e Queries generally use the same syntax as an associated setting command followed by a question mark They most often return the same information that is sent Some queries have no command form The term free field indicates that the decimal point is a floating entity and can be placed at any appropriate place in the string of digits Leading zeros and zeros following a decimal point are unneeded in a command string but they are sent in response to a query A leading is not required but a leading is required e term indicates where the user places terminating characters or where they appear on a returning character string from the Model CYD218 Table 6 1 Sample BASIC IEEE 488 Interface Program IEEEEXAM BAS EXAMPLE PROGRAM FOR IEEE 488 INTERFACE This program works with QuickBasic 4 0 4 5 on an IBM PC or compatible The example requires a properly configured National Instruments GPIB PC2 card The REM SINCLUDE statement is necessary along with a correct path to the file QBDECL BAS C
152. ting change sequence and numeric data entry The function of each key is described below followed by general operation Display Format Formats the reading display including units selection See Paragraph 4 4 Relay Setup Configures relays and associates them with the alarm feature 218S See Paragraph 4 11 Alarm Setup Sets up alarms See Paragraph 4 9 Alarm Reset Resets latched alarm state See Paragraph 4 10 Input Type Configures an input set for sensor type Also disables unused inputs See Paragraph 4 5 Curve Select Selects a temperature response curve for an input See Paragraph 4 6 Curve Entry Manually enters a temperature response curve and copies curve data See Paragraph 5 1 Analog Outputs Configures analog voltage outputs 218S See Paragraph 4 8 SoftCal Initiates SoftCal feature See Paragraph 5 2 Log Setup Sets up data log feature See Paragraph 5 3 1 Log View Views logged data See Paragraph 5 3 3 Log On Off Turns data logging on or off See Paragraph 5 3 2 Local Returns instrument to local operation after remote JEEE 488 operation 218S See Chapter 6 Interface Sets up the IEEE 488 218S or serial computer interface See Chapter 6 Math Sets up math feature Max Min Linear and Filter Also resets Max Min See Paragraph 4 7 Printer Sets up or initiates printer operation See Paragraph 5 4 Escape Exits from a parameter setting sequence and returns to the normal display During entry of numerical settings
153. ting the command and associated parameters Leading zeros and zeros following a decimal point are not needed in a command string but they will be sent in response to a query A leading is not required but a leading is required Remote Operation Omega Model CYD218 Temperature Monitor User s Manual AS i A 6 2 8 Trouble Shooting New Installation 1 Check instrument baud rate 2 Make sure transmit TD signal line from the instrument is routed to receive RD on the computer and vice versa Use a null modem adapter if not 3 Always send terminators 4 Send entire message string at one time including terminators Many terminal emulation programs do not 5 Send only one simple command at a time until communication is established 6 Be sure to spell commands correctly and use proper syntax Old Installation No Longer Working 1 Power instrument off then on again to see if it is a soft failure 2 Power computer off then on again to see if communication port is locked up 3 Verify that baud rate has not been changed on the instrument during a memory reset 4 Check all cable connections Intermittent Lockups 1 Check cable connections and length 2 Increase delay between all commands to 100 ms to make sure instrument is not being over loaded 6 3 IEEE 488 SERIAL INTERFACE COMMANDS Parameter conventions in the command list are lt enable gt A parameter with enable in the name uses these values 0
