9141 Users Guide 5B0702.vp
Contents
1. Display gt UP gt Temperature Switch Hold Display Mode A DOWN SET p SET DOWN I EXIT 1 Select Setpoint Toggles Display of Rs SET SET UP a EXIT Adjust Setpoint I Toggles C F SET Y LJ EXIT Units Secondary Functions gt SET SET EXIT lt EXIT Scan On Off Y lt EXIT Display Power SET Y SET le EXIT Scan Rate EXIT Set Proportional Band lt Y Configuration Menu UP L Operating Serial Menu 4 DOWN Parameters lt Interface PIS Menu 5 Y Y Y BAUD RO HL Rate SET EXIT SET EXIT SET EXIT SET EXIT SET EXIT SET EXIT Sample 4 ATTA J lt Period lt SET EXIT SET EXIT2. ALPHA Sample SET EXIT SET EXIT DELTA lt Duplex SET EXIT SET EXIT Adj DELTA Adj Duplex Mode SET EXIT SET EXIT Y Linefeed lt n SET EXIT gt SET EXIT Figure 5 Controller Operation Flowchart 22 7 Controller Operation Temperature Set point 7 2 2 7 2 3 180 0 Well temperature in degrees Celsius SET Access set point memory Ta Press SET to accept the new selection and access the set point value SET Accept selected set point memory Set point Value The set point value may be adjusted after selecting the set point memory and pressing SET qu 200 E Set point 4 value in C If the set point value is correct then press EXIT to resume displaying the well temperature To change the set point values press SET and then press UP or DOWN to adjust the set point value 220 i New set point value When the desired set point value is reached press SET to accept the new value and access the temperature scale units selection If EXIT 15 pressed in stead then any changes made to the set point will be ignored SET Accept new set point value Temperature Scale Units The temperature scale units of the controller maybe set by the user to degrees Celsius C or Fahrenheit F The units are used
3. Calibration 9141 Dry well Calibrator User s Guide PN 3729494 January 2013 2013 Fluke Corporation All rights reserved Specifications are subject to change without notice All product names are trademarks of their respective companies Table of Contents 1 Before You Start 6 a sosa san hd pn 1 1 1 Symbols USE 3 sr V xe wr en ak et 1 L2 2 1 2 1 WARNINGS gt 4 u ua 5 a a EUR RA Go A Ba Ses 2 1 2 2 CAUTIONS aap tc etes te pon 4 1 3 Authorized Service 6 2 mtrod cti n 4 5 4 s s se 99 EC ia 9 3 Specifications and Environmental Conditions 11 3 1 Specifications ss e e race a ccc 11 3 2 Environmental 11 3 9 OH ER EEE 12 4 13 4 1 osos dox BRS Ra 13 a2 2 oso o gt owe PSR QS RA 13 43 9 at rk 14 4 4 Selling the Temporales s s bee FRE S OS 14 5 15 5 1 Bottom Panel ecos eae u ERS 15 3 2 Prone c Mc 16 5 3 Constant Temperature Block Assembly 17 5 3 1 Constant Temperature Block
4. m 100 Ambient 6 8 Time in Minutes Figure 7 Typical Heating Rate 540 430 320 210 Block Temperature C 100 Ambient 12 16 Time in Minutes Figure 8 Typical Cooling Rate 41 10 Calibration Procedure Calibration Points 10 10 1 10 2 10 2 1 Calibration Procedure Sometimes the user may want to calibrate the dry well to improve the tempera ture set point accuracy Calibration is done by adjusting the controller probe calibration constants R ALPHA and DELTA so that the temperature of the dry well as measured with a standard thermometer agrees more closely with the set point The thermometer used must be able to measure the well temperature with higher accuracy than the desired accuracy of the dry well By using a good thermometer and following this procedure the dry well can be calibrated to an accuracy of better than 0 5 C up to 450 C and 1 5 C above 450 C Calibration Points In calibrating the dry well Ry ALPHA and DELTA are adjusted to minimize the set point error at each of three different dry well temperatures Any three reasonably separated temperatures may be used for the calibration Improved results can be obtained for shorter ranges when using temperatures that are just within the most useful operating range of the dry well The farther apart the calibration temperatures the larger will be the calibrated temperature range but the calibration error will also be greater ov
5. The next parameter is the duplex mode indicated with dUPL The duplex mode may be set to half duplex HALF or full duplex FULL With full duplex any commands received by the thermometer via the serial interface are immediately echoed or transmitted back to the device of origin With half du plex the commands are executed but not echoed The default setting is full du plex The mode may be changed using UP or DOWN and pressing SET Linefeed The final parameter in the serial interface menu is the linefeed mode This pa rameter enables On or disables OFF transmission of linefeed charac ter LF ASCII 10 after transmission of any carriage return The default setting 15 with linefeed on The mode may be changed using UP or DOWN and pressing SET Serial Operation Once the cable has been attached and the interface set up properly the control ler immediately begins transmitting temperature readings at the programmed rate The serial communications uses 8 data bits one stop bit and no parity The set point and other commands may be sent via the serial interface to set the 8 Digital Communication Interface Interface Commands 8 2 temperature set point and view or program the various parameters The inter face commands are discussed in Section All commands are ASCII character strings terminated with a carriage return character CR ASCII 13 Interface Comma
6. srede vocate ni o o 17 5 3 2 Probe Sleeves and Tongs cele 18 6 1 19 6 1 Changing Display Units 52644 xS 19 6 2 Switching to 230V 19 7 21 7 1 Well Temperature 21 72 Temperanire Setpoint s e kdb se x Gute 2 7 2 1 Programmable Set points 2 2 21 7 2 2 set point Valle a daa ONS a Gre Hd d E 23 7 2 3 Temperature Scale 116 23 7 3 LE AAA A 24 7 3 1 Scan Control zuo zoe oon EROR do 24 1 3 2 Scan Rate din 6 2 4 4 uos Sac E 2 hae EUG RE A LG ESS 24 7 4 Temperature Display Hold 25 7 4 1 Hold Temperature Display 25 7 4 2 Mode Setting esos BE er 25 743 25 7 4 4 Switch Test Example 26 Ts Secondary Men s so s 2 sosca od oe x wo 26 7 6 Heater POWer ses hw eh 9 vw 48 ai E Sw 2 26 717 Proportiopal Bandon 46 44 244 g kae 27 7 8 Controller Configuration x s 28 7 9 Calibration Parameters 28 7 9 1 Risus dy we ee a eS A ES 29 7 9 2 ALPHA A ee Se Boe
7. 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 10 Operating Parameters The operating parameters menu is indicated by PAF Operating parameters menu Press UP to enter the menu The operating parameters menu contains the HL High Limit parameter The HL parameter adjusts the upper set point tempera 29 9141 Dry well Calibrator User s Guide 30 7 11 7 11 1 ture The factory default and maximum are set to 650 C For safety a user can adjust the HL down so the maximum temperature set point is restricted HL i High Limit parameter Pres SET to accept the new temperature limit Serial Interface Parameters The serial RS 232 interface parameters menu is indicated by SErcIRL 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 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 c
8. Press UP until the serial interface menu is indicated with SEr AL Finally press SET to enter the serial parameter menu In the serial interface parameters menu are the BAUD rate the sample rate the duplex mode and the linefeed parameter Baud Rate The baud rate is the first parameter in the menu The display will prompt with the baud rate parameter by showing b AU g Press SET to choose to set the baud rate The current baud rate value will then be displayed The BAUD rate of the 9141 serial communications may be programmed to 300 600 1200 2400 4800 or 9600 baud The baud rate is pre programmed to 2400 BAUD Use UP or DOWN to change the baud rate value Press SET to set the baud rate to the new value or EXIT to abort the operation and skip to the next parameter in the menu Sample Period The sample period is the next parameter in the menu and prompted with SPEr The sample period is the time period in seconds between temperature measurements transmitted from the serial interface If the sample rate 15 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 Press SET to choose to set the sample pe riod Adjust the period with UP or DOWN and then use SET to set the sample rate to the displayed value Duplex Mode
