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1. Cooling F Temperature mI Back Pressure Low High With Interface optional lt lt O O O Figure 3 Refrigeration Side Panel Controls 1 The back pressure valve adjustment is used to control the amount of cooling supplied to the system This valve reduces the cooling capacity by restricting the flow of refrigerant to the bath allowing the adjustment of the heating to cooling percentage Under normal operation the valve should be fully open counter clockwise 7 Parts and Controls Back Panel 7 3 2 The cooling temperature regulating valve is used to adjust the tempera ture at which the refrigerant evaporates which determines cooling effi ciency Refer to the label below the gauge for approximate psi and evaporative temperature settings The following table is reproduced from the label For this bath Set the Cooling Temp Control Temperature Valve to this pressure Nominal Cooling PSIG DO NOT set the Cooling Pressure above 90 PSIG 3 The cooling temp gauge is used to indicate the pressure at which the evaporating temperature is adequate the cooling temp regulating valve is used to adjust and then control this temperature Interpolate for tempera tures in between those shown Back Panel The back panel has six standard features and two optional features see Figure 4 1 the probe connector 2 the stirrer power outlet
2. UP DOWN Reset Mode EXIT SET SET RO SET Adj RO ig SET EXIT ALPHA Adj Cutout Reset Mode SET EXIT SET EXIT Adj ALPHA SET EXIT T IEEE 488 Interface Adjust BAUD Rate I SET EXIT SET EXIT Y Linefeed j SET EXIT gt SET EXIT Interface Option Installed EXIT El s DOWN Menu lt _ SET SET Device Address ue SET EXIT gt SET Calibration Adj Device EXIT 5 Adjust CTO Address SET EXIT SETIEXIT IEEE 488 Option Installed SET m x IT Adjust BO SET EXIT y SET d m E T Adjust BG g DO NOT CHANGE THESE VALUES SEE MANUAL Ci SET EXIT I SET m x IT f I SET EXIT y m x EI gt Adjust L SET EXIT 9 Controller Operation Temperature Set point
3. 22 Back Panel 2 10 cit ea se de 24 Drain Location and LidOptions o o 26 Table of various bath fluids and their properties 31 Chart of various bath fluids and their properties 32 Controller Operation Flow Chart o 38 Bath temperature fluctuation at various proportional band settings 43 Proportional Band Fluid Table llle 43 serial Cable Witte vs 59 gut PRESSE eee vs 51 Interface Command Summary 00 54 Interface Command Summary continued sss 55 Interface Command Summary continued sn 56 Serial Power Control Functions o 27 Remote Operation Ranges and Settings o 58 Calibration Example Ee e 61 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 NU AC Alternating Current ING AC DC Battery Mm P 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 ObP gt I eo 7037 7038 7040 7041 Calibration Bath User s Guide 1 2 1 2 1 Symbol Description amp Cana
4. e ambient temperature range 5 50 C 41 122 F e ambient relative humidity maximum 80 for temperature lt 31 C de creasing linearly to 50 at 40 C e pressure 75kPa 106kPa e mains voltage within 10 of nominal e vibrations in the calibration environment should be minimized e altitude less than 2 000 meters e indoor use only 4 Quick Start Unpacking 4 4 1 4 2 Quick Start A CAUTION READ SECTION 6 ENTITLED BATH USE before placing the bath in service Incorrect handling can damage the bath and void the warranty This section gives a brief summary of the steps required to set up and operate the bath This should be used as a general overview and reference and not as a substitute for the remainder of the manual Please read Sections 5 through 8 carefully before operating the bath Unpacking Unpack the bath 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 all components are present e 7037 7038 7040 7041 Bath e Controller Probe e Access Hole Cover e User s Guide e Report of Test e Drain Elbow If you are missing any item please contact an Authorized Service Center Set Up Set up of the bath requires careful unpacking and placement of the bath filling the bath with fluid installing the probe and connecting power Consult Section 5 for detailed instructions for proper ins
5. Hart Scientific 9 7037 7038 7040 7041 Calibration Bath User s Guide Rev 771701 Rev 771701 Limited Warranty Limitation of Liability Each product from Fluke Corporation Hart Scientific Division Hart is warranted to be free from de fects in material and workmanship under normal use and service The warranty period is one year for the Calibration Bath The warranty period begins on the date of the shipment Parts product repairs and ser vices are warranted for 90 days The warranty extends only to the original buyer or end user customer of a Hart authorized reseller and does not apply to fuses disposable batteries or to any other product which in Hart s opinion has been misused altered neglected or damaged by accident or abnormal conditions of operation or handling Hart warrants that software will operate substantially in accordance with its functional specifications for 90 days and that it has been properly recorded on non defective media Hart does not warrant that software will be error free or operate without interruption Hart does not warrant calibrations on the Calibration Bath Hart 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 Hart Warranty support is available if product is purchased through a Hart authorized sales outlet or Buyer has paid the applicable international price H
6. 25 C 0 66 0 C 0 792 20 C 0 45 20 C Water 0 C fr 95 C b NONE 1 25 C 1 00 1 00 0 0014 0 0002 25 C 0 4 75 C Ethylene 35 C fr 110 C b NONE 7 0 C 1 05 0 8 0 C 0 001 Glycol 50 2 50 C 5020 0 7 100 C Mineral Oil 40 C v 190 C fl 190 C 150 75 C 0 87 25 C 0 48 25 C 0 00025 25 C 0 0007 50 C 5 25 C 5 125 C 0 84 75 C 0 53 75 C 0 81 125 C 0 57 125 C Dow Corning 40 C v 133 C fl cc 133 C 5 25 C 0 92 25 C 0 4 0 00028 25 C 0 00105 1000 25 C 200 5 10 150 C Silicone Oil Dow Corning 35 C v 165 C fl cc 165 C 100 25 C 0 934 25 C 0 43 40 C 0 00032 25 C 0 00108 1000 25 C 200 10 3 135 C 0 45 100 C 50 150 C 5012 0 482 200 C Dow Corning 7 C v 230 C fl cc 230 C 200 25 C 0 949 25 C 0 370 40 C 0 00034 25 C 0 00107 1000 25 C 200 20 0 393 100 C 50 150 C 5013 0 420 200 C Dow Corning 25 C v 280 C fl cc 280 C 200 25 C 0 96 25 C 0 4 0 00037 25 C 0 00104 1000 25 C 200 50 50 150 C Silicone Oil Dow Corning 550 70 C v 232 C fl cc 232 C 50 70 C 1 07 25 C 0 358 40 C 0 00035 25 C 0 00075 100 25 C 5016 300 C fl oc 10 104 C 0 386 100 C 1 150 C 0 433 200 C Dow Corning 710 80 C v 302 C fl oc 302 C 50 80 C 1 11 25 C 0 363 40 C 0 00035 25 C 0 00077 100 25 C 7 204 C 0 454 100 C 1 150 C 5017 0 505 200 C Dow Corning
7. INCIDENTAL OR CONSE QUENTIAL DAMAGES OR LOSSES INCLUDING LOSS OF DATA WHETHER ARISING FROM BREACH OF WARRANTY OR BASED ON CONTRACT TORT RELIANCE OR ANY OTHER 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 of com petent jurisdiction such holding will not affect the validity or enforceability of any other provision Fluke Corporation Hart Scientific Division 799 E Utah Valley Drive e American Fork UT 84003 9775 USA Phone 1 801 763 1600 Telefax 1 801 763 1010 E mail support hartscientific com www hartscientific com Subject to change without notice e Copyright O 2006 Printed in USA Table of Contents 1 Before You Start 1l Ll SymbolsUsed pre ssh 2 254644 RE eRe XR 1 1 2 Safety Information o o o 2 1 2 1 WARNINGS c e race acea do a A a S S 2 1 2 2 CAUTIONS 5 ion a eR e DR UR C RHET C Rp UR it 4 13 Authorized Service Centers a eae a a 5 2 Introduction 9 3 Specifications and Warranty 11 3 1 Specifications uo x noe e hg E E ok Re ke E ox aS 11 3 2 Environmental Conditions less 12 4 Quick SUI uuo goa o vox eee x DECR RR oe
8. 66 C v 315 C fl oc 315 C 500 66 C 0 96 25 C 0 34 100 C 0 0003 0 00095 100 25 C 210 H 14 204 C 10 150 C Silicone Oil Heat Transfer 145 C fr 530 C NONE 34 150 C 2 0 150 C 0 33 0 0014 0 00041 1 7 Q lom Salt 6 5 300 C 1 9 300 C 5001 2 4 500 C 1 7 500 C Limiting Factors b boiling point e high evaporation fl flash point fr freeze point v viscosity Flash point test oc open cup cc closed cup Very low water solubility ice will form as a slush from condensation below freezing Freezing Point The freezing point of a fluid is an obvious limitation to stir ring As the freezing point is approached high viscosity may also limit good stirring Pour Point This represents a handling limit for the fluid Viscosity Points shown are at 50 and 10 centistokes Greater than 50 centi stokes stirring is very poor and unsatisfactory for bath applications At 10 31 7037 7038 7040 7041 Calibration Bath User s Guide 100 C 100 C 200 C 300 C 400 C ore FL 302 C ye Sa FL 280 C Silicone Oil Ane 10cs FL 232 C AAA EE Silicone Oil E 5012 m FL211 C Silicone Oil i ESL mn FL 133 C HFE 7500 5023 Halocarbon 5019 Mineral Oil 5011 Water FR BP Methanol PITO FL 12 C BP Ethanol Ethylene Glycol 50 50 with H20 2i Dynalene HF LO 5022 Bath
9. 9 3 9 3 1 rESEE P i cutout reset function Press SET once more to reset the cutout SET Reset cutout The display is also switched to the set temperature function To return to dis playing the temperature press the EXIT button If the cutout is still in the over temperature fault condition the display continues to flash Eut out The bath temperature must drop a few degrees below the cutout set point be fore the cutout can be reset Temperature Set point The bath temperature can be set to any value within the range and with resolu tion as given in the specifications The temperature range of the particular fluid used in the bath must be known by the operator and the bath should only be op erated well below the upper temperature limit of the liquid In addition the cut out temperature should also be set below the upper limit of the fluid Setting the bath temperature involves three steps 1 select the set point mem ory 2 adjust the set point value and 3 adjust the vernier if desired Programmable Set points The controller stores 8 set point temperatures in memory The set points can be quickly recalled to conveniently set the bath to a previously programmed tem perature set point To set the bath 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 show
10. Carefully place probes on a heat cold resistant surface or rack until they are at room temperature It is advisable to wipe the probe with a clean soft cloth or paper towel before inserting it into another bath This prevents the mixing of fluids from one bath to another If the probe has been calibrated in liquid salt carefully wash the probe in warm water and dry completely before transferring it to another fluid Always be sure that the probe is completely dry before in serting it into a hot fluid Some of the high temperature fluids react violently to water or other liquid mediums Be aware that cleaning the probe can be danger ous if the probe has not cooled to room temperature Additionally high temper ature fluids may ignite the paper towels if the probe has not been cooled For optimum accuracy and stability allow the bath adequate stabilization time after reaching the set point temperature Comparison Calibration Comparison calibration involves testing a probe unit under test UUT against a reference probe After inserting the probes to be calibrated into the bath al low sufficient time for the probes to settle and the temperature of the bath to stabilize One of the significant dividends of using a bath rather than a dry well to cali brate multiple probes is that the probes do not need to be identical in construc tion The fluid in the bath allows different types of probes to be calibrated at the same time However stem effe
11. Hart Scientific s equipment has been tested to meet the European Electromag netic Compatibility Directive EMC Directive 89 336 EEC Selection of Light Industrial of Heavy Industrial compliance has been based on the intended use of the instrument Units designed for use in a calibration laboratory have been tested to Light Industrial Standards Units designed to be used in the field have been tested to both Light Industrial and Heavy Industrial Standards The 67 7037 7038 7040 7041 Calibration Bath User s Guide Declaration of Conformity for your instrument lists the specific standards to which the unit was tested 13 2 2 Low Voltage Directive Safety 68 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
12. Rog ds A 52 101 3 Serial OPEratiOM racs a eaa Hay mea Hae ee ee Se ey ad 52 10 2 IEEE 488 Communication optional 33 10 1 Setup a g ae Se EW e SS Soe Eee SEN Gu s 53 10 2 1 1 IEEE 488 Interface Address s a 2 e e aa ea ee 33 10 2 2 gt IBEE 488 Operation s m sets a a a ed a Ue s 53 10 3 InterfaceCommands e 53 10 4 Power Control Functions lll 56 10 4 1 Heater Control sca sos eek ee ae ew a RP we we E oen 57 104 2 Cooling Control worst ee Re Re a a ek OEGS 57 10 4 8 Full RemoteOperation 2 ee ces 58 11 Calibration Procedure 59 11 1 Calibration Points 2 2 lees 59 11 2 Measuring the Set point Error 2 2 a 59 11 3 Computing R and ALPHA 59 11 4 Calibration Example o llle 60 12 Maintenance 63 13 Troubleshooting 6 4 m onm o mr 65 13 1 Troubleshooting een 65 13 2 COMMENS gt scu ER a a Wo Rey 67 15 23 EMCIDIEGUVO o ouem Salas Bike dues BBs 8 eae desc eius 67 13 2 2 Low Voltage Directive Safety s s a llle 68 lii Figures and Tables Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Table 2 Figure 6 Figure 7 Figure 8 Table 3 Figure 9 Table 4 Table 4 Table 4 Table 5 Table 6 Figure 10 Bath Assembly lt ceas 405 0486 sosa oy E 9 Front Panel soo 2 hie boues aes mb x SO ROS E RO SD Wo 21 Refrigeration Side Panel Controls o o
