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9122A Users Guide.vp

1. 43 8 1 2 Setup 43 8 1 2 1 Baud Rate 44 8 1 2 2 Sample Period 44 8 1 2 3 Duplex Mode 44 8 1 2 4 Linefeed 44 8 1 3 Serial Operation 45 8 2 IEEE 488 Communication 45 8 2 1 Setup 45 8 2 1 1 IEEE 488 Interface Address 45 8 2 2 IEEE 488 Operation 45 8 3 Interface Commands 46 9 Test Probe Calibration 51 9 1 Calibrating a Single probe
2. 19 6 2 Switch to 230 V Operation 19 6 3 Setting the Temperature 19 6 4 Calibrating Probes 20 7 Controller Operation 21 i 7 1 Well Temperature 21 7 2 Reset Cut out 21 7 3 Temperature Set point 23 7 3 1 Programmable Set points 23 7 3 2 Set point Value 24 7 4 Adjust Units 24 7 5 Scan 25 7 5 1 Scan Control 25 7 5 2 Scan Rate
3. 51 9 2 Comparison Calibration 51 9 3 Fully Loading the Calibrator 52 9 4 Dry well Characteristics 52 9 4 1 Temperature Gradients 52 9 4 2 Heating and Cooling Rates 53 9 4 3 Stabilization and Accuracy 54 10 Calibration Procedure 57 10 1 Calibration Points 57 10 2 Measuring the Set point Error 57 10 3 Computing R0 and ALPHA 58 10 4 Calibration Example 58 11 Maintenance 61 12 Troubleshooting 63 12 1 Troubleshooting
4. 28 Figure 7 Well temperature fluctuation at various proportional band settings 33 Figure 8 Serial Cable Wiring Diagram 43 Figure 9 Hole to Hole Temperature Deviation 52 Figure 10 Hole to Hole Temperature Deviation as a Function of Temperature 53 Figure 11 Typical Cooling Rates 54 Figure 12 Heating Rate 54 Figure 13 Useable Calibration Range Prior to Stabilization 55 Figure 14 Calibration Example 59 Figure 15 Using clamp on ferrites 65 Figure 16 Wiring Diagram 66 v Tables Table1 International Electrical Symbols 1 Table 2 Interface Commands 47 Table 2 Interface Commands Continued
5. 32 7 8 1 Heater Power 32 7 8 2 Proportional Band 32 7 8 3 Cut out 34 7 9 Controller Configuration 35 7 9 1 Probe Parameters 35 7 9 1 1 R0 35 7 9 1 2 ALPHA 35 7 9 1 3 DELTA 36 7 9 2 Operating Parameters 36 7 9 2 1 Temperature Scale Units 7 9 2 2 Cut out Reset Mode 36 7 9 2 3 Approach 37 7 9 2 4 Soak Stability 37 7 9 3 Serial Interface
6. 63 12 2 Comments 64 12 2 1 EMC Directive 64 12 2 1 1 Immunity Testing 64 12 2 1 2 Emission Testing 65 12 2 2 Using Clamp On Ferrites 65 12 2 3 Low Voltage Directive Safety 65 12 3 Wiring Diagram 66 iii iv Figures Figure 1 Top View of 9122A 9 Figure 2 Back Panel 15 Figure 3 Front Panel 16 Figure 4 Constant Temperature Block Assembly 17 Figure 5 Controller Function Flowchart 22 Figure 6 Switch Test Data
7. 1 0 00385 300 0 0 057 1 0 00385 150 0 0186 300 0 150 0 1 0 00385 0 0038544 Figure 14 Calibration Example 11 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 instrument should require very little maintenance Avoid operating the instrument in an oily wet dirty or dusty environment It is 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 Use the wire brush and cleaning kit provided with the instrument Ensure that any material re moved from the well by the wire brush is either blown from the well with forced air or removed with a soft cloth or mop provided This instrument operates at extremely high temperatures and the sleeves can become covered with oxide If the buildup becomes too thick it could cause the sleeves to become jammed in the wells Avoid this build up by buffing the sleeves clean with a Scotch Brite pad or emery cloth after each use DO NOT leave the sleeves in the instrument for prolonged peri ods without removing them and buffing them clean If the outside of the instrument becomes soiled it may be wiped clean with a damp cloth and mild detergent Do not use harsh
8. 48 Table 2 Interface Commands Continued 49 1 Before You Start 1 1 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 Symbol Description AC Alternating Current AC DC Battery 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 On 9122A 1 1 Before You Start Table1 International Electrical Symbols Symbol Description Canadian Standards Association Australian EMC Mark OVERVOLTAGE Installation CATEGORY II Pollution Degree 2 per IEC1010 1 refers to the level of Impulse Withstand Voltage protection provided Equipment of OVERVOLTAGE CATE GORY II is energy consuming equipment to be supplied from the fixed installation Examples include household office and laboratory appliances 1 2 Safety Information Use this instrument only as specified in this manual Otherwise the protection provided by the instrument may be impaired Refer to the safety information in the Warnings and Cautions sections below The following definitions apply to the terms Warning and Caution Warning identifies conditions and actions that may pose hazards to the user Caution identifies condition
9. 25 7 6 Display Hold 26 7 6 1 Hold Temperature Display 26 7 6 2 Mode Setting 26 7 6 3 Scan Hold 27 7 6 4 Switch Wiring 28 7 6 5 Switch Test Example 28 7 7 Ramp and Soak Program Menu 29 7 7 1 Number of Program Set points 29 7 7 2 Set points 30 7 7 3 Program Soak Time 30 7 7 4 Program Function Mode 31 7 7 5 Program Control 31 7 8 Secondary Menu
10. 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 Celsius or Fahrenheit The functions of the buttons are as follows SET Used to display the next parameter in the menu and to set parameters to the displayed value DOWN Used to decrement the displayed value of parameters UP Used to increment the displayed value 16 Hart Scientific 5 Parts and Controls SET DOWN UP EXIT 9122A A Fluke Company 348 00C Figure 3 Front Panel EXIT Used to exit from a menu When EXIT is pressed any changes made to the displayed value will be ignored if you have not pressed the SET button first Control Indicator The Control Indicator is a two color light emitting diode This indicator lets the user visually see the ratio of heating to cooling When the indicator is red the heater is on and when it is green the heater is off 5 3 Constant Temperature Block Assembly See Figure 4 below 5 3 1 Constant Temperature Block The Block is made of aluminum bronze and provides a relatively constant and accurate temperature environment in which the sensors tha
11. brated to an accuracy of better than 0 5 C over a range of 600 degrees 10 1 Calibration Points In calibrating the dry well R0 and ALPHA are adjusted to minimize the set point error at each of two different dry well temperatures Any two reason ably 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 calibra tion temperatures the larger the calibrated temperature range will be but the calibration error will also be greater over that range If for instance 150 C and 500 C are chosen as the calibration 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 allow 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 10 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 temperature Check the stability with the thermometer When both the well and the thermometer have stabilized measure the temperature with the thermometer and comput
12. 46 Hart Scientific 8 Digital Communication Interface 9122A 47 8 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 10 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 sample and hold sh old sh shold ON or OFF shold ON Set sample and hold sh old on of f sh Set sample and hold on sh old on sh on Set sample and hold offf sh old off sh off Read temperature t emperature t t 9999 99 C or F t 55 69 C Read hold status ho ld ho hold closed or open 9999 99 C or F ho open 75 0 C Secon
13. 7 9 1 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 accuracy 7 9 1 2 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 9122A 35 7 Controller Operation 7 9 1 3 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 7 9 2 Operating Parameters The operating parameters menu is indicated by PAr Operating parameters menu Press SET to enter the menu The operating parameters menu contains the units scale setting cut out reset mode setting approach setting and soak stabil ity setting 7 9 2 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 displaying the well temperature set point proportional band and cut out set point UnitS The temperature scale units selection is the first function in the operating parameters menu Press SET to view the current setting Un C Scale units currently set Press UP or DOWN to change the units Un F New units selected Press SET to accept the new selection and