154. tput gt lt bipolar enable gt lt mode gt lt input gt lt source gt lt high value gt lt low value gt lt manual value gt Returned Nothing Remarks lt output gt Specifies which analog output to configure 1 or 2 lt bipolar enable gt Specifies analog output 0 positive only or 1 bipolar lt mode gt Specifies data the analog output monitors 0 off 1 input 2 manual lt input gt Specifies which input to monitor if lt mode gt 1 1 8 lt source gt Specifies input data 1 Kelvin 2 Celsius 3 sensor units 4 linear equation lt high value gt If lt mode gt 1 this parameter represents the data at which the analog output reaches 100 output lt low value gt If lt mode gt 1 this parameter represents the data at which the analog output reaches 100 output if bipolar or 0 output if positive only lt manual value gt If lt mode gt 2 this parameter is the output of the analog output Example ANALOG 2 0 1 5 1 100 0 0 0 term Sets analog output 2 to monitor Input 5 Kelvin reading with 100 0 K at 100 output 10 0 V and 0 0 K at 0 output 0 0 V ANALOG Query Analog Output Parameters Input ANALOG lt output gt Returned lt bipolar enable gt lt mode gt lt input gt lt source gt lt high value gt lt low value gt lt manual vaiue gt Format n n n n nn nnn nn nnn nn nnn term Remarks See the ANALOG command for parameter descriptions AOU
155. trol Properties Caption Type exit to end program Caption Command Caption Response Text lt blank gt Command1 Name cmdSend Default True Caption Serial Interface Program Interval 10 12 Add code provided in Table 6 4 a Inthe Code Editor window under the Object dropdown list select General Add the statement Public gSend as Boolean b Double Click on cmdSend Add code segment under Private Sub cmdSend_Click as shown in Table 6 4 c Inthe Code Editor window under the Object dropdown list select Form Make sure the Procedure dropdown list is set at Load The Code window should have written the segment of code Private Sub Form_Load Add the code to this subroutine as shown in Table 6 4 d Double Click on the Timer control Add code segment under Private Sub Timer1_TimerQ as shown in Table 6 4 e Make adjustments to code if different Com port settings are being used 13 Save the program 14 Run the program The program should resemble the following m Senal Interface Program 15 Type in a command or query in the Command box as described in Paragraph 6 2 7 3 16 Press Enter or select the Send button with the mouse to send command 17 Type Exit and press Enter to quit Remote Operation 6 11 Omega Model CYD218 Temperature Monitor User s Manual Table 6 4 Visual Basic Serial Interface Program Public gSend As Boolean Global used for Send button state Private Sub cmdSend_Click
156. trumentation should note that liquefied nitrogen and ice point temperatures can vary as much as 10 5 K Use a calibrated standard sensor if possible One point SoftCal calibrations with platinum sensors have no specified accuracy Two point SoftCal calibrations for applications above 70 K are performed at liquid nitrogen 77 35 K and room temperature 305 K Accuracy for the PT 102 PT 103 or PT 111 platinum sensor is 250 mK from 70 K to 325 K 500 mK from 325 K to 1400 mK at 480 K DIN Class A or Class B tolerance Three point SoftCal calibrations are performed at liquid nitrogen 77 35 K room temperature 305 K and high temperature 480 K Accuracy for the PT 102 PT 103 or PT 111 platinum sensor is 250 mK from 70 K to 325 K 250 mK from 325 K to 480 K 5 6 Special Features Omega Model CYD218 Temperature Monitor User s Manual 5 2 5 Creating a SoftCal Calibration Curve Obtain calibration data points Press SoftCal The display to the right appears Use the Data Selection keys to cycle through the curves to use as a basis for calibration Press Enter when the desired curve appears The second display in the setting sequence appears Use the Data Selection keys to cycle through the inputs where the new SoftCal curve stores Press Enter when the desired input appears CAUTION If a user curve already exists at the input location the instrument overwrites it with the new SoftCal user curve The third display in
157. ts are isolated from the instrument ground Connect to the relay contacts through the terminal block see Paragraph 3 3 3 3 3 3 2 Analog Outputs MODEL CYD218S only Analog Output 1 and 2 on the Model CYD218S rear panel are voltage outputs that can be used for monitor applications Figure 3 4 Their most basic function is a temperature monitor where they put out a voltage proportional to temperature Both analog outputs are variable DC voltage sources that can vary from 10 V to 10 V The resolution of the analog output is 1 25 mV or 0 0125 of full scale They can drive a resistive load of no less than 1 kQ The output is short protected so the instrument is not harmed if resistance is too small It is not recommended because the additional load on instrument power supplies causes noise on internal circuits It is not recommended to attach the analog output ground to a ground outside the instrument The output should be read by an instrument with an isolated or differential input wherever possible Connecting to an external ground can cause noise in the analog output voltage or the sensor input measurement If this cannot be avoided try to keep the chassis of the two instruments at the same potential with a ground strap Connect to the analog out contacts through the terminal block see Paragraph 3 3 3 3 3 4 Computer Interfaces Refer to Chapter 6 for details about the IEEE 488 Model CYD218S ONLY and serial computer interfaces See re
