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Calibration Bath User's Guide

1. 3 The COOLING TEMP gauge is used to indicate the temperature at which the refrigerant is evaporating The COOLING TEMP regulating valve is used to set and then controls this temperature Back Panel The back panel has seven different features see Figure 4 1 The PROBE con nector 2 STIRRER POWER outlet 3 HEATER FUSE 4 110 VAC power cord 5 ELECTRONICS FUSE INTERNAL notation 6 SERIAL NO nota tion 7 amp 8 optional interface connectors and 9 the bath DRAIN 1 2 3 4 5 6 7 8 The PROBE CONNECTOR in the back panel is used for the temperature controller probe The STIRRER POWER is provided for the stirring motor The HEATER FUSES are 10 amp POWER CORD See Section 3 1 Specifications for power details The ELECTRONICS FUSE is located inside the cabinet and is a 1 4 amp fuse If the fuse needs to be replaced contact a Fluke Calibration Autho rized Service Center for assistance The SERIAL NUMBER and model numbers are located on the back panel When consulting with a service center use the model and serial numbers to properly identify your instrument If the bath is supplied with the optional serial RS 232 interface the inter face cable is attached to the back of the bath at the connector labeled RS 232 If the bath is supplied with the optional IEEE 488 interface then there will be a port labeled IEEE 488 for connection to your IEEE cable 19 User s
2. 58 Problem Causes and Solutions The controller display flashes CUT OUT and the heater does not operate If the display flashes CUT OUT alternately with the correct process tempera ture check the following Wrong cut out setting The cut out disconnects power to the heaters when the bath temperature exceeds the cut out set point This causes the bath tempera ture to drop back down to a safe value If the cut out mode is set to AUTO the heater switches back on when the temperature drops If the mode is set to RE SET the heater only comes on again when the temperature is reduced and the cut out is manually reset by the operator Refer to section 8 8 Check that the cut out set point is adjusted to 10 or 20 C above the desired maximum bath operating temperature and that the cut out mode is set as desired Bad cut out If the cut out activates when the bath temperature is well below the cut out set point or the cut out does not reset when the bath temperature drops and it is manually reset the cut out circuitry may be faulty Try performing the Factory Reset Sequence explained below Factory Reset Sequence Hold the SET and EXIT keys down at the same time while powering up the unit The display shows n the model number and the firmware version Each of the controller parameters and calibration con stants must be re programmed The values can be found on the Report of Cali br
3. 8 CTS To enter the serial parameter pro SNG TING gramming mode first press EXIT while pressing SET and release to Figure 8 Serial Communications Cable enter the secondary menu Press Wiiring SET repeatedly until the display 43 User s Guide 44 10 1 2 1 10 1 2 2 10 1 2 3 10 1 2 4 10 1 3 reads Pr ob E This is the menu selection Press UP repeatedly until the se rial interface menu is indicated with SEr AL Finally press SET to enter the serial parameter menu In the serial interface parameters menu are the BAUD rate the sample rate the duplex mode and the linefeed parameter Baud Rate The baud rate is the first parameter in the menu The display will prompt with the baud rate parameter by showing 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 7009 serial communications may be programmed to 300 600 1200 or 2400 baud The baud rate is pre programmed to 1200 baud Use UP or DOWN to change the baud rate value Press SET to set the BAUD rate to the new value or EXIT to abort the operation and skip to the next parameter in the menu 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
4. Calibration 7009 Calibration Bath User s Guide 7009 ugeng0000 Limited Warranty amp Limitation of Liability Each product from Fluke Corporation Fluke is warranted to be free from defects 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 services are warranted for 90 days The warranty extends only to the original buyer or end user customer of a Fluke authorized reseller and does not apply to fuses disposable batteries or to any other product which in Fluke s opin ion has been misused altered neglected or damaged by accident or abnormal conditions of operation or handling Fluke warrants that software will operate substantially in accordance with its functional speci fications for 90 days and that it has been properly recorded on non defective media Fluke does not war rant that software will be error free or operate without interruption Fluke does not warrant calibrations on the Calibration Bath Fluke authorized resellers shall extend this warranty on new and unused products to end user customers only but have no authority to extend a greater or different warranty on behalf of Fluke Warranty support is available if product is purchased through a Fluke authorized sales outlet or Buyer has paid the applica ble international price Fluke reserves the right to invoice Bu
5. Waters a ai sok pr dee nena ade AS Bi alto dee ce oh eee ee Bok Beare 23 3 1 10 2 Ethylene Glycol 3 ck aca a RR RA ee RU S 23 8 1 10 3 Methanol s a wis eel ob gous dia ot ae aa ea ge ak ee ar AUR ee Roel 23 8 1 10 4 Mineral Oil i23 525 rt yr pbs ae hobs Sw Babs Se ata 28 23 8 1 10 5 Silicone Oll eee A RU woes oboe EA OR RO eee ee 23 8 2 SUMING ch iia oe a DE Que A x cH ED Raa ea a aw 24 8 3 POWER s ea a BS Ga ew er a ey ed oe xw 25 8 4 Heater O rss 26 8 5 COONS 5 e e Ser eub E eee o 26 8 6 Temperature Controller o o dirata 27 9 Controller Operation 29 9 1 Bath Temperat fe s cuco sk eS we RE OX RUR RR o 29 92 Reset Cutout 55 93k a eed a x 29 9 3 Temperature Setpoint llle 31 9 3 1 Prograimmable Set pottt 45 23e a ara RO We a 31 9 3 2 Setpoint Valle ed mates ae om Hace We Be ES ee Yos 32 9 3 3 Setpoint Vernier 4 c gos c om sow aa a aoe AE wen ae ete 32 9 4 Temperature Scale Units 33 9 5 Secondary Menu sse cairo Eg Se 33 9 6 Heater Power x uoo Uw be 9o ew EES 34 9 7 Proportional Band ee A 34 9 8 Cutout co a orum Ree EEE eS ae RE ee A 36 9 9 Controller Configuration o e 37 9 10 Probe Parameters Menu e 37 9 10 1 DO bose hah RE ERS Hew ES a EROS ES 38 9 10 2 Dias Be ds X E GE SOE do x EX em eS 38 9 11 Operating Parameters leen 38 9 11 1 Cutout Reset Mode sug ook Sh