14. Quick Start 13 4 1 Unpacking 13 4 2 Set up 13 4 3 Power 14 4 4 Setting the Temperature 14 4 5 Changing Display Units 14 5 Parts and Controls 15 5 1 Back Panel 15 5 2 Front Panel 16 5 3 Constant Temperature Block Assembly 17 5 3 1 Constant Temperature Block 17 5 3 2 Probe Sleeves and Tongs 18 5 3 3 Well and Sleeve Cleaning Kit Model 2037 18 6 General Operation 19 6 1 Calibrator Set Up
15. Parameters 38 7 9 3 1 Baud Rate 38 7 9 3 2 Sample Period 38 7 9 3 3 Duplex Mode 39 7 9 3 4 Linefeed 39 7 9 4 IEEE 488 Parameters 40 7 9 4 1 IEEE 488 Address 40 7 9 4 2 Termination 40 7 9 5 Calibration Parameters 41 7 9 5 1 CTO 41 7 9 5 2 SCO 41 8 Digital Communication Interface 43 ii 8 1 Serial Communications 43 8 1 1 Wiring
16. after set tling before proceeding to the next set point The duration is counted from the time the temperature settles to within a specified stability The stability require ment can be set in the parameter menu as explained in Section 7 9 2 4 The de fault is 0 1 C Pt 15 Soak time in minutes 30 Hart Scientific 7 Controller Operation Use the UP or DOWN buttons to change the time Pt 5 New soak time Press SET to continue S Save new setting 7 7 4 Program Function Mode The next parameter is the program function or cycle mode There are four pos sible 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 indefinitely The table be low shows the action of each of the four program mode settings Function Action 1 up stop 2 up down stop 3 up repeat 4 up down repeat Pf 1 Program mode Use the UP or DOWN buttons to change the mode Pf 4 New mode Press SET to continue S Save new setting 7 7 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
17. and 11 show typical heating cooling rates of the 9122A dry well calibrator You will note that the cooling is relatively slow compared to heating It is rec ommended that temperature calibration sequences go from cooler to hotter tem peratures to take advantage of this fact 9122A 53 9 Test Probe Calibration 1 C 2 C 3 C 4 C 5 C 600 500 400 300 200 100 0 Block Temperature C Max to Min Error Figure 10 Hole to Hole Temperature Deviation as a Function of Temperature 9 4 3 Stabilization and Accuracy The stabilization time of the dry well calibrator will depend on the conditions and temperatures involved Typically the displayed well temperature should be 54 Hart Scientific 9 Test Probe Calibration 25 75 125 175 225 275 325 375 425 475 525 575 625 675 725 80 140 200 260 320 380 440 500 Time in Minutes Block Temperature C Figure 11 Typical Cooling Rates 0 50 100 150 200 250 300 350 400 450 500 550 600 650 700 750 0 10 20 30 40 50 60 70 Time in Minutes Block Temperature C Figure 12 Heating Rate within 0 5 degree of the set point within 15 minutes after reaching the set point and within 0 1 degree of its final point of stability within 30 minutes Figure 13 shows the usable calibration range prior to stabilization Plots for specific range of interest can be used to allow calibration within a par
18. change the status Pr StArt Start cycle from beginning 9122A 31 7 Controller Operation Press SET to activate the new program control command and return to the temperature display S Activate new command 7 8 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 7 8 1 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 This value may be estimated by watching the red green control indicator light or read di rectly 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 down or controlling at a constant temperature Monitoring the percent heater power will let the user know how stable the well temperature is With good control stability the per cent 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 00 C Well temperature S E
19. 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 will be immediately echoed or transmitted back to the device of origin 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 8 1 2 4 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 44 Hart Scientific 8 Digital Communication Interface 8 1 3 Serial Operation Once the cable has been attached and the interface set up properly the control ler will immediately begin transmitting temperature readings at the pro grammed 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 8 3 All commands are ASCII character strings terminated with a carriage return character CR ASCII 13 8 2 IEEE 488 Communicati
20. is accessed by pressing SET and then UP 100 00 C Well temperature S U Access program menu ProG Program menu Press SET to enter the program menu S Enter program menu 7 7 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 program 9122A 29 7 Controller Operation 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 7 7 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 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 7 7 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 maintained
21. may be altered by the user if he desires to opti mize 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 menu and show the heater power Then press SET to access the proportional band S E Access heater power in secondary menu 12 Pct Heater power in percent S Access proportional band Pb 4 71C Proportional band setting To change the proportional band press UP or DOWN 9122A 33 7 Controller Operation Proportional Band too Narrow Proportional Band too Wide Optimum Proportional Band Figure 7 Well temperature fluctuation at various proportional band settings Pb 10 00C New proportional band setting To accept the new setting and access the cut out set point press SET Pressing EXIT will exit the secondary menu ignoring any changes just made to the proportional band value S Accept the new proportional band setting 7 8 3 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 exceeds a set value This protects the instrument and p
22. move to the next parameter Press EXIT to ignore the new selection and move to the next parameter 7 9 2 2 Cut out Reset Mode The cut out reset mode determines whether the cut out must be manually reset by the operator or resets automatically when the well temperature drops to a safe value 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 manual mode 36 Hart Scientific 7 Controller Operation Cto rSt Cut out set for manual reset default To change to manual reset mode press UP and then SET Cto Auto Cut out set for automatic reset Warning For compliance with IEC 1010 1 it is recommended that the cutout mode always be set to the manual mode requiring user intervention to reset the instrument 7 9 2 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 for the temperature to settle to a new set point Appr Approach parameter Press SET to access the parameter setting App 12 Current approach value setting Press UP or DOWN to increment decrement the value APP 3 New value setting Press SET to accept the new setting and move to the next parameter Press EXIT to ignore the new setting and move to the next parameter 7 9 2 4 Soak Stabil
23. of the baud rate setting 8 1 1 Wiring The serial communications cable atta ches to the calibrator through the DB 9 connector at the back of the in strument Figure 8 shows the pin out of this connector and suggested cable wiring In order to elimnate noise the serial cable should be shielded with a low resistance between the connector DB 9 and the shield 8 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 pro grammed within the serial interface menu The serial interface parameters menu is outlined in Figure 5 To enter the serial parameter program ming mode first press EXIT while pressing SET and release to enter 9122A 43 8 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 DCD 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 7 RTS 8 CTS 9 NC Instrument Connector DB 9 Pin Computer DTE Connector DB 9 Pin Figure 8 Serial Cable Wiring Diagram the secondary menu Press SET repeatedly until the display reads ProbE This is the menu selection Press UP repeatedly until the serial interface menu
