9141 User Manual
Contents
1. 6 1 6 2 General Operation Changing Display Units The 9141 can display temperature in Celsius or Fahrenheit The temperature units are shipped from the factory set to Celsius To change to Fahrenheit or back to Celsius there are two ways 1 Press the SET and UP simultaneously This will change display units 2 Press the SET key three times from the temperature display to show Press the UP or Down key to change units Press SET to store changes Switching to 230V Operation The 9141 is switchable from 115 VAC to 230 VAC 50 60 Hz Switching the voltage can change the calibration so the unit should be calibrated after changing the input voltage To change from 115 VAC to 230 VAC e Unplug the unit e Lay the unit down on its side e With a small straight slot screwdriver remove the fuse holder located on the rear panel Replace the two fuses 10 amp 250 V with 5 amp 250V fuses e Replace the fuse holder with the 230V in the display window e Using the same straight slot screwdriver move the heater switch to dis play 230V See the rear panel drawing in Figure 2 on page 15 NOTE If the heater switch and the fuse holder do not both read 230V when complete the unit will either not heat or only heat at a fraction of its capacity Ifnot done properly the unit could become damaged and void the calibration and warranty Use 10 amp fuses for 115V and 5 amp for 230V only2. EXIT Y lt lt EXIT Scan On Off Y I lt EXIT Display Power SET I Y SET I EXIT Scan Rate y lt EXIT Set Proportional Band SET s E T EXIT Y n Configuration Menu SET 4 LY EXIT EXIT Cal gt Operating Lud Serial Menu 4 DOWN Parameters pow Interface Menu Menu ser X5 SET SET BAUD SET EXIT SET EXIT gt SET EXIT I Adjust Adj RO Adj HL BAUD Rate T I SET EXIT SET EXIT SET EXIT Y s Sample ALPHA lt Period SET EXIT SET EXIT i Adj Sample SET EXIT SET EXIT Duplex DELTA lt Mode Je SET EXIT gt SET EXIT Adj Duplex SET EXIT SET EXIT Y Linefeed j SET EXIT gt Adjust Linefeed SET EXIT p Figure 5 Controller Operation Flowchart 22 7 Controller Operation Temperature Set point 7 2 2 7 2 3 Well temperature in degrees Celsius Press SET to accept the new selection and access the set point value SET Accept selected set point memory Set point Value The set point value may be adjusted after selecting the set point memory and pressi
3. Hart Scientific 9 9141 Dry Well Calibrator User s Guide Rev 5B0702 Fluke Corporation Hart Scientific Division 799 E Utah Valley Drive e American Fork UT 84003 9775 USA Phone 1 801 763 1600 Telefax 1 801 763 1010 E mail support hartscientific com www hartscientific com Subject to change without notice Copyright O 2005 Printed in USA Rev 5B0702 Table of Contents 1 Before You Start 1 1 1 symbols Used sa Aa 3 42 2 a UR ERA ARM 1 1 2 Safety Information 2 een 2 1 2 1 WARNINGS c e race acea UNA nk a dy Qir d dt Yar Ae 2 1 2 2 CAUTIONS 5 av y a ce TR DR iia ito 4 1 3 Authorized Service Centers cesor s a ki l anl W 4 a 6 2 Introduction 9 3 Specifications and Environmental Conditions 11 3 1 Specifications or soma al len gl ke eR A Y k 11 3 2 Environmental Conditions 11 3 3 Warranty o cu s l A na eee WU RIS ue ee 12 4 Quick Start see seaca n ROO ee a 4 aa RR oes lS 4 1 Unpacking as s s2 sn 2a a ik E 4 al A ERR RUE Ra 13 4 2 Seb Da o o ee os Baa A A e 13 4 3 POWe s x Soe Hae rem RR RS RUSSE N ERS Re A 14 4 4 Setting the Temperature e as llle 14 5 Parts and Controls 15 5 1 Bottom Panel 4 22 4x4 2 daray S Rx Ae n eye ea 15 5 2 Front Panel Ls us taa ee aw eee ee Ae a 2 d 16 5 3 Co
4. C and 1 5 C above 450 C Calibration Points In calibrating the dry well Rp ALPHA and DELTA are adjusted to minimize the set point error at each of three different dry well temperatures Any three reasonably separated temperatures may be used for the calibration Improved results can be obtained for shorter ranges when using temperatures that are just within the most useful operating range of the dry well The farther apart the calibration temperatures the larger will be the calibrated temperature range but the calibration error will also be greater over the range If for instance 150 C to 350 C is chosen as the calibration range then the calibrator may achieve an ac curacy of say 0 3 C over the range 150 to 350 C Choosing a range of 200 C to 300 C may allow the calibrator to have a better accuracy of maybe 0 2 C over the range 175 to 325 C but outside that range the accuracy may be only 0 5 C Calibration Procedure 1 Choose three set points to use in the calibration of the R ALPHA and DELTA parameters These set points are generally 50 C 250 C and 450 C but other set points may be used if desired or necessary 2 Set the dry well to the low set point When the dry well reaches the set point and the display is stable wait 15 minutes or so and then take a reading from the thermometer Sample the set point resistance by holding down the SET key and pressing the DOWN key Write these values down as T and R respect
5. DO NOT PLUG THE UNIT INTO 230 V IF THE HEATER SWITCH AND FUSE HOLDER READ 115 THIS WILL CAUSE THE FUSES TO BLOW AND MAY DAMAGE THE INSTRUMENT 19 7 Controller Operation Well Temperature 7 1 7 2 7 2 1 Controller Operation This chapter discusses in detail how to operate the dry well temperature con troller using the front control panel Using the front panel key switches and LED display the user may monitor the well temperature set the temperature set point in degrees C or F monitor the heater output power adjust the control ler proportional band and program the calibration parameters operating pa rameters and serial interface configuration Operation of the functions and parameters are shown in the flowchart in Figure 5 on page 22 This chart may be copied for reference In the following discussion a button with the word SET UP EXIT or DOWN inside indicates the panel button while the dotted box indicates the display reading Explanation of the button or display reading are to the right of each button or display value Well Temperature The digital LED display on the front panel allows direct viewing of the actual well temperature This temperature value is what is normally shown on the dis play The units C or F of the temperature value are displayed at the right For example Well temperature in degrees Celsius The temperature display function may be accessed from any other function by pressing the
6. 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 10 minutes to achieve maximum stability Speeding up the calibration process can be accomplished by knowing how soon to make the measurement It is recommended that typical measurements be made at the desired temperatures with the desired test probes to establish these times 9 Test Probe Calibration Dry well Characteristics 600 500 400 300 200 o o 2 3 2 S S o 2 5 E x o 9 a 100 Ambient 6 8 Time in Minutes Figure 7 Typical Heating Rate 540 430 320 210 Block Temperature C 100 Ambient 12 16 Time in Minutes Figure 8 Typical Cooling Rate 41 10 Calibration Procedure Calibration Points 10 10 1 10 2 10 2 1 Calibration Procedure Sometimes the user may want to calibrate the dry well to improve the tempera ture set point accuracy Calibration is done by adjusting the controller probe calibration constants Rg ALPHA and DELTA 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 measure the well temperature with higher accuracy than the desired accuracy of the dry well By using a good thermometer and following this procedure the dry well can be calibrated to an accuracy of better than 0 5 C up to 450