9. design of the thermometer probes inserted into the calibrator and the temperature For best results insert probe to full depth of well Heating and Cooling Rates Figures 7 and 8 show typical heating cooling rates of the 9141 dry well calibrator DO NOT remove inserts when heating or when the unit is hot Stabilization and Accuracy The stabilization time of the dry well calibrator will depend on the conditions and temperatures involved Typically the test well will be stable to 0 1 C within 5 minutes of reaching the set point temperature as indicated by the display Ul timate stability will be achieved 10 to 20 minutes after reaching the set temperature 39 9141 Dry well Calibrator User s Guide 40 Inserting a cold probe into a well will require another period of stabilizing de pending on the magnitude of the disturbance and the required accuracy For ex ample inserting 25 inch diameter room temperature probe into a sleeve at 300 C will take 5 minutes to be within 0 1 C of its settled point and will take 10 minutes to achieve maximum stability Speeding up the calibration process can be accomplished by knowing how soon to make the measurement It is recommended that typical measurements be made at the desired temperatures with the desired test probes to establish these times 9 Test Probe Calibration Dry well Characteristics 600 500 400 300 200 O o 3 5
10. in displaying the well tem perature set point and proportional band Press SET after adjusting the set point value to change display units Un Scale units currently selected Press UP or DOWN to change the units 23 9141 Dry well Calibrator User s Guide 24 7 3 7 3 1 7 3 2 Un F i New units selected Scan The scan rate can be set and enabled so that when the set point is changed the dry well heats or cools at a specified rate degrees per minute until it reaches the new set point With the scan disabled the dry well heats or cools at the maximum possible rate Scan Control The scan is controlled with the scan on off function that appears in the main menu after the temperature scale units i Scan function off Press SET to accept the present setting and continue SET Accept scan setting Scan Rate The next function in the main menu is the scan rate The scan rate can be set from 1 to 99 9 C min The maximum scan rate however is actually limited by the natural heating or cooling rate of the instrument This is often less than 100 C min especially when cooling The scan rate function appears in the main menu after the scan control function The scan rate units are in degrees per minute degrees C or F depending on the selected units Press SET to accept the new scan rate and continue SET Accept scan rate 7 Controller Operation Temperature Displ
11. non defective media Fluke does not warrant that software will be error free or operate without interruption Fluke authorized resellers shall extend this warranty on new and unused products to end user customers only but have no authority to extend a greater or different warranty on behalf of Fluke Warranty support is available only if product is purchased through a Fluke authorized sales outlet or Buyer has paid the applicable international price Fluke reserves the right to invoice Buyer for importation costs of repair replacement parts when product purchased in one country is submitted for repair in another country Fluke s warranty obligation is limited at Fluke s option to refund of the purchase price free of charge repair or replacement of a defective product which is returned to a Fluke authorized service center within the warranty period To obtain warranty service contact your nearest Fluke authorized service center to obtain return authorization information then send the product to that service center with a description of the difficulty postage and insurance prepaid FOB Destination Fluke assumes no risk for damage in transit Following warranty repair the product will be returned to Buyer transportation prepaid FOB Destination If Fluke determines that failure was caused by neglect misuse contamination alteration accident or abnormal condition of operation or handling including overvoltage failures caused by use outside the
12. off display by pressing the DOWN button on the front panel 49 9141 Dry well Calibrator User s Guide 50 12 2 12 2 1 Unstable display Wait Allow the instrument to stabilize for a few minutes Proportional band may be incorrect Refer to the proportional band on the Re port of Calibration Electrical Noise If the unit is being used in the field take it to a different location calibration lab to see if the display becomes stable If the display is stable in the new location there may be electrical noise generated by equipment in the field in terfering with the control The display shows Controller problem The error messages signify the following problems with the an error controller Err 1 a RAM error Err 2 aNVRAM error Err 3 a Structure error Err 4 anADC setup error Err 5 ADC ready error 6 defective control sensor sensor is disconnected or shorted Insure that the sensor is connected Err 1 aheater error the fan will go on high speed Initialize the system by performing the Factory Reset Sequence described above If the unit repeats the error code contact a Hart Scientific Authorized Service Center for assistance Temperature cannot be set above a cer tain point Incorrect High Limit parameter The High Limit parameter may be set below 125 C Check this value as described in Section 7 10 Operating Parameters AC voltage is pres ent on the insert or block Impro
13. product s specified rating or normal wear and tear of mechanical components Fluke will provide an estimate of repair costs and obtain authorization before commencing the work Following repair the product will be returned to the Buyer transportation prepaid and the Buyer will be billed for the repair and return transportation charges FOB Shipping Point THIS WARRANTY IS BUYER S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE FLUKE SHALL NOT BE LIABLE FOR ANY SPECIAL INDIRECT INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES INCLUDING LOSS OF DATA ARISING FROM ANY CAUSE OR THEORY Since some countries or states do not allow limitation of the term of an implied warranty or exclusion or limitation of incidental or consequential damages the limitations and exclusions of this warranty may not apply to every buyer If any provision of this Warranty is held invalid or unenforceable by a court or other decision maker of competent jurisdiction such holding will not affect the validity or enforceability of any other provision Fluke Corporation Fluke Europe B V P O Box 9090 P O Box 1186 Everett WA 98206 9090 5602 BD Eindhoven U S A The Netherlands 11 99 4 Quick Start Unpacking 4 1 4 2 Quick Start Unpacking Unpack the dry well carefully and inspect it for any damage that may have oc
14. terms Warning and Caution e Warning identifies conditions and actions that may pose hazards to the user Caution identifies conditions and actions that may damage the instru ment being used 1 2 1 A 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 e Inspect the instrument for damage before each use DO NOT use the in strument if it appears damaged or operates abnormally e Follow all safety guidelines listed in the user s manual e Calibration Equipment should only be used by Trained Personnel e fthis equipment is used a manner not specified by the manufacturer the protection provided by the equipment may be impaired e Before initial use or after transport or after storage in humid or semi hu mid environments or anytime the dry well has not been energized for more than 10 days the instrument needs to be energized for a dry out period of 2 hours before it can be assumed to meet all of the safety re quirements of the IEC 1010 1 If the product is wet or has been in a wet environment take necessary measures to remove moisture prior to apply 1 Before You Start Safety Information ing power such as storage in a low humidity temperature chamber operat ing at 50 C for 4 hours or more DO NOT use this instrument for any application other than calibration work The instrument was designed