24. to C To change the display units between C and F access the units display from the temperature display by pressing SET 3 times Un C Current temperature units Press UP or DOWN to change the units setting Un F New unit selection Press SET to accept the new selection or press EXIT to ignore the new se lection and return to displaying temperature 24 Hart Scientific 7 Controller Operation 7 5 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 7 5 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 7 5 2 Scan Rate The next function in the main menu is the scan rate The scan rate can be set from 0 1 to 10 0 C min The maximum scan rate however is actually limited by the natural heating or cooling rate of the instrument This scan rate is often less than 10 0 C min especially when cooling The scan rate function appears in the main menu after the scan control function The scan rate uni
25. 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 address to the displayed value Add 15 New IEEE 488 interface address 7 9 4 2 Termination The transmission termination character can be set to carriage return only line feed only or carriage return and linefeed Regardless of the option selected the instrument will interpret either a carriage return or linefeed as a command ter mination 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 40 Hart Scientific 7 Controller Operation Use SET to save the new selection 7 9 5 Calibration Parameters The user has access to the calibration constant CTO This value is set at the fac tory and must not be altered The correct value is important to the proper and safe operation of the calibrator Access to this parameters is available to the user so that in the event the controller s memory fails the user may restore the value to the factory setting Caution DO NOT change the value of the calibration constant from the factory set value The correct setting of this parameter is important to the safety and proper operation of the calibrator The calibrat
26. 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 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 Authorized Service Center see Section 1 3 on page 6 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 MECHANTABILITY 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 12 Hart Scientific 3 Specifications and Environmental Conditions 4 Quick Start 4 1 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 9122A Dry well 2154 2156 2157 and 2159 Inserts 1 8 3 16 1 4
27. 0 Time Deg C Maximum Minimum Figure 6 Switch Test Data 4 Set the hold mode to automatic see Section 7 6 2 5 Set the scan hold to ON see Section 7 6 3 6 Set the number of program set points to 2 in the program menu see Section 7 7 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 7 7 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 7 7 3 10 Set the program function to mode 4 so that the instrument will cycle be tween the 2 set points repeatedly see Section 7 7 4 11 Start the program see Section 7 7 5 12 Collect data on a computer connected to the RS 232 port Refer to Section 8 for instructions on configuring the RS 232 communications interface The data may appear as shown in Figure 6 The maximum and minimum are the switch temperatures 7 7 Ramp and Soak Program Menu The ramp and soak program feature of the 9122A allows the user to program 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 se lect one of four different cycle functions A flowchart of the ramp and soak program menu is shown in Figure 5 The program parameter menu
28. 9122A Dry Well Calibrator User s Guide Revision 291901 Revision 291001 Copyright 2002 All rights reserved Hart Scientific Inc 799 E Utah Valley Drive American Fork Utah 84003 9775 Telephone 801 763 1600 Fax 801 763 1010 Internet 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 2 1 Warnings 2 1 2 2 Cautions 4 1 3 Hart Scientific Authorized Service Centers 6 2 Introduction 9 3 Specifications and Environmental Conditions 11 3 1 Specifications 11 3 2 Environmental Conditions 11 3 3 Warranty 12 4
29. 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 propor tional band setting function press SET 7 8 2 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 constant level 32 Hart Scientific 7 Controller Operation 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 tempera ture will deviate excessively from the set point due to varying external condi tions 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 controller overreacts to temperature variations For best control stability the proportional band must be set for the optimum width The proportional band width
30. al 10 Hart Scientific 2 Introduction 3 Specifications and Environmental Conditions 3 1 Specifications Range 50 C 700 C 95 F 1712 F Accuracy center well 0 10 C 300 C 0 30 C at 660 C Stability 0 01 C at 100 C 0 02 C at 300 C 0 05 C at 660 C Well to Well Uniformity All Wells 0 05 C at 100 C 0 12 C at 300 C 0 45 C at 660 C Drilled Wells 0 025 C at 100 C 0 1 C at 300 C 0 3 C at 660 C Test Wells 9 wells 4 3 4 dia x 6 deep for interchangeable inserts and 5 1 4 dia x 6 deep wells Computer Interface RS 232 interface included with 9930 Interface it for Windows control software IEEE 488 optional Heating Time to Max 75 minutes typical Resolution 0 01 C or F resolution Display LED C or F user selectable Size 13 5 H x 8 W x 12 D 343 x 203 x 305 mm Weight 25 lb 11 3 kg Power 115 VAC 10 50 60 Hz 1 000 Watts 230 VAC 10 50 60 Hz 1 000 Watts AmbientTemperature 5 50 C 40 120 F Controller Hybrid analog digital controller with data retention Fault Protection Sensor burnout protection over temperature thermal cut out electrical fuses Fuse Rating 115 V 10 A F fast acting 250 V 230V 5 A F fast acting 250 V Safety Conforms to EN61010 1 Conforms to CAN CSA C22 2 No 1010 1 UL3111 and ANSI ISA S82 01 Stability is two times the standard deviation Heating and cooling t
31. and 3 8 Bronze Aluminum Power Cord User s Guide Tongs insert removal tool Well and sleeve cleaning kit Model 2037 9930 Interface it Software and User s Guide 4 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 the unit under any structure Plug the power cord into a grounded mains outlet Observe that the nominal voltage corresponds to that indicated on the back of the calibrator Carefully insert the probe sleeve into the well Probe sleeves should be of the smallest hole diameter possible still allowing the probe to slide in and out eas ily Sleeves of various 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 power switch on The fan should begin quietly blowing air through the instrument and the controller dis play 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 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 After using the calibrator allow the well to cool by setti
32. ating 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 the test probe readout may be compared to the displayed temperature of the cali brator The display temperature should be stable to within 0 01 C degree for best results Caution never allow foreign material into the probe holes of the block or insert Fluids and other materials can damage the instrument causing binding and damage to your probe 9 2 Comparison Calibration Improved performance can be achieved through characterization of the equip ment and the calibration technique to be performed and using a high accuracy reference thermometer for making comparison measurements For best results use similar probes for making these measurements For example two 0 25 inch diameter probes could be calibrated in the following manner Select two similar type holes either 0 25 diameter sleeved holes or the fixed holes in the equilibra tion block Carefully measure the temperature