7. determines that the defect or malfunction has been caused by misuse alteration abuse or abnormal condi tions or operation or handling Hart will repair the product and bill the pur chaser for the reasonable cost of repair To exercise this warranty the purchaser must forward the product after calling or writing a Hart Scientific Authorized Service Center see Section 1 3 for au thorization The Service Centers assume NO risk for in transit damage 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 DAM AGES OR LOSS WHETHER IN CONTRACT TORT OR OTHERWISE 4 Quick Start Unpacking 4 1 4 2 Quick Start Unpacking Unpack the dry well carefully and inspect it for any damage that may have oc curred during shipment If there is shipping damage notify the carrier immediately Verify that the following components are present e 9141 Dry well e 3141 2 Insert A e Power Cord e Manual e Report of Calibration e Calibration Label e Heat Shield e 9930 e RS 232 Cable e Insert Removal Tool Set Up Place the calibrator on a flat surface with at least 6 inches of free space around and 18 inches above the instrument Plug the power cord into a groun
8. in its active position op posite the normal position The hold temperature shows what the temperature of the well was when the switch changed from its normal position 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 out lined below 143 5 C Well temperature display Access hold display m E ug Switch status and hold temperature To return to the normal well temperature display press DOWN Mode Setting The Hold Function is always in the automatic mode In this mode the normal position is set to whatever the switch position is when the set point is changed For example if the switch is currently open when the set point is changed the closed position then becomes the new active position The normal position is 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 The operating mode of the temperature hold is set in the primary menu after the scan rate setting Switch Wiring The thermal switch or cutout is wired to the calibrator at the two terminals in the front of the dry well calibrator labeled SWITCH HOLD The switch wires may be connected to the terminals either way Internally the black termi nal connects to ground The red terminal connects to 5V through a 1
9. of parameters Legend Note Optional Command data Returns either information n Numeric data supplied by user 9 Numeric data returned to user x Character data returned to user When DUPLEX is set to FULL and a command is sent to READ the command is returned followed by a carriage return and linefeed Then the value is returned as indicated in the RETURNED column 37 9 Test Probe Calibration Calibrating a Single Probe 9 1 9 2 9 2 1 9 2 2 Test Probe Calibration For optimum accuracy and stability allow the calibrator to warm up for 10 minutes after power up and then allow adequate stabilization time after reach ing the set point temperature After completing operation of the calibrator al low the well to cool by setting the temperature to 100 C for one half hour before switching the power off Calibrating a Single Probe 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 inserted into the well allow ade quate stabilization time to allow the test probe temperature to settle as de scribed above Once the probe has settled to the temperature of the well it may be compared to the calibr
10. on page 16 Controller Display The digital display is an important part of the temperature controller because it not only displays set and actual temperatures but also vari ous calibrator functions settings and constants The display shows tempera tures in units according to the selected scale C or F 16 5 Parts and Controls Constant Temperature Block Assembly 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 tenth of a degree Celsius or Fahrenheit The functions of the buttons are as follows SET Used to display the next parameter in the menu and to store parameters to the displayed value DOWN Used to decrement the displayed value of parameters UP Used to increment the displayed value EXIT Used to exit a function and skip to the next function Any changes made to the displayed value are ignored 5 3 Constant Temperature Block Assembly Figure 4 on page 17 5 3 1 Constant Temperature Block The Block is made of aluminum bronze and provides a relatively constant and accurate temperature environment for the sensor that is to be calibrated A 28 6 mm 1 125 inch diameter w
11. parameters menu The serial interface parameters menu contains parameters which determine the operation of the serial interface These controls only apply to instruments fitted with the serial interface The parameters in the menu are BAUD rate sample period duplex mode and linefeed Baud Rate The baud rate is the first parameter in the menu The baud rate setting deter mines the serial communications transmission rate The baud rate parameter is indicated by bRUd Serial BAUD rate parameter Press SET to choose to set the baud rate The current baud rate value will then be displayed 2400 b Current baud rate The baud rate of the serial communications may be programmed to 300 600 1200 2400 4800 or 9600 baud Use UP or DOWN to change the baud rate value u800 b i New baud rate 7 Controller Operation Serial Interface Parameters 7 11 2 7 11 3 7 11 4 Press SET to set the baud rate to the new value or EXIT to abort the opera tion and skip to the next parameter in the menu 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 temperature measure ments transmitted from the serial interface If the sample rate is set to 5 the in strument transmits the current measurement over the serial interface approximately every five seconds The automatic sampling is disabled with a sample
12. po 999 9 po 1 3 duty cycle Configuration Menu Calibration Parameters Menu Read RO calibration parameter 0 r r0 999 999 r0 100 578 Set RO calibration parameter ton r 0 n r 100 324 98 0 to 104 9 Read ALPHA calibration al pha al al 9 9999999 8l 0 0038573 parameter Set ALPHA calibration parameter al pha n al 0 0038433 002 to 006 ton Read DELTA calibration dellta de de 9 9999 de 1 507 parameter Set DELTA calibration parameter deflta n de 1 3742 0 3 0 Operating Parameters Menu Read High Limit hl hl hl 999 hl 600 Set High Limit hl n hl 600 100 650 36 8 Digital Communication Interface Interface Commands 9141 communication commands continued Command Command Returned Acceptable Command Description Format Example Returned Example Values Serial Interface Menu Read serial sample setting sa mple sa sa 9 sa 1 Set serial sampling setting ton sa mple n sa 0 0 to 999 seconds 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 Iffeed on of f ON or OFF Set serial linefeed mode to on Iffeed on If on Set serial linefeed mode to off Iffeed of f If of Miscellaneous Read firmware version number ver sion ver ver 9999 9 99 ver 9141 1 21 Read structure of all commands h elp h list of commands Read ALL operating parameters all all list
13. si cx RR door RS amp 4 2 4 41 Typical Cooling Rate 2 k 4 Q e di 41 1 Before You Start Symbols Used 1 1 Before You Start Symbols Used Table 1 lists the International Electrical Symbols Some or all of these symbols may be used on the instrument or in this manual Table 1 International Electrical Symbols Symbol Description Z AC Alternating Current e AC DC Battery Mm CE Complies with European Union Directives DC Double Insulated Electric Shock Fuse PE Ground Hot Surface Burn Hazard Read the User s Manual Important Information Off ObP l gt Ol gt n On 9141 Dry well Calibrator User s Guide Symbol Description Canadian Standards Association US OVERVOLTAGE Installation CATEGORY II Pollution Degree 2 per IEC1010 1 re CATI fers to the level of Impulse Withstand Voltage protection provided Equipment of OVERVOLTAGE CATEGORY II is energy consuming equipment to be supplied from the fixed installation Examples include household office and laboratory appliances C TIC Australian EMC Mark i The European Waste Electrical and Electronic Equipment WEEE Directive 2002 96 EC mark 1 2 Safety Information Use this instrument only as specified in this manual Otherwise the protection provided by the instrument may be impaired The following definitions apply to the terms Warning and Caution e Wa