15. to 10 minutes is required to stabilize within 0 1 C of the set point Ul timate stability may take 15 to 20 minutes more of stabilization time 5 Parts and Controls Bottom Panel 5 Parts and Controls The user should become familiar with the dry well calibrator and its parts 5 1 Bottom Panel Figure 2 on page 15 Power Cord Underneath the calibrator is the removable power cord inlet that plugs into an IEC grounded socket Power Switch The power switch is located on the power entry module PEM The PEM also houses the fuses and the dual voltage selector The PEM and Heater Voltage Switch see below allow the unit to be field switchable for 115 VAC 10 or 230 VAC 10 operation eie Avpower 115 VAC 10 A 230VAC5A 50 60 Hz mm 115V 10 AF 250V E 230V 5 AF 250V HEATER VOLTAGE SWITCH Back View Figure 2 9141 Back Panel and Bottom HEATER VOLTAGE SWITCH Bottom View 15 9141 Dry well Calibrator User s Guide 16 5 2 A Heater Voltage Switch To be used only when changing the input voltage See Section 6 2 for instructions on changing the input voltage NOTE The input voltage and heater voltage switch settings should al ways be the same value Serial Port A DB 9 male connector is present for interfacing the calibrator to a computer or terminal with serial RS 232 communications Fan The fan inside the calibrator runs continuously when the unit is being op e
16. values to the factory settings The user should have a list of these constants and their settings with the instrument manual WARNING DO NOT change the values of the instrument calibration constants from the factory set values The correct setting of these parame ters is important to the safety and proper operation of the instrument The calibration parameters menu is indicated by CAL Calibration parameters menu Press SET five times to enter the menu The calibration parameters menu contains the parameters R ALPHA and DELTA which characterize the re sistance temperature relationship of the platinum control sensor These parame ters may be adjusted to improve the accuracy of the calibrator The calibration parameters are accessed by pressing SET after the name of the parameter is displayed The value of the parameter may be changed using the UP and DOWN buttons After the desired value is reached press SET to set the parameter to the new value Pressing EXIT causes the parameter to be skipped ignoring any changes that may have been made 7 9 1 R 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 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 7 9 3
17. with the safety guidelines and operating procedures of the calibrator as de scribed in the instruction manual 3 Specifications and Environmental Conditions Specifications 3 1 3 2 Specifications and Environmental Conditions Specifications Power 115 VAC 10 50 60 Hz 1000 Watts and 230 VAC 10 50 60 Hz switchable Ambient Temperature 5 50 C 41 121 F Operating Range 50 650 C 122 1202 F Resolution 0 1 C or F resolution Readout Switchable C or F Accuracy 0 5 C up to 400 C 1 C 400 C to 650 C 2 C for holes greater than 6 5 mm 0 25 Stability 0 05 C at 100 C 0 12 C at 500 C 0 12 C at 650 C Uniformity 0 1 C below 400 C 0 5 C with similar sized wells above 400 C Controller Hybrid analog digital controller with data retention Heater 1000 W Heating Times 12 minutes from ambient to 650 C Cooling Times 25 minutes from 650 C to 100 C Stabilization Time 7 minutes Immersion Depth 124 mm 4 875 Cooling 2 speed internal fan Fault Protection Sensor burnout and short protection over temperature thermal cutout Test Wells 1 125 4 87 deep Multi hole inserts are available Size 236 mm H x 109 W x 185 mm D 9 3 x 4 3 x 7 3 Weight 3 6 kg 8 Ibs Environmental Conditions Although the instrument has been designed for optimum durability and trou ble free operation
18. 0V fuses e Replace the fuse holder with the 230V in the display window e Using the same straight slot screwdriver move the heater switch to dis play 230V See the rear panel drawing in Figure 2 on page 15 NOTE If the heater switch and the fuse holder do not both read 230V when complete the unit will either not heat or only heat at a fraction of its capacity Ifnot done properly the unit could become damaged and void the calibration and warranty Use 10 amp fuses for 115V and 5 amp for 230V only DO NOT PLUG THE UNIT INTO 230 V IF THE HEATER SWITCH AND FUSE HOLDER READ 115 THIS WILL CAUSE THE FUSES TO BLOW AND MAY DAMAGE THE INSTRUMENT 19 7 Controller Operation Well Temperature 7 1 7 2 7 2 1 Controller Operation This chapter discusses in detail how to operate the dry well temperature con troller using the front control panel Using the front panel key switches and LED display the user may monitor the well temperature set the temperature set point in degrees C or F monitor the heater output power adjust the control ler proportional band and program the calibration parameters operating pa rameters and serial interface configuration Operation of the functions and parameters are shown in the flowchart in Figure 5 on page 22 This chart may be copied for reference In the following discussion a button with the word SET UP EXIT or DOWN inside indicates the panel button while the dotted box indicat
19. 1t 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 e temperature range 5 50 C 41 122 F e ambient relative humidity maximum 80 for temperature lt 31 C de creasing linearly to 50 at 40 e pressure 75kPa 106kPa e mains voltage within 10 of nominal vibrations in the calibration environment should be minimized 11 9141 Dry well Calibrator User s Guide 12 e altitude does not effect the performance or safety of the unit 3 3 Warranty LIMITED WARRANTY AND LIMITATION OF LIABILITY Each Fluke product is warranted to be free from defects in material and workmanship under normal use and service The warranty period is one year and begins on the date of shipment Parts product repairs and services are warranted for 90 days This warranty extends only to the original buyer or end user customer of a Fluke authorized reseller and does not apply to fuses disposable batteries or to any product which in Fluke s opinion has been misused altered neglected contaminated or damaged by accident or abnormal conditions of operation or handling Fluke warrants that software will operate substantially in accordance with its functional specifications for 90 days and that it has been properly recorded on
20. Used to decrement the displayed value of parameters UP Used to increment the displayed value EXIT Used to exit a function and skip to the next function Any changes made to the displayed value are ignored 5 3 Constant Temperature Block Assembly Figure 4 on page 17 5 3 1 Constant Temperature Block The Block is made of aluminum bronze and provides a relatively constant and accurate temperature environment for the sensor that is to be calibrated A 28 6 mm 1 125 inch diameter well is provided that may be used for sensors of that size or may be sleeved down with various sized multi hole probe sleeves Heaters surround the block assembly and provide even heat to the sensor A high temperature platinum RTD is imbedded at the base of the block assembly to sense and control the temperature of the block The entire assembly is sus pended in an air cooled chamber thermally isolated from the chassis and electronics Interchangeable Insert Options Insert A Insert Insert C Insert D 1 3 mm 4 mm 6 mm 6 mm 3 mm 1 8 Figure 4 Inserts available for the 9141 block assembly 17 9141 Dry well Calibrator User s Guide CAUTION The block vent cover be very hot due the fan blowing upward Please use caution 5 3 2 Probe Sleeves and Tongs 18 The calibrator is supplied with a multi hole aluminum bronze probe sleeve for insertion into the calibrator well and tongs for removing
21. arameters is important to the safety and proper operation of the calibrator DO NOT slam the probe sheath in to the well This type of action can cause a shock to the sensor and affect the calibration The instrument and any thermometer probes used with it are sensitive in struments that can be easily damaged Always handle these devices with care DO NOT allow them to be dropped struck stressed or overheated The Factory Reset Sequence see Section 12 Troubleshooting should be performed only by authorized personnel if no other action is successful in correcting a malfunction You must have a copy of the most recent Report of Calibration to restore the calibration parameters 9141 Dry well Calibrator User s Guide DO NOT operate this instrument in an excessively wet oily dusty or dirty environment Always keep the well and inserts clean and clear of foreign material The dry well is a precision instrument Although it has been designed for optimum durability and trouble free operation it must be handled with care Always carry the instrument in an upright position to prevent the probe sleeves from dropping out The convenient handle allows for hand carrying the instrument If a mains supply power fluctuation occurs immediately turn off the in strument Power bumps from brown outs could damage the instrument Wait until the power has stabilized before re energizing the instrument Allow for probe expansion inside the well