33. ator is supplied with a cleaning kit for removing oxidation or foreign material from the inserts and calibrator wells Oxidation will grow on the metal block and inserts over time and can cause the inserts to stick in the wells or cause probes to stick in the inserts Hart recommends using the cleaning kit regularly to remove any excess oxidation See instructions provided inside the kit 18 Hart Scientific 5 Parts and Controls 6 General Operation 6 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 for eign objects dirt and grit before the sleeve is inserted The sleeve is inserted with the two small tong holes positioned upward The probe sleeve should be of the smallest hole size possible while allowing the probe to slide in and out eas ily allowing for thermal expansion 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 in strument 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 reache
34. chemicals on the surface which may damage the paint The dry well calibrator should be handled with care Avoid knocking or dropping the calibrator If a 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 Do not drop the probe stems into the well This type of action can cause a shock to the sensor If a 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 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 contact a Hart Scientific Authorized Service Center for more information 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 9122A 61 11 Maintenance 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 haz ards 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 select
35. d Description Command Format Command Example Returned Returned Example Acceptable Values Set serial linefeed mode lf eed on of f ON or OFF Set serial linefeed mode to on lf eed on lf on Set serial linefeed mode to off lf eed of f lf of Read Temperature units u nits u u x u C Calibration Menu These commands are only used for factory testing Read software cut out mode sco sco sco ON or OFF sco ON Set software cut out mode sco ON OF F ON or OFF Set software cut out mode on sco ON sco on Set software cut out mode off sco OF F sco off Read setpoint resistance sr sr 999 999 ohm 110 222 ohm Miscellaneous not on menus Read firmware version number ver sion ver ver 9999 9 99 ver 9122 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 Interface Commands Continued 9 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 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 or less before switching the power off 9 1 Calibr
36. dary Menu 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 cut out setting c utout c c 9999 C or F c 620 C Set cut out setting c utout n r eset Set cut out to n degrees c utout n c 500 Temperature Range Reset cut out 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 2 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 Table 2 Interface Commands 48 Hart Scientific 8 Digital Communication Interface Command Description Command Format Command Example Returned Returned Example Acceptable Values 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 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 calibration param
37. ded 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 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 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 700 C and the display reads 700 C the well is at 700 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 is set at temperatures less than 50 C Use e
38. description of the problem 9122A 7 1 Before You Start 2 Introduction The Hart Scientific 9122A Dry Well Figure 1 Calibrator may be used as a portable instrument or bench top temperature calibrator for calibration of multi ple thermocouple and RTD temperature probes The dry well calibrator features four interchangeable aluminum bronze probe sleeves with four 1 4 inch diameter fixed wells The temperature is accurately controlled by Hart s hybrid analog digital controller with a serial port and op tionally an IEEE 488 port 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 eas ily set with the control buttons to any desired temperature within the specified range The calibrator s multiple fault protection devices insure user and instru ment safety and protection 9122A 9 2 Introduction SET DOWN UP EXIT 9122A A Fluke Company 348 00C WARNING THIS AREA IS HOT Figure 1 Top View of 9122A The 9122A 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 fa miliar with the safety guidelines and operating procedures of the calibrator as described in the instruction manu
39. e the temperature er ror errL which is the actual well temperature minus the set point temperature If for example the calibrator is set for 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 measure 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 9122A 57 10 Calibration Procedure 10 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 serial 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 calibration 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 1 0 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 t
40. ected 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 temperature to be frozen and keeping the set point from scanning Turn the Switch Test off by pressing the DOWN button on the front panel Error code is displayed Initialize the system by performing the Master Reset Sequence If the unit repeats the error code contact Hart Scientific Customer Support for a return authorization 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 Display flashes 273 C or 459 F The sensor is disconnected or shorted Please contact a Hart Scientific Authorized Service Center for further instructions 9122A 63 12 Troubleshooting Problem Possible Causes and Solutions Unstable display Wait Allow the instrument to stabilize for a few minutes Proportional band may be incorrect Refer to the pro
41. ed cut out fol low the controller directions Section 7 2 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 temperature is decreasing 62 Hart Scientific 11 Maintenance 12 Troubleshooting This section contains information on troubleshooting CE comments and a wir ing diagram In the event that the dry well appears to function abnormally this section may help to find and solve the problem Several possible problem conditions are de scribed 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 otherwise be solved contact a Hart Scientific Authorized Service Center see Section 1 3 for assistance Be sure to have the instrument model number serial number and voltage available 12 1 Troubleshooting Problem Possible Causes and Solutions Incorrect temperature reading Power the unit on and watch the display If the first number displayed is less than 0005 the unit has been re initialized The unit needs to be re programmed for R0 ALPHA and DELTA These numbers can be found on the Report of Calibra tion that was shipped with the unit The display is off Check the fuses Check that the power cord is plugged in and conn
42. ed through the switch Therefore we advise that a ferrite be attached as indicated 12 2 3 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 9122A 65 12 Troubleshooting DISPLAY HOLD clamp on ferrite switch wiring Figure 15 Using clamp on ferrites 12 3 Wiring Diagram 66 Hart Scientific 12 Troubleshooting A B C D D C B A 4 3 2 1 1 2 3 4 TITLE DWG NO SIZE REV SHEET SCALE CAGE CODE C 799 East Utah Valley Drive American Fork Utah 84003 801 763 1600 9122 A WIRING HSG263 2 Wire shall be stripped to terminal manufacturer s specifications Notes LTR BY APPROVAL DATE REVISIONS ST SM 8 9 2002 DESCRIPTION Changed CAD format and cleaned up for initial release Steve Martin 9 16 02 3 Wire shall be 18 AWG unless otherwise specified A Figure 16 Wiring Diagram