6. 2 50 C 5020 0 7 100 C Mineral Oil No 7 10 C v 166 C fl 168 C 15 75 C 0 87 25 C 0 48 25 C 0 00025 9 0 0007 5 25 C 5011 5 125 C 0 84 75 C 0 53 75 C 25 C 50 C 0 81 125 C 0 57 125 C Silicone Oil Type 40 C v 130 C fl cc 133 C 5 25 C 0 92 25 C 0 4 0 00028 0 00105 1000 25 C 200 05 5010 25 C 10 150 C Silicone Oil Type 30 C v 209 C fl cc 211 C 10 e 25 C 0 934 25 C 0 43 40 C 0 00032 9 0 00108 1000 25 C 200 10 5012 3 135 C 0 45 100 C 25 C 50 150 C 0 482 200 C Silicone Oil Type 10 C v 230 C fl cc 232 C 20 25 C 0 949 25 C 0 370 40 C 0 00034 0 00107 1000 25 C 200 20 5013 0 393 25 C 50 150 C 100 C 0 420 200 C Silicone Oil Type 30 C v 278 C fl cc 280 C 50 25 C 0 96 25 C 0 4 0 00037 0 00104 1000 25 C 200 50 5014 25 C 50 150 C Silicone Oil Type 70 C v 230 C fl cc 232 C 50 70 C 1 07 25 C 0 358 40 C 0 00035 0 00075 100 25 C 550 5016 300 C fl oc 10 104 C 0 386 25 C 1 150 C 100 C 0 433 200 C Silicone Oil Type 80 C v 300 C fl oc 302 C 50 80 C 1 11 25 C 0 363 O 40 C 0 00035 0 00077 100 25 C 710 5017 7 204 C 0 454 25 C 1 150 C 100 C 0 505 200 C Silicone Oil Type 66 C v 313 C fl oc 315 C 50 66 C 0 96 25 C 0 34 Q 0 0003 0 00095 100 25 C 210 H 14 204 C 100 C 1 150 C Heat Transfer 180 C fr 550 C NONE 34 150
7. 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 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 scan ning 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 op eration If during operation the front panel meter indicates excessive cooling this valve is closed partially turn CW until the percentage of heating to cool ing is brought into line It is necessary to wait a few minutes after each adjust ment until the system settles Set the COOLING TEMPERATURE to 5 10 C below the SET TEMPERA TURE for near ambient and below operation For temperature above 16C set the COOLING TEMPERATURE at 7 C The cooling temperature should NOT be set abov
8. and tj and measuring the errors again If desired the calibration procedure may be repeated again to fur ther improve 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 DO and DG are 25 229 and and 75 00 C The measured bath tempera tures are 24 869 and 74 901 C respectively Refer to Figure 9 for applying equations to the example data and computing the new probe constants Bath Calibration DO 25 229 DG 0 0028530 tj 25 00 C measured t 24 869 C ty 75 00 C measured t 74 901 C Compute errors erry 24 869 25 00 C 0 131 C erry 74 901 75 00 C 0 099 C Compute Co _ 0131 75 0 25 229 0 099 25 0 25 229 n 25 229 25392 750 25 0 Compute Cc ps 70099 COTS 0 0028530 0 028548 75 0 25 0 Figure 9 Sample calibration computations 53 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 instrument in dirty or dusty environments A battery is used to maintain operating parameters in the unit All operat ing par
9. 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 the General Operation section Section 8 for more information about the different types of flu ids 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 life time 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 55 User s Guide 56 12 1 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 call a Fluke Calibration Authorized Service Center for more in formation Before using any cleaning or decontamination method except those rec ommended
10. 203 257 VAC Voltage Cut In 7 5 213 247 VAC Fluke Authorized Service Centers Please contact one of the following authorized Service Centers to coordinate service on your Fluke product Fluke Calibration 799 E Utah Valley Drive American Fork UT 84003 9775 USA Phone 1 801 763 1600 Telefax 1 801 763 1010 E mail support Flukescientific com Fluke Nederland B V Customer Support Services Science Park Eindhoven 5108 5692 EC Son NETHERLANDS User s Guide Phone 31 402 675300 Telefax 31 402 675321 E mail ServiceDesk G 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 5 12 3436 Telefax 86 10 6 5 12 3437 E mail xingye han fluke com cn Fluke South East Asia Pte Ltd Fluke ASEAN Regional Office Service Center 60 Alexandra Terrace 03 16 The Comtech Lobby D 118502 SINGAPORE Phone 65 6799 5588 Telefax 65 6799 5588 E mail antngOsinga fluke com When contacting these Service Centers for support please have the following information available e Model Number e Serial Number e Voltage e Complete description of the problem Introduction Introduction The Fluke Calibration 7009 is a very precise constant temperature bath An in novative state of the art solid state temperature controller has been incorporated which maintains the bath temperature with
11. 4 3 Setting the Temperature sec 2 ee ee 11 5 Installation s oa Moo wx eo dec Xo De ae DEC 13 5 1 Unpackthg als d Ra eye SRS OR E eu SITE ee 13 5 2 Bath Environment 13 3 3 Bath Preparation and Filling o 13 5 4 PROD sena Ghoti ok ae ee a ees Be dn eB ae e O a 14 5 5 POWELL E A s xu ced HSE EE VE des 14 6 Bath Use os s kon ox Rx eee a 15 6 1 General us stan gee Bsa tec He ed ns se Se xeu ko y Vb o 15 6 2 Comparison Calibration o 15 6 3 Calibration of Multiple Probes leen 16 7 Parts and Controls 17 7 1 Front Control Panel 17 72 Side Panel ee ee 18 7 3 Back Panel oia ed aa a ex 19 8 General Operation 21 ii 8 1 Bath Elnda iu ore Rm Sak AE ee RE GRUT Ree RE 21 8 1 1 Temperature Range 2 dde und d veremos UR eh ee ae Rar E 21 8 1 2 VISCOS PI ET 21 8 1 3 Specific Heat sss os eR vp tee e rb lw eR Ee We eal ee A 21 8 1 4 Thermal Conductivity 4 e oe Rm Rmo mc eR 6 Re meus en 22 8 1 5 Thermal Expansion sns xg gy cens gym Ier AGRAR ere e d eu 22 8 1 6 Electrical Conduc vity s cd kk REG Pee See oe ERG 22 8 1 7 Fluid lifetime PP Be A we ae Hh Tc 22 8 1 8 Safety xs dopo Glade Ren Puede hod mex d deer e edes Glade qu 22 8 1 9 COSI e scu dur dae ie de d ad inue qud duni euet ew ies veis 22 8 1 10 Commonly Used Fl ids 4 3 Wa kms a s BS we PAS GMS Bohs 22 SAA
12. Freeze Point PP Pour Point Black area represents liquid range with excessive viscosity Range over which a fume hood is recommended SS Decomposition Starts NET Legend EET Shaded area represents usable range of fluid starting at BP Boiling Point 50 centistokes Lighter shading represents decreasing CS Centistokes Figure 5 Chart of various bath fluids and their properties 8 2 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 24 General Operation Table 2 Table of various fluids and their properties Fluid Lower Upper Thermal Thermal Fluke Part Temperature Temperature Flash Viscosity Specific Specific Heat Conductivity Expansion Resistivity No Limit Limit Point centistokes Gravity cal g C cal s em C cm cm C 10 0 cm Halocarbon 0 8 100 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 10 C fl cc 12 C 1 3 35 C 0 810 0 C 0 6 0 0005 0 0014 0 66 0 C 0 792 20 C 20 C 25 C 0 45 20 C Water 0 C fr 95 C b NONE 1 25 C 1 00 1 00 0 0014 0 0002 0 4 75 C 25 C Ethylene S30 C fr 90 C b NONE 7 0 C 1 05 0 8 9 0 C 0 001 Glycol 50