22. as the block heats Most probes have handle temperature limits Be sure that the probe handle temperature limit is not exceeded in the air above the instrument 1 3 Authorized Service Centers Please contact one of the following authorized Service Centers to coordinate service on your Hart product Fluke Corporation Hart Scientific Division 799 E Utah Valley Drive American Fork UT 84003 9775 USA Phone 1 801 763 1600 Telefax 1 801 763 1010 E mail support hartscientific com Fluke Nederland B V Customer Support Services Science Park Eindhoven 5108 5692 EC Son NETHERLANDS Phone 31 402 675300 Telefax 31 402 675321 E mail ServiceDesk fluke nl Fluke Int l Corporation Service Center Instrimpex 1 Before You Start Authorized Service Centers Room 2301 Sciteck Tower 22 Jianguomenwai Dajie Chao Yang District Beijing 100004 PRC CHINA Phone 86 10 6 512 3436 Telefax 86 10 6 512 3437 E mail xingye han fluke com cn Fluke South East Asia Pte Ltd Fluke ASEAN Regional Office Service Center 60 Alexandra Terrace 03 16 The Comtech Lobby D 118502 SINGAPORE Phone 65 6799 5588 Telefax 65 6799 5588 E mail antng singa fluke com When contacting these Service Centers for support please have the following information available e Model Number Serial Number e Voltage e Complete description of the problem 2 Introduction Introduction The Hart Scientific 9141 High Temp Fiel
23. ay Hold 7 4 7 4 1 7 4 2 7 4 3 Temperature Display Hold The 9141 has a display hold function which allows action of an external switch to freeze the displayed temperature and stop the set point from scanning This is useful for testing thermal switches and cutouts This section explains the functions available for operating the temperature hold feature An example fol lows showing how to set up and use the hold feature to test a switch Hold Temperature Display The hold feature is enabled by simply pressing the UP button The hold tem perature display shows the hold temperature on the right and the switch status on the left For the status means the switch is closed and means the switch is open The status flashes when the switch is in its active position op posite the normal position The hold temperature shows what the temperature of the well was when the switch changed from its normal position to its active position While the switch is in the normal position the hold temperature will follow the well temperature Operation of the hold temperature display is out lined below 143 5 Well temperature display Access hold display c 1448 a Switch status and hold temperature To return to the normal well temperature display press DOWN Mode Setting The Hold Function is always in the automatic mode In this mode the normal position is set to whatever the switch position is when the set po
24. by Hart users should check with a Hart Scientific Authorized Service Center to be sure that the proposed method will not damage the equipment e 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 47 12 Troubleshooting 12 12 1 Troubleshooting This section contains information on troubleshooting CE Comments and a wiring diagram Troubleshooting Problems Possible Causes and Solutions In the event that the instrument appears to function abnormally this section may help to find and solve the problem Several possible problem conditions are described along with likely causes and solutions If a problem arises please read this section carefully and attempt to understand and solve the problem If the problem cannot otherwise be solved contact a Hart Scientific Authorized Service Center see Section 1 3 for assistance Be sure to have the instru ment s model number serial number voltage and problem description available Problem Possible Causes and Solutions Incorrect tempera Incorrect ALPHA DELTA or BETA parameters Find the value for AL ture reading PHA DELTA and BETA on the Report of Calibration Reprogram the parameters into the instrument see Section 7 9 Calibration Parameters Allow the instrument to stabilize and verify the accuracy of the temperature reading Controller lo
25. calibrator to warm up for 10 minutes after power up and then allow adequate stabilization time after reach ing the set point temperature After completing operation of the calibrator al low the well to cool by setting the temperature to 100 C for one half hour before switching the power off Calibrating a Single Probe Insert the probe to be calibrated into the well of the dry well calibrator The probe should fit snugly into the calibrator probe sleeve yet should not be so tight that it cannot be easily removed Avoid any dirt or grit that may cause the probe to jam into the sleeve Best results are obtained with the probe inserted to the full depth of the well Once the probe is inserted into the well allow ade quate stabilization time to allow the test probe temperature to settle as de scribed above Once the probe has settled to the temperature of the well it may be compared to the calibrator display temperature The display temperature should be stable to within 0 1 C degree for best results CAUTION Never introduce any foreign material into the probe hole of the insert Fluids etc can leak into the calibrator causing damage to the calibrator or binding and damage to your probe Dry well Characteristics There is a temperature gradient vertically in the test well The heater has been applied to the block in such a way as to compensate for nominal heat losses out of the top of the dry well However actual heat losses will vary with
26. cked up The controller may have locked up due to a power surge other aberration Initialize the system by performing the Factory Reset Sequence Factory Reset Sequence Hold SET and EXIT down at the same time while turning on the instrument The instrument displays shows init the model number and the firmware version release SET and EXIT Each of the controller param eters and calibration constants must be reprogrammed The values can be found on the Report of Calibration The instrument Incorrect scan and scan rate settings The scan and scan rate settings may be heats or cools too set to unwanted values Check the Scan and Scan Rate settings The scan may be quickly or too slowly Off if the unit seems to be responding too quickly The scan may be on with the Scan Rate set low if unit seems to be responding too slowly Improper line voltage Verify that the voltage reading in the bottom of the unit matches the source voltage Improper switch setting Check the 115 VAC 230 VAC switch on the PEM power entry module Make sure this switch is set to the correct type of input voltage Check the 115 VAC 230 VAC heater switch Make sure this switch is set to the cor rect type of input voltage An is displayed External Switch open The external switch is open causing the displayed tempera at the left of the ture to be frozen and keeping the set point from scanning Turn the Switch Test
27. collecting data using a computer connected to the RS 232 port To set up the test do the following steps 1 Connect the switch wires to the terminals on the front of the dry well and place the switch in the well 2 Enable set point scanning by setting the scan to ON in the primary menu see Section 7 3 1 3 Set the scan rate to a low value say 1 0 C min see Section 7 3 2 If the scan rate is too high you may lose accuracy because of transient temperature gradients If the scan rate is too low the duration of the test may be longer than is necessary You may need to experiment to find the best scan rate 4 Set the first program set point to a value below the expected lower switch temperature say 40 C in the program menu 5 Set the second program set point to a value above the expected upper switch temperature say 90 C 6 Set the program soak time to allow enough time to collect a number of data points say 2 minutes 7 Collect data on a computer connected to the RS 232 port Refer to Section 8 for instructions on configuring the RS 232 communications interface Secondary Menu Functions which are used less often are accessed within the secondary menu The secondary menu is accessed by pressing SET and EXIT simulta neously and then releasing The first function in the secondary menu is the heater power display See Figure 5 on page 22 Heater Power The temperature controller controls the tempera