158. uous 2 Log event 3 Print Continuous 4 Print Event lt overwrite gt Specifies overwrite mode 0 Do not overwrite data 1 overwrite data lt start gt Specifies start mode 0 Clear 1 Continue lt period gt Specifies period in seconds 1 3600 If mode is Print Continuous minimum period is 10 lt readings gt Specifies number of readings per record 1 8 LOGSET Query Logging Parameters Input LOGSET Returned lt mode gt lt overwrite gt lt start gt lt period gt lt readings gt Format n n n nnnn n term Remarks Returns logging parameters See LOGSET command description of returned parameters LOGVIEW Query a Logged Data Record Input LOGVIEW lt record number gt lt reading number gt Returned lt date gt lt time gt lt reading gt lt status gt lt source gt Format nn nn nn nn nn nn nn nnn nn n term Remarks Returns a single reading from a logged data record lt date gt Date reading was recorded lt time gt Time reading was recorded lt reading gt Reading logged lt status gt Represents the sum of the bit weighting of the reading status flag bits Bit Bit Weighting Status Indicator 0 1 Low Alarm 1 2 High Alarm 2 4 Temperature Over or Under Range 3 8 Sensor Over or Under Range lt source gt Returns data source recorded 1 Kelvin 2 Celsius 3 sensor units 4 linear data 6 26 Remote Operation Omega Model CYD218 Temperature Monitor User s Manual LRDG
159. up A first then repeat process for input group B 7 12 3 Clear Calibration Send the CALCLEAR command to return all calibration constants to their default value Once cleared send the CALSAVE command to save the constants in the E Prom CAUTION Once this step is complete the Model CYD218 sensor inputs must be completely calibrated for proper operation 7 12 4 A D Linearity Calibration PURPOSE To provide ground positive and negative full scale voltages to the input of the A D to allow it to self calibrate linearity COMFIG Attach the precision 2 5 V to the 1 inputs voltage terminals the positive side attaches to the positive terminal Attach the precision 2 5 V to the 2 inputs voltage terminals the negative side attaches to the positive terminal Connect the ground of the voltage reference to the negative input terminals of both inputs Short the positive current source terminal to the negative current source terminal on the 1 and 2 inputs On the 3 and 4 inputs short all 4 terminals together Do not tie the 4 terminals to ground Input group configured for 2 5 V input all inputs of the group are enabied PROCESS Via the interface send the ADCAL command specifying the input group to be calibrated The CALSAVE command must then be issued to save the A D calibration in the E prom Finally the RST command is issued to reload both A Ds with the calibration data stored in the E prom to both A Ds i se ee A ee A Service
160. uracy than their nominal matching to the DIN 43760 curve SoftCal Point 1 SoftCal Point 2 SoftCal Point 3 One two or three calibration data points Liquid Nitrogen Room Temperature High Temperature can be used If using 1 point the algorithm Boiling Point Point Poin shifts the entire curve up or down to meet ta a sa the single point If using 2 points the algorithm has enough information to tilt the curve achieving good accuracy between 0 50 100 150 200 250 300 350 400 450 500 550 600 650 the data points The 3 point extends the EAM improved accuracy across all three points BOS 100K 200 325K nee ere Point Calibration dat intai th Acceptable Temperature Range for Platinum SoftCal Inputs oint 1 Callboration data point at or near the A E boiling point of nitrogen 77 35 K Figure 5 2 SoftCal Temperature Ranges for Platinum Sensors Temperatures outside 50 K to 100 K are not allowed Point 2 Calibration data point near room temperature 305 K Temperatures outside 200 K to 350 K are not allowed Point 3 Calibration data point at a higher temperature 480 K Temperatures outside 400 K to 600 K are not allowed 5 2 4 SoftCal Accuracy with Platinum Sensors NOTE A SoftCal calibration is only as good as the accuracy of the calibration points The accuracies listed for SoftCal assume 0 05 K for 77 35 liquid nitrogen K and 305 K room temperature points Users performing a SoftCal with Omega Engineering ins
