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9127 User`s Guide.vp

1. 0 186 300 0 150 0 1 0 00385 0 0038544 Figure 9 Calibration Example 12 Maintenance The calibration instrument has been designed with the utmost care Ease of operation and simplicity of maintenance have been a central theme in the product development Therefore with proper care the in strument should require very little maintenance Avoid operating the instrument in an oily wet dirty or dusty environment If the outside of the instrument becomes soiled it may be wiped clean with a damp cloth and mild detergent Do not use harsh chemicals on the surface which may damage the paint It is important to keep the well of the calibrator clean and clear of any foreign matter Do not use fluid to clean out the well The dry well calibrator should be handled with care Avoid knocking or dropping the calibrator For dry wells with removable probe sleeves the sleeves can become covered with dust and carbon material If the buildup becomes too thick it could cause the sleeves to become jammed in the wells Avoid this build up by periodically buffing the sleeves clean using a Scotchbrite pad or emery cloth If a sleeve should be dropped examine the sleeve for deformities be fore inserting it in the well If there is any chance of jamming the sleeve in the well file or grind off the protuberance Do not slam the probe stems into the well This type of
2. 51 10 1 2 Comparison Calibration 51 10 2 Dry Well Characteristics 52 10 2 1 Vertical Gradient 52 10 2 2 Fully Loading the Calibrator 53 10 2 3 Stabilization and Accuracy 53 11 Calibration Procedure 55 11 1 Calibration Points 55 11 2 Measuring the Set point Error 55 11 3 Computing R0 and ALPHA 56 11 4 Calibration Example 56 12 Maintenance 59 13 Troubleshooting 61 13 1 Troubleshooting 61 13 2 Comments 62 13 2 1 EMC Directive 62 13 2 2 Low Voltage Directive Safety 62 13 3 Wiring Diagram 63 iii iv Figures and Tables Table1 International Electrical Symbols 1 Table
3. 42 8 16 2 CO and CG 42 ii 8 16 3 SCO 42 9 Digital Communication Interface 43 9 1 Serial Communications 43 9 1 1 Wiring 43 9 1 2 Setup 43 9 1 2 1 BAUD Rate 43 9 1 2 2 Sample Period 44 9 1 2 3 Duplex Mode 45 9 1 2 4 Linefeed 45 9 1 3 Serial Operation 45 9 2 IEEE 488 Communication 45 9 2 1 Setup 45 9 2 1 1 IEEE 488 Interface Address 46 9 2 2 IEEE 488 Operation 46 9 3 Interface Commands 46 10 Test Probe Calibration 51 10 1 Calibration Methods 51 10 1 1 Direct Calibration
4. 36 8 12 1 R0 36 8 12 2 ALPHA 36 8 12 3 DELTA 37 8 13 Operating Parameters 37 8 13 1 Temperature Scale Units 37 8 13 2 Cut out Reset Mode 37 8 13 3 Approach 38 8 13 4 Soak Stability 38 8 14 Serial Interface Parameters 38 8 14 1 BAUD Rate 38 8 14 2 Sample Period 39 8 14 3 Duplex Mode 39 8 14 4 Linefeed 40 8 15 IEEE 488 Parameters 40 8 15 1 IEEE 488 Address 40 8 15 2 Termination 41 8 16 Calibration Parameters 41 8 16 1 CTO
5. 25 8 4 2 Scan Rate 25 8 5 Temperature Display Hold 26 8 5 1 Hold Temperature Display 26 8 5 2 Mode Setting 26 8 5 3 Scan Hold 27 8 5 4 Switch Wiring 28 8 5 5 Switch Test Example 28 8 6 Ramp and Soak Program Menu 29 8 6 1 Number of Program Set points 30 8 6 2 Set points 30 8 6 3 Program Soak Time 31 8 6 4 Program Function Mode 31 8 6 5 Program Control 32 8 7 Secondary Menu 32 8 8 Heater Power 32 8 9 Proportional Band 33 8 10 Cut out 34 8 11 Controller Configuration 36 8 12 Probe Parameters
6. Model Number Serial Number Voltage 4 Manual Rev 050801 9127 1 Before You Start 2 Introduction The Hart Scientific Model 9127 dry well calibrator Figure 1 may be used as a portable instrument or bench top temperature calibrator for cal ibration of thermocouple and RTD temperature probes Calibrations may be done over a range of 35 to 600 C The temperature display and setability resolution are to 0 01 degrees The dry well calibrator features Rapid heating and cooling Interchangeable aluminum bronze probe sleeves Convenient carry handle Serial Interface Hart Scientific Manual Rev 050801 5 2 Introduction SET DOWN UP EXIT 9127 WARNING THIS AREA IS HOT 3 4 1 2 Figure 1 Top View of 9127 Optional IEEE 488 interface capability Built in programmable features include Ramp and Soak Temperature scan rate control Temperature hold The temperature is accurately controlled by Hart s hybrid analog digital controller with serial and an optional IEEE 488 ports The controller uses a precision platinum RTD as a sensor and controls the well temperature with a solid state relay triac driven heater The LED front panel continuously shows the current well temperature The temperature may be easily set with the control buttons to any desired temperature within the specified range The calibrator s multiple fault pro tection devices ins
7. Read proportional band setting pr op band pr pb 999 9 pb 15 9 Set proportional band to n pr op band n pr 8 83 Depends on Configuration Read cutout setting c utout c c 9999 C or F c 620 C in Set cutout setting c utout n r eset Set cutout to n degrees c utout n c 500 Temperature Range Reset cutout now c utout r eset c r Read heater power duty cycle po wer po p 9999 po 1 Ramp and Soak Menu Read number of programmable set points pn pn pn 9 pn 2 Set number of programmable set points to n pn n pn 4 1 to 8 Read programmable set point number n psn ps3 psn 9999 99 C or F ps1 50 00 C Set programmable set point number n to n psn n ps3 50 1 to 8 Instrument Range Read program set point soak time pt pt ti 999 ti 5 Set program set point soak time to n minutes pt n pt 5 0 to 500 Read program control mode pc pc prog OFF or ON prog OFF Set program control mode pc g o s top c ont GO or STOP or CONT Table 5 Interface Commands 48 Manual Rev 050801 9127 9 Digital Communication Interface Command Description Command Format Command Example Returned Returned Example Acceptable Values Start program pc g o pc g Stop program pc s top pc s Continue program pc c ont pc c Read program function pf pf pf 9 pf 3 Set program function to n pf n pf 2 1 to 4 Configuration Menu Probe Menu Read R0 calibrati
8. to save the new set point value The other set points can also be set in the same manner Once the set points are programmed as desired press EXIT to continue E Continue to next menu function 30 Manual Rev 050801 9127 8 Controller Operation 8 6 3 Program Soak Time The next parameter in the program menu is the soak time This is the time in minutes for which each of the program set points will be main tained after settling before proceeding to the next set point The duration is counted from the time the temperature settles to within a specified sta bility The stability requirement can be set in the parameter menu as ex plained in Section 8 13 4 The default is 0 1 C Pt 15 Soak time in minutes Use the UP or DOWN buttons to change the time Pt 5 New soak time Press SET to continue S Save new setting 8 6 4 Program Function Mode The next parameter is the program function or cycle mode There are four possible modes which determine whether the program will scan up from set point 1 to n only or both up and down from set point n to 1 and also whether the program will stop after one cycle or repeat the cycle in definitely Table 4 below shows the action of each of the four program mode settings Pf 1 Program mode Use the UP or DOWN buttons to change the mode Pf 4 New mode Press SET to continue Hart Scientific Manual Rev 050801 31 8 Controll
9. CNG 9122 9124 amp 9126 WITHIN 1 OHM IN THE FOLLOWING UNITS 6A FOR 230 VAC VERSION 10A FOR 115 VAC VERSION 9123 3A FOR 230 VAC VERSION 5A FOR 115 VAC VERSION EARTH BLK RED GRN 9124 ONLY 9126 ONLY J5 J4 ANALOG PCB BLK RED OPTIONAL IEEE 488 J1 J2 J1 J3 DISPLAY IEEE 488 J4 J1 DIGITAL BOARD DISPLAY J6 HOLD TEMPERATURE INTERFACE SERIAL 8 7 2 3 5 CS RS R T G J3 GRN CHASSIS SENSOR CONTROL TC CUTOUT PC BOARD SWITCH POWER TRIAC FILTER P2 P1 H2 H1 HTR IN AC PWR CNTL G P2 P1 H N G CTL FAN FAN EXT 5 WHT WHT BLK ORG VIO GRY ORG RELAY HEATERS 8 7 9 4 6 B A AC IN 3 HEATERS SHOULD BE MATCHED IN RESISTANCE 1 ALL WIRE IS STRANDED 18 GUAGE COPPER NOTES POWER RELAY J8 TRIAC J6 G AC J1 PT100 J2 TC J7 T T MT1 G MT2 801 763 1600 84003 9775 AMERICAN FORK UTAH DATE APPROVAL BY DESCRIPTION LTR REVISIONS TITLE SHEET OF SCALE RELEASE DRAWN DATE APPROVAL SCIENTIFIC HART REV DWG NO AO21 2S09 Figure 10 Wiring Diagram
10. EXIT EXIT EXIT EXIT EXIT EXIT EXIT EXIT EXIT EXIT EXIT EXIT EXIT EXIT EXIT EXIT SET SET SET SET SET SET SET SET SET SET SET SET SET SET SET SET SET EXIT SET EXIT SET EXIT SET EXIT SET EXIT SET EXIT SET EXIT SET EXIT Probe Menu R0 DELTA ALPHA Adj R0 Adj DELTA Adj ALPHA SET EXIT Serial Interface Menu BAUD Rate Adjust BAUD Rate Sample Period Adj Sample Period Duplex Mode Adj Duplex Mode Linefeed Adjust Linefeed EXIT EXIT EXIT EXIT EXIT Units Cutout Reset Mode Approach Stability Adjust Units Adj Cutout Reset Mode Adjust Approach Adjust Stability X 5 Calibration Menu CTO Adjust CTO C0 Adjust C0 CG SCO Adjust CG Adjust SCO SET EXIT EXIT EXIT EXIT SET SET SET SET SET EXIT SET EXIT SET EXIT SET EXIT SET EXIT X 5 DO NOT CHANGE THESE VALUES SEE MANUAL IEEE 488 Option Installed SET EXIT SET EXIT SET EXIT SET EXIT SET EXIT SET EXIT EXIT SET UP SET EXIT EXIT EXIT EXIT SET SET SET SET Display Power Set Proportional Band Set Cutout Temp Configuration Menu SET EXIT EXIT SET SET SET Program Menu Number of Setpoints Select Setpoint Select Setpoint Soak Time EXIT SET EXIT Program Function Mode Program
11. can leak into the calibrator causing damage to the calibrator or binding and damage to your probe 10 1 2 Comparison Calibration Comparison calibration involves testing a probe against a similar refer ence probe The advantage to this method is that better accuracy can be achieved since errors due to dry well inaccuracy stem effect and drift can be reduced Uniformity between the two holes at the same depth is typically 0 05 C After inserting the probes to be calibrated allow sufficient time for the probes to settle and the temperature of the dry well to stabilize It is best if both the reference probe and the probe under test are the same size and construction Using probes with different lengths diame ters and materials will have different stem effects causing an unknown Hart Scientific Manual Rev 050801 51 10 Test Probe Calibration temperature difference All dry wells have horizontal and vertical gradi ents that change with temperature This is an unknown variable which can be factored out if probes are the same type length diameter and material Probes should be inserted to the same depth in the well The following procedure can be used to calibrate a probe against a refer ence while reducing error due to temperature gradients between wells Place the reference probe in one well the reference probe Place the probe to be calibrated the unit under test UUT in another well With the ref
12. DO NOT turn off the unit at temperatures higher than 100 C This could create a hazardous situation Select a set point less than 100 C and allow the unit to cool be fore turning it off DO NOT operate this unit without a properly grounded properly polarized power cord DO NOT connect this unit to a non grounded non polarized outlet 2 Manual Rev 050801 9127 1 Before You Start Table 2 Warnings and Cautions HIGH VOLTAGE is used in the operation of this equipment SEVERE INJURY OR DEATH may result if personnel fail to ob serve safety precautions Before working inside the equipment turn power off and disconnect power cord DO NOT use this unit for any application other than calibration work DO NOT use this unit in environments other than those listed in the user s manual DO NOT turn the unit upside down with the inserts in place the inserts will fall out of the unit DO NOT operate near flammable materials Use of this instrument at HIGH TEMPERATURES for extended periods of time requires caution Completely unattended operation is not recommended for safety reasons Always replace the fuse with one of the same rating voltage and type Overhead clearance is required DO NOT place unit under a cabinet or other structure If the instrument is used in a manner not in accordance with the equipment design the operation of the dry well may be im paired or safety hazards may arise The block vent may b