28. curred during shipment If there is shipping damage notify the carrier immediately Verify that the following components are present 9141 Dry well e 3141 2 Insert A e Power Cord e Manual e Report of Calibration e Calibration Label e Heat Shield e 9930 e RS 232 Cable e Insert Removal Tool Set Up Place the calibrator on a flat surface with at least 6 inches of free space around and 18 inches above the instrument Plug the power cord into a grounded mains outlet Observe that the nominal voltage corresponds to that indicated on the back of the calibrator Place the heat shield on the unit to deflect high tempera tures from the probe hubs see Figure 1 on page 5 CAUTION The heat shield may become very hot Use extreme caution Carefully insert the probe sleeve into the well DO NOT drop the sleeve in the well Probe sleeve holes should be of the smallest diameter possible while still allowing the probe to slide in and out easily Sleeves with various hole sizes are available from Hart Scientific The well must be clear of any foreign objects dirt and grit before the sleeve is inserted The sleeve is inserted with the two small tong holes positioned upward Turn on the power to the calibrator by toggling the switch on the power entry module The fan should begin quietly blowing air through the instrument and the controller display should illuminate after 3 seconds After a brief self test the controller should begin
29. d Acceptable Command Description Format Example Returned Example Values Display Temperature Read current set point s etpoint 5 set 9999 99 C or set 150 00 C Set current set point to n s etpoint n s 350 Instrument Range Read temperature temperature t t 9999 9 C or F t556C Read temperature units u nits u X C Set temperature units u nits c f CorF Set temperature units to Celsius u nits c Set temperature units to u nits f u f Fahrenheit Read scan mode sc an SC Sc ON or OFF Sc ON Set scan mode sc an on off Sc on ON or OFF Read scan rate sr ate sr srat 99 9 C or FYmin srat 12 4 C min Set scan rate sr ate n sr 1 1 1 to 99 9 Read hold ho ho open closed 99 9 C ho open 30 5C or F Secondary Menu Read proportional band setting prlopband pr pb 999 9 pb 15 9 Set proportional band to n pr opband n pr 8 83 Depends on Configuration Read heater power po wer po po 999 9 po 1 3 duty cycle Configuration Menu Calibration Parameters Menu Read RO calibration parameter 0 r r0 999 999 r0 100 578 Set RO calibration parameter ton r 0 n r 100 324 98 0 to 104 9 Read ALPHA calibration al pha al al 9 9999999 al 0 0038573 parameter Set ALPHA calibration parameter al pha n al 0 0038433 002 to 006 ton Read DELTA calibration dellta de de 9 9999 de 1 507 parameter Set DELTA calibration parameter deflta n de 1 3742 0 3 0 Operating Parameters Menu Read High Limit hl hl 999 hl 600 Set H
30. d Calibrator may be used as a portable instrument or bench top temperature calibrator for calibrating thermocouple and RTD temperature probes The 9141 is small enough to use in the field and accurate enough to use in the lab Calibrations may be done over a range of 50 C to 650 C 122 F to 1202 F Temperature display of the 9141 is 0 1 degrees The dry well calibrator features Rapid heating and cooling e Interchangeable multiple hole probe sleeves e Convenient handle e RS 232 interface e Switchable AC Input 115 VAC or 230 VAC Built in programmable features include e Temperature scan rate control e Temperature switch hold e Eight Setpoint memory e Adjustable readout in C or F The temperature is accurately controlled by Hart s hybrid analog digital con troller The controller uses a precision platinum RTD as a sensor and controls the well temperature with a solid state relay triac driven heater The LED front panel continuously shows the current well temperature The temperature may be easily set with the control buttons to any desired tempera ture within the specified range The calibrator s multiple fault protection de vices insure user and instrument safety and protection The 9141 dry well calibrator was designed for portability low cost and ease of operation Through proper use the instrument will provide continued accurate calibration of temperature sensors and devices The user should be familiar
31. dards 51
32. ecau tions Before working inside the equipment turn power off and discon nect power cord 1 2 2 A CAUTIONS To avoid possible damage to the instrument follow these guidelines Always operate this instrument at room temperature between 41 F and 122 F 5 C to 50 C Allow sufficient air circulation by leaving at least 6 inches 15 cm of clearance around the instrument Component lifetime can be shortened by continuous high temperature op eration Hart Scientific strongly recommends using the heat shield Figure 1 pro vided while operating the calibrator at temperatures above 200 C The heat shield protects the hub on the probes from heat and reduces the risk of the user being burned by the hub The heat shield gets very hot and 1 Before You Start Safety Information does not prevent all heat from reaching the hub Be careful when remov ing the heat shield or the probe from the well Figure 1 Heat shield installed on 9141calibrator DO NOT apply any type of voltage to the display hold terminals Apply ing a voltage to the terminals may cause damage to the controller DO NOT use fluids to clean out the well Fluids could leak into electron ics and damage the instrument Never introduce any foreign material into the probe hole of the insert Fluids etc can leak into the instrument causing damage DO NOT change the values of the calibration constants from the factory set values The correct setting of these p
33. ed it may be wiped clean with a damp cloth and mild detergent Do not use harsh chemicals on the surface which may damage the paint It is important to keep the well of the calibrator clean and clear of any eign matter Do not use fluid to clean out the well e The dry well calibrator should be handled with care Avoid knocking or dropping the calibrator e For dry wells with removable probe sleeves the sleeves can become ered with dust and carbon material If the buildup becomes too thick it could cause the sleeves to become jammed in the wells Avoid this build up by periodically buffing the sleeves clean sleeve should be dropped examine the sleeve for deformities before inserting it in the well If there is any chance of jamming the sleeve in the well file or grind off the protuberance e Do not slam the probe stems into the well This type of action can cause a shock to the sensor hazardous material is spilt on or inside the equipment the user is re sponsible for taking the appropriate decontamination steps as outlined by the national safety council with respect to the material e If the mains supply cord becomes damaged replace it with a cord with the appropriate gauge wire for the current of the instrument If there are any questions call a Hart Scientific Authorized Service Center for more information e Before using any cleaning or decontamination method except those rec ommended
34. eee ee Bae ee 29 7 9 3 DELTA uude Ger Se bY See ae eh eee ee xs 29 740 Parameters saca A 29 7 11 Serial Interface Parameters 30 PALA Baud cx a es a ao f Sus a Y 30 7 11 2 Sample Period i sr xc 4oR X Roe 31 7 11 3 Duplex Mode a asl a bc iaa le F 31 7 114 Tinefeed ir umo Ged 31 8 Digital Communication Interface 33 8 1 Serial 33 8 1 1 WIDE 33 8 1 2 x oe anc eee ee Ge 33 8 1 2 1 Baud Rate u ode 52 m Eod ow Bos Mod 34 5412 2 Sample Period oe ue rule Een de des At 34 8 123 Duplex Modes sir i d as sahen E RUE dd 34 8 1 2 4 Linefeed i do an dicic ancy rue Be OW qt tue ese puer la d 34 8 1 3 Serial Operation ceu ex OR ee ee ew Ee 34 8 2 Interface Commands 35 9 TestProbeCalibration 39 9 1 Calibrating Single Probe 4 65 Awe ss Sm ze x RSH 39 9 2 Dry well Characteristics koe RO BEG we os 39 92 1 Heating and Cooli
35. er the range If for instance 150 C to 350 C is chosen as the calibration range then the calibrator may achieve an ac curacy of say 0 3 C over the range 150 to 350 C Choosing a range of 200 C to 300 C may allow the calibrator to have a better accuracy of maybe 0 2 C over the range 175 to 325 C but outside that range the accuracy may be only 0 5 Calibration Procedure 1 Choose three set points to use in the calibration of the R ALPHA and DELTA parameters These set points are generally 50 C 250 C and 450 C but other set points may be used if desired or necessary 2 Set the dry well to the low set point When the dry well reaches the set point and the display is stable wait 15 minutes or so and then take a reading from the thermometer Sample the set point resistance by holding down the SET key and pressing the DOWN key Write these values down as T and R respectively 3 Repeat step 2 for the other two set points recording them as T R T3 and respectively 4 Using the recorded data calculate new values for R ALPHA and DELTA parameters using the equations given below Compute DELTA A T T B T T 43 9141 Dry well Calibrator User s Guide ll a Foal m a 71 E R R F R R delta DE CF T 3 Measured temperature using thermometer Value of R from display of 9141 Press SET and DOWN at the same time where T and are the measured tem