14. temperature ser Hex Access heater power in secondary menu SEC Flashes SEC for secondary menu and then displays the hu l ek Tv To exit out of the secondary menu press EXIT To continue on to the propor tional band setting function press SET Proportional Band In a proportional controller such as this the heater output power is proportional 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 bot tom of the proportional band the heater output is 100 At the top of the pro portional 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 If the band is too wide the well temperature will deviate excessively from the set point due to varying external conditions This is be cause 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 be cause the controller overreacts to temperature variations For best control stabil ity the proportional band must be set for the optimum
15. 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 Communications commands are summarized in Table 2 on page 36 Serial Communications The calibrator is installed with an RS 232 serial interface that allows serial dig ital communications over fairly long distances With the serial interface the user may access any of the functions parameters and settings discussed in Section7 with the exception of the BAUD rate setting Wiring The serial communications ca RS 232 Cable Wiring for ble attaches to the calibrator IBM PC and Compatibles through the D 9 connector at the back of the instrument Fig ure 6 shows the pin out of this Instrument Computer DTE connector and suggested cable Connector Connector wiring The serial cable should DB 9 Pin DB 9 Pin be shielded If the unit is used 1NC 1DCb in a heavy industrial setting the iie d iie es 1 y selung 3TxD T dl 3T serial cable must be limited to 4NC LE 4 DTR ONE meter 5GND 5GND 6NC 6 DSR 7 RTS RR TT 7RTS Setu p 8 CTS AAA 8 CTS 9NC 9NC Before operation the serial in terface must first be set up by programming the BAUD rate Instrument Computer DTE and other configuration param Connector Connector eters These parameters are pro PB Pin DB 25 Pin grammed within the serial Ne interf Th ial
16. 00 kQ re 25 9141 Dry well Calibrator User s Guide sistor The calibrator measures the voltage at the red terminal and interprets 5V as open and OV as closed 7 4 4 Switch Test Example 26 7 5 7 6 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 to see how accurate and repeatable it is You can use the temperature hold feature and the scan function to test the switch Measurements can be made by observing the display or pref erably by collecting data using a 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 front of the dry well and place the switch in the well 2 Enable set point scanning by setting the scan to ON in the primary menu see Section 7 3 1 3 Set the scan rate to a low value say 1 0 C min see Section 7 3 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 first program set point to a value below the expected lower switch temperature say 40 C in the program menu 5 Set the second program set point to a va
17. 1 a heater error the fan will go on high speed Initialize the system by performing the Factory Reset Sequence described above If the unit repeats the error code contact a Hart Scientific Authorized Service Center for assistance Err Err Temperature cannot be set above a cer tain point Incorrect High Limit parameter The High Limit parameter may be set below 125 C Check this value as described in Section 7 10 Operating Parameters AC voltage is pres ent on the insert or block Improper Wiring Use a wall plug tester to check the main power plug at the wall Power Cord Check the cord for continuity on the ground prongs If the resistance is greater than one ohm replace it Dielectric Test Use an ohmmeter to check the continuity between the ground prong on the PEM and the insert If the resistance reading is greater then three ohms contact a Hart Scientific Authorized Service Center for assistance Power up Fuse The unit is equipped with external operator accessible fuses If a fuse blows it may be due to a power surge or failure of a component Replace the fuse once DO NOT replace the fuse with one of a higher current rating Always replace the fuse with one of the same rating voltage and type If the fuse blows a second time itis likely caused by failure of a component part Contact a Hart Scientific Autho rized Service Center Section 1 3 for assistance CE Comments EMC Directive Hart Scienti
18. 30 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 Setting the Temperature Section 7 2 explains in detail how to set the temperature set point on the cali brator 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 store 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 displayed well tempera ture will gradually change until it reaches the set point temperature The well may require 5 to 10 minutes to reach the set point depending on the span An other 5 to 10 minutes is required to stabilize within 0 1 C of the set point Ul timate stability may take 15 to 20 minutes more of stabilization time 5 Parts and Controls Bottom Panel 5 Parts and Controls The user should become familiar with the dry well calibrator and its parts 5 1 Bottom Panel Figure 2 on page 15 Power Cord Underneath the calibrator is the removable power cord inlet that plugs into an IEC grounded socket Power Switch The power switch is l
19. A diya oe A A vy w d n ww W 29 7 9 2 ALPHA A AA a A a TA 29 7 9 3 DELLA i x n 3 4 end IA a Be eh ede ee kev a d A OD 29 7 10 Operating Parameters lt lt llle 29 7 11 Serial Interface Parameters K K K K K I 30 FALL Baud R te 52 22 xala ne div en ia d ye SD 6 30 7 11 2 Sample Periodi seie ue aen m een OB m dd 31 7 11 3 D plex Mode gt 5c oer ds oy ed e wad Sle Xs 31 7 11 4 PETIOLES a os zado a RR nien posh ed qr de TUN Pas 31 8 Digital Communication Interface 33 8 1 Serial Communications a s s ea s es rsat resa 33 8 1 1 WHINE 20e do eve a W Qi Ma OE Qend dee dih W l pedo 4 33 8 1 2 Setup e cie e s n ese G n dau Mele qi ux TOC dq axe 33 SLAI BARDE i dece l Qed dib os Nb Goes he Hid ur e o 34 3 1 2 2 Sample Period 4 kas guo d dogm y av kan Re s 34 S123 Duplex Moe en a toe Si aoa whe woe d Ros e aw e el w d b tene d 34 S124 JTanefeedi 2 ai a RR A Dae TS 34 8 1 3 Serial Operation aaae a as ROS ADR WHER WO 34 8 2 Interface Commands l l sn 35 9 Test Probe Calibrati0M 39 9 1 Calibrating a Single Probe 2 2 e a ee 39 9 2 Dry well Characteristics oo 4l kala a a ee a 39 9 2 1 Heating and Cooling Rates s a amp 2 o ee e 39 9 2 2 Stabilization and Accuracy o o o o o 39 10 Cal
20. EXIT button Temperature Set point The temperature set point can be set to any value within the range and resolu tion as given in the specifications Be careful not to exceed the safe upper tem perature limit of any device inserted into the well Setting the temperature involves two steps 1 select the set point memory and 2 adjust the set point value 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 21 9141 Dry well Calibrator User s Guide Display gt UP Temperature Switch Hold Display Mode DOWN SET Y gt SET DOWN j EXIT Select Setpoint Toggles Display of Rs SET Y SET UP EXIT Adjust Setpoint I Toggles C F SET Y eS EXIT Units C F Secondary Functions I SET L gt SET