13. access hole to a level that will allow for stirring and thermal expansion The fluid should never exceed a height of 12 7 mm 1 2 inch below the top of the tank Carefully monitor the bath fluid level as the bath temperature rises to prevent overflow or splashing Remove excess fluid if necessary and with caution if the fluid is hot Be careful to prevent bath fluid from spilling on the stirring motor while filling CAUTION Underfilling may reduce bath performance and may possibly damage the bath heater Probe Inspect the bath controller probe This probe should not be bent or damaged in any way Reasonable caution should be used in handling this probe as it con tains a precision platinum sensor and is mechanically shock sensitive Drop ping striking or other physical shock may cause a shift in resistance in the probe resulting in diminished bath accuracy If damaged the probe can be re placed by contacting an Authorized Service Center for assistance Insert the probe into the 6 35 mm 1 4 inch probe hole at the top left side of the bath lid The tip of the probe must be well immersed in the fluid The probe connector is plugged into the rear of the bath into the socket labeled PROBE Power With the bath power switch off plug the bath into an AC mains outlet of the appropriate voltage frequency and current capacity see Section 3 1 Specifi cations Refer to and read the CAUTION at the front of the manual concerning bro
14. bath reaches a measured temperature of 0 3 C then the error is 0 3 C Next set the bath for the upper set point ty and after stabilizing measure the bath temperature and compute the error errg For this example we will suppose the bath was set for 100 C and the thermometer measured 100 1 C giving an error of 0 1 C Computing R and ALPHA Before computing the new values for Ry and ALPHA the current values must be known The values may be found by either accessing the probe calibration 59 7037 7038 7040 7041 Calibration Bath User s Guide 60 11 4 menu from the controller panel or by inquiring through the digital interface The user should keep a record of these values in case they may need to be re stored in the future The new values Ry and ALPHA are computed by enter ing the old values for Ry and ALPHA the calibration temperature set points ty and ty and the temperature errors err and erry into the following equations lyut RY Es I e In ALPHA 41 R 1 ALPHA t err 1 ALPHA t err ty t 1 ALPHA ALPHA l If for example Ry and ALPHA were previously set for 100 000 and 0 0038500 respectively and the data for ty ty erry and erry were as given above then the new values Ry and ALPHA would be computed as 99 885 and 0 0038302 re spectively Program the new values Ry and ALPHA into the controller Check the calibration by setting the temperature to tj and ty and me
15. been incorporated which maintains the bath temperature with extreme sta bility The controller uses a microcontroller to execute the many operating functions User interface is provided by the 8 digit LED display and four key switches Digital remote communications is optionally available with a RS 232 or IEEE 488 interface There are two lids available for the 7037 and 7040 baths the standard lid with a rectangular access hole and an optional lid with a recirculation pump see Fig ure 5 1 Hah yon 1 it HES x LUE 1 Ug ue 1 at itt 1 y ee 1 ES Y XR 1 tit rie 1 s el UR n E 1 Het ADR 1 es E 1 A Figure 1 Bath Assembly 3 Specifications and Warranty Specifications 3 1 Specifications and Warranty Specifications Specifications Operating Range 40 C to 110 C 10 C to 110 C 40 C to 110 C Stability 0 002 C at 40 C ethanol 0 0015 C at 25 C water 0 003 C at 100 C oil 5012 Uniformity 0 004 C at 40 C ethanol 0 002 C at 25 C water 0 004 C at 100 C oil 5012 Temperature Setting Digital display with push button data entry Set Point Resolution 0 01 C high resolution mode 0 00007 C Display Resolution 0 01 C Digital Setting 1 0 C Accuracy Digital Setting 0 01 C Repeatability Heater Power 500 and 1000 Watts Power 115 VAC 410 60 Hz 2000 W 230 VAC 10 60 Hz 2
16. button or display reading are to the right of each button or display value To view or set the bath temperature set point proceed as follows The front panel LED display normally shows the actual bath temperature e4 68 Bath temperature display A O When SET is pressed the display shows the set point memory that is cur rently being used and its value Eight set point memories are available SET Access set point selection i 25 0 j Set point 1 25 0 C currently used O O Press SET to select this memory and access the set point value SET Access set point value C 25 08 Current value of set point 1 25 00 C O Press UP or DOWN to change the set point value Increment display C 30 00 New set point value 4 Quick Start Setting the Temperature Press SET to accept the new value and display the vernier value The bath be gins heating or cooling to the new set point SET Store new set point access vernier 0 00000 Current vernier value Press EXIT and the bath temperature will be displayed again fex Return to the temperature display e4 13 E Bath temperature display The bath heats or cools until it reaches the new set point temperature Set the heater switch to position HIGH to allow the bath to more quickly reach a higher temperature The HIGH setting may be necessary to reach higher tem peratures and control at high temperatures When setting the set poi
17. 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 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 suvesdabeabiciacastaastasauesesene 9 Controller Operation IEEE 488 Parameters 9 13 9 13 1 9 14 IEEE 488 Parameters Baths may optionally be fitted with an IEEE 488 GPIB interface In this case the user may set the interface address within the IEEE 488 parameter menu This menu does not appear on baths not fitted with the interface The menu is indicated by IEEE IEEE 488 parameters menu Press SET to enter the menu 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 Add Pe 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 E New IEEE 488 interface address Calibration Parameters The operator of the bath controller has access to a number of the bath calibra tion constants namely CTO BO BG H and L These values are set at the fac tory and must not be altered The correct values are im
18. out of range indicator is on red when the line voltage is low See the Warnings in Section 1 2 for details Bath Tank and Lid There are two different types of lids They both have the same overall dimen sions but the optional lid see Figure 5 has a recirculation pump and the stan dard lid has a stirring motor with rectangular access hole Their features are described with reference to figure numbers as follows 1 The top half of the latch attaches the lid to the bath There are two latches one on the front and one on the back 2 The thermometer liquid level is a hole in the lid for filling and removing of liquid checking liquid level and for mounting a thermometer A hole may be drilled in the rubber stopper supplied for inserting a thermometer into the bath 3 The rectangular access hole standard lid may be used to insert the users device to be thermostatted To obtain specified control levels this hole must be covered to prevent thermal disturbance to the bath Covers may be purchased separately from Hart Scientific 3 Thecirculation inlet outlet pump lid is the access area or the inlet and outlet for the circulation pump 4 The stirrer pump motor drives the stirring propeller to provide mixing of the bath fluid Proper mixing of the fluid is important for good constant temperature stability The stir motor power cord plugs into the back of the bath at the power socket labeled STIRRER 5 The probe hole is for
19. process temperature Normally the cutout disconnects power to the heater when the bath temperature exceeds the cutout set point causing the temperature to drop back down to a safe value If the cutout mode is set to AUTO the heater switches back on when the temperature drops If the mode is set to RESET the heater only comes on again when the temperature is reduced and the cutout is manually reset by the operator See Section 9 8 Check that the cut out set point is adjusted to 10 or 20 C above the maximum bath oper ating temperature and that the cutout mode is set as desired If the cutout activates when the bath temperature is well below the cutout set point or the cutout does not reset when the bath temperature drops and it is manually reset then the cutout circuitry may be faulty or the cutout thermocouple sensor may be faulty or disconnected Contact an Authorized Service Center for assistance 65 7037 7038 7040 7041 Calibration Bath User s Guide Problem Causes and Solutions The display flashes cutout and an incorrect process temperature The problem may be that the controller s voltmeter circuit is not func tioning properly A problem could exist with the memory back up bat tery If the battery voltage is insufficient to maintain the memory data may become scrambled causing problems A nearby large static dis charge may also affect data in memory The memory may be reset by holding th
20. the cutout resets itself as soon as the temperature is lowered below the cutout set point With manual reset mode the cutout must be reset by the operator after the temperature falls below the set point When the cutout is active and the cutout mode is set to manual reset the dis play flashes E ut out until the user resets the cutout To access the reset cut out function press the SET button SET Access cutout reset function The display will indicate the reset function 37 7037 7038 7040 7041 Calibration Bath User s Guide Figure 7 Controller Operation Flow Chart 38 Display Temperature Secondary Functions gt SET EXIT Y ER E a RETE Y CERIS EXIT 1 Display Power l I hi EXIT Reset Cutout SET j Y I Cutout Active SET MC 4 EXIT HH Set Proportional Band AA ces m I Y SET HK EXIT Select Setpoint Y SET EXIT 4 Set Cutout Temp I Y SET EXIT Adjust Setpoint I SET Y EXIT Adjust Vernier EXIT I SET lt lt EXIT Set Scale C F Configuration Menu A SET SET A EXIT EXIT LP gt Operating es S DOWN Parameters PE Menu SET y Cutout
21. the following steps need to be followed le 25 3 4 Set the temperature of the bath to 25 C Set the low cooling power to its maximum psi but no more than 90 psi When the bath stabilizes adjust the back pressure valve so that the duty cycle is about 8 Set the cooling power back to 2 psi You are now ready to control the bath remotely according to the ranges recom mended in the following table The suggested ranges overlap and are not abso lute values Table 6 Remote Operation Ranges and Settings High Cooling Valve Back Pressure Range Heater Refrigeration Valve 40 to 0 C Low On Off On 10 to 20 C Low On On On 10 to 40 C Low On On Off 40 to 110 C High Off Off Off 11 Calibration Procedure Calibration Points 11 11 1 11 2 11 3 Calibration Procedure In some instances the user may want to calibrate the bath to improve the tem perature set point accuracy Calibration is done by adjusting the controller probe calibration constants Ry and ALPHA so that the temperature of the bath as measured with a standard thermometer agrees more closely with the bath set point The thermometer used must be able to measure the bath fluid temper ature with higher accuracy than the desired accuracy of the bath By using a good thermometer and carefully following procedure the bath can be calibrated to an accuracy of better than 0 02 C over a range of 100 degrees Calibration Points In calibrating the bath
22. the front panel These are ac cessed from the secondary menu after the cutout 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 Probe Parameters The probe parameter menu is indicated by P ObE Probe parameters menu ii Press SET to enter the menu The probe parameters menu contains the pa rameters RO and ALPHA which characterize the resistance temperature rela 45 7037 7038 7040 7041 Calibration Bath User s Guide 46 9 10 1 9 10 2 9 11 9 11 1 tionship of the platinum control probe These parameters may be adjusted to improve the accuracy of the bath This procedure is explained in detail in Sec tion 11 The probe parameters are accessed by pressing SET after the name of the pa rameter 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 RO This probe parameter refers to the resistance of the control probe at 0 C Normally this is set for 100 000 ohms ALPHA This probe parameter refers t
23. to the viscosity of the fluid A significant change in the viscosity can indicate that the fluid is contaminated being used out side of its temperature limits contains ice particles or is close to a chemi cal breakdown Once data has been gathered a specific maintenance schedule can be outline for the instrument Refer to Section 8 General Op eration for more information about the different types of fluids used in calibration baths Depending on the cleanliness of the environment the internal parts parts behind the front cover only of the cold bath should be cleaned and or checked at least every month for dust and dirt Particular attention should be paid to the condensing coil fins The fins should be vacuumed or brushed free of dust and dirt on a regular basis Dust and dirt inhibit the operation of the condensing coil and thus compromise the performance and lifetime of the cooling system 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 MSDS sheets ap 63 7037 7038 7040 7041 Calibration Bath User s Guide 64 plicable to all fluids used in the baths should be kept in close proximity to the instrument If the mains supply cord becomes damaged replace it with a cord with the appropriate gauge wire for the current of the bath If there are any questions contact an