13. 1 Before You Start Symbol Description AC AC DC Battery CE DC Double Insulated Electric Shock Fuse PE Ground Hot Surface Read the User s Manual Off On Table1 International Electrical Symbols 1 2 Safety Information Use the instrument only as specified in this manual Otherwise the pro tection provided by the instrument may be impaired Refer to the safety information in Table 1 The following definitions apply to the terms Warning and Caution Warning identifies conditions and actions that may pose hazards to the user Caution identifies conditions and actions that may damage the in strument being used WARNINGS To avoid possible electric shock or personal injury follow these guidelines BURN HAZARD Do Not touch the well access surface of the unit Refer to Figure 1 on page 5 The temperature of the well access 1 is the same as the actual temperature shown on the display 2 e g if the unit is set at 600 C and the display reads 600 C the well is at 600 C The top sheet metal 3 of the dry well may exhibit ex treme temperatures for areas close to the well access 4 The air over the well can reach temperatures greater than 200 C Probes and inserts may be hot They should only be inserted and removed from the unit when the unit is set at temperatures less than 50 C Use extreme care when removing hot inserts
14. Hart Scientific Do not drop the sleeve into the well Doing so may shock and damage the control sensor Turn on the power to the calibrator by toggling the power switch on The fan should begin blowing air through the instrument and the controller display should illuminate after 3 seconds After a brief self test the con troller should begin normal operation If the unit fails to operate please check the power connection The display will begin to show the well temperature and the well heater will start operating to bring the temperature of the well to the set point temperature Hart Scientific Manual Rev 050801 13 5 Quick Start 5 3 Power Plug the dry well power cord into a mains outlet of the proper voltage frequency and current capability Typically this will be 115 VAC 10 50 60 Hz or 230 VAC 10 50 60 Hz Turn the dry well on using the rear panel POWER switch The dry well will turn on and begin to heat to the previously programmed temperature set point The front panel LED display will indicate the actual dry well temperature 5 4 Setting the Temperature Section 8 3 explains in detail how to set the temperature set point on the calibrator using the front panel keys The procedure is summarized here 1 Press SET twice to access the set point value 2 Press UP or DOWN to change the set point value 3 Press SET to program in the new set point 4 Press EXIT to return to the
15. Rev 050801 43 9 Digital Communication Interface choose to set the BAUD rate The current BAUD rate value will then be displayed The BAUD rate may be programmed to 300 600 1200 or 2400 BAUD The BAUD rate is pre programmed to 1200 BAUD Use UP or DOWN to change the BAUD rate value Press SET to set the BAUD rate to the new value or EXIT to abort the operation and skip to the next parameter in the menu 9 1 2 2 Sample Period The sample period is the next parameter in the menu and prompted with SAmPLE The sample period is the time period in seconds between tem perature measurements transmitted from the serial interface For exam ple if the sample rate is set to 5 the instrument transmits the current measurement over the serial interface approximately every five seconds The automatic sampling is disabled with a sample period of 0 Press SET to choose to set the sample period Adjust the period with UP or DOWN and then use SET to set the sample rate to the displayed value 44 Manual Rev 050801 9127 9 Digital Communication Interface RS 232 Cable Wiring for IBM PC and Compatibles 1 NC 2 RxD 3 TxD 4 NC 5 GND 6 NC 7 RTS 8 CTS 9 NC 2 TxD 3 RxD 4 RTS 5 CTS 6 DSR 7 GND 8 DTD 20 DTR Instrument Connector DB 9 Pin Computer DTE Connector DB 25 Pin 1 NC 2 RxD 3 TxD 4 NC 5 GND 6 NC 7 RTS 8 CTS 9 NC 1 DCD 2 RxD 3 TxD 4 DTR 5 GND 6 DSR
16. menu is the scan rate The scan rate can be set from 1 to 100 C min The maximum scan rate however is actu ally limited by the natural heating or cooling rate of the instrument This is often less than 100 C min especially when cooling The scan rate function appears in the main menu after the scan control function The scan rate units are in degrees per minute degrees C or F depending on the selected units Sr 10 0 Scan rate in C min Press UP or DOWN to change the scan rate Sr 2 0 New scan rate Press SET to accept the new scan rate and continue S Accept scan rate Hart Scientific Manual Rev 050801 25 8 Controller Operation 8 5 Temperature Display Hold The 9127 has a display hold function which allows action of an external switch to freeze the displayed temperature and stop the set point from scanning This feature is useful for testing thermal switches and cut outs This section explains the functions available for operating the Display Hold feature An example follows showing how to set up and use the hold feature to test a switch 8 5 1 Hold Temperature Display When the hold feature is enabled you can easily switch the display be tween the normal temperature display and the hold temperature display by simply pressing the UP or DOWN buttons The hold temperature display shows the hold temperature on the right and the switch status on the left For the status c mean
17. on lf eed on lf on Set serial linefeed mode to off lf eed of f lf of Calibration Menu WARNING changing the following calibration values may change the accuracy of the instrument Read C0 calibration parameter c0 c0 c0 9 c0 0 Set C0 calibration parameter to n c0 n c0 0 999 9 to 999 9 Read CG calibration parameter cg cg cg 999 99 cg 406 25 Set CG calibration parameter to n cg n cg 406 25 999 9 to 999 9 Interface Commands continued Hart Scientific Manual Rev 050801 49 9 Digital Communication Interface Command Description Command Format Command Example Returned Returned Example Acceptable Values These commands are only used for factory testing Read software cutout mode sco sco sco ON or OFF sco ON Set software cutout mode sco ON OF F ON or OFF Set software cutout mode on sco ON sco on Set software cutout mode off sco OF F sco off Miscellaneous not on menus Read firmware version number ver sion ver ver 9999 9 99 ver 9127 3 54 Read structure of all commands h elp h list of commands Legend Optional Command data Alternate characters or data Returns either information n Numeric data supplied by user may be entered in decimal or exponential notation 9 Numeric data returned to user x Character data returned to user Note When DUPLEX is set to FULL and a command is sent to READ the command is returned foll
18. point value C 420 00 New set point value When the desired set point value is reached press SET to accept the new value and access the temperature scale units selection If EXIT is pressed instead then any changes made to the set point will be ignored S Accept new set point value 8 3 3 Temperature Scale Units The temperature scale units of the controller maybe set by the user to degrees Celsius C or Fahrenheit F The units are used in displaying the well temperature set point and proportional band Press SET after adjusting the set point value to change display units Un C Scale units currently selected Press UP or DOWN to change the units Un F New units selected 24 Manual Rev 050801 9127 8 Controller Operation 8 4 Scan The scan rate can be set and enabled so that when the set point is changed the dry well will heat or cool at a specified rate degrees per minute until it reaches the new set point With the scan disabled the dry well will heat or cool at the maximum possible rate 8 4 1 Scan Control The scan is controlled with the scan on off function that appears in the main menu after the set point function ScAn OFF Scan function off Press UP or DOWN to toggle the scan on or off ScAn On Scan function on Press SET to accept the present setting and continue S Accept scan setting 8 4 2 Scan Rate The next function in the main
19. see Section 8 4 1 3 Set the scan rate to a low value say 1 0 C min see Section 8 4 2 If the scan rate is too high you may lose accuracy because of transient temperature gradients If the scan rate is too low the duration of the test may be longer than is necessary You may need to experiment to find the best scan rate 4 Set the hold mode to automatic see Section 8 5 2 5 Set the scan hold to ON see Section 8 5 3 6 Set the number of program set points to 2 in the program menu see Section 8 6 1 7 Set the first program set point to a value below the expected lower switch temperature say 40 C in the program menu see Section 8 6 2 8 Set the second program set point to a value above the expected upper switch temperature say 90 C 9 Set the program soak time to allow enough time to collect a number of data points say 2 minutes see Section 8 6 3 28 Manual Rev 050801 9127 8 Controller Operation 10 Set the program function to mode 4 so that the instrument will cycle between the 2 set points repeatedly See Section 8 6 4 11 Start the program see Section 8 6 5 12 Collect data on a computer connected to the RS 232 port Refer to Section 9 for instructions on configuring the RS 232 communications in terface The data may appear as shown in Figure 6 The maxima and minima are the switch temperatures 8 6 Ramp and Soak Program Menu The ramp and soak program feature of the 9127 allow
20. temperature display When the set point temperature is changed the controller will switch the well heater on or off to raise or lower the temperature The cycle indica tor a two color LED will also indicate on red and heating or off green and cooling The displayed well temperature will gradually change until it reaches the set point temperature The well may require 5 to 12 minutes to reach the set point depending on the span Another 5 to 10 minutes is required to settle within 0 1 C of the set point Ultimate stability may take 20 to 30 minutes more of stabilization time 5 5 Changing Display Units The 9127 can display temperature in Celsius or Fahrenheit The temper ature units are shipped from the factory set to Celsius To change to Fahrenheit or back to Celsius perform the following 1 Press the SET and EXIT button simultaneously 2 Press the SET button four times 3 Press the UP button 4 Press the SET button to display the units 5 Press the SET button to adjust the units 6 Press the UP or DOWN buttons to change the units 7 Press the SET button to store the change 14 Manual Rev 050801 9127 5 Quick Start 6 Parts and Controls The user should become familiar with the dry well calibrator and its parts 6 1 Back Panel The Back Panel is shown in Figure 2 on page 15 Power Cord At the rear of the cali brator is the removable power cord