161. ure points and 0 01 K for 4 2 K liquid helium Users performing the SoftCal with silicon diodes and Omega Engineering instruments should note that liquefied nitrogen and ice point temperatures can vary as much as 10 5 K Use a calibrated standard sensor if possible The boiling point of liquid helium though quite accurate is affected by atmospheric pressure One point SoftCal calibrations for applications under 30 K are performed at liquid helium 4 2 K Resultant accuracy for the CYD SD7 diode is 10 5 K from 2 K to lt 30 K no change above 30 K Two point SoftCal calibrations for applications above 30 K are performed at liquid nitrogen 77 35 K and room temperature 305 K Resultant accuracy for the CY7 SD SD 13 diode sensor is 1 0 K from 2 K to lt 30 K no change below 30 K 0 25 K from 30 K to lt 60 K 0 25 K from 345 K to lt 375 K 0 15 K from 60 K to lt 345 K 1 0 K from 375 to 475 K Three point SoftCal calibrations are performed at liquid helium 4 2 K liquid nitrogen 77 35 K and room temperature 305 K Resultant accuracy for the CY7 SD SD 13 diode sensor is 10 5 K from 2 K to lt 30 0 25 K from 30 K to lt 60 K 0 25 K from 345 K to lt 375 K 0 15 K from 60 K to lt 345 K 1 0 K from 375 to 475 K 5 2 3 SoftCal and Platinum Sensors The platinum sensor is a well accepted temperature standard because of its consistent and repeatable temperature response above 30 K SoftCal gives platinum sensors better acc
162. using 24 hour format lt MM gt Specifies month Valid entries are 1 12 lt DD gt Specifies day Valid entries are 1 31 lt YY gt Specifies year Valid entries are 00 99 lt HH gt Specifies hour Valid entries are 0 23 lt mm gt Specifies minutes Valid entries are 0 59 lt SS gt Specifies seconds Valid entries are 0 59 Example DATETIME 2 3 99 15 30 O term Sets date to February 3 1999 time to 3 30pm DATETIME Query Date and Time Input DATETIME Returned lt MM gt lt DD gt lt YY gt lt HH gt lt mm gt lt SS gt Format nn nn nn nn nn nn term Remarks Returns date and time See the DATETIME command for parameter descriptions DFLT Set to Factory Defaults Input DFLT 99 Returned Nothing Remarks Sets all configuration values to factory defaults and resets the instrument The 99 is required to prevent accidentally setting the unit to defaults Does not clear user curves or instrument calibration DISPFLD Configure Display Parameters Input DSPFLD lt location gt lt input gt lt source gt Returned Nothing Remarks Configures the display parameters lt location gt Specifies display location to configure 1 8 lt input gt Specifies input to display in the display location 0 8 0 none lt source gt Specifies input data to display 1 Kelvin 2 Celsius 3 sensor units 4 linear data 5 minimum data 6 maximum data Example DSPFLD 2 4 1 term
163. uts Analog Outeut 1 Select with A BEirolor Mode OFF reading Several parameters associated with this mode allow flexibility After selecting Input mode the screen to the right appears Use the Data Selection keys to select the sensor input 1 8 that the selected analog output follows Press Enter when the desired input appears 4 8 Operation Omega Model CYD218 Temperature Monitor User s Manual gd The second display in the Input mode setting sequence appears Use the Data Selection keys to select the appropriate source for the selected sensor input K Kelvin temperature reading from input C Celsius temperature reading from input Sensor Sensor units reading from input Linear Linear equation data from input Press Enter when the desired unit appears The third display in the Input mode setting sequence appears Use the Data Selection keys to turn Bipolar Mode On or Off then press Enter Bipolar allows the analog output to set a negative voltage On Allows a range from 10V to 10V Off Allows a range from 0 V to 10V The fourth display in the Input mode setting sequence appears Use the number keys to input a value corresponding to the lowest setting of the analog output then press Enter For bipolar operation this value corresponds to 10 V out for unipolar operation it corresponds to 0 V out Resolution is 5 digits The fifth display in the Input mode setting sequence appears Use the number keys to input a value co