24. with the cooling temperature knob labeled LOW This should be adjusted for approximately 0 1 psi if the bath is to be used as low as 40 C The knob labeled HIGH controls the cooling temperature when the expansion valve is on This should be adjusted for approximately 65 psi These values are typical but may be adjusted as required for specific appli cations The low range must be set to a lower pressure temperature than the high range valve The F4 command controls the back pressure bypass valve When the valve is open the cooling capacity is significantly reduced Cooling capacity may need to be reduced at higher temperatures Adjust the back pressure valve manually with the bypass valve closed until the duty cycle at the desired bath temperature is within 10 30 This setting may be bypassed automatically by opening the bypass valve Table 5 summarizes the control functions for heating and cooling Table 5 Serial Power Control Functions Function Command 0 1 Heater F1 low high Refrigeration F2 off on Expansion valve F3 off on Back pressure F4 off on bypass 57 7037 7038 7040 7041 Calibration Bath User s Guide 58 10 4 3 Full Remote Operation The back pressure valve knob is used to control the cooling power of the bath at higher temperatures Normally it is enabled for manual operation and it is adjusted to its full counterclockwise range for maximum cooling power For full remote operation
25. 0 Legend Note Optional Command data Returns either information n Numeric data supplied by user 9 Numeric data returned to user x Character data returned to user When DUPLEX is set to FULL and a command is sent to READ the command is returned followed by a carriage return and linefeed Then the value is returned as indicated in the RETURNED column 10 4 56 the current set point and s 50 00 lt CR gt will set the set point to 50 00 degrees In the following list of commands characters or data within brackets and J 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 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 Power Control Functions The digital interface is capable of controlling the heating and cooling functions so that the bath can be remotely operated at any temperature within the range of the bath To allow the interface to control the heating and the cooling the front panel controls are disabled by 1 switching the heater switch to LOW and 2 switching the refrigeration switch to OFF Otherwise the interface would not be able to switch these functions off T
26. 000 W 230 VAC 10 50 Hz 2000 W A Note If voltage is outside 10 VAC the compressor may be damaged Check the back panel label for the correct voltage and frequency prior to energizing the instrument System Fuse 115 VAC 20 A 250 V slow blow 230 VAC 10 A 250 V slow blow Heater Fuse 115 VAC 10 A 250 V fast blow 230 VAC 6 A 250 V fast blow Work Area 45 7 x 29 2 x 16 2 cm 45 7 x 25 4 x 12 7 cm 30 5 x 25 4 x 12 7 cm 33 x 32 4 x 18 4 cm HxWxD 18 x 11 5 x 6 375 18 x 10 x 5 inches 12 x 10 x 5 inches 13 x 12 75 x 7 25 inches inches Tank Capacity 41 6 liters 11 gal 56 6 liters 14 9 gal 26 5 liters 7 gal 39 3 liters 10 4 gal Wetted Parts 304 stainless steel Exterior Dimensions HxWxD 77 5 X 76 8 x 48 3 cm 62 2 x 76 8 x 48 3 cm 30 5 x 30 25 x 19 inches 24 5 x 30 25 x 19 inches Weight 68 kg 150 lbs 63 5 kg 140 lbs Safety OVERVOLTAGE Installation CATEGORY II Pollution Degree 2 per IEC61010 1 11 7037 7038 7040 7041 Calibration Bath User s Guide 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
27. 1 C Eth Gly 50 35 0 C Low 0 05 C 0 001 C Eth Gly 50 60 0 C Low 0 05 C 0 001 C Eth Gly 50 100 0 C High 0 4 C 0 002 C Oil 5cs 35 0 C Low 0 1 C 0 003 C Oil 5cs 60 0 C Low 0 2 C 0 002 C Oil 5cs 100 C Low 0 2 C 0 003 C 43 7037 7038 7040 7041 Calibration Bath User s Guide 44 9 8 The proportional band adjustment may be accessed within the secondary menu Press SET and EXIT to enter the secondary menu and show the heater power Then al SET to access the proportional band e Access heater power in secondary menu Pb 0 060 ti New proportional band setting To accept the new setting and access the cutout set point press SET Pressing EXIT exits the secondary menu ignoring any changes just made to the pro portional band value SET Accept the new proportional band setting Cutout As a protection against software or hardware fault shorted heater triac or user error the bath is equipped with an adjustable heater cutout device that shuts off power to the heater if the bath temperature exceeds a set value This protects the heater and bath materials from excessive temperatures and most impor tantly protects the bath fluids from being heated beyond the safe operating temperature preventing hazardous vaporization breakdown or ignition of the liquid The cutout temperature is programmable by the operator from the front panel of the controller It must always be set belo
28. 3 the power cord 4 the drain valve 5 the serial number 6 the RS 232 inferface connector optional 7 the IEEE 488 interface connector optional and 8 the mains out of range 23 7037 7038 7040 7041 Calibration Bath User s Guide indicator The system fuses are 20 amps for 115 V operation and 10 amps for 230 V operation These fuses are internal e 7040 SM 932301 e 8 i d Figure 4 Back Panel 1 The probe connector in the back panel is used for the temperature con troller probe 2 The stirrer power is provided for the stirring motor 3 The power cord 4 Adrain valve is provided for ease of removing the fluid media from the bath Always use a container of adequate size to hold the FULL LOAD of fluid Some oils are more easily drained at higher temperatures See caution note in next section 24 7 Parts and Controls Bath Tank and Lid 7 4 5 The serial number is located on the upper right corner of the back panel The series is also stamped on this panel When consulting with an Au thorized Service Center use the model number and the serial number 6 If the bath is supplied with a serial RS 232 interface the interface cable is attached to the back of the bath at the connector labeled Serial Port 7 Tf the bath is supplied with a GPIB IEEE 488 interface the interface ca ble is attached to the back of the bath at the connector labeled IEEE 8 The mains
29. 620 C in Set cutout setting c utout n r eset Set cutout to n degrees c utout n c 500 Temperature Range Reset cutout now c utout r eset c r Read heater power po wer po po 9999 po 1 duty cycle Configuration Menu Probe Menu Read RO calibration parameter r 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 00370 to ton 00399 Operating Parameters Menu Read cutout mode cm ode cm cm XxXxX cm AUTO Set cutout mode cm ode r eset a uto RESET or AUTO Set cutout to be reset manually cm ode r eset cm r 54 10 Digital Communication Interface Interface Commands Interface Command Summary continued Command Command Returned Acceptable Command Description Format Example Returned Example Values Set cutout to be reset cm ode a uto cm a automatically Serial Interface Menu Read serial sample setting sa mple sa sa 9 sa 1 Set serial sampling setting ton sa mple n sa 0 0 to 4000 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 If eed on
30. Authorized Service Center for more information Before using any cleaning or decontamination method except those rec ommended by Hart users should check with an Authorized Service Cen ter to be sure that the proposed method will not damage the equipment If the instrument is used in a manner not in accordance with the equip ment design the operation of the bath may be impaired or safety hazards may arise The over temperature cutout should be checked every 6 months to see that it is working properly In order to check the user selected cutout follow the controller directions Section 9 2 for setting the cutout Both the man ual and the auto reset option of the cutout should be checked Set the bath temperature higher than the cutout Check to see if the display flashes cut out and the temperature is decreasing A WARNING When checking the over temperature cutout be sure that the temperature limits of the bath fluid are not exceeded Exceeding the tem perature limits of the bath fluid could cause harm to the operator lab and instrument 13 Troubleshooting Troubleshooting 13 13 1 Troubleshooting This section contains information on troubleshooting and CE Comments Troubleshooting 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 re
31. EEE 488 interface first connect an IEEE 488 standard cable to the back of the bath Next set the device address This parameter is programmed within the IEEE 488 interface menu To enter the IEEE 488 parameter programming menu first press EXIT while pressing SET and release to enter the secondary menu Press SET repeat edly until the display reaches Pr Gb E This is the menu selection Press UP repeatedly until the IEBE 488 interface menu is indicated with IE E E Press SET to enter the IEEE 488 parameter menu The IEEE 488 menu contains the IEEE 488 address parameter IEEE 488 Interface Address The IEEE 488 address is prompted with Addr E55 Press SET to program the address The default address is 22 Change the device address of the bath if necessary to match the address used by the communication equipment by pressing UP or DOWN and then SET IEEE 488 Operation Commands may now be sent via the IEEE 488 interface to read or set the tem perature or access other controller functions All commands are ASCII charac ter strings and are terminated with a carriage return CR ASCII 13 Interface commands are listed below Interface Commands The various commands for accessing the bath controller functions via the digi tal interfaces are listed in this section see Table 4 These commands are used with both the RS 232 serial interface and the IEEE 488 GPIB interface In ei ther case the comm
32. If on Set serial linefeed mode to off Iffeed of f If of Calibration Menu Read BO calibration parameter bO b0 b0 9 b0 0 Set BO calibration parameter to n b0 n b0 0 999 9 to 999 9 Read BG calibration parameter bg bg bg 999 99 bg 156 25 Set BG calibration parameter ton bg n bg 156 25 999 9 to 999 9 Read low set point limit value tllow tl tl 999 tl 80 Set low set point limit to n tllow n tl 80 999 9 to 999 9 Read high set point limit value th igh th th 999 th 205 Set high set point limit to n th igh n th 205 999 9 to 999 9 Miscellaneous not on menus Read firmware version number ver sion ver ver 9999 9 99 ver 2100 3 56 Read structure of all commands h elp h list of commands Read Heater f f f1 9 f1 1 Set Heater f1 1 0 Dor1 Set heater to low fl n f1 0 Set heater to high fl n flt Read Refrigeration f2 f2 12 9 12 0 Set Refrigeration f2 1 0 0or1 Set Refrigeration to on f2 n f2 1 Set Refrigeration to off f2 n f2 0 Read Expansion Valve 1 13 13 f3 9 13 1 Set Expansion Valve 1 f3 1 0 0or1 Set Expansion Valve 1 to on f3 n f3 1 55 7037 7038 7040 7041 Calibration Bath User s Guide Interface Command Summary continued Command Command Returned Acceptable Command Description Format Example Returned Example Values Set Expansion Valve 1 to off f3 n f3 0 Read Cooling Power f4 f4 14 9 14 1 Set Back Pressure f4z1 0 0or1 Set back pressure on f4 n f4 1 Set back pressure off f4 n f4
33. RR ER 42 9 8 Cutout ce go risa oo mu OO E Sov v3 44 9 9 Controller Configuration e 45 9 10 Probe Parameters o ena 00000 eee eee ee 45 O0 1 ROMS geg ed NS 46 910 2 ALPHA o undas Soy seed Bek SoH taal a SO RC RUE SRO A 46 9 11 Operating Parameters e 46 011 3 Cutout Reset Modes ecc sa doe Be ae ea dead ae Piece s 46 9 12 Serial Interface Parameters o 47 9 12 1 Band Rail a Rog A Bee Re Ae ke Ree de 47 0422 Sample Period 2a o a oh OR Wege t o OR 47 0123 Duplex Mode 42 o Sk ha kek dee te e eee RR 48 ONDA Ianefeed oir a Se ee Gd a o OY eee de Re dde ded 48 9 13 IEEE 488 Parameters llle 49 9 13 1 IEBE 488 Address llle 49 9 14 Calibration Parameters llle 49 9 14 1 ls D 50 0 142 iBO and BG ue cues Eun ia Ae ove E eie d 50 9 14 3 Hand T ae udo ep E og A A dD Hee edidi 50 10 Digital Communication Interface 51 10 1 Serial Communications lll 51 10 1 1 Wirihg awe oem mom Bak xem mw RC RR Bu XR XR pee ed dede s 51 LOND Setup gt Ru Aon RU XUI REA BA OP qr Reg RI pU Ce eg 51 10 1 2 1 CBaud Rale 2 5 3o ade ep A ts into e bbs ater 8L sl c e das 52 10 1 2 2 Sample Period i cm ia xS OU Ren boxe eu Re UR ae ae a 52 10 1 2 3 Duplex Mode 000 4d xr Re ea ee rd UC aude dede e deed 52 10 1 2 4 Tanefeed 2d ox ERE Run AA A aom we Rum
34. Ry and ALPHA are adjusted to minimize the set point error at each of two different bath temperatures Any two reasonably separated bath temperatures may be used for the calibration However best results are ob tained when using bath temperatures which are just within the most useful op erating range of the bath The further apart the calibration temperatures the larger will be the calibrated temperature range but the calibration error will also be greater over the range If for instance 0 C and 100 C are chosen as the cali bration temperatures then the bath may achieve an accuracy of maybe 0 03 C over the range 10 to 110 C Choosing 30 C and 70 C may allow the bath to have a better accuracy of maybe 0 01 C over the range 25 to 75 C but outside that range the accuracy may be only 0 05 C 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 bath to the lower set point which we will call t Wait for the bath to reach the set point and allow 15 minutes to stabilize at that temperature Check the bath stability with the thermometer When both the bath and the thermometer have stabilized measure the bath temperature with the thermometer and compute the tempera ture error err which is the actual bath temperature minus the set point temper ature If for example the bath is set for a lower set point of tj Z0 C and the