21. that the dry well appears to function abnormally this section may help to find and solve the problem Several possible problem condi tions are described along with likely causes and solutions If a problem arises please read this section carefully and attempt to understand and solve the problem If the dry well seems faulty or the problem cannot oth erwise be solved contact Hart Scientific Customer Service for assistance 1 801 763 1600 Be sure to have the instrument model number serial number and voltage available Problem Causes and Solutions Incorrect temperature reading Power the unit on and watch the display If the first num ber displayed is less than 0005 the unit has been re initialized Initialize the system by performing the Master Reset Sequence as described in the problem Controller locks up The display is off Check the fuses Check that the power cord is plugged in and connected to the unit Red LED on display is blank Check that there is power to the unit The unit heats slowly Check the Scan and Scan Rate settings The Scan may be on with the Scan Rate set low An o or c is dis played at the left of the display The external switch is open causing the displayed tem perature to be frozen and keeping the set point from scanning Turn the Switch Test off by pressing the DOWN button on the front panel Controller locks up Initialize the system by performing the Master Reset
22. 0801 39 8 Controller Operation dUP HALF New duplex mode setting 8 14 4 Linefeed The final parameter in the serial interface menu is the linefeed mode This parameter enables on or disables off transmission of a linefeed character LF ASCII 10 after transmission of any carriage return The linefeed parameter is indicated by LF Serial linefeed parameter Press SET to access the linefeed parameter LF On Current linefeed setting The mode may be changed using UP or DOWN and pressing SET LF OFF New linefeed setting 8 15 IEEE 488 Parameters The calibrator may optionally be fitted with an IEEE 488 GPIB interface In this case the user may set the interface address and termination within the IEEE 488 parameter menu This menu does not appear on instru ments not fitted with the interface The menu is indicated by IEEE IEEE 488 parameters menu Press SET to enter the menu 8 15 1 IEEE 488 Address The IEEE 488 interface must be configured to use the same address as the external communicating device The address is indicated by AddrESS IEEE 488 interface address Press SET to access the address setting Add 22 Current IEEE 488 interface address Adjust the value with UP or DOWN and then use SET to set the ad dress to the displayed value 40 Manual Rev 050801 9127 8 Controller Operation Add 15 New IEEE 488 interface address 8 15 2 T
23. 2 IEEE 488 Operation Commands may now be sent via the IEEE 488 interface to read or set the temperature or access other controller functions All commands are ASCII character strings and are terminated with a carriage return CR ASCII 13 Interface commands are listed below 9 3 Interface Commands The various commands for accessing the calibrator functions via the digi tal interfaces are listed in this section see Table 5 These commands are used with both the RS 232 serial interface and the IEEE 488 GPIB interface In either case the commands are terminated with a carriage re turn character The interface makes no distinction between upper and lower case letters hence either may be used Commands may be abbre viated to the minimum number of letters which determines a unique com mand A command may be used to either set a parameter or display a parameter depending on whether or not a value is sent with the com mand following a character For example s lt CR gt returns the current set point and s 150 00 lt CR gt sets the set point to 150 00 degrees In the following list of commands characters or data within brackets and are optional for the command A slash denotes alternate characters or data Numeric data denoted by n may be entered in dec imal or exponential notation Characters are shown in lower case al though upper case may be used Spaces may be added within command
24. 2 Warnings and Cautions 2 Figure 1 Top View of 9127 5 Figure 2 Back Panel 15 Figure 3 Front Panel 17 Table 3 Available Inserts 18 Figure 4 Inserts available for the 9127 block assembly 18 Figure 5 Controller Operation Flowchart 22 Figure 6 Switch Test Data 29 Table 4 Program mode setting actions 31 Figure 7 Well temperature fluctuation at various proportional band settings 34 Figure 8 Serial Cable Wiring Diagram 44 Table 5 Interface Commands 47 Table 5 Interface Commands continued 48 Table 5 Interface Commands continued 49 Figure 9 Calibration Example 57 Figure 10 Wiring Diagram 63 1 Before You Start 1 1 Symbols Used Table 1 lists the symbols used on the instrument or in this manual and the meaning of each symbol Hart Scientific Manual Rev 050801 1
25. 7 RTS 8 CTS 9 NC Instrument Connector DB 9 Pin Computer DTE Connector DB 9 Pin Figure 8 Serial Cable Wiring Diagram 9 1 2 3 Duplex Mode The next parameter is the duplex mode indicated with dUPL The du plex mode may be set to half duplex HALF or full duplex FULL With full duplex any commands received by the thermometer via the serial in terface are immediately echoed or transmitted back to the device of ori gin With half duplex the commands will be executed but not echoed The default setting is full duplex The mode may be changed using UP or DOWN and pressing SET 9 1 2 4 Linefeed The final parameter in the serial interface menu is the linefeed mode This parameter enables On or disables OFF transmission of a line feed character LF ASCII 10 after transmission of any carriage return The default setting is with linefeed on The mode may be changed using UP or DOWN and pressing SET 9 1 3 Serial Operation Once the cable has been attached and the interface set up properly the controller will immediately begin transmitting temperature readings at the programmed rate The serial communications uses 8 data bits one stop bit and no parity The set point and other commands may be sent via the serial interface to set the temperature set point and view or program the various parameters The interface commands are discussed in Section 9 3 All
26. 9127 Dry wellCalibrator User sGuide Rev 050801 Rev 050801 Copyright 2000 Hart Scientific Inc 799 E Utah Valley Drive American Fork Utah 84003 9775 Telephone 801 763 1600 Fax 801 763 1010 Internet http www hartscientific com E mail support hartscientific com Table of Contents 1 Before You Start 1 1 1 Symbols Used 1 1 2 Safety Information 2 1 3 Customer Service Information 4 2 Introduction 5 3 Specifications and Environmental Conditions 7 3 1 Specifications 7 3 2 Environmental Conditions 8 3 3 Warranty 8 4 Safety Guidelines 11 5 Quick Start 13 5 1 Unpacking 13 5 2 Set up 13 5 3 Power 14 5 4 Setting the Temperature 14 5 5 Changing Display Units 14 6 Parts and
27. Control EXIT EXIT EXIT SET SET SET SET Reset Cutout Select Setpoint Adjust Setpoint EXIT EXIT EXIT EXIT SET SET SET SET Scan On Off Display Hold Mode Scan Rate Scan Hold Cutout Active Display Temperature EXIT SET Reset Cutout Cutout Active SECONDARY FUNCTIONS EXIT SET Adjust Units Figure 5 Controller Operation Flowchart When the cut out is active and the cut out mode is set to manual reset then the display will flash cut out until the user resets the cut out To ac cess the reset cut out function press the SET button S Access cut out reset function The display will indicate the reset function rESEt Cut out reset function Press SET once more to reset the cut out S Reset cut out This will also switch the display to the set temperature function To return to displaying the temperature press the EXIT button If the cut out is still in the over temperature fault condition the display will continue to flash cut out The well temperature must drop a few degrees below the cut out set point before the cut out can be reset 8 3 Temperature Set point The temperature set point can be set to any value within the range and with resolution as given in the specifications Be careful not to exceed the safe upper temperature limit of any device inserted into the well The safety cut out should be properly adjuste
28. Controls 15 6 1 Back Panel 15 6 2 Front Panel 16 6 3 Constant Temperature Block Assembly 17 6 3 1 Constant Temperature Block 17 6 3 2 Probe Sleeves and Tongs 18 7 General Operation 19 7 1 Calibrator Set Up 19 7 2 Switch to 230 V Operation 19 7 3 Setting the Temperature 19 7 4 Calibrating Probes 20 8 Controller Operation 21 8 1 Well Temperature 21 i 8 2 Reset Cut out 21 8 3 Temperature Set point 23 8 3 1 Programmable Set points 23 8 3 2 Set point Value 24 8 3 3 Temperature Scale Units 24 8 4 Scan 25 8 4 1 Scan Control
29. DOWN UP EXIT 9127 Figure 3 Front Panel Caution The block vent may be very hot due to the fan blowing upward 6 3 2 Probe Sleeves and Tongs The calibrator is supplied with one aluminum bronze probe sleeve for in sertion into the calibrator well and tongs for removing sleeves Probe sleeves of various internal hole sizes are available see Table 3 to allow the user s probe to fit snugly into the well whatever the diameter of the probe 18 Manual Rev 050801 9127 6 Parts and Controls Standard and Custom Insert Sizes Model Number Size Insert 3109 0 Blank 3109 1 6 holes 2 at 3 16 2 at 1 4 and 2 at 3 8 inch B 3109 2 6 holes 1 16 1 8 3 16 1 4 3 8 and 1 2 inch A 3109 3 8 holes each at 1 4 inch C Table 3 Available Inserts 1 4 1 4 3 16 1 8 1 2 1 16 3 8 Insert A Insert B Insert C 3 8 3 8 1 4 1 4 3 16 3 16 Figure 4 Inserts available for the 9127 block assembly 7 General Operation 7 1 Calibrator Set Up Place the calibrator on a flat surface with at least 6 inches of free space around the instrument Plug the power cord into a grounded mains outlet Observe that the nominal voltage corresponds to that indicated on the back of the calibrator Gently insert the probe sleeve into the well The well must be clear of any foreign objects dirt and grit before the sleeve is inserted The sleeve is inserted with the two small tong holes positione
30. Power bumps from brown outs and black outs could dam Hart Scientific Manual Rev 050801 11 4 Safety Guidelines age the instrument Wait until the power has stabilized before re energizing the instrument Never introduce any foreign material into the probe hole of the insert Fluids etc can leak into the calibrator causing damage 12 Manual Rev 050801 9127 4 Safety Guidelines 5 Quick Start 5 1 Unpacking Unpack the dry well carefully and inspect it for any damage that may have occurred during shipment If there is shipping damage notify the carrier immediately Verify that the following components are present 9127 Dry well Insert Power Cord Manual Tongs insert removal tool 5 2 Set up Place the calibrator on a flat surface with at least 6 inches of free space around the instrument Overhead clearance is required DO NOT place under a cabinet or other structure Plug the power cord into a grounded mains outlet Observe that the nominal voltage corresponds to that indi cated on the back of the calibrator Carefully insert the probe sleeve into the well The well must be clear of any foreign objects dirt and grit before the sleeve is inserted The sleeve is inserted with the two small tong holes positioned upward Probe sleeves should be of the smallest hole diameter possible still al lowing the probe to slide in and out easily Sleeves of various sizes are available from