43. eration of this equipment SEVERE INJURY or DEATH may result if personnel fail to observe safety precau tions Before working inside the equipment turn power off and discon nect power cord 1 2 2 Cautions DO NOT leave the sleeve s in the instrument for prolonged periods Due to the high operating temperatures of the instrument the sleeves should be removed after each use and buffed with a Scotch Brite pad or emery cloth See Maintenance Section 11 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 Overhead clearance is required DO NOT place unit under any structure 4 Hart Scientific 1 Before You Start Component lifetime can be shortened by continuous high temperature operation DO NOT apply any type of voltage to the display hold terminals Ap plying 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 safety and proper operation of the calibrator DO NOT
44. ernally the black termi nal connects to ground The red terminal connects to 5V through a 10 k re sistor The calibrator measures the voltage at the red terminal and interprets 5V as open and 0V as closed 7 6 5 Switch Test Example This section describes a possible application for the display 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 display hold feature and the ramp and soak fea ture described in detail in the next section to test the switch Measurements can be made by observing the display or preferably by collecting data using a printer or computer connected to the RS 232 port To set up the test do the fol lowing steps 1 Connect the switch wires to the terminals on the back 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 5 1 3 Set the scan rate to a low value say 1 0 C min see Section 7 5 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 28 Hart Scientific 7 Controller Operation 90 85 80 75 70 65 60 55 50 45 4
45. et point and 20 to 30 minutes to stabilize to within 0 1 C Ultimate stability may take an hour or more of stabilization time 4 5 Changing Display Units The 9122A 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 1 While displaying temperature press SET 3 times 2 Press the UP or DOWN buttons to change the units 3 Press the SET button to store the change 4 Press EXIT to return to displaying temperature 14 Hart Scientific 4 Quick Start 5 Parts and Controls The user should become familiar with the dry well calibrator and its parts 5 1 Back Panel Refer to Figure 2 on page 15 Power Cord At the rear of the cali brator is the removable power cord in let that plugs into an IEC grounded socket Fuses The unit is equipped with the appropriate fuse for the voltage Refer to Section 3 1 Specifications on page 11 for details 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 switch allow the unit to be field switched for 115 VAC or 230 VAC operation see Section 3 1 Specifications for power details See Section 6 2 for instructions on chang ing the input vo
46. eter r 0 r r0 999 999 r0 100 578 Set R0 calibration parameter to n r 0 n r 100 324 95 0 to 105 0 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 00320 to 00420 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 1 0 to 1 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 cut out mode cm ode cm m xxxx cm auto Set cut out mode cm ode r eset a uto RESET or AUTO Set cut out to be reset manually cm ode r eset cm r Set cut out 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 C 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 C 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 Interface Commands Continued 9122A 49 8 Digital Communication Interface Comman
47. functions All commands are ASCII charac ter strings and are terminated with a carriage return CR ASCII 13 Interface commands are listed below 9122A 45 8 Digital Communication Interface 8 3 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 both the RS 232 serial interface and the IEEE 488 GPIB interface In either case the commands are terminated with a carriage return character The inter face 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 will return the current set point and s 150 00 lt CR gt will set 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 decimal or exponential notation Spaces may be added within command strings and will simply be ig nored Backspace BS ASCII 8 may be used to erase the previous character A terminating CR is implied with all commands
48. he data for tL tH errL and errH were as given above then the new values R0 and ALPHA would be computed as 100 193 and 0 0038272 respectively Program the new values R0 and ALPHA into the controller Check the calibration by setting the temperature to tL and tH and measuring the errors again If desired the calibration procedure may be re peated to further improve the accuracy 10 4 Calibration Example The calibrator is to be used between 125 and 325 C and it is desired to cali brate 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 14 58 Hart Scientific 10 Calibration Procedure for applying equations to the example data and computing the new probe con stants 9122A 59 10 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 0186 150 0 0 057 300 0 300 0 150 0 0 0038 5 1 100 000 99 972 Compute ALPHA ALPHA
49. imes may be affected by line voltage and ambient temperatures 3 2 Environmental Conditions Although the instrument has been designed for optimum durability and trou ble free operation it must be handled with care The instrument 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 temperature range 5 C to 50 C 41 C to 122 F 9122A 11 3 Specifications and Environmental Conditions ambient relative humidity maximum 80 for temperatures lt 31 C de creasing linearly to 50 at 40 C pressure 75kPa 106kPa mains voltage within 10 of nominal vibrations in the calibration environment should be minimized altitude less than 2000 meters indoor use only 3 3 Warranty Hart Scientific Inc Hart warrants this product to be free from defects in ma terial 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
50. in both wells allowing adequate stabilization time between measurements After noting the difference between them position both the reference thermometer and the test probe in the same two wells and again allow adequate settling time The appropriate corrections are then made to represent the differences between the two wells In this way calibration can be made within hundredths of a degree Note that a hot probe moved quickly from one hole to the other will take only about 5 minutes to reach a fully settled temperature 9122A 51 9 Test Probe Calibration 9 3 Fully Loading the Calibrator The 9122A temperature calibrator features multiple thermometer test sensor 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 tempera ture at the test sensor locations to a temperature below that indicated on the cal ibrator display The amount of the discrepancy will depend on the size and number of probes to be tested as well as the magnitude of the temperature dif ference to ambient Recovery time due to insertion of several probes into the calibrator will also increase If a series of temperatures points are to be mea sured with the same test probes it will be faster to leave them in the calibrator as the temperature changes are made Caution Never introduce any foreign
51. ion parameters menu is indicated by CAL Calibration parameters menu Press SET five times to enter the menu 7 9 5 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 potentiometer For the 9122A dry well calibrator this parameter should read between 710 and 750 7 9 5 2 SCO This parameter is used at the factory for testing purposes and should not be al tered by the user 9122A 41 7 Controller Operation 8 Digital Communication Interface The dry well calibrator is capable of communicating with and being controlled by other equipment through the digital interface Two types of digital interface are available the RS 232 serial interface which is standard 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 Communications commands are summarized in Table 2 on page 47 8 1 Serial Communications The calibrator is equipped with an RS 232 serial interface that allows serial digital communications over fairly long distances With the serial interface the user may access any of the functions parameters and settings discussed in Sec tion 7 Controller Operation with the exception