21. WN keys and then pressing SET See Figure 5 on page 22 Calibration Parameters The operator of the instrument controller has access to a number of the calibra tion constants namely RO ALPHA and DELTA These values are set at the factory and must not be altered The correct values are important to the accu racy and proper and safe operation of the instrument Access to these parame ters is available to the user so that in the event that the controller memory fails 7 Controller Operation Operating Parameters 7 9 1 7 9 2 7 9 3 7 10 the user may restore these values to the factory settings The user should have a list of these constants and their settings with the instrument manual WARNING DO NOT change the values of the instrument calibration constants from the factory set values The correct setting of these parame ters is important to the safety and proper operation of the instrument The calibration parameters menu is indicated by Calibration parameters menu Press SET five times to enter the menu The calibration parameters menu contains the parameters R ALPHA and DELTA which characterize the re sistance temperature relationship of the platinum control sensor These parame ters may be adjusted to improve the accuracy of the calibrator The calibration parameters are accessed by pressing SET after the name of the parameter is displayed The value of the parameter may be changed u
22. ator display temperature The display temperature should be stable to within 0 1 C degree for best results CAUTION 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 Dry well Characteristics 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 However actual heat losses will vary with design of the thermometer probes inserted into the calibrator and the temperature For best results insert probe to full depth of well Heating and Cooling Rates Figures 7 and 8 show typical heating cooling rates of the 9141 dry well calibrator DO NOT remove inserts when heating or when the unit is hot Stabilization and Accuracy The stabilization time of the dry well calibrator will depend on the conditions and temperatures involved Typically the test well will be stable to 0 1 C within 5 minutes of reaching the set point temperature as indicated by the display Ul timate stability will be achieved 10 to 20 minutes after reaching the set temperature 39 9141 Dry well Calibrator User s Guide 40 Inserting a cold probe into a well will require another period of stabilizing de pending on the magnitude of the disturbance and the required accuracy For ex ample inserting
23. ded mains outlet Observe that the nominal voltage corresponds to that indicated on the back of the calibrator Place the heat shield on the unit to deflect high tempera tures from the probe hubs see Figure 1 on page 5 CAUTION The heat shield may become very hot Use extreme caution Carefully insert the probe sleeve into the well DO NOT drop the sleeve in the well Probe sleeve holes should be of the smallest diameter possible while still allowing the probe to slide in and out easily Sleeves with various hole sizes are available from Hart Scientific 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 Turn on the power to the calibrator by toggling the switch on the power entry module The fan should begin quietly blowing air through the instrument and the controller display should illuminate after 3 seconds After a brief self test the controller should begin normal operation If the unit fails to operate please check the power connection 13 9141 Dry well Calibrator User s Guide 4 3 4 4 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 Power Plug the dry well power cord into a mains outlet of the proper voltage fre quency and current capability Typically this will be 115 VAC 410 50 60 Hz 2
24. e the equipment turn power off and discon nect power cord 1 2 2 CAUTIONS To avoid possible damage to the instrument follow these guidelines Always operate this instrument at room temperature between 41 F and 122 F 5 C to 50 C Allow sufficient air circulation by leaving at least 6 inches 15 cm of clearance around the instrument Component lifetime can be shortened by continuous high temperature op eration Hart Scientific strongly recommends using the heat shield Figure 1 pro vided while operating the calibrator at temperatures above 200 C The heat shield protects the hub on the probes from heat and reduces the risk of the user being burned by the hub The heat shield gets very hot and 1 Before You Start Safety Information does not prevent all heat from reaching the hub Be careful when remov ing the heat shield or the probe from the well Figure 1 Heat shield installed on 914 1calibrator DO NOT apply any type of voltage to the display hold terminals Apply ing a voltage to the terminals may cause damage to the controller DO NOT use fluids to clean out the well Fluids could leak into electron ics and damage the instrument Never introduce any foreign material into the probe hole of the insert Fluids etc can leak into the instrument causing damage DO NOT change the values of the calibration constants from the factory set values The correct setting of these parameters is important to the saf
25. ection 1 3 for assistance Be sure to have the instru ment s model number serial number voltage and problem description available Problem Possible Causes and Solutions Incorrect tempera Incorrect RO ALPHA DELTA or BETA parameters Find the value for RO AL ture reading PHA DELTA and BETA on the Report of Calibration Reprogram the parameters into the instrument see Section 7 9 Calibration Parameters Allow the instrument to stabilize and verify the accuracy of the temperature reading Controller locked up The controller may have locked up due to a power surge or other aberration Initialize the system by performing the Factory Reset Sequence Factory Reset Sequence Hold SET and EXIT down at the same time while turning on the instrument The instrument displays shows init the model number and the firmware version release SET and EXIT Each of the controller param eters and calibration constants must be reprogrammed The values can be found on the Report of Calibration The instrument Incorrect scan and scan rate settings The scan and scan rate settings may be heats or cools too set to unwanted values Check the Scan and Scan Rate settings The scan may be quickly or too slowly off if the unit seems to be responding too quickly The scan may be on with the Scan Rate set low if unit seems to be responding too slowly Improper line voltage Verify that the voltage reading in the bo
26. ed with SPEr The sample period is the time period in seconds between temperature measurements transmitted from the serial interface If the sample rate is set to 5 for instance then the instrument will transmit 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 pe riod Adjust the period with UP or DOWN and then use SET to set the sample rate to the displayed value Duplex Mode The next parameter is the duplex mode indicated with dUPL The duplex mode may be set to half duplex HALF or full duplex FULL With full duplex any commands received by the thermometer via the serial interface are immediately echoed or transmitted back to the device of origin With half du plex the commands are executed but not echoed The default setting is full du plex The mode may be changed using UP or DOWN and pressing SET Linefeed The final parameter in the serial interface menu is the linefeed mode This pa rameter enables On or disables OFF transmission of a linefeed charac ter 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 Serial Operation Once the cable has been attached and the interface set up properly the c