31. Sequence If the unit repeats the error code contact Hart Scientific Customer Support for a return authoriza tion and for instructions on returning the unit Master Reset Sequence Hold the SET and EXIT keys down at the same time while powering up the unit The screen will display init the instrument model number and the version of the software The unit will need to be reprogrammed for R0 ALPHA and DELTA in the calibration menu These numbers can be found on the Report of Calibration that was shipped with the unit If the display flashes 273 C or 459 F The sensor is disconnected or shorted Please contact Hart Scientific Customer Support for further instructions Hart Scientific Manual Rev 050801 61 13 Troubleshooting Problem Causes and Solutions If the display flashes cut out The software cut out is set to low Check the cut out set ting in the Set point menu Temperature readout is not the actual tem perature of the well With the unit stable slowly rotate the unit If no change occurs the unit may need to be calibrated Contact Hart Scientific Customer Service If the display changes more than twice the normal display deviation another unit in the area could be emitting RF energy Move the unit to a different location and rotate the unit again If the temper ature is correct in this new area or deviates differently than the first area RF energy is present in the room I
32. action can cause a shock to the sensor If a hazardous material is spilt on or inside the equipment the user is responsible for taking the appropriate decontamination steps as out lined by the national safety council with respect to the material If the mains supply cord becomes damaged replace it with a cord with the appropriate gauge wire for the current of the instrument If there are any questions call Hart Scientific Customer Service for more in formation Before using any cleaning or decontamination method except those recommended by Hart users should check with Hart Scientific Cus tomer Service to be sure that the proposed method will not damage the equipment If the instrument is used in a manner not in accordance with the equip ment design the operation of the dry well may be impaired or safety hazards may arise The over temperature cut out should be checked every 6 months to see that it is working properly In order to check the user selected Hart Scientific Manual Rev 050801 59 12 Maintenance cut out follow the controller directions Section 8 10 for setting the cut out Both the manual and the auto reset option of the cut out should be checked Set the instrument temperature higher than the cut out Check to see if the display flashes cut out and the tempera ture is decreasing 60 Manual Rev 050801 9127 12 Maintenance 13 Troubleshooting 13 1 Troubleshooting In the event
33. al LED display on the front panel allows direct viewing of the ac tual well temperature This temperature value is what is normally shown on the display The units C or F of the temperature value are displayed at the right For example 100 00 C Well temperature in degrees Celsius The temperature display function may be accessed from any other func tion by pressing the EXIT button 8 2 Reset Cut out If the over temperature cut out has been triggered then the temperature display will alternately flash Cut out Indicates cut out condition The message will continue to flash until the temperature is reduced and the cut out is reset The cut out has two modes automatic reset and manual reset The mode determines how the cut out is reset which allows the instrument to heat up again When in automatic mode the cut out will reset itself as soon as the temperature is lowered below the cut out set point With manual reset mode the cut out must be reset by the operator after the temperature falls below the set point Hart Scientific Manual Rev 050801 21 8 Controller Operation 22 Manual Rev 050801 9127 8 Controller Operation Calibration Menu CTO Adjust CTO C0 Adjust C0 CG SCO Adjust CG Adjust SCO SET EXIT IEEE 488 Interface Menu Device Address Adj Device Address UP UP UP UP DOWN DOWN DOWN DOWN SET SET SET SET SET EXIT Operating Parameters Menu SET
34. ation and skip to the next parameter in the menu 8 14 2 Sample Period The sample period is the next parameter in the serial interface parameter menu The sample period is the time period in seconds between temper ature measurements transmitted from the serial interface If the sample rate is set to 5 for instance the instrument transmits the current mea surement over the serial interface approximately every five seconds The automatic sampling is disabled with a sample period of 0 The sample period is indicated by SAmPLE Serial sample period parameter Press SET to choose to set the sample period The current sample pe riod value will be displayed SA 1 Current sample period seconds Adjust the value with UP or DOWN and then use SET to set the sample rate to the displayed value SA 60 New sample period 8 14 3 Duplex Mode The next parameter is the duplex mode The duplex mode may be set to full duplex or half duplex With full duplex any commands received by the calibrator via the serial interface are immediately echoed or transmitted back to the device of origin With half duplex the commands are executed but not echoed The duplex mode parameter is indicated by dUPL Serial duplex mode parameter Press SET to access the mode setting dUP FULL Current duplex mode setting The mode may be changed using UP or DOWN and pressing SET Hart Scientific Manual Rev 05
35. ax 801 763 1010 E mail support hartscientific com THE FOREGOING WARRANTY IS PURCHASER S SOLE AND EXCLU SIVE REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES EX PRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OR MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE OR USE HART SHALL NOT BE LIABLE FOR ANY SPECIAL INDIRECT INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSS WHETHER IN CONTRACT TORT OR OTHER WISE Hart Scientific Manual Rev 050801 9 3 Specifications and Environmental Conditions 4 Safety Guidelines Operate the instrument in room temperatures between 5 50 C 41 122 F Allow sufficient air circulation by leaving at least 6 inches of space between the instrument and nearby objects DO NOT place under a cabinet or other structure Allow for overhead clearance The dry well is a precision instrument Although it has been designed for optimum durability and trouble free operation it must be handled with care Always carry the unit in an upright position to prevent the probe sleeves from dropping out The convenient fold up handle al lows one hand carrying The instrument should not be operated in ex cessively wet oily dusty or dirty environments It is important to keep the well of the instrument clean and clear of any foreign matter Do not operate near flammable materials DO NOT use fluids to clean out the well The instrument can generate extreme temperatures Precautio
36. best results insert probes the full depth of well 52 Manual Rev 050801 9127 10 Test Probe Calibration 10 2 2 Fully Loading the Calibrator The 9127 temperature calibrator features multiple thermometer test sen sor holes allowing increased throughput Calibrating multiple probes is similar to singles Comparison to an external reference can improve the results since the additional heat loss created by the stems of the probes can reduce the temperature at the test sensor locations to a temperature below that indicated on the calibrator display The amount of the discrep ancy will depend on the size and number of probes to be tested as well as the magnitude of the temperature difference to ambient Recovery time due to insertion of several probes into the calibrator will also in crease If a series of temperature points are to be measured with the same test probes it will be faster to leave them in the calibrator as the temperature changes are made Warning Never introduce any foreign material into the probe hole of the insert Fluids etc can leak into the calibrator causing damage to the calibrator or binding and damage to your probe 10 2 3 Stabilization and Accuracy The stabilization time of the dry well calibrator will depend on the condi tions and temperatures involved Typically the test well will be stable to 0 1 C within 15 minutes of reaching the set point temperature as indi cated by the display Ultimate stability wi
37. between one hole and an other which can cause errors Using the same hole for the reference thermometer and the test probe may have better results This however requires switching the probes which takes more time One must allow a few minutes after inserting the probes for the temperature to stabilize before making measurements Be cause of temperature variations along the length of the well best results are obtained when comparing probes of similar construction and insert ing them the same depth into the well 20 Manual Rev 050801 9127 7 General Operation 8 Controller Operation This Section discusses in detail how to operate the dry well temperature controller using the front control panel Using the front panel key switches and LED display the user may monitor the well temperature set the tem perature set point in degrees C or F monitor the heater output power ad just the controller proportional band set the cut out set point and program the probe calibration parameters operating parameters serial and IEEE 488 interface configuration and controller calibration parame ters Operation of the controller functions is summarized in Figure 5 In the following discussion a solid box around the word SET UP EXIT or DOWN indicates the panel button while the dotted box indicates the dis play reading Explanation of the button or display reading are to the right of each button or display value 8 1 Well Temperature The digit
38. commands are ASCII character strings terminated with a car riage return character CR ASCII 13 9 2 IEEE 488 Communication The IEEE 488 interface is available as an option Instruments supplied with this option may be connected to a GPIB type communication bus which allows many instruments to be connected and controlled simulta neously To eliminate noise the GPIB cable should be shielded 9 2 1 Setup To use the IEEE 488 interface first connect an IEEE 488 standard cable to the back of the calibrator Next set the device address This parameter is programmed within the IEEE 488 interface menu To enter the IEEE 488 parameter programming menu first press EXIT while pressing SET and release to enter the secondary menu Press SET repeatedly until the display reaches PrObE This is the menu se lection Press UP repeatedly until the IEEE 488 interface menu is indi Hart Scientific Manual Rev 050801 45 9 Digital Communication Interface cated with IEEE Press SET to enter the IEEE 488 parameter menu The IEEE 488 menu contains the IEEE 488 address parameter 9 2 1 1 IEEE 488 Interface Address The IEEE 488 address is prompted with AddrESS Press SET to pro gram the address The default address is 22 Change the device address of the calibrator if necessary to match the address used by the communi cation equipment by pressing UP or DOWN and then SET 9 2
39. d to help prevent this occur rence Setting the temperature involves two steps 1 select the set point mem ory and 2 adjust the set point value 8 3 1 Programmable Set points The controller stores 8 set point temperatures in memory The set points can be quickly recalled to conveniently set the calibrator to a previously programmed temperature set point To set the temperature one must first select the set point memory This function is accessed from the temperature display function by pressing SET The number of the set point memory currently being used is shown at the left on the display followed by the current set point value 100 00 C Well temperature in degrees Celsius S Access set point memory Hart Scientific Manual Rev 050801 23 8 Controller Operation 1 100 0 Set point memory 1 100 0 C currently used To change the set point memory press UP or DOWN 4 400 0 New set point memory 4 400 0 C Press SET to accept the new selection and access the set point value S Accept selected set point memory 8 3 2 Set point Value The set point value may be adjusted after selecting the set point mem ory and pressing SET The set point value is displayed with the units C or F at the left C 400 00 Set point 4 value in C If the set point value need not be changed then press EXIT to resume displaying the well temperature Press UP or DOWN to adjust the set