36. es the display reading Explanation of the button or display reading are to the right of each button or display value Well Temperature The digital LED display on the front panel allows direct viewing of the actual well temperature This temperature value is what is normally shown on the dis play The units C or F of the temperature value are displayed at the right For example 100 0 i Well temperature in degrees Celsius The temperature display function may be accessed from any other function by pressing the EXIT button Temperature Set point The temperature set point can be set to any value within the range and resolu tion as given in the specifications Be careful not to exceed the safe upper tem perature limit of any device inserted into the well Setting the temperature involves two steps 1 select the set point memory and 2 adjust the set point value Programmable Set points The controller stores 8 set point temperatures in memory The set points can be quickly recalled to conveniently set the calibrator to a previously programmed temperature set point To set the temperature one must first select the set point memory This function is accessed from the temperature display function by pressing SET The number of the set point memory currently being used is shown at the left on the display followed by the current set point value 21 9141 Dry well Calibrator User s Guide
37. f the BAUD rate setting Wiring The serial communications ca RS 232 Cable Wiring for ble attaches to the calibrator IBM PC and Compatibles through the D 9 connector at the back of the instrument Fig ure 6 shows the pin out of this Instrument Computer DTE connector and suggested cable Connector Connector wiring The serial cable should DB 9 Pin DB 9 Pin be shielded If the unit is used INC BED in a heavy industrial setting the Bi y serung 3TxD aeo serial cable must be limited to ANC 4DTR ONE meter 5 GND 5GND 6NC 6 DSR 2 Setu p 8CTS secr 9NC 9NC Before operation the serial in terface must first be set up by programming the BAUD rate Instrument Computer DTE and other configuration param Connector Connector eters These parameters are pro SPI DEZE grammed within the serial TNC nterf Th 2 e 2TxD interface menu The serial inter 3RxD face parameters menu is out 4NC e 4RTS lined in Figure 5 on page 22 SAN 5 5 enter the serial parameter TRIS lt 7 GND 8 CTS 4 e 8DCD programming mode first press INC L e 20DTR EXIT while pressing SET and release to enter the second Figure 6 Serial Cable Wiring 33 9141 Dry well Calibrator User s Guide 34 8 1 2 1 8 1 2 2 8 1 2 3 8 1 2 4 8 1 3 ary menu Press SET repeatedly until the display reads CAL
38. for temperature calibration Any other use of the instrument may cause unknown hazards to the user Completely unattended operation is not recommended Overhead clearance is required DO NOT place the instrument under a cabinet or other structure Always leave enough clearance to allow for safe and easy insertion and removal of probes If the instrument is used in a manner not in accordance with the equip ment design the operation of the dry well may impaired or safety haz ards may arise This instrument is intended for indoor use only BURN HAZARDS DO NOT turn the instrument upside down with the inserts in place the inserts will fall out DO NOT operate near flammable materials Use of this instrument at HIGH TEMPERATURES for extended periods of time requires caution DO NOT touch the well access surface of the instrument The block vent may be very hot due to the fan blowing across the heater block of the dry well The temperature of the well access is the same as the actual display tem perature e g if the instrument is set to 375 C and the display reads 375 C the well is at 375 C For top loading dry wells the top sheet metal of the dry well may exhibit extreme temperatures for areas close to the well access The air over the well can reach temperatures greater that 200 C for high temperature 400 C and higher dry wells Note Probes and inserts may be hot and should only be inserted and removed from t
39. he instrument when the instrument is set at temperatures less than 50 C Use extreme care when removing hot inserts DO NOT turn off the instrument at temperatures higher than 100 C This could create a hazardous situation Select a set point less than 100 C and allow the instrument to cool before turning it off The high temperatures present in dry wells designed for operation at 300 C and higher may result in fires and severe burns if safety precau tions are not observed ELECTRICAL SHOCK These guidelines must be followed to ensure that the safety mechanisms in this instrument will operate properly This instrument must be plugged 9141 Dry well Calibrator User s Guide into a 115 VAC 60Hz 230 VAC 50Hz optional AC only electric outlet The power cord of the instrument is equipped with a three pronged grounding plug for your protection against electrical shock hazards It must be plugged directly into a properly grounded three prong receptacle The receptacle must be installed in accordance with local codes and ordi nances Consult a qualified electrician DO NOT use an extension cord or adapter plug If supplied with user accessible fuses always replace the fuse with one of the same rating voltage and type Always replace the power cord with an approved cord of the correct rat ing and type HIGH VOLTAGE is used in the operation of this equipment SEVERE INJURY or DEATH may result if personnel fail to observe safety pr
40. igh Limit 600 100 650 36 8 Digital Communication Interface Interface Commands 9141 communication commands continued Command Command Returned Acceptable Command Description Format Example Returned Example Values Serial Interface Menu Read serial sample setting sa mple sa sa 9 sa 1 Set serial sampling setting ton salmple n sa 0 0 to 999 seconds Set serial duplex mode du plex f ull h alf FULL or HALF Set serial duplex mode to full du plex f ull du f Set serial duplex mode to half du plex h alf du h Set serial linefeed mode If eed on of f ON or OFF Set serial linefeed mode to on Iffeed on If on Set serial linefeed mode to off If eed offf If of Miscellaneous Read firmware version number ver sion ver ver 9999 9 99 ver 9141 1 21 Read structure of all commands h elp h list of commands Read ALL operating parameters all all list of parameters Legend Optional Command data Returns either information n Numeric data supplied by user 9 Numeric data returned to user x Character data returned to user Note When DUPLEX is set to FULL and a command is sent to READ the command is returned followed by a carriage return and linefeed Then the value is returned as indicated in the RETURNED column 37 9 Test Probe Calibration Calibrating a Single Probe 9 1 9 2 1 9 2 2 Test Probe Calibration For optimum accuracy and stability allow the
41. int is changed For example if the switch is currently open when the set point is changed the closed position then becomes the new active position The normal position is set automatically under any of the following conditions 1 a new set point number is selected 2 the set point value is changed 3 a new set point is set through the communications channels The operating mode of the temperature hold is set in the primary menu after the scan rate setting Switch Wiring The thermal switch or cutout is wired to the calibrator at the two terminals in the front of the dry well calibrator labeled SWITCH HOLD The switch wires may be connected to the terminals either way Internally the black termi nal connects to ground The red terminal connects to 5V through 100 re 25 9141 Dry well Calibrator User s Guide 26 7 4 4 7 5 7 6 sistor The calibrator measures the voltage at the red terminal and interprets 5V as open and as closed Switch Test Example This section describes a possible application for the temperature hold feature and how the instrument is set up and operated Suppose you have a thermal switch which is supposed to open at about 75 C and close at about 50 C and you want to test the switch to see how accurate and repeatable it is You can use the temperature hold feature and the scan function to test the switch Measurements can be made by observing the display or pref erably by