52. is indicated with SErIAL Finally press SET to enter the serial pa rameter menu In the serial interface parameters menu are the BAUD rate the sample rate the duplex mode and the linefeed parameter 8 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 choose to set the baud rate The current baud rate value will then be displayed The baud rate of the 9122A serial communications may be programmed to 300 600 1200 or 2400 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 8 1 2 2 Sample Period The sample period is the next parameter in the menu and prompted with SAnPLE The sample period is the time period in seconds between tempera ture 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 period Adjust the period with UP or DOWN and then use SET to set the sample rate to the displayed value 8 1 2 3 Duplex Mode The next parameter is the
53. 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 7 6 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 display freezes when the switch closes Whenever the switch is in the normal 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 example if the switch is currently open when the set point is changed the closed position 26 Hart Scientific 7 Controller Operation then becomes the new active position The normal position will be set automati cally under any of the following conditions 1 a new set point number is se lected 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 se
54. ity The soak stability controls the required stability of the well temperature for the soak time see Section 7 7 3 The stability is in degrees Celsius The default is 0 5 C This value can be changed in the parameter menu StAb Soak stability parameter Press SET to access the stability adjustment parameter 4 98 Current soak stability parameter value Press UP or DOWN to adjust the value 3 00 New value setting 9122A 37 7 Controller Operation Press SET to accept the new value setting and return to the top of the Operat ing Parameters Menu Press EXIT to discard the new setting and return to the top of the menu 7 9 3 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 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 7 9 3 1 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 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 The ba
55. lded RS 232 cables 12 2 1 1 Immunity Testing The instrument was tested to the requirements for laboratory locations Crite rion B was used for Radiated RF IEC 61000 4 3 Therefore the operation of the instrument may be affected by excessive electromagnetic interference and the instrument may not perform within the normal specification limits in such an environment Criterion C was used for Electrostatic Discharge ESD IEC 61000 4 2 If the instrument is subjected to ESD conditions the instrument may require the user to cycle the power to return to normal operation 64 Hart Scientific 12 Troubleshooting 12 2 1 2 Emission Testing The instrument fulfills the limit requirements for Class A equipment but does not fulfill the limit requirements for Class B equipment The instrument was not designed to be used in domestic establishments 12 2 2 Using Clamp On Ferrites When using the Display Hold feature See Section 7 6 Display Hold we ad vise that you place a clamp on ferrite around the wires of the thermal switch as indicated in Figure 15 on page 65 The instrument was tested in accordance with IEC 61326 1 1998 which indicates in Section 4 of the IEC Standard that the manufacturer shall provide pertinent information if the emissions exceed re quired limits of the standard when the instrument is connected to a test object When a thermal switch is attached to the instrument the emission limits of the standard may be exceed
56. ltage Heater Voltage Switch The heater voltage switch can be switched be tween 115 VAC and 230 VAC This switch setting must match the PEM set ting See Section6 2 for instructions 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 9122A 15 5 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 IEEE 488 Port optional This connector is for interfacing the calibrator to an IEEE GPIB bus for control and communications Display Hold The two terminals may be used to test a switch or cut out with the calibrator Fan The fan inside the calibrator runs continuously when the unit is being op erated to provide cooling for the instrument Slots at the top and around the four corners of the calibrator are provided for airflow The area around the cali brator must be kept clear to allow adequate ventilation 5 2 Front Panel See Figure 3 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 dis plays various calibrator functions settings and constants The display shows temperatures in units according to the selected scale
57. material into the probe hole of the insert Fluids etc can leak into the calibrator causing damage to the cali brator or binding and damage to your probe 9 4 Dry well Characteristics 9 4 1 Temperature Gradients A dry well type calibrator will have temperature gradients between holes limit ing the accuracy of the measurement These gradients are created by variations 52 Hart Scientific 9 Test Probe Calibration 200 2 200 1 200 0 Temperature C Individual Wells Figure 9 Hole to Hole Temperature Deviation in heat losses and their temperature effect on the block as they are propagated back to the heat source Figure 9 charts a typical gradient condition as mea sured with the same thermometer fully immersed and moved from well to well This condition will vary somewhat from unit to unit and from temperature to temperature Figure 10 shows the increase in gradient error as the block tem perature is increased There is a vertical gradient in the well The heating device 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 the number and de sign of the thermometer probes inserted into the calibrator The effect of the various heat loss created gradients can be minimized by mak ing measurements between similar probes as they will create similar heat loss patterns 9 4 2 Heating and Cooling Rates Figures 12
58. me stuck in the well Most probes have handle temperature limits Be sure that the probe handle temperature limit is not exceeded in the air above the instrument If the probe handle limits are exceeded the probe may be permanently damaged 9122A 5 1 Before You Start 1 3 Hart Scientific Authorized Service Centers Please contact one of the following authorized Service Centers to coordinate service on your Hart product Hart Scientific Inc 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 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 6 Hart Scientific 1 Before You Start Service Center 83 Clemenceau Avenue 15 15 06 Ue Square 239920 SINGAPORE Phone 65 737 2922 Telefax 65 737 5155 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
59. ng The displayed well temperature will gradually change until it reaches the set point temperature The well may require 5 to 75 minutes to reach the set point depending on the span Another 5 to 10 minutes is required for the temperature to stabilize 6 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 calibrator 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 displayed temperature For greater accuracy the probes may be compared to a reference thermometer inserted into the block The reference thermometer may be inserted 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 difference between one hole and another causing 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 tempera ture to stabilize before making measurements Because of temperature varia tions along the length of the well best results are obtained when comparing probes of similar constructi