40. d upward The probe sleeve should be of the smallest hole size possible while allowing the probe to slide in and out easily Sleeves of various sizes are available from the manufacturer Turn on the power to the calibrator by toggling the switch at the rear of the instrument to the l on position The fan will begin circulating air through the instrument After a brief self test the controller should begin normal operation showing the well temperature The block will heat or cool until it reaches the programmed set point 7 2 Switch to 230 V Operation To change the mains voltage perform the following steps 1 Unplug the unit from the power source 2 Insert a flat headed screwdriver into the slot on the PEM 3 Remove the fuse holder from the PEM 4 Change the fuses to the appropriate current rating for the voltage see Section 4 Safety Guidelines 5 The power cord may need to be changed to mate with the appro priate 230 VAC or 115 VAC socket Some options are listed 230 VAC Europe 10A approved cord with CEE 717 plug US 15A approved cord with a NEMA 6 15 straight blade plug 115 VAC US 15A approved cord with a NEMA 5 15 plug 7 3 Setting the Temperature Section 8 3 explains in detail how to set the temperature set point on the calibrator using the front panel keys The procedure is summarized here Hart Scientific Manual Rev 050801 19 7 General Operation 1 Press SET twic
41. de less than 2000 meters 3 3 Warranty Hart Scientific Inc Hart warrants this product to be free from defects in material and workmanship under normal use and service for a period as stated in our current product catalog from the date of shipment This war ranty extends only to the original purchaser and shall not apply to any product which in Hart s sole opinion has been subject to misuse alter ation abuse or abnormal conditions of operation or handling Software is warranted to operate in accordance with its programmed in structions on appropriate Hart products It is not warranted to be error free Hart s obligation under this warranty is limited to repair or replacement of a product which is returned to Hart within the warranty period and is de termined upon examination by Hart to be defective If Hart determines that the defect or malfunction has been caused by misuse alteration abuse or abnormal conditions or operation or handling Hart will repair the product and bill the purchaser for the reasonable cost of repair To exercise this warranty the purchaser must forward the product after calling or writing Hart for authorization Hart assumes NO risk for in transit damage For service or assistance please contact the manufacturer Hart Scientific Inc 799 East Utah Valley Drive American Fork UT 84003 9775 8 Manual Rev 050801 9127 3 Specifications and Environmental Conditions Phone 801 763 1600F
42. e to access the set point value 2 Press UP or DOWN to change the set point value 3 Press SET to program in the new set point 4 Press EXIT to return to the temperature display When the set point temperature is changed the controller will switch the well heater on or off to raise or lower the temperature The cycle indica tor a two color LED will also indicate on red and heating or off green and cooling The displayed well temperature will gradually change until it reaches the set point temperature The well may require 5 to 20 minutes to reach the set point depending on the span Another 5 to 10 minutes is required for the temperature to stabilize 7 4 Calibrating Probes The dry well block provides a constant temperature environment in which probes may be compared The probes inserted into the block may be compared to the well temperature displayed on the front panel of the cali brator The probes should be inserted the full depth of the well since the temperature at the bottom of the well will most closely agree with the dis played temperature For greater accuracy the probes may be compared to a reference ther mometer inserted into the block The reference thermometer may be in serted into one hole while the probes to be calibrated are inserted into another The drawback to this method is that because of temperature variations throughout the block there may be a small temperature differ ence
43. e very hot due to the fan blowing upward Follow all safety guidelines listed in the user s manual CALIBRATION EQUIPMENT should only be used by TRAINED PERSONNEL CAUTIONS To avoid possible damage to the instrument follow these guide lines Components and heater lifetime can be shortened by continu ous high temperature operation Most probes have handle temperature limits Be sure that the probe handle temperature limit is not exceeded in the air above the unit DO NOT use fluids to clean out the well Never introduce any foreign material into the probe hole of the insert Fluids etc can leak into the calibrator causing dam age DO NOT change the values of the calibration constants from the factory set values The correct setting of these parameters is important to the safety and proper operation of the calibrator DO NOT slam the probe stems in to the well This type of action can cause a shock to the sensor and affect the calibration Hart Scientific Manual Rev 050801 3 1 Before You Start 1 3 Customer Service Information Hart Scientific can be contacted by writing to Hart Scientific Inc 799 E Utah Valley Drive American Fork UT 84003 9775 Or by calling or faxing Telephone 801 763 1700 Fax 801 763 1010 Our World Wide Web site is www hartscientifc com E mail support hartscientific com When calling Hart Scientific Customer Service please have the following information available
44. er Operation Function Action 1 up stop 2 up down stop 3 up repeat 4 up down repeat Table 4 Program mode setting actions S Save new setting 8 6 5 Program Control The final parameter in the program menu is the control parameter You may choose between three options to either start the program from the beginning continue the program from where it was when it was stopped or stop the program Pr OFF Program presently off Use the UP or DOWN buttons to change the status Pr StArt Start cycle from beginning Press SET to activate the new program control command and return to the temperature display S Activate new command 8 7 Secondary Menu Functions which are used less often are accessed within the secondary menu The secondary menu is accessed by pressing SET and EXIT simultaneously and then releasing The first function in the secondary menu is the heater power display See Figure 5 on page 22 8 8 Heater Power The temperature controller controls the temperature of the well by puls ing the heater on and off The total power being applied to the heater is determined by the duty cycle or the ratio of heater on time to the pulse cycle time This value may be estimated by watching the red green con trol indicator light or read directly from the digital display By knowing the amount of heating the user can tell if the calibrator is heating up to the set point cooling dow
45. erence inserted into one well and the probe under test in serted into a second well make measurements of each Swap the locations of the reference probe and probe under test Allow plenty of time for thermal settling Make another set of measurements of the reference probe and the probe under test Average the two measurements of the reference probe Average the two measurements of the probe under test Averaging the two mea surements in this way eliminates error due to temperature gradients between the two wells You may now compare the averaged measurement of the probe un der test with the averaged measurement of the reference probe For best results repeat the test several times at the same temperature and at different temperatures This method can be used with different types of probes but the user must determine the uncertainty of the measurement 10 2 Dry Well Characteristics Understanding the thermal characteristics of the dry well calibrator can help you achieve the best accuracy and efficiency possible 10 2 1 Vertical Gradient There is a temperature gradient vertically in the test well The heater has been applied to the block in such a way as to compensate for nominal heat losses out of the top of the dry well and minimize vertical tempera ture gradients However actual heat losses will vary depending on the number and types of probes inserted into the calibrator and the block temperature For
46. erface that al lows serial digital communications over fairly long distances With the se rial interface the user may access any of the functions parameters and settings discussed in Section 8 with the exception of the BAUD rate set ting 9 1 1 Wiring The serial communications cable attaches to the calibrator through the DB 9 connector at the back of the instrument Figure 8 shows the pin out of this connector and suggested cable wiring To eliminate noise the se rial cable should be shielded with low resistance between the connector DB 9 and the shield 9 1 2 Setup Before operation the serial interface must first be set up by programming the BAUD rate and other configuration parameters These parameters are programmed within the serial interface menu To enter the serial parameter programming mode first press EXIT while pressing SET and release to enter the secondary menu Press SET repeatedly until the display reads ProbE This is the menu selection Press UP repeatedly until the serial interface menu is indicated with SErIAL Finally press SET to enter the serial parameter menu In the serial interface parameters menu are the BAUD rate the sample rate the duplex mode and the linefeed parameter 9 1 2 1 BAUD Rate The BAUD rate is the first parameter in the menu The display will prompt with the BAUD rate parameter by showing BAUd Press SET to Hart Scientific Manual
47. ermination The transmission termination character can be set to carriage return only linefeed only or carriage return and linefeed Regardless of the option selected the instrument will interpret either a carriage return or linefeed as a command termination during reception The termination parameter is indicated with EOS IEEE 488 termination Press SET to access the termination setting EOS Cr Present IEEE 488 termination Use UP or DOWN to change the selection EOS LF New termination selection Use SET to save the new selection 8 16 Calibration Parameters The user has access to a number of the instrument calibration constants namely CTO C0 and CG These values are set at the factory and must not be altered The correct values are important to the accuracy and proper and safe operation of the calibrator Access to these parameters is available to the user only so that in the event that the controller s memory fails the user may restore these values to the factory settings The user should have a list of these constants and their settings with the manual Caution DO NOT change the values of the calibration constants from the factory set values The correct setting of these parameters is im portant to the safety and proper operation of the calibrator The calibration parameters menu is indicated by CAL Calibration parameters menu Press SET five times to enter the menu Hart Scienti