27. ell is provided that may be used for sensors of that size or may be sleeved down with various sized multi hole probe sleeves Heaters surround the block assembly and provide even heat to the sensor A high temperature platinum RTD is imbedded at the base of the block assembly to sense and control the temperature of the block The entire assembly is sus pended in an air cooled chamber thermally isolated from the chassis and electronics Interchangeable Insert Options Insert A Insert B Insert C Insert D 1 4 yir 4 mm 1 2 1 8 Figure 4 Inserts available for the 9141 block assembly 17 9141 Dry well Calibrator User s Guide A CAUTION The block vent cover may be very hot due to the fan blowing upward Please use caution 5 3 2 Probe Sleeves and Tongs The calibrator is supplied with a multi hole aluminum bronze probe sleeve for insertion into the calibrator well and tongs for removing sleeves Probe sleeves of various hole sizes are available to allow the user s probe to fit snugly into the well whatever the diameter of the probe One insert whichever is ordered is shipped with the unit e Insert A variety block 1 2 3 8 3 16 1 8 and 1 16 holes e Insert B comparison block two 3 8 two 1 4 and two 3 16 holes e Insert C 1 4 comparison block six 1 4 holes or e Insert D metric block two 3 mm two 4 mm and two 6 mm holes 6 General Operation Changing Display Units
28. er the calibrated range 2 If dry well does not pass specification at all set points repeat the Calibra tion Procedure 45 11 Maintenance 11 Maintenance e 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 instrument should require very little maintenance Avoid operating the instrument in an oily wet dirty or dusty environment e 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 e tis important to keep the well of the calibrator clean and clear of any for eign matter Do not use fluid to clean out the well e The dry well calibrator should be handled with care Avoid knocking or dropping the calibrator e For dry wells with removable probe sleeves the sleeves can become cov ered 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 e Ifa sleeve should be dropped examine the sleeve for deformities before inserting it in the well If there is any chance of jamming the sleeve in the well file or grind off the protuberance e Do not slam the probe stems into the well This type of action can cause a shock to the
29. ety and proper operation of the calibrator DO NOT slam the probe sheath in to the well This type of action can cause a shock to the sensor and affect the calibration The instrument and any thermometer probes used with it are sensitive in struments that can be easily damaged Always handle these devices with care DO NOT allow them to be dropped struck stressed or overheated The Factory Reset Sequence see Section 12 Troubleshooting should be performed only by authorized personnel if no other action is successful in correcting a malfunction You must have a copy of the most recent Report of Calibration to restore the calibration parameters 9141 Dry well Calibrator User s Guide DO NOT operate this instrument in an excessively wet oily dusty or dirty environment Always keep the well and inserts clean and clear of foreign material 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 instrument in an upright position to prevent the probe sleeves from dropping out The convenient handle allows for hand carrying the instrument If a mains supply power fluctuation occurs immediately turn off the in strument Power bumps from brown outs could damage the instrument Wait until the power has stabilized before re energizing the instrument Allow for probe expansion inside the well as the block heats Most probes
30. fic s equipment has been tested to meet the European Electromag netic Compatibility Directive EMC Directive 89 336 EEC The Declaration of Conformity for your instrument lists the specific standards to which the unit was tested 12 Troubleshooting CE Comments 12 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 the IEC 1010 2 010 EN 61010 2 010 standards 51
31. have handle temperature limits Be sure that the probe handle temperature limit is not exceeded in the air above the instrument 1 3 Authorized Service Centers Please contact one of the following authorized Service Centers to coordinate service on your Hart product Fluke Corporation Hart Scientific Division 799 E Utah Valley Drive American Fork UT 84003 9775 USA Phone 1 801 763 1600 Telefax 1 801 763 1010 E mail support hartscientific com Fluke Nederland B V Customer Support Services Science Park Eindhoven 5108 5692 EC Son NETHERLANDS Phone 31 402 675300 Telefax 31 402 675321 E mail ServiceDesk fluke nl Fluke Int l Corporation Service Center Instrimpex 1 Before You Start Authorized Service Centers Room 2301 Sciteck Tower 22 Jianguomenwai Dajie Chao Yang District Beijing 100004 PRC CHINA Phone 86 10 6 512 3436 Telefax 86 10 6 512 3437 E mail xingye han fluke com cn Fluke South East Asia Pte Ltd Fluke ASEAN Regional Office Service Center 60 Alexandra Terrace 03 16 The Comtech Lobby D 118502 SINGAPORE Phone 65 6799 5588 Telefax 65 6799 5588 E mail antng singa fluke com When contacting these Service Centers for support please have the following information available Model Number Serial Number Voltage Complete description of the problem 2 Introduction Introduction The Hart Scientific 9141 High Temp Field Calibrator may be used as a por
32. ibration Procedure 43 10 1 Calibration Points o srs ce s souas toee na ed a a 43 10 2 Calibration Procedure II K K KIR K K K K K K KI 43 10 2 1 Compute DELTA cdas dela kun dln ah n r i ein ls Reap AH RE OR ede 43 10 2 2 Compute R amp ALPHA 5 4 do o so e ob ORG eS 44 10 2 3 Accuracy amp Repeatability o o ooo o 45 11 Maintenance ovo ox orc he RO E OO X xo oe AT 12 Troubleshooting 49 12 1 Troubleshooting Problems Possible Causes and Solutions 49 12 2 CE Comments oso aes Ga ee mE UR RR 50 12 2 1 EMC Directive s sd wo ex a he ROS d Re e pen 50 12 2 2 Low Voltage Directive Safety 2 KK KI KI KI o e KI 51 lii Figures and Tables Table 1 Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Table 2 Table 2 Figure 7 Figure 8 International Electrical Symbols oo 1 Heat shield installed on 914 1calibrator o 3 9141 Back Panel and Bottom KI K K K K K K 15 9141 Front Panels 244 3 s a va RR RR SR e AQ 16 Inserts available for the 9141 block assembly 17 Controller Operation Flowchart o o 22 Serial Cable Wining o sae al n an ak o OR eman ee a 33 9141 controller communications commands 36 9141 communication commands continued 37 Typical Heating Rates
33. int 2 RxD 2TxD interface menu The serial inter 3TxD 3 RxD face parameters menu is out 4NC 4RTS lined in Figure 5 on page 22 wc gt lt i re To enter the serial parameter TRIS deed a programming mode first press INC L e 20DTR EXIT while pressing SET and release to enter the second Figure 6 Serial Cable Wiring 33 9141 Dry well Calibrator User s Guide 34 8 1 2 1 8 1 2 2 8 1 2 3 8 1 2 4 ary menu Press SET repeatedly until the display reads CAL Press UP until the serial interface menu is indicated with SEr AL 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 Baud Rate The baud rate is the first parameter in the menu The display will prompt with the baud rate parameter by showing b AU g Press SET to choose to set the baud rate The current baud rate value will then be displayed The BAUD rate of the 9141 serial communications may be programmed to 300 600 1200 2400 4800 or 9600 baud The baud rate is pre programmed to 2400 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 Sample Period The sample period is the next parameter in the menu and prompt