60. ng the temperature to 25 C and waiting for the instrument to reach temperature before turning the in strument off 9122A 13 4 Quick Start 4 3 Power Plug the dry well power cord into a mains outlet of the proper voltage fre quency and current capability Refer to Section 3 1 Specifications for the power details 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 tempera ture set point The front panel LED display will indicate the actual dry well temperature 4 4 Setting the Temperature Section 7 3 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 program in the new set point 4 Press EXIT twice 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 indicator 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 60 minutes to reach the set point depending on the span Another 5 to 10 minutes is required to settle within 1 C of the s
61. on 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 simultaneously In order to eliminate noise the GPIB cable should be shielded 8 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 pro grammed within the IEEE 488 interface menu The IEEE 488 interface param eters menu is outlined in Figure 5 To enter the IEEE 488 parameter programming menu first press EXIT while pressing SET and release to enter the secondary menu Press SET repeat edly until the display reaches PrObE This is the menu selection Press UP repeatedly until the IEEE 488 interface menu is indicated with IEEE Press SET to enter the IEEE 488 parameter menu The IEEE 488 menu contains the IEEE 488 address parameter 8 2 1 1 IEEE 488 Interface Address The IEEE 488 address is prompted with AddrESS Press SET to program the address The default address is 22 Change the device address of the calibra tor if necessary to match the address used by the communication equipment by pressing UP or DOWN and then SET 8 2 2 IEEE 488 Operation Commands may now be sent via the IEEE 488 interface to read or set the tem perature or access other controller
62. on and inserting them the same depth into the well 20 Hart Scientific 6 General Operation 7 Controller Operation This section 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 set the cut out set point and program the probe calibra tion parameters operating parameters serial and IEEE 488 interface configuration and controller calibration parameters Operation of the primary functions is summarized in the flowchart in Figure 5 on page 22 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 display reading Explanation of the button or display reading are to the right of each button or display value 7 1 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 100 00 C Well temperature in degrees Celsius The temperature display function may be accessed from any other function by pressing the EXIT button 7 2 Reset Cut out If the over temperature cut out ha
63. portional band on the Report of Calibration Display flashes cut out The software cut out is set too low Check the cut out setting in the Set point menu Temperature readout is not the actual tempera ture of the well With the unit stable slowly rotate the unit If no change occurs the unit may need to be calibrated Contact a Hart Scientific Authorized Service Center 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 temperature is correct in this new area or deviates differently than the first area RF energy is present in the room If you have to perform the test in the effected area use the comparison test to eliminate any possible errors 12 2 Comments 12 2 1 EMC Directive Hart Scientific s equipment has been tested to meet the European Electromag netic Compatibility Directive EMCEMC Directive 89 336 EEC The Decla ration of Conformity for your instrument lists the specific standards to which the unit was tested The instrument was designed specifically as a test and measuring device Com pliance to the EMC directive is through IEC 61326 1 Electrical equipment for measurement control and laboratory use EMC requirements 1998 As noted in the IEC 61326 1 the instrument can have varying configurations The instrument was tested in a typical configuration with shie
64. rature 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 1 100 0 Set point memory 1 100 0 C currently used 9122A 23 7 Controller Operation 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 7 3 2 Set point Value The set point value may be adjusted after selecting the set point memory 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 Press UP or DOWN to adjust the set point value If the set point value need not be changed then press EXIT to resume displaying the well temperature 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 in stead then any changes made to the set point will be ignored S Accept new set point value 7 4 Adjust Units This instrument can display temperature in C or F The temperature units are set at the factory
65. robes from excessive 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 temperature At this point the action of the cut out is determined by the setting of the cut out mode pa rameter The cut out has two modes manual reset or automatic reset If the mode is set to manual then the heater will remain disabled until the user manu ally resets the cut out If the mode is set to automatic then the cut out will au tomatically reset itself when the temperature falls below the reset temperature allowing the well to heat up again The 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 34 Hart Scientific 7 Controller Operation 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 f
66. rt 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 when the cut out is active 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 be fore the cut out can be reset 7 3 Temperature Set point The temperature set point can be set to any value within the range and with res olution 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 adjusted to help prevent this occurrence Setting the temperature involves two steps 1 select the set point memory and 2 adjust the set point value 7 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 tempe
67. s and actions that may damage the instru ment being used 1 2 1 Warnings To avoid personal injury follow these guidelines GENERAL DO NOT use this instrument in environments other than those listed in the User s Guide Inspect the instrument for damage before each use DO NOT use the in strument if it appears damaged or operates abnormally Follow all safety guidelines listed in the user s manual Calibration Equipment should only be used by Trained Personnel If this equipment is used in a manner not specified by the manufacturer the protection provided by the equipment may be impaired 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 2 Hart Scientific 1 Before You Start CAT 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 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 other use of the instrument may cause unknown hazards to the user Completely unatten
68. s been triggered then the temperature display will alternately flash Cut out Cut out Indicates cut out condition The message will continue to flash until the operator intervenes and resets the instrument The cut out has two modes manual reset and automatic reset See Section 7 9 2 2 The mode determines how the cut out is reset which allows the instru ment to heat up again With manual reset mode the cut out must be reset by the operator after the temperature falls below the set point When in automatic mode the cut out will reset itself as soon as the temperature is lowered below the cut out set point The unit is set in manual mode at the factory 9122A 21 7 Controller Operation 22 Hart Scientific 7 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 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 In