48. ers menu contains the units scale setting cut out reset mode setting approach setting and soak stability setting 8 13 1 Temperature Scale Units The temperature scale units of the controller may be set by the user to degrees Celsius C or Fahrenheit F The units will be used in display ing the well temperature set point proportional band and cut out set point The temperature scale units selection is the first function in the operating parameters menu Un C Scale units currently selected Press UP or DOWN to change the units Un F New units selected Press SET to accept the new selection and resume displaying the well temperature 8 13 2 Cut out Reset Mode The cut out reset mode determines whether the cut out resets automati cally when the well temperature drops to a safe value or must be manu ally reset by the operator The parameter is indicated by CtorSt Cut out reset mode parameter Press SET to access the parameter setting Normally the cut out is set for automatic mode Hart Scientific Manual Rev 050801 37 8 Controller Operation Cto Auto Cut out set for automatic reset To change to manual reset mode press UP and then SET Cto rSt Cut out set for manual reset 8 13 3 Approach The approach parameter can be used to reduce overshoot The larger the value the less overshoot there will be However if the value is too large it may take too long fo
49. f you have to perform the test in the effected area use the comparison test to eliminate any possible errors 13 2 Comments 13 2 1 EMC Directive Hart Scientific s equipment has been tested to meet the European Elec tromagnetic Compatibility Directive EMC Directive 89 336 EEC Selec tion of Light Industrial or Heavy Industrial compliance has been based on the intended use of the instrument Units designed for use in a calibration laboratory have been tested to Light Industrial Standards Units designed to be used in the field have been tested to both Light Industrial and Heavy Industrial Standards The Declaration of Conformity for your in strument lists the specific standards to which the unit was tested 13 2 2 Low Voltage Directive Safety In order to comply with the European Low Voltage Directive 73 23 EEC Hart Scientific equipment has been designed to meet the IEC 1010 1 EN 61010 1 and IEC 1010 2 010 EN 61010 2 010 standards 62 Manual Rev 050801 9127 13 Troubleshooting 13 3 Wiring Diagram Hart Scientific Manual Rev 050801 63 13 Troubleshooting 9122 23 24 26 27 WRG 9122 9124 AND 9126 2 SYSTEM FUSE C WHT BLK ORG 9123 YEL 10 22 96 BLK RED WHT BLK RED WHT RED WHT RED WHT GRY WHT BLK YEL WHT YEL WHT YEL WHT BLK YEL WHT YEL WHT ORG WHT ORG WHT GRY WHT BLK GRY WHT GRN BLU BRN BLU WHT BLK GRY WHT BLK YEL WHT GRY WHT FUSES
50. fic Manual Rev 050801 41 8 Controller Operation 8 16 1 CTO Parameter CTO sets the calibration of the over temperature cut out This is not adjustable by software but is adjusted with an internal potentiome ter For the 9127 dry well calibrator this parameter should read between 610 and 630 8 16 2 CO and CG These parameters calibrate the accuracy of the temperature set point These are programmed at the factory when the instrument is calibrated Do not alter the value of these parameters If the user desires to calibrate the instrument for improved accuracy then calibrate R0 and ALPHA ac cording to the procedure given in Section 11 8 16 3 SCO This parameter is used at the factory for testing purposes and SHOULD NOT be altered by the user 42 Manual Rev 050801 9127 8 Controller Operation 9 Digital Communication Interface The dry well calibrator is capable of communicating with and being con trolled by other equipment through the digital interface Two types of digi tal interface are available the RS 232 serial interface and the optional IEEE 488 GPIB interface With a digital interface the instrument may be connected to a computer or other equipment This allows the user to set the set point temperature monitor the temperature and access any of the other controller functions all using remote communications equipment 9 1 Serial Communications The calibrator may be installed with an RS 232 serial int
51. he cut out set point may be accessed within the secondary menu Press SET and EXIT to enter the secondary menu and show the heater power Then press SET twice to access the cut out set point S E Access heater power in secondary menu 12 Pct Heater power in percent S Access proportional band Pb 4 01C Proportional band setting S Access cut out set point CO 610C Cut out set point To change the cut out set point press UP or DOWN CO 400C New cut out set point To accept the new cut out set point press SET S Accept cut out set point The next function is the configuration menu Press EXIT to resume dis playing the well temperature Hart Scientific Manual Rev 050801 35 8 Controller Operation 8 11 Controller Configuration The controller has a number of configuration and operating options and calibration parameters which are programmable via the front panel These are accessed from the secondary menu after the cut out set point function by pressing SET There are 5 sets of configuration parameters probe parameters operating parameters serial interface parameters IEEE 488 interface parameters and controller calibration parameters The menus are selected using the UP and DOWN keys and then pressing SET 8 12 Probe Parameters The probe parameter menu is indicated by PrObE Probe parameters menu Press SET to enter the menu T
52. he probe parameters menu contains the parameters R0 ALPHA and DELTA which characterize the resis tance temperature relationship of the platinum control sensor These pa rameters may be adjusted to improve the accuracy of the calibrator This procedure is explained in detail in Section 11 The probe parameters are accessed by pressing SET after the name of the parameter is displayed The value of the parameter may be changed using the UP and DOWN buttons After the desired value is reached press SET to set the parameter to the new value Pressing EXIT will cause the parameter to be skipped ignoring any changes that may have been made 8 12 1 R0 This probe parameter refers to the resistance of the control probe at 0 C The value of this parameter is set at the factory for best instrument accu racy 8 12 2 ALPHA This probe parameter refers to the average sensitivity of the probe be tween 0 and 100 C The value of this parameter is set at the factory for best instrument accuracy 36 Manual Rev 050801 9127 8 Controller Operation 8 12 3 DELTA This probe parameter characterizes the curvature of the resis tance temperature relationship of the sensor The value of this parameter is set at the factory for best instrument accuracy 8 13 Operating Parameters The operating parameters menu is indicated by PAr Operating parameters menu Press UP to enter the menu The operating paramet
53. ill exit the secondary menu ignoring any changes just made to the proportional band value S Accept the new proportional band setting 8 10 Cut out As a protection against software or hardware fault shorted heater triac or user error the calibrator is equipped with an adjustable heater cut out device that will shut off power to the heater if the well temperature ex 34 Manual Rev 050801 9127 8 Controller Operation Proportional Band too Narrow Proportional Band too Wide Optimum Proportional Band Figure 7 Well temperature fluctuation at various proportional band settings ceeds a set value This protects the instrument and probes from exces sive temperatures The cut out temperature is programmable by the operator from the front panel of the controller If the cut out is activated because of excessive well temperature then power to the heater will be shut off and the instrument will cool The well will cool until it reaches a few degrees below the cut out set point tem perature At this point the action of the cut out is determined by the set ting of the cut out mode parameter The cut out has two modes automatic reset or manual reset If the mode is set to automatic then the cut out will automatically reset itself when the temperature falls below the reset temperature allowing the well to heat up again If the mode is set to manual then the heater will remain disabled until the user manually re sets the cut out T
54. in let that plugs into an IEC grounded socket Fuses The unit is equipped woth the appropriate fuse for the voltage 10A 250V for 115 VAC and 5A 250V for 230 VAC The fuses should never be replaced with one of a different type current or voltage rating Power Switch The power switch is located on the power entry model PEM The PEM also houses the fuses and the dual voltage selector The PEM and heater voltage witch al low the unit to be field switched for 115 VAC 10 or 230 VAC 10 operation See Section 7 2 for instruc tions on changing the input voltage Heater Voltage Switch The heater voltage switch can be switched be tween 115 VAC and 230 VAC This switch setting mucst match the PEM setting See Section 7 2 for instruc tions on changing the input voltage Serial Port A DB 9 connector is present on all units for interfacing the calibrator to a computer or terminal with serial RS 232 communications IEEE 488 Port optional This con nector is for interfacing the calibrator Hart Scientific Manual Rev 050801 15 6 Parts and Controls 115V 115V DISPLAY HOLD RS 232 POWER 115V 230V 50 60 Hz 1000W IEEE 488 option 115V 10A F 250V 230V 5A F 250V CAT 300V HEATER VOLTAGE SELECTOR Figure 2 Back Panel to an IEEE 488 GPIB bus for control and communications Display Hold The two terminals may be used to wire a switch or cut out to the calibrator to trigger the inst
55. justed to minimize the set point error at each of two different dry well temperatures Any two reasonably separated temperatures may be used for the calibration Im proved results can be obtained for shorter ranges when using tempera tures that are just within the most useful operating range of the dry well The farther apart the calibration temperatures the larger will be the cali brated temperature range but the calibration error will also be greater over the range If for instance 150 C and 500 C are chosen as the cali bration temperatures then the calibrator may achieve an accuracy of say 0 2 C over the range 100 to 550 C Choosing 200 C and 300 C may al low the calibrator to have a better accuracy of maybe 0 05 C over the range 175 to 325 C but outside that range the accuracy may be only 0 4 C 11 2 Measuring the Set point Error The first step in the calibration procedure is to measure the temperature errors including sign at the two calibration temperatures First set the calibrator to the lower set point that we will call tL Wait for the well to reach the set point and allow 30 to 60 minutes to stabilize at that temper ature Check the stability with the thermometer When both the well and the thermometer have stabilized measure the temperature with the ther mometer and compute the temperature error errL which is the actual well temperature minus the set point temperature If for example the calibra tor is set fo
56. ll be achieved 10 to 20 minutes after reaching the set temperature Inserting a cold probe into a well will require another period of stabilizing depending on the magnitude of the disturbance and the required accu racy For example inserting a 25 inch diameter room temperature probe into a sleeve at 300 C will take 5 minutes to be within 0 1 C of its settled point and will take 30 minutes to achieve maximum stability Decreasing the time required for the calibration process can be accom plished by knowing how soon to make the measurement It is recom mended that typical measurements be made at the desired temperatures with the desired test probes to establish these times Hart Scientific Manual Rev 050801 53 10 Test Probe Calibration 11 Calibration Procedure Sometimes the user may want to calibrate the dry well to improve the temperature set point accuracy Calibration is done by adjusting the con troller probe calibration constants R0 and ALPHA so that the temperature of the dry well as measured with a standard thermometer agrees more closely with the set point The thermometer used must be able to mea sure the well temperature with higher accuracy than the desired accuracy of the dry well By using a good thermometer and carefully following pro cedure the calibrator can be calibrated to an accuracy of better than 0 5 C over a range of 600 degrees 11 1 Calibration Points In calibrating the dry well R0 and ALPHA are ad