34. ively 3 Repeat step 2 for the other two set points recording them as T R gt T4 and R respectively 4 Using the recorded data calculate new values for R ALPHA and DELTA parameters using the equations given below Compute DELTA A T T B T T 43 9141 Dry well Calibrator User s Guide Pees a eee 100 100 100 100 E R R F R R dia 2 BE DE CF T 3 Measured temperature using thermometer R 3 Value of R from display of 9141 Press SET and DOWN at the same time where T and R are the measured temperature and resistance at 50 0 C T and R are the measured temperature and resistance at 250 0 C T and R are the measured temperature and resistance at 450 0 C 10 2 2 Compute R amp ALPHA a T del 1 d 100 100 a T del j n 100 100 oro Bc Rii a a alpha RoR R a R a delta is the new value of DELTA computed above 5 Program the new values for DELTA delta Ro rzero and ALPHA alpha into the dry well with the following steps a Press SET and EXIT keys at the same time and then press SET until R is displayed 44 10 Calibration Procedure Calibration Procedure 10 2 3 b Press SET then use the UP or DOWN keys until the correct numerical setting is displayed Press SET to accept the new value c Repeat step b for ALPHA and DELTA Accuracy amp Repeatability 1 Check the accuracy of the dry well at various points ov
35. lue above the expected upper switch temperature say 90 C 6 Set the program soak time to allow enough time to collect a number of data points say 2 minutes 7 Collect data on a computer connected to the RS 232 port Refer to Section 8 for instructions on configuring the RS 232 communications interface Secondary Menu Functions which are used less often are accessed within the secondary menu The secondary menu is accessed by pressing SET and EXIT simulta neously and then releasing The first function in the secondary menu is the heater power display See Figure 5 on page 22 Heater Power The temperature controller controls the temperature of the well by pulsing 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 By knowing the amount of heating the user can tell if the calibrator is heating up to the set point cooling down or controlling at a constant temperature Monitoring 7 Controller Operation Proportional Band 7 7 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 100 0 C i Well
36. ng SET Wr lt ete If the set point value is correct then press EXIT to resume displaying the well temperature To change the set point values press SET and then press UP or DOWN to adjust the set point value 220 i 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 in stead then any changes made to the set point will be ignored SET Accept new set point value 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 tem perature set point and proportional band Press SET after adjusting the set point value to change display units Un Scale units currently selected Press UP or DOWN to change the units 23 9141 Dry well Calibrator User s Guide 24 7 3 7 3 1 7 3 2 New units selected Scan The scan rate can be set and enabled so that when the set point is changed the dry well heats or cools at a specified rate degrees per minute until it reaches the new set point With the scan disabled the dry well heats or cools at the maximum possible rate Scan Control The scan is controlled with the scan on off function that appears in the main menu after the temperature scale units Gc OFF i Scan f
37. nstant Temperature Block Assembly 17 5 3 1 Constant Temperature Block lt ka ak ak W ee 17 5 3 2 Probe Sleeves and Tongs 0 492 a9 2 2 Wn aA ala amp 4Q AA Ana 18 6 General Operation o 19 6 1 Changing Display Units oo KI KI K K 19 6 2 Switching to 230V Operation AL KK KK K K K K KI 19 7 Controller Operation 21 7 1 Well Temperature 3 a 4 5 584 e e SOE A UE Y a 21 7 2 Temperature Set point ss c a 2 leen 21 7 2 1 Programmable Set point 442 444 04 o a al m Wa ge RR a 21 7 2 2 Setpoint Valu 4 o ta Sw Xaka Ye din elan WO ag 23 7 2 3 Temperature Scale Units lt queues a Rede a alv amp 23 ii 7 3 CAM ur mE aod a eu eeu ds ee IS IHR UE des 24 7 3 1 Scan Control RP Cc DIDIT 24 7 3 2 SCA Kal us cc ub Au O ak w l qe 24 7 4 Temperature Display Hold o o 25 7 4 1 Hold Temperature Display o e 25 7 4 2 Mode Setting ue oi a a ss ics 25 7 4 3 Switch Wiring PX e A TT 25 7 4 4 Switch Test Example eos a Sir a Re eS e GE 26 7 5 Secondary Menu a a s na ans a a EUEGEUR E RU 26 7 6 Heater POWeE ew 684 ocu 8 3m et aaa 26 17 Proportional Band o 27 7 8 Controller Configuration KK KI KI KI K K K K K K K 28 7 9 Calibration Parameters K K K K K K KI 28 7 9 1 Re
38. ocated on the power entry module PEM The PEM also houses the fuses and the dual voltage selector The PEM and Heater Voltage Switch see below allow the unit to be field switchable for 115 VAC 10 or 230 VAC 10 operation A Power qi 115VAC 10A 230VAC5A 50 60 Hz E 115V 10 AF 250V HEATER E 230V 5 AF 250V VOLTAGE SWITCH A HEATER VOLTAGE SWITCH Back View Bottom View Figure 2 9141 Back Panel and Bottom 15 9141 Dry well Calibrator User s Guide Heater Voltage Switch To be used only when changing the input voltage See Section 6 2 for instructions on changing the input voltage A NOTE The input voltage and heater voltage switch settings should al ways be the same value Serial Port A DB 9 male connector is present for interfacing the calibrator to a computer or terminal with serial RS 232 communications Fan The fan inside the calibrator runs continuously when the unit is being op erated to provide cooling for the instrument It has two speeds a slow speed for control operation and a faster speed for rapid cooling Slots at the top and around the two corners of the calibrator are provided for airflow The area around the calibrator must be kept clear to allow adequate ventilation The air flow is directed upward and can be extremely hot 5 2 914 DRY WELL CALIBRATOR 50 C to 650 C Hart Scientific SWITCH DOWN UP EXIT we 666 Figure 3 9141 Front Panel Front Panel Figure 3
39. ontrol ler immediately begins 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 8 Digital Communication Interface Interface Commands 8 2 temperature set point and view or program the various parameters The inter face commands are discussed in Section All commands are ASCII character strings terminated with a carriage return character CR ASCII 13 Interface Commands The various commands for accessing the calibrator functions via the digital in terfaces are listed in this section see Table 2 These commands are used with the RS 232 serial interface 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 abbreviated to the minimum number of letters which determines a unique command 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 command following a character For example s lt CR gt returns the current set point and s 150 0 lt CR gt sets the set point to 150 0 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 da
40. perating procedures of the calibrator as de scribed in the instruction manual 3 Specifications and Environmental Conditions Specifications 3 1 3 2 Specifications and Environmental Conditions Specifications Power 115 VAC 10 50 60 Hz 1000 Watts and 230 VAC 10 50 60 Hz switchable Ambient Temperature 5 50 C 41 121 F Operating Range 50 650 C 122 1202 F Resolution 0 1 C or F resolution Readout Switchable C or F Accuracy 0 5 C up to 400 C 1 C 400 C to 650 C 2 C for holes greater than 6 5 mm 0 25 Stability 0 05 C at 100 C 0 12 C at 500 C 0 12 C at 650 C Uniformity 0 1 C below 400 C 0 5 C with similar sized wells above 400 C Controller Hybrid analog digital controller with data retention Heater 1000 W Heating Times 12 minutes from ambient to 650 C Cooling Times 25 minutes from 650 C to 100 C Stabilization Time 7 minutes Immersion Depth 124 mm 4 875 Cooling 2 speed internal fan Fault Protection Sensor burnout and short protection over temperature thermal cutout Test Wells 1 125 dia x 4 87 deep Multi hole inserts are available Size 236 mm H x 109 mm W x 185 mm D 9 3 x 4 3 x 7 3 Weight 3 6 kg 8 Ibs Environmental Conditions Although the instrument has been designed for optimum durability and trou ble free operation it must be handled with care The instr