42. ion commands continued 37 Typical Heating Rate s seors oeg as eR ERS eR oW 41 Typical Cooling Rates 1 2 41 1 Before You Start Symbols Used 1 1 Before You Start Symbols Used Table 1 lists the International Electrical Symbols Some or all of these symbols may be used on the instrument or in this manual Table 1 International Electrical Symbols Symbol Description N AC Alternating Current NL AC DC Battery N CE Complies with European Union Directives DC Double Insulated Electric Shock Fuse PE Ground Hot Surface Burn Hazard Read the User s Manual Important Information Off On O l gt o 9141 Dry well Calibrator User s Guide Symbol Description Canadian Standards Association 5 OVERVOLTAGE Installation CATEGORY II Pollution Degree 2 per IEC1010 1 CATE fers to the level of Impulse Withstand Voltage protection provided Equipment of OVERVOLTAGE CATEGORY II is energy consuming equipment to be supplied from the fixed installation Examples include household office and laboratory appliances C TIC Australian Mark Y The European Waste Electrical and Electronic Equipment WEEE Directive 2002 96 EC mark mmm 1 2 Safety Information Use this instrument only as specified in this manual Otherwise the protection provided by the instrument may be impaired The following definitions apply to the
43. nd en Access heater power in secondary menu E SEL Flashes SEC for secondary menu and then displays the ii ue dower 2 0 P Heater power in percent SET Access proportional band ul Proportional band setting PreP Flashes Pr oP and then displays the value To accept the new setting press SET Press EXIT to continue without stor ing the new value SET Accept the new proportional band setting Controller Configuration The controller has a number of configuration and operating options and calibra tion parameters which are programmable via the front panel These are ac cessed from the secondary menu after the proportional band function by pressing SET Pressing SET again enters the first of three sets of configu ration parameters calibration parameters operating parameters and serial in terface parameters The sets are selected using the UP and DOWN keys and then pressing SET See Figure 5 on page 22 Calibration Parameters The operator of the instrument controller has access to a number of the calibra tion constants namely RO ALPHA and DELTA These values are set at the factory and must not be altered The correct values are important to the accu racy and proper and safe operation of the instrument Access to these parame ters 15 available to the user so that in the event that the controller memory fails 7 Controller Operation Operating Parameters the user may restore these
44. nds The various commands for accessing the calibrator functions via the digital in terfaces are listed in this section see Table 2 These commands are used with the RS 232 serial interface The commands are terminated with a carriage re turn character The interface makes no distinction between upper and lower case letters hence either may be used Commands may be abbreviated to the minimum number of letters which determines a unique command A command may be used to either set a parameter or display a parameter depending on whether or not a value is sent with the command following a character For example s lt CR gt returns the current set point and s 150 0 lt CR gt sets the set point to 150 0 degrees In the following list of commands characters or data within brackets and are optional for the command A slash denotes alternate characters or data Numeric data denoted by may be entered in decimal or exponential notation Characters are shown in lower case although upper case may be used Spaces may be added within command strings and will simply be ignored Backspace BS ASCII 8 may be used to erase the previous character A termi nating CR is implied with all commands 35 9141 Dry well Calibrator User s Guide Table 2 9141 controller communications commands Command Command Returne
45. ng 39 9 2 2 Stabilization and 39 10 Calibration Procedure 43 10 1 Calibration 43 10 2 43 10 2 1 Compute DELTAS vu ge qoe Me RE eee ae 43 10 2 2 Compute R amp ALPHA 25 22 55 USES ES 44 10 2 3 Accuracy amp Repeatability ss ema sammis trka 45 11 Maintenance 47 12 Troubleshooting 49 12 1 Troubleshooting Problems Possible Causes and Solutions 49 122 RE CODES x ws amp ere ARA 50 12 2 1 EMC Directive ae g 2 2 00 RR mr RES 50 12 2 2 Low Voltage Directive Safety ss cs roc o o 51 iii Figures Tables Table 1 Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Table 2 Table 2 Figure 7 Figure 8 International Electrical Symbols 1 Heat shield installed on 914 1calibrator 5 9141 Back Panel and Bottom 15 9141 Front Panel 2 6 4 we vieran XO HUE ec here 16 Inserts available for the 9141 block assembly 17 Controller Operation Flowchart 22 Seral Gable WICIBE uv sa ue AA Re 33 9141 controller communications commands 36 9141 communicat
46. normal operation If the unit fails to operate please check the power connection 13 9141 Dry well Calibrator User s Guide 14 4 3 4 4 The display will begin to show the well temperature and the well heater will start operating to bring the temperature of the well to the set point temperature Power Plug the dry well power cord into a mains outlet of the proper voltage fre quency and current capability Typically this will be 115 VAC 10 50 60 Hz 230 VAC 1096 50 60 Hz Turn the dry well on using the rear panel POWER switch The dry well will turn on and begin to heat to the previously programmed temperature set point The front panel LED display will indicate the actual dry well temperature Setting the Temperature Section 7 2 explains in detail how to set the temperature set point on the cali brator using the front panel keys The procedure is summarized here 1 Press SET twice to access the set point value 2 Press UP or DOWN to change the set point value 3 Press SET to store the new set point 4 Press EXIT to return to the temperature display When the set point temperature is changed the controller will switch the well heater on or off to raise or lower the temperature The displayed well tempera ture will gradually change until it reaches the set point temperature The well may require 5 to 10 minutes to reach the set point depending on the span An other 5
47. per Wiring Use a wall plug tester to check the main power plug at the wall Power Cord Check the cord for continuity on the ground prongs If the resistance is greater than one ohm replace it Dielectric Test Use an ohmmeter to check the continuity between the ground prong on the PEM and the insert If the resistance reading is greater then three ohms contact a Hart Scientific Authorized Service Center for assistance Power up Fuse The unit is equipped with external operator accessible fuses If a fuse blows it may be due to a power surge or failure of a component Replace the fuse once DO NOT replace the fuse with one of a higher current rating Always replace the fuse with one of the same rating voltage and type If the fuse blows a second time it is likely caused by failure of a component part Contact a Hart Scientific Autho rized Service Center Section 1 3 for assistance CE Comments EMC Directive Hart Scientific s equipment has been tested to meet the European Electromag netic Compatibility Directive EMC Directive 89 336 EEC The Declaration of Conformity for your instrument lists the specific standards to which the unit was tested 12 Troubleshooting CE Comments 12 2 2 Low Voltage Directive Safety In order to comply with the European Low Voltage Directive 73 23 EEC Hart Scientific equipment has been designed to meet the IEC 1010 1 EN 61010 1 and the IEC 1010 2 010 EN 61010 2 010 stan