57. menu and to set param eters to the displayed value DOWN Used to decrement the displayed value of parameters UP Used to increment the displayed value EXIT Used to exit from a menu When EXIT is pressed any changes made to the displayed value will be ignored Control Indicator The Control Indicator is a two color light emitting di ode This indicator lets the user visually see the ratio of heating to cool 16 Manual Rev 050801 9127 6 Parts and Controls ing When the indicator is red the heater is on and when it is green the heater is off and the dry well is cooling 6 3 Constant Temperature Block Assembly Shown in Figure 4 on page 18 is the constant temperature block assem bly 6 3 1 Constant Temperature Block The Block is made of aluminum bronze and provides a relatively con stant and accurate temperature environment for the sensor that is to be calibrated A 1 45 inch 36 83 mm diameter well is provided that may be used for sensors of that size or may be sleeved down with various sized multi hole probe sleeves Heatesr surround the block assembly and pro vide even heat to the sensor A high temperature platinum RTD is imbed ded at the base of the block assembly to sense and control the temperature of the block The entire assembly is suspended in an air cooled chamber thermally isolated from the chassis and electronics Hart Scientific Manual Rev 050801 17 6 Parts and Controls SET
58. n or controlling at a constant temperature Moni toring the percent heater power will let the user know how stable the well temperature is With good control stability the percent heating power should not fluctuate more than 1 within one minute The heater power display is accessed in the secondary menu Press SET and EXIT simultaneously and release The heater power will be displayed as a percentage of full power 32 Manual Rev 050801 9127 8 Controller Operation 100 00 C Well temperature S E Access heater power in secondary menu 12 Pct Heater power in percent To exit out of the secondary menu press EXIT To continue on to the proportional band setting function press SET 8 9 Proportional Band In a proportional controller such as this the heater output power is pro portional to the well temperature over a limited range of temperatures around the set point This range of temperature is called the proportional band At the bottom of the proportional band the heater output is 100 At the top of the proportional band the heater output is 0 Thus as the temperature rises the heater power is reduced which consequently tends to lower the temperature back down In this way the temperature is maintained at a fairly constant temperature The temperature stability of the well and response time depend on the width of the proportional band See Figure 7 If the band is too wide the well temperature will de
59. ns must be taken to prevent personal injury or damage to objects Probes may be extremely hot or cold when removed from the instrument Cautiously handle probes to prevent personal injury Always use the special sleeve tongs that are supplied with the calibrator to remove the sleeve Carefully place probes on a heat cold resistant surface or rack until they are at room temperature Never place any objects other than the special probe sleeves supplied with the calibrator into the well Use only a grounded AC mains supply of the appropriate voltage to power the instrument The dry well requires 10 amps at 115 VAC 10 50 60 Hz 5 amps at 230 VAC 10 Before initial use after transport and anytime the dry well has not been energized for more than 10 days the instrument needs to be en ergized for a dry out period of 1 2 hours before it can be assumed to meet all of the safety requirements of the IEC 1010 1 The instrument is equipped with operator accessible fuses If a fuse blows it may be due to a power surge or failure of a component Re place the fuse once If the fuse blows a second time it is likely caused by failure of a component part If this occurs contact Hart Scientific Customer Service Always replace the fuse with one of the same rat ing voltage and type Never replace the fuse with one of a higher cur rent rating If a mains supply power fluctuation occurs immediately turn off the in strument
60. on parameter r 0 r r0 999 999 r0 100 578 Set R0 calibration parameter to n r 0 n r 100 324 98 0 to 104 9 Read ALPHA calibration parameter al pha al al 9 9999999 al 0 0038573 Set ALPHA calibration parameter to n al pha n al 0 0038433 00370 to 00399 Read DELTA calibration parameter de lta de de 9 99999 de 1 46126 Set DELTA calibration parameter to n de lta n de 1 45 0 0 to 2 9 Operating Parameters Menu Set temperature units u nits c f C or F Set temperature units to Celsius u nits c u c Set temperature units to Fahrenheit u nits f u f Read cutout mode cm ode cm cm xxxx cm AUTO Set cutout mode cm ode r eset a uto RESET or AUTO Set cutout to be reset manually cm ode r eset cm r Set cutout to be reset automatically cm ode a uto cm a Read approach setting ap proach ap ap 9 ap 5 Set approach setting to n degrees ap proach n ap 15 0 to 20 C Read stability ts ts ts 9 9 ts 0 5 Set soak stability to n degrees ts n ts 1 01 to 4 99 C Serial Interface Menu Read serial sample setting sa mple sa sa 9 sa 1 Set serial sampling setting to n seconds sa mple n sa 0 0 to 4000 Set serial duplex mode du plex f ull h alf FULL or HALF Set serial duplex mode to full du plex f ull du f Set serial duplex mode to half du plex h alf du h Set serial linefeed mode lf eed on of f ON or OFF Set serial linefeed mode to
61. owed by a carriage return and linefeed Then the value is returned as indicated in the RETURNED column Interface Commands continued 10 Test Probe Calibration For optimum accuracy and stability allow the calibrator to warm up for 30 minutes after power up and then allow adequate stabilization time after reaching the set point temperature After completing calibration allow the block to cool by setting the temperature to 100 C or less before switching the power off 10 1 Calibration Methods 10 1 1 Direct Calibration Direct calibration involves testing a probe directly against the dry well s temperature display The advantage of this method is that it is quick and easy Insert the probe to be calibrated into the well of the dry well calibrator The probe should fit snugly into the calibrator probe sleeve yet should not be so tight that it cannot be easily removed Avoid any dirt or grit that may cause the probe to jam into the sleeve Best results are obtained with the probe inserted to the full depth of the well Once the probe is in serted into the well allow adequate stabilization time to allow the test probe temperature to settle as described Once the probe has settled to the temperature of the well it may be compared to the calibrator display temperature The display temperature should be stable to within 0 1 C for best results Caution Never introduce any foreign material into the probe hole of the insert Fluids etc
62. puted as 100 193 and 0 0038272 respectively Program the new values R0 and AL PHA into the controller Check the calibration by setting the temperature to tL and tH and measuring the errors again If desired the calibration pro cedure may be repeated to further improve the accuracy 11 4 Calibration Example The calibrator is to be used between 125 and 325 C and it is desired to calibrate the calibrator as accurately as possible for operation within this range The current values for R0 and ALPHA are 100 000 and 0 0038500 respectively The calibration points are chosen to be 150 00 and 300 00 C The measured well temperatures are 149 943 and 299 814 C respectively Refer to Figure 9 for applying equations to the example data and computing the new probe constants 56 Manual Rev 050801 9127 11 Calibration Procedure Hart Scientific Manual Rev 050801 57 11 Calibration Procedure R0 100 000 ALPHA 0 0038500 tL 150 00 C measured t 149 943 C tH 300 00 C measured t 299 814 C Compute errors errL 149 943 150 00 C 0 057 C errH 299 814 300 00 C 0 186 C Compute R0 R0 0 186 1500 0 0 057 300 0 300 0 150 0 0 003 85 1 100 000 99 9723 Compute ALPHA ALPHA 1 0 00385 300 0 0 057 1 0 00385 150 0
63. r a lower set point of tL 200 C and it reaches a measured temperature of 199 7 C then the error is 0 3 C Next set the calibrator for the upper set point tH and after stabilizing mea sure the well temperature and compute the error errH For this example suppose the calibrator was set for 400 C and the thermometer measured 400 1 C giving an error of 0 1 C Hart Scientific Manual Rev 050801 55 11 Calibration Procedure 11 3 Computing R0 and ALPHA Before computing the new values for R0 and ALPHA the current values must be known The values may be found by either accessing the probe calibration menu from the controller panel or by inquiring through the se rial interface The user should keep a record of these values in case they may need to be restored in the future The new values R0 and ALPHA are computed by entering the old values for R0 and ALPHA the calibra tion temperature set points tL and tH and the temperature errors errL and errH into the following equations R err t err t t t ALPHA R H L L H H L 0 0 1 ALPHA ALPHA t err ALPHA t err t t H L L H H L 1 1 1 ALPHA If for example R0 and ALPHA were previously set for 100 2695 and 0 0038319 respectively and the data for tL tH errL and errH were as given above then the new values R0 and ALPHA would be com
64. r the temperature to settle to a new set point The default value is 5 It can be changed in the parameter menu 8 13 4 Soak Stability The soak stability controls the required stability of the well temperature for the soak time see section 8 6 3 The stability is in degrees Celsius The default is 0 1 C This value can be changed in the parameter menu 8 14 Serial Interface Parameters The serial RS 232 interface parameters menu is indicated by SErIAL Serial RS 232 interface parameters menu The serial interface parameters menu contains parameters which deter mine the operation of the serial interface These controls only apply to in struments fitted with the serial interface The parameters in the menu are BAUD rate sample period duplex mode and linefeed 8 14 1 BAUD Rate The BAUD rate is the first parameter in the menu The BAUD rate setting determines the serial communications transmission rate The BAUD rate parameter is indicated by BAUd Serial BAUD rate parameter Press SET to choose to set the BAUD rate The current BAUD rate value will then be displayed 1200 b Current BAUD rate 38 Manual Rev 050801 9127 8 Controller Operation The BAUD rate of the serial communications may be programmed to 300 600 1200 or 2400 BAUD Use UP or DOWN to change the BAUD rate value 2400 b New BAUD rate Press SET to set the BAUD rate to the new value or EXIT to abort the oper