164. ve Entry Cory Curve from Select With A DT 47B Use the A or Y key to select the curve number to copy from Once the curve number is selected press the Enter key You will see the following message Curve Entry Cory Curve to Select With A Input 1 User Use the A or Y key to select the input number 1 thru 8 of the curve to copy to Press the Enter key to copy the curve You now return to the normal display 5 4 Special Features Omega Model CYD218 Temperature Monitor User s Manual 5 2 SOFTCAL The Model CYD218 performs inexpensive sensor calibrations with two algorithms called SoftCal These algorithms work with DT 400 Series Silicon Diode sensors and Platinum Sensors They create a new temperature response curve from the standard curve and known data points entered by the user The new curve loads into one of the eight user curve locations These paragraphs describe the data points needed from the user and the expected accuracy of the resulting curves Both DT 400 and Platinum SoftCal algorithms use an existing standard curve in the Model CYD218 The new curve will be named SCAL DT or SCAL PT When calibration is complete the user must select the new curve for the input the Model CYD218 does not automatically choose the newly generated curve for any input Each algorithm operates with one two or three calibration points The range of improved accuracy increases with more points The calibration points are normally
165. xternal damage Make all claims for damage apparent or concealed or partial loss of shipment in writing to Omega Engineering within five 5 days from receipt of goods If damage or loss is apparent please notify the shipping agent immediately Open the shipping containers Use the packing list included with the system to verify receipt of the instrument sensor accessories and manual Inspect for damage Inventory all components supplied before discarding any shipping materials If there is freight damage to the instrument file proper claims promptly with the carrier and insurance company and notify Omega Engineering Notify Omega Engineering immediately of any missing parts Omega Engineering cannot be responsible for any missing parts unless notified within 60 days of shipment See the standard Omega Engineering Warranty on the A Page immediately behind the title page 3 2 REPACKAGING FOR SHIPMENT To return the Model CYD218 sensor or accessories for repair or replacement obtain a Return Goods Authorization RA number from Technical Service in the United States or from the authorized sales service representative from which the product was purchased Instruments may not be accepted without a RA number When retuming an instrument for service Omega Engineering must have the following information before attempting any repair 1 Instrument model and serial number 2 User name company address and phone number 3 Malfunction symptom
166. y Self Test Wait To Continue Set Alarm Query Alarm Query Alarm Status Set Audible Alarm Query Audible Alarm Parameters Reset Alarms Set Analog Outputs Query Analog Outputs Query Analog Output Data Set Serial Interface Baud Rate Query Serial Interface Baud Rate Query Celsius Reading Erase a Curve Set Curve Header Query Curve Header Set Curve Point Query Curve Point Set Date and Time Query Date and Time Set To Factory Defaults Set Display Field Query Display Field Set Filter Command FILTER IEEE IEEE INCRV INCRV INPUT INPUT INTYPE INTYPE KEYST KRDG LINEAR LINEAR LOCK LOCK LOG LOG LOGNUM LOGREAD LOGREAD LOGSET LOGSET LOGVIEW LRDG MNMX MNMX MNMXRDG MNMXRST MODE MODE RDGST RELAY RELAY RELAYST SCAL SRDG Function Query Filter Set IEEE Interface Query IEEE Interface Set Input Curve Query Input Curve Set Input Control Query Input Control Set Input Type Query Input Type Query Keypad Status Query Kelvin Reading Set Linear Equation Query Linear Equation Set Lock out and Code Query Lock out and Code Turns Logging On and Off Query Logging Status Query Last Log Record Stored Set Log Records Query Log Record Parameters Configure Logging Parameters Query Logging Parameters Query Logged Data Record Query Linear Equation Input Data Set Max Min Query Max Min Query Max Min Data Reset Min Max Function Set Local Remote Mode Query Local Remot

Omega Engineering CYD218 User's Manual

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