41. period of 0 The sample period is indicated by SPEr Serial sample period parameter Press SET to choose to set the sample period The current sample period value will be displayed Press EXIT to exit without saving the changes Current sample period seconds Adjust the value with UP or DOWN and then use SET to set the sample rate to the displayed value SP 60 New sample period Duplex Mode The next parameter is the duplex mode The duplex mode may be set to full du plex 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 du plex mode parameter is indicated by dUPL Serial duplex mode parameter Linefeed The final parameter in the serial interface menu is the linefeed mode This pa rameter enables on or disables off transmission of a linefeed character LF 31 9141 Dry well Calibrator User s Guide ASCII 10 after transmission of any carriage return The linefeed parameter is indicated by 32 8 Digital Communication Interface Serial Communications 8 1 8 1 1 8 1 2 Digital Communication Interface The dry well calibrator is capable of communicating with and being controlled by other equipment through the digital serial interface With a digital interface the instrument may be connected
42. rning identifies conditions and actions that may pose hazards to the user e Caution identifies conditions and actions that may damage the instru ment being used 1 2 1 AX WARNINGS To avoid personal injury follow these guidelines GENERAL e DO NOT use this instrument in environments other than those listed in the User s Guide e Inspect the instrument for damage before each use DO NOT use the in strument if it appears damaged or operates abnormally e Follow all safety guidelines listed in the user s manual e Calibration Equipment should only be used by Trained Personnel e If this equipment is used in a manner not specified by the manufacturer the protection provided by the equipment may be impaired e Before initial use or after transport or after storage in humid or semi hu mid environments or anytime the dry well has not been energized for more than 10 days the instrument needs to be energized for a dry out period of 2 hours before it can be assumed to meet all of the safety re quirements of the IEC 1010 1 If the product is wet or has been in a wet environment take necessary measures to remove moisture prior to apply 1 Before You Start Safety Information ing power such as storage in a low humidity temperature chamber operat ing at 50 C for 4 hours or more DO NOT use this instrument for any application other than calibration work The instrument was designed for temperature calibration Any o
43. s set at temperatures less than 50 C Use extreme care when removing hot inserts DO NOT turn off the instrument at temperatures higher than 100 C This could create a hazardous situation Select a set point less than 100 C and allow the instrument to cool before turning it off The high temperatures present in dry wells designed for operation at 300 C and higher may result in fires and severe burns if safety precau tions are not observed ELECTRICAL SHOCK These guidelines must be followed to ensure that the safety mechanisms in this instrument will operate properly This instrument must be plugged 9141 Dry well Calibrator User s Guide into a 115 VAC 60Hz 230 VAC 50Hz optional AC only electric outlet The power cord of the instrument is equipped with a three pronged grounding plug for your protection against electrical shock hazards It must be plugged directly into a properly grounded three prong receptacle The receptacle must be installed in accordance with local codes and ordi nances Consult a qualified electrician DO NOT use an extension cord or adapter plug If supplied with user accessible fuses always replace the fuse with one of the same rating voltage and type Always replace the power cord with an approved cord of the correct rat ing and type HIGH VOLTAGE is used in the operation of this equipment SEVERE INJURY or DEATH may result if personnel fail to observe safety precau tions Before working insid
44. sensor e Ifa hazardous material is spilt on or inside the equipment the user is re sponsible for taking the appropriate decontamination steps as outlined by the national safety council with respect to the material e Ifthe 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 a Hart Scientific Authorized Service Center for more information e Before using any cleaning or decontamination method except those rec ommended by Hart users should check with a Hart Scientific Authorized Service Center to be sure that the proposed method will not damage the equipment e Ifthe 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 haz ards may arise 47 12 Troubleshooting 12 12 1 Troubleshooting This section contains information on troubleshooting CE Comments and a wiring diagram Troubleshooting Problems Possible Causes and Solutions In the event that the instrument appears to function abnormally this section may help to find and solve the problem Several possible problem conditions 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 problem cannot otherwise be solved contact a Hart Scientific Authorized Service Center see S
45. sing the UP and DOWN buttons After the desired value is reached press SET to set the parameter to the new value Pressing EXIT causes the parameter to be skipped ignoring any changes that may have been made Ro 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 accuracy ALPHA This probe parameter refers to the average sensitivity of the probe between 0 and 100 C The value of this parameter is set at the factory for best instrument accuracy DELTA This probe parameter characterizes the curvature of the resistance temperature relationship of the sensor The value of this parameter is set at the factory for best instrument accuracy Operating Parameters The operating parameters menu is indicated by PAr Operating parameters menu Press UP to enter the menu The operating parameters menu contains the HL High Limit parameter The HL parameter adjusts the upper set point tempera 29 9141 Dry well Calibrator User s Guide 30 7 11 7 11 1 ture The factory default and maximum are set to 650 C For safety a user can adjust the HL down so the maximum temperature set point is restricted HL High Limit parameter Pres SET to accept the new temperature limit Serial Interface Parameters The serial RS 232 interface parameters menu is indicated by SErIRL Serial RS 232 interface
46. ta denoted by n may be entered in decimal or exponential notation Characters are shown in lower case although upper case may be used Spaces may be added within command strings and will simply be ignored Backspace BS ASCII 8 may be used to erase the previous character A termi nating CR is implied with all commands 35 9141 Dry well Calibrator User s Guide Table 2 9141 controller communications commands Command Command Returned Acceptable Command Description Format Example Returned Example 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 350 Instrument Range Read temperature t emperature t t 9999 9 C or F t 55 6 C Read temperature units u nits u U X u C Set temperature units u nits c f CorF Set temperature units to Celsius u nits c u C Set temperature units to u nits f u f Fahrenheit Read scan mode sc an SC Sc ON or OFF Sc ON Set scan mode sc an on off sc on ON or OFF Read scan rate sr ate Sr srat 99 9 C or F min srat 12 4 C min Set scan rate sr ate n sr 1 1 1 to 99 9 Read hold holld ho ho open closed 99 9 C ho open 30 5C or F Secondary Menu Read proportional band setting pr opband pr pb 999 9 pb 15 9 Set proportional band to n pr opband n pr 8 83 Depends on Configuration Read heater power po wer po