65. rument to freeze the displayed well tem perature This feature is provided on all units Fan The fan inside the calibrator runs continuously when the unit is be ing operated to provide cooling for the instrument There are two speeds a slow speed for control operation and a faster speed for rapid cooling Slots at the top and around the four corners of the calibrator are provided for airflow The area around the calibrator must be kept clear to allow ad equate ventilation The air is directed upward and as a result the air coming from around the block can be extremely hot 6 2 Front Panel Ths front panel is shown in Figure 3 on page 17 Controller Display The digital display is an important part of the tem perature controller because it not only displays set and actual tempera tures but also various calibrator functions settings and constants The display shows temperatures in units according to the selected scale C or F Controller Keypad The four button keypad allows easy setting of the set point temperature The control buttons SET DOWN UP and EXIT are used to set the calibrator temperature set point access and set other operating parameters and access and set calibration parameters Setting the control temperature is done directly in degrees of the current scale It can be set to one hundredth of a degree C or F The functions of the buttons are as follows SET Used to display the next parameter in the
66. s the switch is closed and o means the switch is open The status flashes when the switch is in its active position opposite the normal position The hold temperature shows what the temperature of the well was when the switch changed from its normal po sition to its active position While the switch is in the normal position the hold temperature will follow the well temperature Operation of the hold temperature display is outlined below 143 56 C Well temperature display U Access hold display c 144 8C Switch status and hold temperature Note that the hold function display is not accessible if the function mode is set to OFF To return to the normal well temperature display press DOWN or EXIT 8 5 2 Mode Setting The temperature hold feature has three modes of operation In the nor mally closed n c mode the hold temperature display freezes when the switch opens In the normally open n o mode the hold temperature dis play freezes when the switch closes Whenever the switch is in the nor mal position the hold temperature follows the well temperature There is also an automatic mode In this mode the normal position is set to whatever the switch position is when the set point is changed For ex ample if the switch is currently open when the set point is changed the 26 Manual Rev 050801 9127 8 Controller Operation closed position then becomes the new active position The normal posi tion
67. s the user to pro gram a number of set points and have the dry well automatically cycle between the temperatures holding at each for a determined length of time The user can select one of four different cycle functions The program parameter menu is accessed by pressing SET and then UP 100 00 C Well temperature S U Access program menu ProG Program menu Hart Scientific Manual Rev 050801 29 8 Controller Operation 90 85 80 75 70 65 60 55 50 45 40 Time Deg C Figure 6 Switch Test Data Press SET to enter the program menu S Enter program menu 8 6 1 Number of Program Set points The first parameter in the program menu is the number of set points to cycle through Up to 8 set points can be used in a ramp and soak pro gram Pn 8 Number of program set points Use the UP or DOWN buttons to change the number from 2 to 8 Pn 3 New number of program set points Press SET to continue Pressing EXIT will cause any changes made to the parameter to be ignored S Save new setting 8 6 2 Set points The next parameters are the program set points 1 50 0 First set point Use the UP or DOWN buttons to select any of the set points 3 150 0 Third set point Press SET to be able to change the set point C 150 00 Set point value Use UP and DOWN to change the set point value C 165 00 New set point value Press SET
68. setting Hart Scientific Manual Rev 050801 27 8 Controller Operation 8 5 4 Switch Wiring The thermal switch or cut out is wired to the calibrator at the two termi nals at the back of the dry well calibrator labeled DISPLAY HOLD The switch wires may be connected to the terminals either way Internally the black terminal connects to ground The red terminal connects to 5V through a 10 k resistor The calibrator measures the voltage at the red terminal and interprets 5V as open and 0V as closed 8 5 5 Switch Test Example This section describes a possible application for the temperature hold feature and how the instrument is set up and operated Suppose you have a thermal switch which is supposed to open at about 75 C and close at about 50 C and you want to test the switch for accu racy and repeatability You can use the temperature hold feature and the ramp and soak feature described in detail in the next section to test the switch Measurements can be made by observing the display or prefera bly by collecting data using a printer or computer connected to the RS 232 port To set up the test do the following steps 1 Connect the switch wires to the terminals on the back of the dry well and place the switch in the well The operator should wear a grounding strap when connecting the switch to the terminals if the unit is powered on 2 Enable set point scanning by setting the scan to ON in the primary menu
69. strings and will simply be ignored Backspace BS ASCII 8 may be used to erase the previous character A terminating CR is implied with all com mands 46 Manual Rev 050801 9127 9 Digital Communication Interface Hart Scientific Manual Rev 050801 47 9 Digital Communication Interface Command Description Command Format Command Example Returned Returned Example Acceptable Values Display Temperature Read current set point s etpoint s set 9999 99 C or F set 150 00 C Set current set point to n s etpoint n s 450 Instrument Range Read scan function sc an sc scan ON or OFF scan ON Set scan function sc an on of f ON or OFF Turn scan function on sc an on sc on Turn scan function off sc an of f sc of Read scan rate sr ate sr srat 999 99 C or F min srat 10 0 C min Set scan rate to n degrees per minute sr ate n sr 5 1 to 100 C Read display temperature hold status hm ode hm hm OFF or AUTO or NO or NC Set display temperature hold mode hm ode OF F AU TO NO NC OFF or AUTO or NO or NC Set hold mode to off hm ode OF F hm of Set hold mode to automatic hm ode AU TO hm auto Set hold mode to normally open hm ode NO hm no Set hold mode to normally closed hm ode NC hm nc Read temperature t emperature t t 9999 99 C or F t 55 69 C Read hold status ho ld ho ho Closed or Open 9999 99 C or F ho Open 75 0 C Secondary Menu
70. tallation CATEGORY II Pollu tion Degree 2 per IEC1010 1 Heating Time to Max 30 minutes Cooling Time 2 5 hours from 600 C to 100 C Controller Hybrid analog digital controller with data retention Heater 1000 W solid state relay switched Cooling 2 speed internal fan Fault Protection Sensor burnout protection over temperature thermal cut out electrical fuse 10 A 115 VAC 10 5A 230 VAC 10 Computer Interface RS 232 interface included with Model 9930 Inter face it for Windows control software Display LED C or F user selectable Heating and cooling times may be affected by line voltage and ambient temper atures Using a single 5626 12 at the bottom of the well Hart Scientific Manual Rev 050801 7 3 Specifications and Environmental Conditions 3 2 Environmental Conditions Although the instrument has been designed for optimum durability and trouble free operation it must be handled with care The instrument should not be operated in an excessively dusty or dirty environment Maintenance and cleaning recommendations can be found in the Mainte nance Section of this manual The instrument operates safely under the following conditions temperature range 5 50 C 41 122 F ambient relative humidity 15 50 pressure 75kPa 106kPa mains voltage within 10 of nominal vibrations in the calibration environment should be minimized altitu
71. ure user and instrument safety and protection The 9127 dry well calibrator was designed for portability moderate cost and ease of operation Through proper use the instrument should provide continued accurate calibration of temperature sensors and devices The user should be familiar with the safety guidelines and operating proce dures of the calibrator as described in the user manual 6 Manual Rev 050801 9127 2 Introduction 3 Specifications and Environmental Conditions 3 1 Specifications The following table lists the specifications for this instrument Accuracy specifications are applicable for a one year calibration interval In line with normal prudent metrology practices Hart Scientific recommends a short cycle interval of six months for new units during the first year Power 115 VAC 10 50 60 Hz 1000 Watts optional 230 VAC 10 50 60 Hz Ambient Temperature 5 50 C 40 120 F Operating Range 35 600 C 95 1112 F Resolution 0 01 C or F resolution Accuracy 0 1 C at 100 C 0 15 C at 300 C 0 5 C at 600 C 7A 23 5 C Uniformity up to 0 05 C using similar type probes Control Stability Peak to Peak 0 02 C to 300 C 0 05 C to 600 C typical 30 min utes Control Stability 2 0 02 C to 300 C 0 05 C to 600 C Test Well 1 45 dia x 6 deep Size 12 5 H x 8 W x 10 5 D 318 x 203 x 267 mm Weight 25 lb 11 4 kg Safety OVER VOLTAGE Ins
72. viate excessively from the set point due to vary ing external conditions This is because the power output changes very little with temperature and the controller cannot respond very well to changing conditions or noise in the system If the proportional band is too narrow the temperature may swing back and forth because the con troller overreacts to temperature variations For best control stability the proportional band must be set for the optimum width The proportional band width is set at the factory to about 8 0 C The pro portional band width may be altered by the user if he desires to optimize the control characteristics for a particular application The proportional band width is easily adjusted from the front panel The width may be set to discrete values in degrees C or F depending on the selected units The proportional band adjustment is be accessed within the secondary menu Press SET and EXIT to enter the secondary Hart Scientific Manual Rev 050801 33 8 Controller Operation menu and show the heater power Then press SET to access the pro portional band S E Access heater power in secondary menu 12 Pct Heater power in percent S Access proportional band Pb 4 01C Proportional band setting To change the proportional band press UP or DOWN Pb 10 00C New proportional band setting To accept the new setting and access the cut out set point press SET Pressing EXIT w
73. will be set automatically under any of the following conditions 1 a new set point number is selected 2 the set point value is changed 3 a new set point is set through the communications channels or 4 the ramp and soak program is running and automatically steps to the next set point in the sequence The automatic mode is useful for repetitive tests of the opening and closing temperatures of a switch The temperature hold feature can also be disabled by setting the mode to OFF The operating mode of the temperature hold is set in the primary menu after the scan rate setting HoLd OFF Hold mode set to off To change the mode press UP or DOWN HoLd Aut Automatic mode HoLd n c Normally closed mode HoLd n o Normally open mode Press SET to accept the displayed setting 8 5 3 Scan Hold In addition to controlling the hold temperature display a switch can also control set point scanning by enabling the scan hold function When the switch changes from its normal position to its active position scanning will stop For the scan hold to be effective scanning must be enabled and the scan rate should be set to a relatively low value see Sections 8 4 1 and 8 4 2 The scan hold is set in the primary menu after the temperature hold mode setting SHoLd OF Scan hold set to off To change the mode press UP or DOWN SHoLd On Scan hold set to on Press SET to accept the displayed

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