35. Salt Decomposition Starts EE Shaded area represents usable range of fluid starting at BP Boiling Point 50 centistokes Lighter shading represents decreasing CS Centistokes viscosity while vaporization and decomposition increase EP Evaporation Point fluid loss due to evaporation FL Flash Point FR Freeze Point PP Pour Point Black area represents liquid range with excessive viscosity Range over which a fume hood is recommended Figure 6 Chart of various bath fluids and their properties centistokes and below optimum stirring can occur These are rules of thumb which have been useful for most applications Fume Point The point at which a fume hood should be used This point is very subjective in nature and is impacted by individual tolerance to different fumes and smells how well the bath is covered the surface area of the fluid in the bath the size and ventilation of the facility where the bath is located and others We assume the bath is well covered at this point This is also subject to company policy 32 8 General Operation Stirring 8 2 8 3 8 4 Flash Point The point at which ignition may occur See flash point discussion in Section 8 1 8 The point shown may be either the open or closed cup flash point Boiling Point At the boiling point of the fluid the temperature stability is diffi cult to maintain Fuming is excessive Excessive amounts of heater power may
36. a Di 4 Unpacking oc 3c oss oon 9m ea gee Gas began 13 42 Set pu ca s oed e ck Ren HS EO SS Ox BR 13 AS POW E roct ebooks oe Baa ose a E BASS EN 14 4 4 Setting the Temperature 14 5 Installation 17 5 1 Bath Environment ss e se eaha e aa o a ot RR m Rs 17 5 2 Dry out Period se uo onem m he Ee e 17 5 3 Bath Preparation and Filling ln 17 54 Probe es ee A A Swe Es 18 II POWER oy eR ov CEU bb Ss 18 6 Bath Use 19 6 General tocas eS Be MEG x E OR Sa 19 62 Comparison Calibration leen 19 6 3 Calibration of Multiple Probes 20 7 Parts and Controls 21 7 1 Front Control Panel sacra secsi e e ene dee p e a i e R eo 21 72 Side Panel na stoe p so a a E ws 22 Lo Back Panel 2 mo adu eee Bk AS eee ees 23 7 4 Bath Tank and Lid s aoan eani ao s maa a e a E e 25 ii 8 General Operation 27 8 1 8 2 8 3 8 4 8 5 8 6 Bath Fluid ooo oh eae See a OR RAE S Ee ES 27 8 1 1 Temperature Range ooo ata oa OHSAS eR ee 27 8 1 2 MISCOSIL soo ach a mee Rose A Ee i Rd Le SR S Cp 27 8 1 3 Specific Heat moy doo ox RN Reb em amp dex EY dO em xag 27 8 1 4 Thermal Conductivity sica Ra or Reb rU n GR Rs 28 8 1 5 Thermal Expansion lt s 4 seo or t e mmm eee an A 28 8 1 6 Electrical Resistivity ses eo a e OR Tec medo e I e tee 28 8 1 7 Fluid L
37. ad this section carefully and attempt to understand and solve the problem If the probe seems faulty or the problem cannot otherwise be solved contact an Authorized Service Center for assistance Be sure to have the model number and serial number of your instrument available Problem Causes and Solutions The heater indicator LED stays red but the temperature does not increase The display does not show cutout nor displays an incorrect bath temperature but the controller otherwise appears to op erate normally The problem may be either insufficient heating or no heating at all or too much cooling Insufficient heating may be caused by the heater power setting being too low especially at higher operat ing temperatures Switching to the higher heater power switch setting if available may solve the problem Try reducing cooling capacity by increasing the cooling temperature switching the cooling power switch to LOW or switching off the cooling altogether One or more burned out heaters or blown heater fuses may also cause this problem If the heaters seem to be burned out contact an Authorized Service Center for assistance The controller display flashes cutout and the heater does not operate The display will flash cutout alternately with the process temperature If the process temperature displayed seems grossly in error consult the problem The display flashes cutout and an incorrect
38. age or fire 10 Digital Communication Interface Serial Communications 10 10 1 10 1 1 10 1 2 Digital Communication Interface If supplied with the option the bath is capable of communicating with and be ing controlled by other equipment through the digital interface Two types of digital interface are available the RS 232 serial interface and the IEEE 488 GPIB interface With a digital interface the bath may be connected to a computer or other equipment This allows the user to set the bath temperature monitor the tem perature and access any of the other controller functions all using remote com munications equipment In addition the heater power setting and cooling capacity may be controlled using the interface To enable the heater to be switched to high using the interface the HEATER switch must be set to the LOW position The cooling power switch must be set to OFF to enable re mote control Serial Communications The bath may be 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 10 3 with the exception of the BAUD rate setting The serial interface uses 8 data bits 1 stop bit and no parity RS 232 Cable Wiring for IBM PC and Compatibles Wiring The serial communications cable atta instrument Computer DTE che
39. ain the fluid to prevent any injury The side of the bath with the compressor is heavier than the tank side To safely move the bath two people are required Bath Environment The bath is a precision instrument which should be located in an appropriate environment The location should be free of drafts extreme temperatures and temperature changes dirt etc The surface where the bath is placed must be level If used at higher temperatures where fluid vaporization is significant a fume hood should be used Dry out Period Before initial use after transport and any time the instrument has not been en ergized for more than 10 days the bath will need to be energized for a dry out period of 1 2 hours before it can be assumed to meet all of the safety requirements of the IEC 1010 1 Bath Preparation and Filling The bath is not provided with a fluid Various fluids are available from Hart Scientific and other sources Depending on the desired temperature range any of the following fluids as well as others may be used in the bath 17 7037 7038 7040 7041 Calibration Bath User s Guide 5 4 5 5 e Water e Ethylene Glycol Water e Methanol e Mineral oil e Silicone oil Fluids are discussed in detail in Section 8 1 Remove any access hole cover from the bath and check the tank for foreign matter dirt remnant packing material etc Use clean unpolluted fluid Care fully fill the bath through the large square
40. ands are terminated with a carriage return character The in terface 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 53 7037 7038 7040 7041 Calibration Bath User s Guide Table 4 Interface Command Summary Command Command Returned Acceptable Command Description Format Example Returned Example Values Display Temperature Read current set point s etpoint S set 9999 99 C or F set 150 00 C Set current set point to n s etpoint n s 450 Instrument Range Read vernier v ernier V v 9 99999 v 0 00000 Set vernier to n v ernier n v 00001 Depends on Configuration Read temperature t emperature t t 9999 99 C or F t 55 69 C Read temperature units u nits u u X uc Set temperature units u nits c f CorF Set temperature units to Celsius u nits c u C Set temperature units to u nits f u f Fahrenheit Secondary Menu Read proportional band setting pr op band pr pr 999 9 pr 15 9 Set proportional band to n pr op band n pr 8 83 Depends on Configuration Read cutout setting c utout c c 9999 x xx c
41. art reserves the right to invoice Buyer for importation costs of repairs replacement parts when product purchased in one country is submitted for repair in another country Hart s warranty obligation is limited at Hart s option to refund of the purchase price free of charge re pair or replacement of a defective product which is returned to a Hart authorized service center within the warranty period To obtain warranty service contact your nearest Hart authorized service center or send the product with a description of the difficulty postage and insurance prepaid FOB Destination to the nearest Hart au thorized service center Hart assumes no risk for damage in transit Following warranty repair the prod uct will be returned to Buyer transportation prepaid FOB Destination If Hart determines that the failure was caused by misuse alteration accident or abnormal condition or operation or handling Hart will provide an estimate or 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 IM PLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE HART SHALL NOT BE LIABLE FOR ANY SPECIAL INDIRECT
42. asuring the errors again If desired the calibration procedure may be repeated again to further im prove the accuracy Calibration Example The bath is to be used between 25 and 75 C and it is desired to calibrate the bath as accurately as possible for operation within this range The current val ues for Rg and ALPHA are 100 000 and 0 0038500 respectively The calibra tion points are chosen to be 30 00 and 80 00 C The measured bath temperatures are 29 843 and 79 914 C respectively Refer to Figure 10 for ap plying equations to the example data and computing the new probe constants 11 Calibration Procedure Calibration Example R 100 000 ALPHA 0 0038500 tj 30 00 C measured t 29 843 C ty 80 00 C measured t 79 914 C Compute errors err 29 843 30 00 C 0 157 C erry 79 914 80 00 C 0 086 C Compute Ro _ 70 086 x 30 0 0157 x 80 0 7 R 0 00385 1 100 000 100 077 80 0 30 0 0 Compute ALPHA B 1 0 00385 x 80 0 0 157 1 0 00385 x 30 0 0 086 ALPHA 1 0 00385 0 0038416 80 0 30 0 Figure 10 Calibration Example 61 12 Maintenance 12 Maintenance The calibration instrument has been designed with the utmost care Ease of op eration 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
43. ate value will then be displayed 1200 b Current baud rate The baud rate of the bath 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 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 bath 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 SAMPLE Serial sample period parameter ai Press SET to choose to set the sample period The current sample period value will be displayed 47 7037 7038 7040 7041 Calibration Bath User s Guide 48 9 12 3 9 12 4 SA 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 88 New sample period O AO 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 bath via the serial interface are immediately
44. ation The closed cup temperature is always the lower of the two The closed cup represents the contained vapors in 8 General Operation Bath Fluid 8 1 10 8 1 10 1 8 1 10 2 8 1 10 3 8 1 10 4 side the tank and the open cup represents the vapors escaping the tank Oxygen and an ignition source will be less available inside the tank Environmentally hazardous fluids require special disposal according to applica ble federal or local laws after use Cost Cost of bath fluids may vary greatly from cents per gallon for water to hun dreds of dollars per gallon for synthetic oils Cost may be an important consid eration when choosing a fluid Commonly Used Fluids Below is a description of some of the more commonly used fluids and their characteristics Water Water is often used because of its very low cost availability and excellent tem perature control characteristics Water has very low viscosity and good thermal conductivity and heat capacity which makes it among the best fluids for control stability at low temperatures Temperature stability is much poorer at higher temperatures because water condenses on the lid cools and drips into the bath Water is safe and relatively inert The electrical conductivity of water may pre vent its use in some applications Water has a limited temperature range from a few degrees above 0 C to a few degrees below 100 C At higher temperatures evaporation becomes significant Wat
45. be required because of the heat of vaporization Decomposition All high temperature fluids may be reach a temperature point at which decomposition of some form will begin While it always begins slowly at some lower temperature the rate can increase to the point of danger or im practicality at a higher temperature Stirring Stirring of the bath fluid is very important for stable temperature control The fluid must be mixed well for good temperature uniformity and fast controller response The stirrer is precisely adjusted for optimum performance Power Power to the bath is provided by an AC mains supply See Section 3 1 Specifi cations for power details Refer to and read the CAUTION in front of this man ual concerning brownout and over voltage protection CAUTION Check the back panel label for the correct voltage and fre quency prior to energizing the unit Power to the bath passes through a fil ter to prevent switching spikes from being transmitted to other equipment To turn on the bath switch the control panel power switch to the ON position The stir motor will turn on the LED display will begin to show the bath tem perature and the heater will turn on or off until the bath temperature reaches the programmed set point When powered on the control panel display briefly shows a four digit number This number indicates the number of times power has been applied to the bath Also briefly displayed is data which indicates the