13. accuracy of better than 0 1 C over a range of 50 degrees Calibration Points In calibrating the bath DO and DG 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 will be ob tained when using bath temperatures which are just within the most useful op erating range of the bath The farther apart the calibration temperatures the larger will be the calibrated temperature range but the calibration error will also be greater over the range If for instance 20 C and 80 C are chosen as the cali bration temperatures then the bath may achieve an accuracy of say 0 2 C over the range 20 to 80 C Choosing 30 C and 70 C may allow the bath to have a better accuracy of maybe 0 05 C over the range 30 to 70 C but outside that range the accuracy may be only 0 5 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 setpoint which we will call tj 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 mea sure the bath temperature with the thermometer and compute the temperature error err which is the actual bath temperature minus
14. extreme stability 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 The tank for the 7009 is stainless steel and holds 157 liters Figure 1 Bath Assembly Specifications and Environmental Conditions 3 1 3 2 Specifications and Environmental Conditions Specifications Range 0 C to 110 C 32 F to 230 F Soft cutoutt 50 C Stability at 25 C 0 0007 C water 0 001 C mineral oil 5011 Temperature Setting Digital display with push button data entry Set point Resolution 0 002 C high resolution mode 0 00003 C Display Resolution 0 01 C Digital Setting Accuracy 1 C Digital Setting Repeatability 0 01 C Heaters 500 and 1000 Watts Cooling Capacity 100 200 Watts Refrigeration 1 3 Hp Access Opening 69 9 cm X 55 9 cm 27 5 X 22 Bath Chamber Dimensions unobstructed space 55 9 cm H X 69 9 cm W X 33 0 cm D 22 X 27 5 X 13 Depth 33 1 cm 13 Wetted Parts 304 stainless steel Safety Cutout Factory set high temperature Power 230 VAC 10 60 Hz 12 amps single phase 50 Hz optional Volume 167 liters 44 gallons Weight 150 kg 330 Ib Size 109 2 cm H X 113 cm W X 86 4 cm D 43 X 44 5 X 34 Safety O
15. 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 Mi 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 Siasbeusugenusaeseasaunenacesenasenes Add ee Current IEEE 488 interface address Adjust the value with UP or DOWN and then use SET to set the address to the displayed value Add 15 New IEEE 488 interface address ped Calibration Parameters The operator of the bath controller has access to a number of the bath calibra tion constants namely CTO H and L These values are set at the factory and must not be altered The correct values are important to the proper and safe op eration of the bath Access to these parameters is available to the user only so that in the event that the controller s memory fails the user may restore these values to the factory settings The user should have a list of these constants in the Report of Test sent with the bath 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 parame
16. 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 OC to a few degrees below 100C At higher temperatures evaporation becomes significant Water used in the bath should be distilled or softened to prevent mineral deposits Consider using an algicide chemical in the water to prevent contamination Ethylene Glycol The temperature range of water may be extended by using a solution of 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 alchohol is often used at low temperatures below OC 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 signif
17. parameters menu 37 User s Guide 38 9 10 1 9 10 2 9 11 9 11 1 Press SET to enter the menu The probe parameters menu contains the pa rameters DO and DG which characterize the transfer function of the linearized thermistor control probe These parameters may be adjusted to improve the ac curacy of the bath This procedure is explained in detail in Chapter 10 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 will cause the parameter to be skipped ignoring any changes that may have been made DO This probe parameter refers to the temperature at which the control probe out put would be 0 Normally this is set for 25 229 DG This probe parameter refers to the temperature span of the probe between 0 and 100 output Normally this is set for 186 974 Operating Parameters The operating parameters menu is indicated by PAr i Operating parameters menu pend 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
18. rate is set to 5 for instance then the 1502 will transmit the current measurement over the serial interface approximately every five seconds The automatic sampling is disabled with a sample period of 0 Press SET to choose to set the sample period Ad just the period with UP or DOWN and then use SET to set the sample rate to the displayed value Duplex Mode The next parameter is the duplex mode indicated with 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 will be immediately echoed or transmitted back to the device of origin With half duplex the commands will be executed but not echoed The default setting is full duplex The mode may be changed using UP or DOWN and pressing SET Linefeed The final parameter in the serial interface menu is the linefeed mode This pa rameter enables n or disables 8 FF transmission of a linefeed charac ter LF ASCII 10 after transmission of any carriage return The default setting is with linefeed on The mode may be changed using UP or DOWN and pressing SET Serial Operation Once the cable has been attached and the interface set up properly the control ler will immediately begin transmitting temperature readings at the pro grammed rate The set point and other commands may be sent to the
19. response time Otherwise the temperature may begin to oscillate Specific Heat Specific heat is the measure of the heat storage ability of the fluid Specific heat though to a lesser degree also affects the control stability It also affects 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 com pensate for the decrease in sensitivity of the bath temperature to heat input 21 User s Guide 22 8 1 4 8 1 10 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 Conductivity In some applications such as measuring the resistance of bare temperature sen sors it may