47. table instrument or bench top temperature calibrator for calibrating thermocouple and RTD temperature probes The 9141 is small enough to use in the field and accurate enough to use in the lab Calibrations may be done over a range of 50 C to 650 C 122 F to 1202 F Temperature display of the 9141 is 0 1 degrees The dry well calibrator features e Rapid heating and cooling e Interchangeable multiple hole probe sleeves e Convenient handle e RS 232 interface e Switchable AC Input 115 VAC or 230 VAC Built in programmable features include e Temperature scan rate control e Temperature switch hold e Eight Setpoint memory e Adjustable readout in C or F The temperature is accurately controlled by Hart s hybrid analog digital con troller 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 tempera ture within the specified range The calibrator s multiple fault protection de vices insure user and instrument safety and protection The 9141 dry well calibrator was designed for portability low cost and ease of operation Through proper use the instrument will provide continued accurate calibration of temperature sensors and devices The user should be familiar with the safety guidelines and o
48. ther use of the instrument may cause unknown hazards to the user Completely unattended operation is not recommended Overhead clearance is required DO NOT place the instrument under a cabinet or other structure Always leave enough clearance to allow for safe and easy insertion and removal of probes Tf 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 haz ards may arise This instrument is intended for indoor use only BURN HAZARDS DO NOT turn the instrument upside down with the inserts in place the inserts will fall out DO NOT operate near flammable materials Use of this instrument at HIGH TEMPERATURES for extended periods of time requires caution DO NOT touch the well access surface of the instrument The block vent may be very hot due to the fan blowing across the heater block of the dry well The temperature of the well access is the same as the actual display tem perature e g if the instrument is set to 375 C and the display reads 375 C the well is at 375 C For top loading dry wells the top sheet metal of the dry well may exhibit extreme temperatures for areas close to the well access The air over the well can reach temperatures greater that 200 C for high temperature 400 C and higher dry wells Note Probes and inserts may be hot and should only be inserted and removed from the instrument when the instrument i
49. ttom of the unit matches the source voltage Improper switch setting Check the 115 VAC 230 VAC switch on the PEM power entry module Make sure this switch is set to the correct type of input voltage Check the 115 VAC 230 VAC heater switch Make sure this switch is set to the cor rect type of input voltage An o is displayed External Switch open The external switch is open causing the displayed tempera at the left of the ture to be frozen and keeping the set point from scanning Turn the Switch Test off display by pressing the DOWN button on the front panel 49 9141 Dry well Calibrator User s Guide 50 12 2 12 2 1 Unstable display Wait Allow the instrument to stabilize for a few minutes Proportional band may be incorrect Refer to the proportional band on the Re port of Calibration Electrical Noise If the unit is being used in the field take it to a different location calibration lab to see if the display becomes stable If the display is stable in the new location there may be electrical noise generated by equipment in the field in terfering with the control The display shows Controller problem The error messages signify the following problems with the an error controller Err 1 a RAM error Er r 2 aNVRAM error 3 a Structure error Ecc 4 an ADC setup error 5 an ADC ready error Er r 6 adefective control sensor sensor is disconnected or shorted Insure that the sensor is connected Err
50. ument should not be operated in an excessively dusty or dirty environment Maintenance and clean ing recommendations can be found in the Maintenance Section of this manual The instrument operates safely under the following conditions e temperature range 5 50 C 41 122 F e ambient relative humidity maximum 80 for temperature lt 31 C de creasing linearly to 50 at 40 C e pressure 75kPa 106kPa e mains voltage within 10 of nominal e vibrations in the calibration environment should be minimized 11 9141 Dry well Calibrator User s Guide 3 3 e altitude does not effect the performance or safety of the unit Warranty Fluke Corporation Hart Scientific Division 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 warranty extends only to the original purchaser and shall not apply to any product which in Hart s sole opinion has been subject to misuse alteration abuse or abnormal conditions of operation or handling Software is warranted to operate in accordance with its programmed instruc tions 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 determined upon examination by Hart to be defective If Hart
51. unction off Press SET to accept the present setting and continue SET Accept scan setting Scan Rate The next function in the main menu is the scan rate The scan rate can be set from 1 to 99 9 C min The maximum scan rate however is actually 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 Press SET to accept the new scan rate and continue SET Accept scan rate 7 Controller Operation Temperature Display Hold 7 4 7 4 1 7 4 2 7 4 3 Temperature Display Hold The 9141 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 1s useful for testing thermal switches and cutouts This section explains the functions available for operating the temperature hold feature An example fol lows showing how to set up and use the hold feature to test a switch Hold Temperature Display The hold feature is enabled by simply pressing the UP button The hold tem perature display shows the hold temperature on the right and the switch status on the left For the status c means the switch is closed and o means the switch is open The status flashes when the switch is
52. width The proportional band width is set at the factory to about 15 0 C The propor tional band width may be altered by the user if he desires to optimize the con trol 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 27 9141 Dry well Calibrator User s Guide 28 7 8 7 9 Press SET and EXIT to enter the secondary menu and show the heater power Then press SET to access the proportional band ser EXT Access heater power in secondary menu SEL i Flashes SEC for secondary menu and then displays the heater power Heater power in percent To accept the new setting press SET Press EXIT to continue without stor ing the new value SET Accept the new proportional band setting Controller Configuration The controller has a number of configuration and operating options and calibra tion parameters which are programmable via the front panel These are ac cessed from the secondary menu after the proportional band function by pressing SET Pressing SET again enters the first of three sets of configu ration parameters calibration parameters operating parameters and serial in terface parameters The sets are selected using the UP and DO
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