46. ch as this the heater output power is proportional to the bath 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 bath 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 bath depends on the width of the proportional band See Figure 8 If the band is too wide the bath temperature will deviate ex cessively from the set point due to varying external conditions This is because the power output changes very little with temperature and the controller cannot respond very well to changing conditions or noise in the system If the propor tional band is too narrow the bath temperature may swing back and forth be cause the controller overreacts to temperature variations For best control stability the proportional band must be set for the optimum width The optimum proportional band width depends on several factors among which are fluid volume fluid characteristics viscosity specific heat thermal conduc tivity heater power setting operating temperature and stirring Thus the pro portional band width may require adjustment for best bath stability when any of these condi
47. controller automatically turns off the heater with a second mechanical re lay anytime the bath temperature is more than a certain amount above the set point temperature As a second protection device the controller is also equipped with a separate thermocouple temperature monitoring circuit which shuts off the heater if the temperature exceeds the cut out set point 8 General Operation Temperature Controller The controller allows the operator to set the bath temperature with high resolu tion set the cut out adjust the proportional band monitor the heater output power and program the controller configuration and calibration parameters The controller may be operated in temperature units of degrees Celsius or Fahr enheit The controller is operated and programmed from the front control panel using the four key switches and digital LED display The controller may also be optionally equipped with a serial RS 232 or IEEE 488 GPIB digital interface for remote operation Operation of the controller using the front control panel is discussed following in Section 9 Operation using the digital interfaces is dis cussed in Section 10 When the controller is set to a new set point the bath heats or cools to the new temperature Once the new temperature is reached the bath usually takes 10 15 minutes for the temperature to settle and stabilize There may be a small over shoot or undershoot of about 0 5 C 35 9 Controller Operation Bath Tempera
48. controller hardware configu ration This data is used in some circumstances for diagnostic purposes Heater The power to the bath heater is precisely controlled by the temperature control ler to maintain a constant bath temperature Power is controlled by periodically switching the heater on for a certain amount of time using a solid state relay The front panel red green control indicator shows the state of the heater The control indicator glows red when the heater is on and glows green when the 33 7037 7038 7040 7041 Calibration Bath User s Guide 34 8 5 8 6 heater is off The indicator will pulse constantly when the bath is maintaining a stable temperature The heater has two power level settings The HIGH heater power setting is used to quickly heat up the bath fluid to the desired operating temperature The HIGH heater power setting may also be required for control at high tempera tures The LOW setting is used for control at lower temperatures and for scanning at slower rates When controlling at the HIGH heater power setting instead of LOW the proportional band may need to be increased typically by a factor of four to compensate for the increase in power gain Otherwise the temperature may oscillate Cooling The back pressure control valve limits the cooling capacity of the unit It will normally be open all the way full CCW for temperature slewing and opera tion If during operatio
49. ct from different types of probes is not to tally eliminated Even though all baths have horizontal and vertical gradients 19 7037 7038 7040 7041 Calibration Bath User s Guide 20 6 3 these gradients are minimized inside the bath work area Nevertheless probes should be inserted to the same depth in the bath liquid Be sure that all probes are inserted deep enough to prevent stem effect From research at Hart Scien tific we suggest a general rule of thumb for immersion depth to reduce the stem effect to a minimum 15 x the diameter of the UUT the sensor length CAUTION Do not submerge the probe handles If the probe handles get too warm during calibration at high temperatures a heat shield could be used just below the probe handle This heat shield could be as simple as aluminum foil slid over the probe before inserting it in the bath or as com plicated as a specially designed reflective metal apparatus When calibrating over a wide temperature range better results can generally be achieved by starting at the highest temperature and progressing down to the lowest temperature Probes can be held in place in the bath by using probe clamps or drilling holes in the access cover Other fixtures to hold the probes can be designed The ob ject is to keep the reference probe and the probe s to be calibrated as closely grouped as possible in the working area of the bath Bath stability is maximized when the bath working area is ke
50. dian Standards Association Us OVERVOLTAGE Installation CATEGORY II Pollution Degree 2 per IEC1010 1 re fers to the level of Impulse Withstand Voltage protection provided Equipment of OVERVOLTAGE CATEGORY II is energy consuming equipment to be supplied from the fixed installation Examples include household office and laboratory appliances C TIC Australian EMC Mark p CATI The European Waste Electrical and Electronic Equipment WEEE Directive 2002 96 EC mark 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 Table 2 The following definitions apply to the terms Warning and Caution e WARNING identifies conditions and actions that may pose hazards to the user e CAUTION identifies conditions and actions that may damage the in strument being used A WARNINGS To avoid possible electrical shock or personal injury follow these guidelines GENERAL DO NOT use the 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 DO NOT use the instrument in environments other than those listed in the user s guide DO NOT overfill the bath Overflowing extremely cold or hot fluid may be harmful to the operator See section 5 3 Bath Preparati
51. e SET and EXIT keys down while power to the controller is switched on The display shows init indicating the memory is being initialized At this point each of the controller parameters and calibration constants must be repro grammed into memory You can obtain the calibration constants from the test results sheet of the calibration report If the problem reoccurs the battery should be replaced Contact an Authorized Service Center for assistance If initializing the memory does not remedy the problem there may be a failed electronic compo nent Contact an Authorized Service Center for assistance The displayed process tempera ture is in error and the controller remains in the cooling or the heating state at any set point value Possible causes may be either a faulty control probe or erroneous data in memory The probe may be disconnected burned out or shorted Check that the probe is connected properly The probe may be checked with an ohmmeter to see if it is open or shorted The probe is a platinum 4 wire Din 43760 type therefore the resistance should read 0 2 to 2 0 ohms between pins 1 and 2 on the probe con nector and 0 2 to 2 0 ohms between pins 3 and 4 The resistance should read from 100 to 300 ohms between pins 1 and 4 depending on the temperature If the probe is defective contact an Authorized Service Center for assistance If the problem is not the probe erroneous data in memory may be the cause R
52. e initialize the memory as discussed in the problem The dis play flashes cutout and an incorrect process temperature above If the problem remains the cause may be a defective electronic compo nent contact an Authorized Service Center for assistance The controller controls or at tempts to control at an inaccurate temperature 66 The controller operates normally except when con trolling at a speci fied set point At this set point the temperature does not agree with that measured by the user s reference thermometer to within the spec ified accuracy This problem may be caused by an actual difference in temperature between the points where the control probe and ther mometer probe measure temperature by erroneous bath calibration parameters or by a damaged control probe Check that the bath has an adequate amount of fluid in the tank and that the stirrer is operating properly Check that the thermometer probe and control probe are both fully inserted into the bath to minimize temperature gradient errors Check that the calibration parameters are all correct ac cording to the certification sheet If not reprogram the constants The memory backup battery may be weak causing errors in data as described in the problem The display flashes cutout and an incorrect process tem perature Check that the control probe has not been struck bent or damaged If the cause of the problem remains un known contact an Auth
53. er used in the bath should be distilled or softened to prevent mineral deposits Consider using an algaecide chemical in the water to prevent contamination Ethylene Glycol The temperature range of water may be extended by using a solution of 1 part water and 1 part ethylene glycol antifreeze The characteristics of the ethylene glycol water solution are similar to water Use caution with ethylene glycol since the fluid is very toxic Ethylene glycol must be disposed of properly Methanol Methanol or methyl alcohol is often used at low temperatures below 0 C Methanol is relatively inexpensive has good control characteristics and has a low freeze point Methanol is very toxic so care must be taken when using and disposing of this fluid Mineral Oil Mineral oil or paraffin oil is often used at moderate temperatures above the range of water Mineral oil is relatively inexpensive At lower temperatures mineral oil is quite viscous and control may be poor At higher temperatures vapor emission becomes significant The vapors may be dangerous and a fume 29 7037 7038 7040 7041 Calibration Bath User s Guide 30 8 1 10 5 8 1 11 8 1 11 1 8 1 11 2 hood should be used As with most oils mineral oil expands as temperature in creases so be careful not to fill the bath too full that it overflows when heated The viscosity and thermal characteristics of mineral oil is poorer than water so temperature stability will not be as g
54. eter Baud Rate The baud rate is the first parameter in the menu The display will prompt with the baud rate parameter by showing BA U d Press SET to choose to set the baud rate The current baud rate value will then be displayed The baud rate of the serial communications may be programmed to 300 600 1200 or 2400 baud The baud rate is preprogrammed to 1200 baud Use UP or DOWN to change the baud rate value Press SET to set the baud rate to the new value or EXIT to abort the operation and skip to the next parameter in the menu Sample Period The sample period is the next parameter in the menu and prompted with SA f PLE The sample period is the time period in seconds between temperature measurements transmitted from the serial interface If the sample rate is set to 5 the bath transmits the current measurement over the serial interface approxi mately 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 dis played value Duplex Mode The next parameter is the duplex mode indicated with d U P L 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
55. he bath has four control functions with the digital interface These are heater power high low cooling on off expan sion valve open closed and back pressure valve open closed 10 Digital Communication Interface Power Control Functions 10 4 1 10 4 2 Heater Control To control the heater with the digital interface the front panel heater switch must be set to LOW 500 W The heater function is controlled with the F1 command Setting the F1 parameter to 0 sets the heater to LOW 500 W and setting it to 1 sets the heater to HIGH 1000 W Sending F1 with no value causes the controller to return a value showing what the heater setting is When the heater setting is changed a pop is heard as the heater relay opens or closes Cooling Control To control the refrigeration power with the digital interface the front panel re frigeration switch must be off The refrigeration power function is controlled with the F2 command Setting the F2 value to O turns the refrigeration off and setting it to 1 turns it on F2 alone returns 0 or 1 showing the state of the refrigeration power control The F3 command controls the cooling temperature expansion valve This valve adjusts the cooling temperature which sets the cooling capacity Setting F3 to 1 opens the valve on or high and 0 closes the valve off or low A command with no value returns the current setting With the valve closed the cooling temperature is set
56. heat is the measure of the heat storage ability of the fluid Specific heat though to a lesser degree also affects the control stability and the heating and cooling rates Generally a lower specific heat causes slightly better control stability and quicker heating and cooling With fluids with higher specific heat the controller may require a decreased proportional band to compensate for the decrease in sensitivity of the bath temperature to heat input 27 7037 7038 7040 7041 Calibration Bath User s Guide 28 8 1 4 8 1 5 8 1 6 8 1 7 8 1 8 Thermal Conductivity Thermal conductivity measures how easily heat flows through the fluid Ther mal conductivity of the fluid affects the control stability temperature unifor mity and probe temperature settling time Fluids with higher conductivity distribute heat more quickly and evenly improving bath performance Thermal Expansion Thermal expansion describes how the volume of the fluid changes with temper ature Thermal expansion of the fluid used must be considered since the in crease in fluid volume as the bath temperature changes may cause overflow Excessive thermal expansion may also be undesirable in applications where constant liquid level is important Oils typically have significant thermal expansion Electrical Resistivity Electrical resistivity describes how well the fluid insulates against the flow of electric current In some applications such as measuring