20. the bath temperature set point proceed as follows The front panel LED display normally shows the actual bath temperature Bath temperature display When SET is pressed the display will show the set point memory that is cur rently being used and its value Eight set point memories are available 11 User s Guide 12 SET Access set point selection I 85 0 i Set point 1 25 0 C currently used Press SET to select this memory and access the set point value SET Access set point value GG i Current value of set point 1 25 00 C Press SET to accept the new value and display the vernier value The bath be gins heating or cooling to the new set point Store new set point access vernier 0 00000 i Current vernier value Press EXIT and the bath temperature will be displayed again Return to the temperature display The bath will heat or cool 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 point temperature be careful not to exceed the temperature limit of the bath fluid The over temperature cutout should be correctly set to prevent this from happening See Section 8 8 If operating the bath below 45 C set the COOLING power switch to ON The cooling temperature may
21. C 2 00 150 C 0 33 0 0014 0 00041 1 7 Q cm Salt 6 5 300 C 1 9 300 C 5001 2 4 500 C 1 7 500 C Limiting Factors b boiling point 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 8 3 Power Power to the bath is provided by an AC mains supply See Section 3 1 Specifi cations for power details Power to the bath passes through a filter 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 25 User s Guide 26 8 4 8 5 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 will briefly show a four digit num ber This number indicates the number of times power has been applied to the bath Also briefly displayed is data which indicates the controller hardware configuration 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
22. E 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 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 Subject to change without notice e Copyright 2010 Printed in USA Table of Contents 1 Before You Start uc 4 see ee ra mw XR as 1 1 1 symbols Used 2b aa ees Roe RU as OOS 1 1 2 Safety Information s cap ia poeta ee a E a r 2 1 2 1 Warnes s ms Ses verre 2 1 3 2 amp nn o A A de A o e Ad ac E 4 1 3 Fluke Authorized Service Centers 5 2 Introduction ico a a ia ee 7 3 Specifications and Environmental Conditions 9 3 1 Specifications cuo s poem oko eR RUE Rx E Rom E a RD S 9 3 2 Environmental Conditions cle 9 4 QuickStart uou hwo ood a oe ee Ed UR 11 4 1 SetUp 6 4 06 29 e eR Rd A howd Gan 11 4 2 POWEGED x uei Seton a da a o SR ee mE 11
23. Guide in IEEE 488 Qu D 8 o L er B Figure 4 Back Panel A WARNING Extreme care must be taken to prevent harm to the user or the surrounding environment Do not exceed a 120 C fluid temperature 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 9 A drain valve is provided for ease of removing the fluid media from the bath It is advisable to use a container of adequate size to hold the full load of fluid Some oils are more easily drained at higher temperatures 10 The SYSTEM FUSES not shown are located inside the cabinet If the fuse needs to be replaced contact a service center for assistance 20 General Operation 8 1 General Operation Bath Fluid Many fluids will work with 7009 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 conductivity 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 temperatur
24. Interface Command Summary lll lle 46 Interface Command Summary continued 47 Temperature Range Control Functions 49 Serial Power Control Functions o o 49 Before You Start 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 MA CE Complies with European Union Directives DC Double Insulated Electric Shock Fuse PE Ground Hot Surface Burn Hazard Read the User s Manual Important Information Off On O I ei User s Guide Symbol Description Canadian Standards Association us CATI 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 The European Waste Electrical and Electronic Equipment WEEE Directive C TIC Australian EMC Mark i 2002 96 EC mark 1 2 Safety Information Use this instrument only as specified in this manual Otherwise the protection provided by the instrument may be impaired The following defini
25. OWN UP and EXIT are used to set the bath temperature setpoint access and set other operating parameters and access and set bath calibration parameters A brief description of the functions of the buttons follows SET Used to display the next parameter in a menu and to set parameters to the displayed value DOWN Used to decrement the displayed value of settable 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 the heater is on and when it is green the heater is off and the bath is cooling 7009 HIGH PRECISION BATH 4 O HEATING COOLING HEATER MODE SET DOWN UP e Figure 2 Front Controller Panel 17 User s Guide 7 2 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 NOTE Be sure the Cooling Power Switch see Figure 2 is in the OFF 0 position when the unit is turned ON Repeatedly turning the u
26. SET Y EXIT AdjustVernier EXIT I SET j EXIT Set Scale C F Configuration Menu 4 SET SET A A i A A EXIT EXIT EXIT i EXIT EXIT e H Operating uP Serial ue gt IEEE 488 ue TAM prise I DOWN Parameters lt Ipown Interface DOWN Interface 4 pows Calibration 1 a Menu Pu Menu lt SET SET SET SET E ser X 5 Y Y Y Y i gt Y Cutout BAUD i Device i Do Reset Mode O Fate Address i E cTo SET EXIT SET EXIT SET EXIT SET EXIT gt gt ww ser EXIT Tu Adj Cutout Adjust Adj Device e I H I 1 I SEDEXIT SET EXIT SET EXIT i SET EXIT E SET EXIT E Sample gt DG Period 1 IEEE 488 i i SET Ex SET EXIT Option Installed Ww set Lar athe HOSEL de E Adj Sample Lu Period o z I SET EXIT SET EXIT q SET EXIT Cd x o Duplex Mode o SET EXIT Z se EXIT gt 8 Adj Duplex Adjust L SET EXIT SET EXIT Linefeed j SET EXIT gt Linefeed SET EXIT p Figure 6 Flowchart showing the various menu options 30 Controller Operation 9 3 9 3 1 Press SET once more to reset the cutout Reset cutout This will also switch the display to the set temperature function To return to displaying the temperature press the EXIT button If the cutout is still in the over temperature fault condition the display will continue to flash cutout The bath temperature must drop a few degrees below the cutout set point be fore t