69. s the programmed set point 6 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 power entry module 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 appropriate 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 6 Ensure the PEM and heater switch match voltage settings 6 3 Setting the Temperature Section 7 3 explains in detail how to set the temperature set point on the cali brator using the front panel keys The procedure is summarized here 9122A 19 6 General Operation 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 twice 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 indicator a two color LED will also indicate on red and heating or off green and cooli
70. 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 1 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 Re port of Calibration to restore the calibration parameters 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 The probe and the block may expand at different rates Allow for probe expansion inside the well as the block heats Otherwise the probe may beco
71. t are to be cali brated are inserted five fixed diameter holes are provided with adequate clear ance for 0 25 inch diameter sensors Four 0 75 inch diameter holes are provided that may be used for sensors of that size or sleeved down with various sized probe sleeves Heaters surround the block and have a tapered heat density to compensate for heat loss out of the top A high temperature platinum RTD is imbedded to sense the temperature of the block The entire assembly is insu lated and isolated from the exterior sheet metal and circuit board and grounded to earth ground 9122A 17 5 Parts and Controls Probe Sleeve Figure 4 Constant Temperature Block Assembly 5 3 2 Probe Sleeves and Tongs The calibrator is supplied with four 1 8 3 16 1 4 and 3 8 inch alumi num bronze probe sleeves for insertion into the calibrator well and tongs for re moving the sleeves Probe sleeves of various internal hole sizes are available to allow the user s probe to fit snugly into the well whatever the diameter of the probe Standard Probe Sleeve Sizes Model Number Size 2152 Blank insert 2153 116 insert 2154 18 insert 2155 5 32 insert 2156 3 16 insert 2157 14 insert 2158 5 16 insert 2159 3 8 insert 2160 12 insert 2161 5 8 insert 2162 1 user specified hole 2163 2 user specified holes 5 3 3 Well and Sleeve Cleaning Kit Model 2037 The calibr
72. t 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 7 6 3 Scan Hold In addition to controlling the hold temperature display a switch can also con trol 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 7 5 1 and 7 5 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 setting 9122A 27 7 Controller Operation 7 6 4 Switch Wiring The thermal switch or cut out is wired to the calibrator at the two terminals at the back of the dry well calibrator labeled DISPLAY HOLD The switch wires may be connected to the terminals either way Int
73. terface 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 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 C F Figure 5 Controller Function Flowcha
74. the commands will be executed but not ech oed 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 dUP HALF New duplex mode setting 7 9 3 4 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 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 9122A 39 7 Controller Operation LF OFF New linefeed setting 7 9 4 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 instruments not fit ted with the interface The menu is indicated by IEEE IEEE 488 parameters menu Press SET to enter the menu 7 9 4 1 IEEE 488 Address The IEEE 488 interface must be configured to use the same address as the ex ternal communicating device The address is indicated by AddrESS IEEE 488 interface address Press SET
75. ticular specification without having to wait for complete stabilization Inserting a cold probe into a well will require another stabilization period de pending on the magnitude of the disturbance and the required accuracy For ex ample inserting a 0 25 inch diameter room temperature probe into a sleeve at 300 C will take about 5 minutes to be within 0 1 C of its settled point and will take 30 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 9122A 55 9 Test Probe Calibration 15 min 20 min 25 to 30 min typical Within 0 1 C Within 0 5 C Overshoot Stable Control Scan to Setpoint Figure 13 Useable Calibration Range Prior to Stabilization 10 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 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 measure the well temperature with higher accuracy than the desired accuracy of the dry well By using a good thermometer and carefully following this procedure the calibrator can be cali
76. ts are in degrees C per minute 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 9122A 25 7 Controller Operation 7 6 Display Hold The 9122A has a display hold function which allows action of an external switch to freeze the displayed temperature and stop the set point from scan ning This is useful for testing thermal switches and cut outs This section ex plains 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 Ferrites should be used when connecting a thermal switch to the Switch Hold See Section 12 2 2 Using Clamp on Ferrites for details 7 6 1 Hold Temperature Display When the hold feature is enabled you can easily switch the display between the normal temperature display and the hold temperature display by simply press ing 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 means 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 position to
77. ud 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 opera tion and skip to the next parameter in the menu 7 9 3 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 temperature measure ments transmitted from the serial interface If the sample rate is set to 5 for in stance 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 The sample period is indicated by 38 Hart Scientific 7 Controller Operation SAnPLE Serial sample period parameter Press SET to choose to set the sample period The current sample period 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 7 9 3 3 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 will be immediately echoed or transmitted back to the device of origin With half duplex
78. unction is the configuration menu Press EXIT to resume display ing the well temperature 7 9 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 cut out set point function by pressing SET There are 5 sets of configuration parameters probe parameters oper ating 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 7 9 1 Probe Parameters The probe parameter menu is indicated by PrObE Probe parameters menu Press SET to enter the menu The probe parameters menu contains the pa rameters R0 ALPHA and DELTA which characterize the resistance tempera ture relationship of the platinum control sensor These parameters may be adjusted to improve the accuracy of the calibrator This procedure is explained in detail in Sectioin 10 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
79. xtreme care when removing hot inserts 9122A 3 1 Before You Start 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 For compliance with IEC 1010 1 it is recommended that the cutout mode always be set to the manual mode requiring user intervention to reset the instrument ELECTRICAL SHOCK These guidelines must be followed to ensure that the safety mechanisms in this instrument will operate properly This instrument must be plugged 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 op

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