57. horized 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 7037 7038 7040 7041 Calibration Bath User s Guide 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 Service Center 60 Alexandra Terrace 403 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 1 Before You Start Authorized Service Centers Model Number Serial Number Voltage Complete description of the problem 2 Introduction Introduction The Hart Scientific Model 7037 7038 7040 7041 are very precise constant tem perature baths An innovative state of the art solid state temperature controller has
58. idered You are responsible for reading the Material Safety Data Sheets and making a judgment here Cost may require some compromises as well Hart Scientific cannot be liable for the suitability of application or for any personal injury damage to equipment product or facilities in using these fluids The charts include information on a variety of fluids which are often used as heat transfer fluid in baths Because of the temperature range some fluids may not be useful with your bath About the Graph The fluid graph visually illustrates some of the important qualities of the fluids shown Temperature Range The temperature scale is shown in degrees Celsius A sense of the fluid s general range of application is indicated Qualities including pour point freeze point important viscosity points flash point boiling point and others may be shown 8 General Operation Bath Fluid Table 2 Table of various bath fluids and their properties Fluid Lower Upper Specific Heat Thermal Thermal Hart Part Temperature Temperature Flash Viscosity Specific cal g C Conductivity Expansion Resistivity No Limit Limit Point centistokes Gravity cal s cm C cm cm C 100 cm Halocarbon 0 8 90 C v 70 C e NONE 5 7 50 C 1 71 40 C 0 2 0 0004 0 0011 5019 0 8 40 C 0 5 70 C Methanol 96 C fr 60 C b 54 C 1 3 35 C 0 810 0 C 0 6 0 0005 20 C 0 0014
59. ifetime 040 decken eg te Eder de c RR A 28 8 1 8 Sale acu o uice Wess wie de Sepe ied Ie Nos dos PS desto 28 8 1 9 ol C Tr 29 8 110 Commonly Used Fluids ouo RECS xy maie OR wo OR edo E 8 29 8 1 10 1 Water s ete ARNO 29 8 510 2 Ethylene Glycol s eo nm o hom o nh khe hE Sm due eo a 29 8010 3 Methanol s a cota UAI dU DIR a ee cae Cpu a NU Med dre 29 8 1 10 4 Mineral Oil qe memet eri ten oe Roel ae Gee 29 8 1 10 5 Silicon Oil i5 us Dx Roa uh dob hoe ad der Vn eR Eod PORTS de s 30 8 1 11 Fluid Characteristics Charts s sa ca sooo Re ae 30 8 11 1 Limitations and Disclaimer 2 eom room o Ro R momo mm n 30 8 1 11 2 About he Graph 4 54 ea bei ea als Ron a op A RA de 30 SUCHE 2o 686 B RR 9 noe 9 Roy y Rob Ah 9 X UR E e ee 33 POWER a d dry eu Roe uem ghe ae 33 Heater c deg dex a E Bee SY e I SE RS 33 Cooling sa ee sb Ga ee Sew WE XO O9 p we a 34 Temperature Controller ee en 34 9 Controller Operation 37 9 1 Bath Temperature e 37 9 2 Res tculoUL 2 eeart ee eee m oko ow a 37 9 3 Temperature Setpoint ss oe Go e eee 39 9 3 1 Programmable Set points oe cec a oo 39 9 3 2 Setpoint Value uae AR AUR A A RIS 40 9 3 3 SetPoint VerNiEr s ny rai gu pode opos e eie pa Be 40 9 4 Temperature Scale Units 41 9 5 Secondary Menu scan aaa 41 0 6 Heater POWeE cus A O Re Te 42 9 7 Proportional Band 5 2 oss sk RR o
60. instrument in dirty or dusty environments A battery is used to maintain operating parameters in the unit All operat ing parameters including calibration parameters should be checked on a regular basis to insure accuracy and proper operation of the instrument See the troubleshooting section for the procedure on checking the status of the battery Tf the outside of the bath becomes soiled it may be wiped clean with a damp cloth and mild detergent Do not use harsh chemicals on the surface which may damage the paint Periodically check the fluid level in the bath to ensure that the level has not dropped A drop in the fluid level affects the stability of the bath Changes in fluid level are dependent upon several factors specific to the environment in which the equipment is used A schedule cannot be out lined to meet each environmental setting Therefore the first year the bath should be checked weekly with notes kept as to changes in bath fluid Af ter the first year the user can set up a maintenance schedule based on the data specific to the application Heat transfer medium lifetime is dependent upon the type of medium and the environment The fluid should be checked at least every month for the first year and regularly thereafter This fluid check provides a baseline for knowledge of bath operation with clean usable fluid Once some fluids have become compromised the break down can occur rapidly Particular attention should be paid
61. 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 41 7037 7038 7040 7041 Calibration Bath User s Guide 42 9 6 9 7 Heater Power The temperature controller controls the temperature of the bath 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 to the bath the user can tell if the bath is heating up to the set point cooling down or con trolling at a constant temperature Monitoring the percent heater power lets the user know how stable the bath 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 f fen of full power ze e Access heater power in secondary menu ig Pct j 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 su
62. m the set point by pressing SET The vernier setting is displayed as a 6 digit num ber with five digits after the decimal point This is a temperature offset in de grees of the selected units C or F 0 00000 ped Current vernier value in C To adjust the vernier press UP or DOWN Unlike most functions the ver nier setting has immediate effect as the vernier is adjusted SET need not be pressed This allows one to continually adjust the bath temperature with the vernier as it is displayed 0 00090 New vernier setting Next press EXIT to return to the temperature display or SET to access the temperature scale units selection SET Access scale units 9 Controller Operation Temperature Scale Units 9 4 9 5 Temperature Scale Units The temperature scale units of the controller may be set by the user to degrees Celsius C or Fahrenheit F These units are used in displaying the bath temperature set point vernier proportional band and cutout set point The temperature scale units selection is accessed after the vernier adjustment function by pressing SET From the temperature display function access the units selection by pressing SET 4 times 25 00 j Bath temperature ped p pel Press SET to accept the new selection and resume displaying the bath temperature SET Set the new units and resume temperature display Secondary Menu Functions which are used
63. n bath fluids and section 9 8 Cutout A CAUTIONS Always operate the instrument in room temperatures listed in section 3 2 En vironmental Conditions Allow sufficient air circulation by leaving at least 15 cm 6 inches of clearance around the instrument DO NOT overfill the bath Overflowing fluid may damage the electrical sys tem See section 5 3 Bath Preparation and Filling for specific instructions Read section 6 Bath Use before placing the bath into service DO NOT turn the bath on without fluid in the tank DO NOT change the values of the bath calibration constants from the factory set values The correct setting of these parameters is important to the safety and proper operation of the bath The refrigeration may be damaged or the lifetime shortened if the set point temperature is set above 60 C for more than one hour with the refrigeration manually on Ensure that the refrigeration is off when the bath is used above 60 C The Factory Reset Sequence should be performed only by authorized person nel if no other action is successful in correcting a malfunction You must have a copy of the most recent Report of Test to restore the test parameters DO NOT operate this instrument in an excessively wet oily dusty or dirty environment 1 Before You Start Authorized Service Centers 1 3 Most probes have handle temperature limits Be sure that the probe handle tem perature limit is not exceeded in the air above
64. n at the left on the display followed by the current set point value 25 00 Bath temperature in degrees Celsius NRNERESRERRRANERREEEESEAENSENREYBRE 4 340 0 New set point memory 4 40 0 C TAO Press SET to accept the new selection and access the set point value SET Accept selected set point memory 39 7037 7038 7040 7041 Calibration Bath User s Guide 40 9 3 2 9 3 3 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 E at the left Set point 4 value in C If the set point value need not be changed then press EXIT to resume dis playing the bath temperature Press UP or DOWN to adjust the set point value t 42 50 New set point value When the desired set point value is reached press SET to accept the new value and access the set point vernier If EXIT is pressed instead then any changes made to the set point will be ignored SET Accept new set point value Set point Vernier The set point value can only be set with a resolution of 0 01 C The user may want to adjust the set point slightly to achieve a precise bath temperature The set point vernier allows one to adjust the temperature below or above the set point by a small amount with very high resolution Each of the 8 stored set points has an associated vernier setting The vernier is accessed fro
65. n the front panel meter indicates excessive cooling this valve is closed partially turn CW until the percentage of heating to cooling is brought into line Wait a few minutes after each adjustment until the system settles The cooling temperature should NOT be set above 90 psig About 45 C the re frigeration is not required as there is sufficient cooling to the room Wait a few minutes after each adjustment until the system establishes itself Readjust if re quired after settling for a while For maximum cooling for slewing to lower temperatures the back pressure valve should be fully open and the cooling temperature set to 0 C Readjust higher or lower as required after set temperature is reached Temperature Controller The bath temperature is controlled by Hart Scientific s unique hybrid digi tal analog temperature controller The controller offers the tight control stability of an analog temperature controller as well as the flexibility and programmabil ity of a digital controller The bath temperature is monitored with a platinum resistance sensor in the con trol probe The signal is electronically compared with the programmable refer ence signal amplified and then fed to a pulse width modulator circuit which controls the amount of power applied to the bath heater The bath is operable within the temperature range given in the specifications For protection against solid state relay failure or other circuit failure the micro
66. nt temperature be careful not to exceed the temperature limit of the bath fluid The over temperature cut out should be correctly set to prevent this from happening See Section 9 8 If operating the bath below 45 C set the COOLING power switch to ON The cooling temperature may require adjustment to provide the proper amount of cooling See Section 8 5 To obtain optimum control stability adjust the proportional band as discussed in Section 9 7 15 5 Installation Bath Environment 5 5 1 5 2 5 3 A A Installation CAUTION READ SECTION 6 ENTITLED BATH USE before placing the bath in service Incorrect handling can damage the bath and void the warranty This bath is not designed to be portable Therefore moving the bath once it has been installed should be kept to a minimum WARNING Never move a bath that is full of fluid This action could be extremely dangerous and could result in personal injury to the person moving the bath If the bath is going to be placed in an area where it will need to be moved fre quently a special cart can be designed to accommodate the bath making the bath much more portable Hart sells carts designed for these baths However even with a cart the bath should not be moved full of fluid The fluid can splash causing injury or if the bath and cart tip the fluid could cause damage to the surrounding area and personal injury to personnel Tf the bath must be moved be sure to dr
67. o the average sensitivity of the probe between O and 100 C Normally this is set for 0 00385 C Operating Parameters The operating parameters menu is indicated by PAr E Operating parameters menu il Press SET to enter the menu The operating parameters menu contains the cutout reset mode setting Cutout Reset Mode The cutout reset mode determines whether the cutout resets automatically when the bath temperature drops to a safe value or must be manually reset by the operator The parameter is indicated by CEorSE cutout reset mode parameter CTI DIO EA TREE Press SET to access the parameter setting Normally the cutout is set for manual mode 9 Controller Operation Serial Interface Parameters 9 12 9 12 1 9 12 2 Serial Interface Parameters The serial RS 232 interface parameters menu is indicated by SErIRL E 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 baths fitted with the serial interface The parameters in the menu are baud rate sample pe riod 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 current baud r