27. VERVOLTAGE Installation CATEGORY Il Pollution Degree 2 per 1EC1010 1 tThe soft cutout of the instrument has been set at the factory to 50 C to protect standard resistors placed in the bath In order to use the bath for other calibration purposes the user should insure that the soft cutout is adjusted appropriately for the application 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 e Ambient temperature range 5 50 C 41 122 F User s Guide ambient relative humidity maximum 80 for temperature lt 31 C de creasing linearly to 50 at 40 C pressure 75kPa 106kPa mains voltage within 10 of nominal vibrations in the calibration environment should be minimized altitude less than 2 000 meters indoor use only Quick Start 4 1 4 2 4 3 Quick Start This chapter gives a brief summary of the steps required to set up and operate the 7009 bath This should be used as a general overview and reference and not as a substitute for the remainder of the manual Please read Section 8 carefully before operating the bath Set Up Set up of the bath require
28. ameters 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 If 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 to the viscosity of the fluid A significant change in the viscosity can indicate that the fluid is contaminated being used out
29. and Description Format Example Returned Example Values Set cutout to be reset manually cm ode r eset cm r 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 to n sa mple n sa 0 0 to 4000 seconds Set serial duplex mode du plex t ull h alf FULL or HALF Set serial duplex mode to full du plex f ull du f Set serial duplex mode to half du plex h alf du h Set serial linefeed mode If eed on of f ON or OFF Set serial linefeed mode to on Iffeed on If on Set serial linefeed mode to off If eed of f If of Calibration Menu Warning Changing the calibration values may change the instrument accuracy 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 Legend Optional Command data Returns either information n Numeric data supplied by user 9 Numeric data returned to user x Character data returned to user Note When DUPLEX is set to FULL and a command is sent to READ the command is returned followed by a carriage return and linefeed Then the value is returned as indicated i
30. are available from Fluke Calibration and other sources Depending on the desired temperature range any of the following fluids as well as others may be used in the bath e Water e Ethylene Glycol Water e Methanol e Mineral oil 13 User s Guide 5 4 5 5 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 access hole to a level that will allow for stirring and thermal expansion The fluid should never exceed a height of 1 2 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 nec essary and with caution if the fluid is hot Be careful to prevent bath fluid from spilling on the stirring motor while filling Note that underfilling may reduce bath performance and may possibly damage the bath heater Probe Inspect the bath controller probe It should not be bent or damaged in any way Reasonable caution should be used in handling this probe as it contains a preci sion platinum sensor and is mechanically shock sensitive Dropping 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 replaced Contact a Fluke Calibration Authori
31. atch 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 commands 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 45 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 999 99 C or F set 150 00 C Set current s
32. ation that was shipped with the instrument The display flashes CUT OUT alternately with an incorrect process temperature Low battery A problem could exist with the memory back up battery If the bat tery voltage is insufficient to maintain the memory data may become scrambled causing problems A nearby large static discharge may also affect data in mem ory Access the battery by removing the L shaped panel covering the display electronics Corrupt controller memory If the problem reoccurs after the battery is re placed initialize the memory by performing a Factory Reset Sequence de scribed in a previous solution The controller displays the wrong temperature and the bath continually heats or cools regardless of the set point value Bad control probe The bath control probe may be disconnected burned out or shorted Check first that the probe is connected properly to the socket in the rear of the bath labeled PROBE 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 The resistance should read 0 2 to 2 0 ohms between pins 1 and 2 on the probe connector and 0 2 to 2 0 ohms be tween pins 3 and 4 The resistance should read from 100 to 300 ohms between pins 1 and 4 depending on its current temperature Corrupt controller memory Initialize the memory by performing a Factory Re set Sequence described in a previous solution Troubleshoo
33. aw puo Soda eM Ew yea ge 38 9 12 Serial Interface Parameters 2 000 4 39 9 12 1 BAUD Rate y cae a a o a et A wh dd d BA a 39 9 12 2 sample Period s 0er A BSS oS 39 9 12 3 Duplex Mode psi ae od eecbece duo die d ed wee wine 40 9 12 4 Linefe ed o aono RO ene Re a p ea A ARGUS 40 9 13 IEEE 488 Parameters Menu 00 41 9 13 1 IEBE 488 Address 1 2 es 41 9 14 Calibration Parameters lll len 41 9 14 1 A 42 9 14 2 Hands aat to Be sks ok tem tres ond doe ibe dario by Lf UE p emere Beck ose un 42 9 15 Command Summary lt s so seese seto eedu Sea 42 10 Digital Communication Interface 43 10 1 Serialcommunications e 43 10 1 1 Watts sa Xa a A D XR Wards A WA EOD Bae A 43 10 1 2 CUP ed aol a BM Mee eor X Nue ge xor el ede obs 43 10 1 2 1 Baud Rate i26 ai als da es ee HAG ee EROR tte dosed E Rn 44 10 1 2 2 Sample Period ous cua osos s hem oret eite gp Ro ec LS Rel PY EL ene 44 10 1 2 3 Duplex Mode uoo Rr Boe BR e RR Red bons RU or E arm Um oes 44 10 2 A A teo deer WC Xe Yee kate aee dere er laude eo erties 44 10 1 3 Serial Operation 3x ue R4 DUROS EON ECADA Hop E ded ER e 44 10 2 JEEE 488 communication optional 45 10 2 1 SETUP aa Pa aa hoe A wie we d 45 10 2 1 1 IEEE 488 Interface Address ios rk a t eo 45 10 2 2 TEEE 488 Operation o oo t m 45 10 3 InterfaceCommands o soscada ee lll 45 10 4 Power Con