48. perature and resistance at 50 0 C T and are the measured temperature and resistance at 250 0 C and R the measured temperature and resistance at 450 0 C 10 2 2 Compute R amp ALPHA a T deta a T dena 5 2 rzero 30i fs a a R R alpha R a delta is the new value of DELTA computed above 5 Program the new values for DELTA delta R rzero and ALPHA alpha into the dry well with the following steps a Press SET and EXIT keys at the same time and then press SET until R is displayed 44 10 Calibration Procedure Calibration Procedure 10 2 3 b Press SET then use the UP or DOWN keys until the correct numerical setting is displayed Press SET to accept the new value c Repeat step b for ALPHA and DELTA Accuracy amp Repeatability 1 Check the accuracy of the dry well at various points over the calibrated range 2 If dry well does not pass specification at all set points repeat the Calibra tion Procedure 45 11 Maintenance 11 Maintenance e The calibration instrument has been designed with the utmost care Ease of operation and simplicity of maintenance have been a central theme in the product development Therefore with proper care the instrument should require very little maintenance Avoid operating the instrument in an oily wet dirty or dusty environment e If the outside of the instrument becomes soil
49. plex any commands received by the calibrator via the serial interface are immediately echoed or transmitted back to the device of origin With half duplex the commands are executed but not echoed The du plex mode parameter is indicated by dUPL i Serial duplex mode parameter Linefeed The final parameter in the serial interface menu is the linefeed mode This pa rameter enables on or disables off transmission of a linefeed character LF 31 9141 Dry well Calibrator User s Guide 32 ASCII 10 after transmission of any carriage return The linefeed parameter is indicated by 8 Digital Communication Interface Serial Communications 8 1 8 1 1 Digital Communication Interface The dry well calibrator is capable of communicating with and being controlled by other equipment through the digital serial interface With a digital interface the instrument may be connected to a computer or other equipment This allows the user to set the set point temperature monitor the temperature and access any of the other controller functions all using remote communications equipment Communications commands are summarized in Table 2 on page 36 Serial Communications The calibrator is installed with an RS 232 serial interface that allows serial dig ital communications over fairly long distances With the serial interface the user may access any of the functions parameters and settings discussed in Section with the exception o
50. rated to provide cooling for the instrument It has two speeds a slow speed for control operation and a faster speed for rapid cooling Slots at the top and around the two corners of the calibrator are provided for airflow The area around the calibrator must be kept clear to allow adequate ventilation The air flow is directed upward and can be extremely hot 9141 DRY WELL CALIBRATOR 50 C to 650 C Calibration SWITCH vs 229 DOWN UP Figure 3 9141 Front Panel Front Panel 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 vari ous calibrator functions settings and constants The display shows tempera tures in units according to the selected scale C or F 5 Parts and Controls Constant Temperature Block Assembly Controller Keypad The four button keypad allows easy setting of the set point temperature The control buttons SET DOWN UP and EXIT are used to set the calibrator temperature set point access and set other operating parameters and access and set calibration parameters Setting the control temperature is done directly in degrees of the current scale It can be set to one tenth of a degree Celsius or Fahrenheit The functions of the buttons are as follows SET Used to display the next parameter in the menu and to store parameters to the displayed value DOWN
51. s 0 Thus as the temperature rises the heater power is reduced which consequently tends to lower the temperature back down In this way the temperature is maintained at a fairly constant temperature The temperature stability of the well and response time depend on the width of the proportional band If the band is too wide the well temperature will deviate excessively from the set point due to varying external conditions This is be cause the power output changes very little with temperature and the controller cannot respond very well to changing conditions or noise in the system If the proportional band is too narrow the temperature may swing back and forth be cause the controller overreacts to temperature variations For best control stabil ity the proportional band must be set for the optimum width The proportional band width is set at the factory to about 15 0 C The propor tional band width may be altered by the user if he desires to optimize the con trol characteristics for a particular application The proportional band width is easily adjusted from the front panel The width may be set to discrete values in degrees C or F depending on the selected units The proportional band adjustment is be accessed within the secondary menu 27 9141 Dry well Calibrator User s Guide 28 7 8 7 9 Press SET and EXIT to enter the secondary menu and show the heater power Then press SET to access the proportional ba
52. sleeves Probe sleeves of various hole sizes are available to allow the user s probe to fit snugly into the well whatever the diameter of the probe One insert whichever is ordered is shipped with the unit e Insert A variety block 1 2 3 8 3 16 1 8 and 1 16 holes e Insert B comparison block two 3 8 two 1 4 and two 3 16 holes e Insert C 1 4 comparison block six 1 4 holes or e Insert D metric block two 3 mm two 4 mm and two 6 mm holes 6 General Operation Changing Display Units 6 1 6 2 General Operation Changing Display Units The 9141 can display temperature in Celsius or Fahrenheit The temperature units are shipped from the factory set to Celsius To change to Fahrenheit or back to Celsius there are two ways 1 Press the SET and UP simultaneously This will change display units 2 Press the SET key three times from the temperature display to show Press the UP or Down key to change units Press SET to store changes Switching to 230V Operation The 9141 is switchable from 115 VAC to 230 VAC 50 60 Hz Switching the voltage can change the calibration so the unit should be calibrated after changing the input voltage To change from 115 VAC to 230 VAC e Unplug the unit e Lay the unit down on its side e With a small straight slot screwdriver remove the fuse holder located on the rear panel Replace the two fuses 10 amp 250 V with 5 amp 25
53. ture of the well by pulsing the heater on and off The total power being applied to the heater is determined by the duty cycle or the ratio of heater on time to the pulse cycle time By knowing the amount of heating the user can tell if the calibrator is heating up to the set point cooling down or controlling at a constant temperature Monitoring 7 Controller Operation Proportional Band 7 7 the percent heater power will let the user know how stable the well temperature is With good control stability the percent heating power should not fluctuate more than 1 within one minute The heater power display is accessed in the secondary menu Press SET and EXIT simultaneously and release The heater power will be displayed as a percentage of full power 190 0 C i Well temperature ex Access heater power in secondary menu SEL Flashes SEC for secondary menu and then displays the ee ee dienen or 12 0 i 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 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 i
54. urrent baud rate value will then be displayed 2400 b i Current baud rate The baud rate of the serial communications may be programmed to 300 600 1200 2400 4800 or 9600 baud Use UP or DOWN to change the baud rate value 4800 b i New baud rate 7 Controller Operation Serial Interface Parameters 7 11 2 7 11 3 7 11 4 Press SET to set the baud rate to the new value or EXIT to abort the tion and skip to the next parameter in the menu Sample Period The sample period is the next parameter in the serial interface parameter menu The sample period is the time period in seconds between temperature measure ments transmitted from the serial interface If the sample rate is set to 5 the in strument transmits the current measurement over the serial interface approximately every five seconds The automatic sampling is disabled with a sample period of 0 The sample period is indicated by Serial sample period parameter Press SET to choose to set the sample period The current sample period value will be displayed Press EXIT to exit without saving the changes i Current sample period seconds Adjust the value with UP or DOWN and then use SET to set the sample rate to the displayed value SP 60 New sample period Duplex Mode The next parameter is the duplex mode The duplex mode may be set to full du plex or half duplex With full du
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