68. on and Filling for spe cific instructions 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 1 Before You Start Safety Information Before initial use or after transport or after storage in humid or semi humid environments or anytime the instrument 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 requirements of the IEC 61010 1 If the product is wet or has been in a wet environment take necessary measures to remove moisture prior to applying power such as storage in a low humidity temperature chamber operating at 50 C for 4 hours or more DO NOT operate high temperature baths 500 C near flammable materials Extreme temperatures could ignite the flammable material 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 inser tion and removal of probes The instrument is intended for indoor use only The bath is a precision instrument Although it has been designed for optimum durability and trouble free operation it must be handled with care This bath is not designed to be portable Therefore moving the ba
69. ood Mineral oil has very low electrical conductivity Use caution with mineral oil since it is flammable and may also cause serious injury if inhaled or ingested Silicone Oil Silicone oils are available which offer a much wider operating temperature range than mineral oil Like most oils silicone oils have temperature control characteristics which are somewhat poorer than water The viscosity changes significantly with temperature and thermal expansion also occurs These oils have very high electrical resistivity Silicon oils are fairly safe These oils are relatively expensive Fluid Characteristics Charts Table 2 and Figure 6 have been created to provide help in selecting a heat ex change fluid media for your constant temperature bath The charts provide both a visual and numerical representation of most of the physical qualities impor tant in making a selection The list is not all inclusive many usable fluids may not have been shown in this listing Limitations and Disclaimer Every effort has gone into making these charts accurate however the data here does not imply any guarantee of fitness of use for a particular application Working near the limits of a property such as the flash point or viscosity limit can compromise safety or serviceability Sources of information sometimes vary for particular properties Your company s safety policies as well as per sonal judgment regarding flash points toxicity etc must also be cons
70. 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 n or disables 8 F F transmission of a linefeed charac ter LE ASCII 10 after transmission of any carriage return The default setting is with linefeed on The mode may be changed using UP or DOWN and pressing SET Serial Operation Once the cable has been attached and the interface set up properly the control ler immediately begins transmitting temperature readings at the programmed rate The set point and other commands may be sent to the bath via the serial 10 Digital Communication Interface IEEE 488 Communication optional 10 2 10 2 1 10 2 1 1 10 2 2 10 3 interface to set the bath and view or program the various parameters The inter face commands are discussed in Section 10 3 All commands are ASCII charac ter strings terminated with a carriage return character CR ASCII 13 IEEE 488 Communication optional The IEEE 488 interface is available as an option Baths supplied with this op tion may be connected to a GPIB type communication bus which allows many instruments to be connected and controlled simultaneously To eliminate noise the GPIB cable should be shielded Setup To use the I
71. orized Service Center for assis tance 13 Troubleshooting Comments 13 2 13 2 1 Problem Causes and Solutions The controller shows that the out put power is steady but the pro cess temperature is unstable If the bath temperature does not achieve the expected degree of sta bility when measured using a thermometer try adjusting the propor tional band to a narrower width as discussed in Section 9 7 The controller alternately heats for a while then cools This oscillation is typically caused by the proportional band being too narrow Increase the width of the proportional band until the tempera ture stabilizes as discussed in Section 9 7 The controller erratically heats then cools control is unstable If both the bath temperature and output power do not vary periodically but in a very erratic manner the problem may be excess noise in the system Noise due to the control sensor should be less than 0 001 C However if the probe has been damaged or has developed an inter mittent short erratic behavior may exist Check for a damaged probe or poor connection between the probe and bath Intermittent shorts in the heater or controller electronic Circuitry may also be a possible cause Contact an Authorized Service Center for assistance The bath does not achieve low temperatures This problem can be caused by too much heating or not enough cool ing Check that the control indicator glows green sh
72. owing that the controller is attempting to cool The heaters may be disabled as a test by temporarily removing the heater fuses Maximize cooling by switching the cooling on setting the cooling power to high if applicable and setting the cooling temperature to 10 15 C below the bath set point see the chart on the bath Insuffi cient cooling may be caused by lack of refrigerant because of a leak in the system Refer to the Charging Instructions Section The controller does not maintain controller parameters or parame ters are reset each time the power to the unit is removed Note Before performing the memory check you need to record the controller calibration parameters found in the CAL menu of the instru ment and any user adjusted parameters that you have changed such as the programmable set points and proportional band Memory Check Doing a memory check is the easiest way to verify the ability of the battery to maintain controller parameters 1 Power off the instrument 2 Disconnect the instrument from AC power for 10 seconds 3 Reconnect the AC power and power on the instrument 4 If the display shows n T and or the cycle count shows a low num ber such as 0002 the battery is spent and should be replaced Con tact an Authorized Service Center for assistance 5 After replacing the battery you must reprogram the calibration and user adjustable parameters into the controller Comments EMC Directive
73. portant to the accuracy and proper and safe operation of the bath Access to these parameters is avail able to the user only in the event that the controller s memory fails the user may restore these values to the factory settings The user should have a list of these constants and their settings with the manual CAUTION DO NOT change the values of the bath calibration constants from the factory set values The correct setting of these parameters is im portant to the safety and proper operation of the bath The calibration parameters menu is indicated by CAL Calibration parameters menu Press SET five times to enter the menu 49 7037 7038 7040 7041 Calibration Bath User s Guide 50 9 14 1 9 14 2 9 14 3 CTO Parameter CTO sets the calibration of the over temperature cutout This is not adjustable by software but is adjusted with an internal potentiometer BO and BG These parameters calibrate the accuracy of the bath set point These are pro grammed at the factory when the bath is calibrated Do not alter the value of these parameters If the user desires to calibrate the bath for improved accuracy then calibrate RO and ALPHA according to the procedure given in Section 11 H and L These parameters set the upper and lower set point limits of the bath DO NOT change the values of these parameters from the factory set values To do so may present danger of the bath exceeding its temperature range causing dam
74. pt covered In preparing to use the bath for calibration start by e Placing the reference probe in the bath working area e Placing the probe to be calibrated the UUT in the bath working area as close as feasibly possible to the reference probe Calibration of Multiple Probes Fully loading the bath with probes increases the time required for the tempera ture to stabilize after inserting the probes Using the reference probe as the guide be sure that the temperature has stabilized before starting the calibration 7 Parts and Controls Front Control Panel 7 Parts and Controls 7 1 Front Control Panel The following controls and indicators are present on the controller front panel see Figure 2 below 1 the digital LED display 2 the control buttons 3 the bath on off power switch 4 the control indicator light 5 the heater power switch and 6 the cooling power switch 1 The digital display is an important part of the temperature controller be cause it not only displays set and actual temperatures but also displays various bath functions settings and constants The display shows temperatures in val ues according to the selected scale units C or F 2 The control buttons SET DOWN UP and EXIT are used to set the bath temperature set point access and set other operating parameters and access and set bath calibration parameters A brief description of the functions of the buttons follows SET U
75. s and ordinances Consult a qualified electrician DO NOT use an extension cord or adapter plug 7037 7038 7040 7041 Calibration Bath User s Guide 1 2 2 DO use a ground fault interrupt device This instrument contains a fluid A ground fault device is advised in case fluid is present in the electrical system and could cause an electrical shock Always replace the power cord with an approved cord of the correct rating and type If you have questions contact a Authorized Service Center see section 1 3 High voltage is used in the operation of this equipment Severe injury or death may result if personnel fail to observe the safety precautions Before working inside the equipment turn off the power and disconnect the power cord BATH FLUIDS Fluids used in this bath may produce noxious or toxic fumes under certain cir cumstances Consult the fluid manufacturer s MSDS Material Safety Data Sheet Proper ventilation and safety precautions must be observed The instrument is equipped with a soft cutout user settable firmware and a hard cutout set at the factory Check the flash point boiling point or other fluid characteristic applicable to the circumstances of the bath operation En sure that the soft cutout is adjusted to the fluid characteristics of the applica tion As a guideline the soft cutout should be set 10 C to 15 C below the flash point of the bath fluid See section 8 1 Bath Fluid for specific information o
76. s to the bath through the DB 9 oki poole connector at the back of the instru 1NC DCD 1 in 2RxD 2RxD ment Figure 9 shows the pin out of e gt lt ee this connector and suggested cable ANC 4DTR wiring To eliminate noise the serial gs E Path cable should be shielded with low re E mE sistance between the connector Edda uw 9NC ON DB 9 and the shield Setu p Instrument Computer DTE E Connector Connector Before operation the serial interface DB 9 Pin DB 25 Pin of the bath must first be set up by pro ua ix xD e TX gramming the baud rate and other 3TxD 3RxD configuration parameters These pa puni gen ills rameters are programmed within the DSR 6NC e o serial interface menu 7RTS e 7GND 8CTS 8DCD To enter the serial parameter program ERA ming mode first press EXIT while Figure 9 Serial Cable Wiring 51 7037 7038 7040 7041 Calibration Bath User s Guide 52 10 1 2 1 10 1 2 2 10 1 2 3 10 1 2 4 10 1 3 pressing SET and release to enter the secondary menu Press SET repeat edly until the display reads Pr ob E This is the menu selection Press UP repeatedly until the serial interface menu is indicated with 5E 1AL Finally press SET to enter the serial parameter menu In the serial interface parame ters menu are the baud rate the sample rate the duplex mode and the linefeed param
77. sed to display the next parameter in a menu and to set parameters to the displayed value DOWN Used to decrement the displayed value of setable parameters UP Used to increment the displayed value EXIT Used to exit from a menu When EXIT is pressed any changes made to the displayed value will be ignored 3 The on off switch controls power to the entire bath assembly It powers the stirring motor and the bath controller heater circuit 4 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 7037 HIGH PRECISION BATH 40 C to 110 C Hart Scientific HEATER 1 o HEATING COOLING Figure 2 Front Panel 21 7037 7038 7040 7041 Calibration Bath User s Guide 22 7 2 the heater is on When the indicator is green the heater is off and the bath is cooling 5 The heater power switch is used to select the appropriate heater power lev els for heating and controlling the bath at various temperatures 6 The cooling power switch controls power to the cooling compressor and cooling fan Side Panel The side panel has three features see Figure 3 1 the back pressure valve 2 the cooling temperature regulating valve and 3 the cooling temp gauge With the interface option an extra cooling valve HIGH is provided Cooling Back Pressure Temperature Standard O O o