34. bath via Digital Communication Interface 10 2 10 2 1 10 2 1 1 10 2 2 10 3 the serial interface to set the bath and view or program the various parameters The interface commands are discussed in Section All commands are ASCII character 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 Setup To use the IEEE 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 The IEEE 488 interface parameters menu is outlined in Figure 6 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 AddrESS Press SET to program the address The default address is 22 Change the device address of the bath if necessary to m
35. be important that little or no electrical leakage occur through the fluid In this case consider a fluid with very low electrical conductivity or 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 Fluids may be hazardous Contact with eyes skin or inhalation of vapors may cause injury A proper fume hood must be used if hazardous or bothersome vapors are pro duced Fluids may be flammable and require special fire safety equipment and procedures Hazardous fluids require special disposal according to applicable 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 and in the following chart and table are descriptions of some of the more commonly used fluids and their characteristics General Operation 8 1 10 1 8 1 10 2 8 1 10 3 8 1 10 4 8 1 10 5 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
36. by Fluke users should check with a Fluke Calibration Autho rized Service Center 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 cut out should be checked every 6 months to see that it is working properly In order to check the user selected cut out fol low the controller directions Section 8 8 for setting the cut out Both the manual and the auto reset option of the cut out should be checked Set the bath temperature higher than the cut out Check to see if the display flashes cut out and the temperature is decreasing A CAUTION When checking the over temperature cut out 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 Draining the Bath The drain is located on the back of the bath See Figure 4 Back Panel Locate the drain plug on the end of the drain tube This drain plug is to be fluid tight until the bath is drained The following information is helpful when draining the bath ile Always use a container capable of holding the entire load of fluid Use safety equipment as appropriate Drain water and low viscosity fluids at room temperature Normal care must be taken for fluids that may have corrosive
37. cess 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 kept 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 Parts and Controls 7 Parts and Controls 7 1 Front Control Panel The following controls and indicators are present on the controller front panel see Figure 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 various bath functions settings and constants The display shows temperatures in values ac cording to the selected scale units C or F 2 The control buttons SET D
38. connect the AC power and power on the instrument 4 If the display shows InIT and or the cycle count shows a low number such as 0002 the battery is spent and should be replaced Contact a Fluke Calibration Authorized Service Center for assistance 5 After replacing the battery you must reprogram the calibration and user ad justable parameters into the controller
39. e 7 C or 90 psig About 45 C the refrigeration will not be required as there is sufficient cooling to the room Wait a few minutes after each adjust ment until the system establishes itself Readjust if required after settling for a while For maximum cooling for slewing to lower temperatures the BACK PRES SURE valve should be fully open and the COOLING TEMPERATURE set to 0 C Readjust higher or lower as required after set temperature is reached General Operation 8 6 Temperature Controller The bath temperature is controlled by Fluke Calibration 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 microcontroller will automatically turn off the heater with a second mechanical relay anytime the bath temperature is more than a certain amount above the set point temperature As a second protection device the controller is also
40. e adjusted for approximately 56 psi when the valve is closed Table 6 Serial Power Control Functions Function Command 0 1 Heater F1 low high Refrigeration F2 off on Expansion valve F3 open closed Back pressure FA open closed The F4 command controls the back pressure valve When the valve is closed the cooling capacity will be significantly reduced This valve should normally be left open throughout the operating range of the bath Table 6 summarizes the control functions for heating and cooling Table 5 shows the recommended control settings for each operating temperature range The ranges may need to be adjusted depending on the bath and its particular use Table 5 Temperature Range Control Functions Range Heater Refr Expans 10 to 15 C low on open 15 to 40 C low on closed 40 to 110 C low off closed 49 Bath Calibration 11 11 1 11 2 11 3 Bath Calibration 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 DO and DG 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
41. e at which the bath is operated must always be within the safe and useful temperature range of 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 Evaporization 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 cutout 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
42. eater with the digital interface the front panel heater switch must be set to LOW 250 W The heater function is controlled with a the F1 command Setting the parameter to 0 sets the heater to LOW 250 W and set ting it to 1 sets the heater to HIGH 1000 W Sending F1 with no value will cause the controller to return a value showing what the heater setting is When the heater setting is changed a pop will be 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 will return 0 or 1 showing the state of the refrigeration power control The F3 command controls the cooling temperature or expansion valve As discussed in section 8 5 this valve adjusts the cooling temperature which sets the cooling capacity Setting F3 to O opens the valve and 1 closes the valve A command with no value will return the current value With the valve open the cooling temperature is set with the cooling temperature knob labeled LOW This should be adjusted for approximately 5 psi if the bath is to be used as low as 10 C The knob labeled HIGH controls the cooling temperature when the Digital Communication Interface expansion valve is closed This should b
43. equipped with a separate thermocouple temperature monitoring circuit which will shut off the heater if the temperature exceeds the cutout set point The controller allows the operator to set the bath temperature with high resolu tion set the cutout 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 an 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 Operation using the digital interfaces is dis cussed in Section When the controller is set to a new set point the bath will heat or cool 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 overshoot or undershoot of about 0 5 C 27 Controller Operation 9 1 9 2 Controller Operation This chapter 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 deg
44. erature 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 effect from different types of probes is not to tally eliminated Even though all baths have horizontal and vertical gradients 15 User s Guide 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 Fluke Fluke Scientific 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 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 complicated as a specially de signed 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 ac
45. ess the proportional band Access heater power in secondary menu a To accept the new setting and access the cutout set point press SET Pressing EXIT will exit the secondary menu ignoring any changes just made to the proportional band value 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 will shut 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 below 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 will be shut off and the bath will cool The bath will cool until it reaches a few degrees below the cutout set point temperature At this point the action of the cutout 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 then the cutout
46. et 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 9 999 pr 1 59 Set proportional band to n pr op band n pr 0 061 Depends on Configuration Read cutout setting c utout c c 9999 x Xxx c 100 C in Set cutout setting c utout n r eset Set cutout to n degrees c utout n c 100 Temperature Range Reset cutout now c utout r eset c r Read heater power po wer po po 999 po 1 duty cycle up to 100 Configuration Menu Probe Menu Read DO calibration parameter d0 d0 d0 99 999 d0 25 299 Set DO calibration parameter ton d0 n d0 25 299 999 9 to 999 9 Read DG calibration parameter dg dg dg 999 99 dg 186 974 Set DG calibration parameter ton dg n dg 186 974 999 9 to 999 9 Operating Parameters Menu Read cutout mode cm ode cm cm xxxx cm AUTO Set cutout mode cm ode r eset a uto RESET or AUTO 46 Digital Communication Interface Interface Command Summary continued Command Command Returned Acceptable Comm
47. for specific information on bath fluids and Section 9 8 Cutout 1 2 2 A Cautions To avoid possible damage to the instrument follow these guidelines Always operate this instrument at room temperature between 41 F and 122 F 5 C to 50 C Allow sufficient air circulation by leaving at least 6 inches 15 cm of clearance around the instrument When filling the tank ensure the immersion coils are completely covered DO NOT overfill the bath Overflowing fluid may damage the electrical system See Section 5 3 Bath Preparation and Filling for specific instruc tions Read Section 6 Bath Use before placing the bath into service DO NOT turn the bath on without fluid in the tank and the heating coils fully immersed DO NOT change the values of the bath calibration constants from the fac tory 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 personnel 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 pa rameters DO NOT operate this instrument in an excessively wet oily dusty o
48. g the cooling on setting the cooling pressure to approximately 7 PSI and setting the cooling temperature to 10 15 C below the bath set point The bath should then cool as quickly as possible to the new set point Insufficient cooling This may be caused by lack of refrigerant because of a leak in the system 59 User s Guide 60 Problem Causes and Solutions Power Up The unit is equipped with external operator accessible fuses If a fuse blows it may be due to a power surge or failure of a component Replace the fuse once DO NOT replace the fuse with one of a higher current rating Always replace the fuse with one of the same rating voltage and type If the fuse blows a second time it is likely caused by failure of a component part Contact a Fluke Calibra tion Authorized Service Center Section 1 3 for assistance The controller does not maintain controller pa rameters or parameters 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 instrument 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 Re
49. he 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 shown at the left on the display followed by the current set point value e5 00 j Bath temperature in degrees Celsius pd NLMPRRREISSSRSRARARAHISEAERSERRERESE 4 340 0 j New set point memory 4 40 0 C Press SET to accept the new selection and access the set point value Accept selected set point memory 31 User s Guide 32 9 3 2 9 3 3 Set point Value The set point value may be adjusted after selecting the set
50. icant The vapors may be dangerous and use of a fume hood is highly recommended As with most oils mineral oil will expand as temperature increases so be careful not to fill the bath too full that it over flows when heated The viscosity and thermal characteristics of mineral oil is poorer than water so temperature stability will not be as good Mineral oil has very low electrical conductivity Use caution with mineral oil since it is flam mable 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 These oils are more expensive as well For information on silicone oils contact Fluke Calibration 23 User s Guide Silicone Oil 5017 Silicone Oil 5014 Silicone Oil 5013 Silicone Oil 5012 Silicone Oil 5010 HFE 7500 5023 Halocarbon 5019 Mineral Oil 5011 Water Methanol Ethanol Ethylene Glycol 50 50 with H20 5020 Dynalene HF LO 5022 Bath Salt 5001 100 C 0 C 100 C 200 C 300 C 400 C 500 C 600 C FL 302 C FL 280 C 10CS FL 232 C E FL 211 C MES FL 133 C P 100 C FL 177 C viscosity while vaporization and decomposition increase EP Evaporation Point fluid loss due to evaporation FL Flash Point FR