78. tallation of the bath Be sure to place the bath in a safe clean and level location Fill the bath tank with an appropriate liquid For operation at moderate bath temperatures clean distilled water works well Carefully pour the fluid into the bath tank through the large rectangular access hole above the tank avoiding spilling any fluid The fluid must not exceed a height of 1 2 inch below the bath lid The control probe must be inserted through the lid into the bath and plugged into the socket at the back of the bath 13 7037 7038 7040 7041 Calibration Bath User s Guide 4 3 4 4 Power Plug the bath power cord into a mains outlet of the proper voltage frequency and current capability see Section 3 1 Specifications Refer to and read the CAUTION at the front of the manual concerning brownout and over voltage protection CAUTION Check the back panel label for the correct voltage and fre quency prior to energizing the unit Set the HEATER switch on the front panel to position LOW and turn the bath on using the front panel POWER switch The bath will turn on and be gin to heat or cool to reach the previously programmed temperature set point The front panel LED display will indicate the actual bath temperature Setting the Temperature 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
79. th once it has been in stalled should be kept to a minimum Position the bath before the tank is filled with fluid DO NOT attempt to lift the bath Due to the weight of the compres sor it may require four people to safely move the bath The area containing the compressor will be heavier than the rest of the bath DO NOT move a bath filled with fluid This action could be extremely danger ous and could result in personal injury to the person moving the bath The fluid can splash causing injury or if the bath and cart tip the fluid could cause dam age to the surrounding area and personal injury to personnel BURN HAZARD Extremely cold temperatures may be present in this equipment Freezer burns and frostbite may result if personnel fail to observe safety precautions High temperatures may be present in this equipment Fires and severe burns may result if personnel fail to observe safety precautions ELECTRICAL HAZARD These guidelines must be followed to ensure that the safety mechanisms in this instrument will operate properly This mains supply for the instrument must be capable of the power requirements for the instrument as listed in Section 3 1 Specifications The power cord of the instrument is equipped with a three pronged grounding plug for your protection against electrical shock haz ards It must be plugged directly into a properly grounded three prong recepta cle The receptacle must be installed in accordance with local code
80. the fluid The lower tempera ture range of the fluid is determined by the freeze point of the fluid or the tem perature at which the viscosity becomes too great The upper temperature is usually limited by vaporization flammability or chemical breakdown of the fluid Vaporization of the fluid at higher temperatures may affect temperature stability because of cool condensed fluid dripping into the bath from the lid The bath temperature should be limited by setting the safety cut out so that the bath temperature cannot exceed the safe operating temperature limit of the fluid Viscosity Viscosity is a measure of the thickness of a fluid how easily it can be poured and mixed Viscosity affects the temperature stability of the bath With low vis cosity fluid mixing is better which creates a more uniform temperature throughout the bath This improves the bath response time which allows it to maintain a more constant temperature For good control the viscosity should be less than 10 centistokes 50 centistokes is about the upper limit of allowable viscosity Viscosities greater than this cause very poor control stability and may also overheat or damage the stirring motor With oils viscosity may vary greatly with temperature When using fluids with higher viscosities the controller proportional band may need to be increased to compensate for the reduced response time Otherwise the temperature may begin to oscillate Specific Heat Specific
81. the instrument The instrument and any thermometer probes used with it are sensitive instru ments that can be easily damaged Always handle these devices with care Do not allow them to be dropped struck stressed or overheated COLD BATHS Refrigerated baths require that the condensing coil be cleaned periodically Ac cumulation of dust and dirt on the condenser will result in premature failure of the compressor This bath has been equipped with a brownout and over voltage protection de vice as a safety feature to protect the system components Mode of Operation This bath needs to be plugged into the line voltage for at least 2 minutes before operation This is only necessary for the first time the bath is energized or when it is moved from one location to another Turning the bath ON or OFF does not trigger the delay If a High Low voltage condition exists for longer than 5 seconds the bath de energizes An amber indicator on the back panel lights when this condition exists Re energization is automatic upon correction of the fault condition and after a delay cycle of about 2 minutes If a fault condition exists upon application of power the bath will not energize e Under and Over Voltage Protection at 115 VAC Voltage Cutout 12 5 101 129 VAC Voltage Cut In 7 5 106 124 VAC e Under and Over Voltage Protection at 230 VAC Voltage Cutout 12 5 203 257 VAC Voltage Cut In 7 5 213 247 VAC Aut
82. the resistance of bare temperature sensors it may be important that little or no electrical leakage oc cur through the fluid In this case consider a fluid with very high resistivity Fluid Lifetime Many fluids degrade over time because of evaporization water absorption gel ling or chemical breakdown Often the degradation becomes significant near the upper temperature limit of the fluid Safety When choosing a fluid always consider the safety issues associated Obviously where there are extreme temperatures there can be danger to personnel and equipment Fluids may also be hazardous for other reasons Some fluids may be considered toxic Contact with eyes skin or inhalation of vapors may cause injury A proper fume hood must be used 1f hazardous or bothersome vapors are produced WARNING Fluids at high temperatures May pose danger from BURNS FIRE and TOXIC fumes Use appropriate caution and safety equipment Fluids may be flammable and require special fire safety equipment and proce dures An important characteristic of the fluid to consider is the flash point The flash point is the temperature at which there is sufficient vapor given off so that when there is sufficient oxygen present and an ignition source is applied the va por will ignite This does not necessarily mean that fire will be sustained at the flash point The flash point may be either of the open cup or closed cup type Either condition may occur in a bath situ
83. the temperature controller probe The probe must be in this hole for the bath to operate 6 A drain valve is provided for ease of removing the fluid media from the bath Always use a container of adequate size to hold the full load of fluid Some oils are more easily drained at higher temperatures See caution note below 25 7037 7038 7040 7041 Calibration Bath User s Guide Standard Lid Optional Pump Lid Figure 5 Drain Location and Lid Options A WARNING Extreme caution must be maintained to prevent harm to the user or the surrounding environment Do not exceed a 120 C fluid temper ature for draining The valve could be damaged if 120 C is exceeded Insulate the container from the floor or other objects that may be damaged by high temperatures as required 26 8 General Operation Bath Fluid 8 1 General Operation Bath Fluid Many fluids will work with your bath Choosing a fluid requires consideration of many important characteristics of the fluid Among these are temperature range viscosity specific heat thermal conductivity thermal expansion electri cal resistivity fluid lifetime safety and cost Temperature Range One of the most important characteristics to consider is the temperature range of the fluid Few fluids work well throughout the complete temperature range of the bath The temperature at which the bath is operated must always be within the safe and useful temperature range of
84. tions change Of these the most significant factors affecting the op timum proportional band width are heater power setting and fluid viscosity 9 Controller Operation Proportional Band Proportional Band too Narrow Proportional Band too Wide Optimum Proportional Band MM se a gt P a Figure 8 Bath temperature fluctuation at various proportional band settings The proportional band should be wider when the higher power setting is used so that the change in output power per change in temperature remains the same The proportional band should also be wider when the fluid viscosity is higher because of the increased response time The proportional band width is easily adjusted from the bath front panel The width may be set to discrete values in degrees C or F depending on the selected units The optimum proportional band width setting may be determined by monitoring the stability with a high resolution thermometer or with the control ler percent output power display Narrow the proportional band width to the point at which the bath temperature begins to oscillate and then increase the band width from this point to 3 or 4 times wider Table 3 lists typical propor tional band settings for optimum performance with a variety of fluids at se lected temperatures Table 3 Proportional Band Fluid Table Fluid Temperature Heater Setting Proportional Band Stability Water 30 0 C Low 0 04 C 0 001 C Water 60 0 C Low 0 04 C 0 00
85. ture 9 1 9 2 Controller Operation This section discusses in detail how to operate the bath temperature controller using the front control panel Using the front panel key switches and LED dis play the user may monitor the bath temperature set the temperature set point in degrees C or F monitor the heater output power adjust the controller propor tional band set the cut out set point and program the probe calibration param eters operating parameters serial and IEEE 488 interface configuration and controller calibration parameters Controller operations are summarized in the flow chart on page 38 Bath Temperature The digital LED display on the front panel allows direct viewing of the actual bath 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 Bath temperature in degrees Celsius The temperature display function may be accessed from any other function by pressing the EXIT button Reset cutout If the over temperature cutout has been triggered then the temperature display alternately flashes Cub out Indicates cutout condition The message continues to flash until the temperature is reduced and the cutout is reset The cutout has two modes automatic reset and manual reset The mode de termines how the cutout is reset which allows the bath to heat up again When in automatic mode
86. w the upper temperature limit of the fluid and no more than 10 degrees above the upper temperature limit of the bath If the cutout is activated because of excessive bath temperature then power to the heater shuts off and the bath cools The bath cools until it reaches a few de grees below the cutout set point temperature At this point the action of the cut out is determined by the setting of the cutout mode parameter The cutout has two selectable modes automatic reset or manual reset If the mode is set to automatic the cutout automatically resets itself when the bath temperature falls below the reset temperature allowing the bath to heat up again If the mode is set to manual the heater remains disabled until the user manually resets the cutout 9 Controller Operation Controller Configuration 9 9 9 10 The cutout 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 He twice to access the cutout set point El fe Access heater power in secondary menu DO CO T5L 2 New cutout set point To accept the new cutout set point press SET Accept cutout set point The next function is the configuration menu Press EXIT to resume display ing the bath temperature Controller Configuration The controller has a number of configuration and operating options and calibra tion parameters which are programmable via
87. wnout and over voltage protection CAUTION Check the back panel label for the correct voltage and fre quency prior to energizing the unit Be sure the stirring motor power cord is plugged into the STIRRER socket at the back of the bath 6 Bath Use General 6 1 6 2 Bath Use READ BEFORE PLACING THE BATH IN SERVICE The information in this section is for general information only It is not de signed to be the basis for calibration laboratory procedures Each laboratory will need to write their own specific procedures General Be sure to select the correct fluid for the temperature range of the calibration Bath fluids should be selected to operate safely with adequate thermal proper ties to meet the application requirements Also be aware that some fluids ex pand and could overflow the bath if not watched Refer to General Operation Section 8 for information specific to fluid selection and to the MSDS sheet specific to the fluid selected Generally baths are set to one temperature and used to calibrate probes only at that single temperature This means that the type of bath fluid does not have to change Additionally the bath can be left en ergized reducing the stress on the system The bath generates extreme temperatures Precautions must be taken to prevent personal injury or damage to objects Probes may be extremely hot or cold when removed from the bath Cautiously handle probes to prevent personal in jury

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