51. is indicated by CEor5E Cutout reset mode parameter seta on Press SET to access the parameter setting Normally the cutout is set for manual mode Controller Operation 9 12 9 12 1 9 12 2 Serial Interface Parameters The serial RS 232 interface parameters menu is indicated by SErIRL 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 de termines the serial communications transmission rate The BAUD rate parameter is indicated by BAU i Serial BAUD rate parameter Press SET to choose to set the BAUD rate The current BAUD rate value will then be displayed 1200 b Current BAUD rate The 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 i New BAUD rate Press SET to set the BAUD rate to the new value or EXIT to abort the op eration 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 mea
52. it is displayed 8 000880 j New vernier setting NESIRsSRESRRRRESSASEBRPERERSERRARREE Next press EXIT to return to the temperature display or SET to access the temperature scale units selection Access scale units Controller Operation 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 The units will be 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 o Ai Sigs tassuscaGaseanagsuperscauenaseues D AAA B AA ped Press SET to accept the new selection and resume displaying the bath temperature Set the new units and resume temperature display Secondary Menu Functions which are used less often are accessed within the secondary menu The secondary menu is accessed by pressing SET and EXIT simultaneously and then releasing The first function in the secondary menu is the heater power display See Figure 6 33 User s Guide 34 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 b
53. itionally the bath can be left energized 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 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 temp
54. l flash cutout until the user resets the cutout To access the re set cutout function press the SET button Access cutout reset function The display will indicate the reset function Cutout reset function 29 User s Guide T end Secondary Functions emperature p gt SET EXIT Y A AA AAA EXIT Display Power Y I EXIT Reset Cutout Ja SET 1 Y l Cutout Active SET e EXIT Set Proportional Band ARA E SERIES 1 I Y SET 4 EXIT Select Setpoint Y SET EXIT Set Cutout Temp SET EXIT Adjust Setpoint I
55. led in accordance with local codes and ordinances Consult a qualified electrician DO NOT use an extension cord or adapter plug e 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 e Always replace the power cord with an approved cord of the correct rat ing and type If you have questions contact a Fluke Fluke Calibration Au thorized Service Center see Section 1 3 e 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 User s Guide BATH FLUIDS Fluids used in this bath may produce noxious or toxic fumes under certain circumstances 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 oper ation Ensure that the soft cutout is adjusted to the fluid characteristics of the application 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 Heat Transfer Fluid
56. n the RETURNED column 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 T are optional for the command A slash denotes alternate characters or data Numeric data denoted by ZSEE may be entered in decimal or exponential notation Bold type characters are literal characters while normal type symbol 47 User s Guide 48 10 4 10 4 1 10 4 2 izes data 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 The 7009 bath has four control functions with the digital interface These are heater power high low cooling on off ex pansion valve open closed and back pressure valve open closed Heater Control To control the h
57. ng Wrong proportional band setting If the proportional band is set too narrow the bath will oscillate causing poor stability In this case increase the width of the proportional band If the proportional band setting is too wide the long term stability of the bath is affected In this case decrease the width of the band Refer to section 9 7 Bath fluid is too thick Make sure that the bath fluid used is less than 50 centi Stokes 10 is ideal at the temperature at which the bath is controlling Check the fluid manufacturer s specifications You should also change the bath fluid regularly and if it changes colors or be comes too thick Bad control probe Check that the control probe has not been struck bent or damaged Refer to the previous solution for how to check the probe s resistance The controller alternately heats for a while then cools Wrong proportional band setting If the proportional band is set too narrow the bath will oscillate between too much heating and too much cooling causing instability Increase the width of the proportional band until the temperature sta bilizes Refer to section 9 7 The bath does not achieve low temperatures Too much heating Check that the control indicator glows green showing that the controller is attempting to cool The heaters may be disabled as a test by temporarily removing the heater fuses Check the refrigeration system by switching the heater to low switchin
58. nit on with the Cooling Power Switch in the ON position may dam age the System Fuse 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 COOL ING TEMP gauge With the interface option an extra cooling valve HIGH is provided 1 The BACK PRESSURE valve adjustment is used to control the amount of cooling supplied to the system This valve reduces the cooling capac ity by restricting the flow of refrigerant to the bath allowing the adjust ment of the heating to cooling percentage Under normal operation the valve should be fully open counter clockwise 2 The COOLING TEMPERATURE regulating valve is used to adjust the temperature at which the refrigerant evaporates which determines cool ing efficiency The ideal temperature for operation is about 5 10 degrees Celsius below the desired bath temperature Refer to label below gauge for approximate psi and evaporative temperature settings The table from the label is reproduced below Cooling Temperature El Back Pressure Low High O C e o o a Le La Figure 3 Side panel controls e Parts and Controls 7 3 For this bath Set the Cooling Temp Valve Control Temperature to this pressure Nominal Cooling PSIG 47 9 2 14 5 20 7 27 9 36 1 45 5 56 2 DO NOT set the Cooling Pressure above 90 PSIG
59. or damaging effects on the surrounding facility or equipment High viscosity oils should be sufficiently low in viscosity to drain effec tively Some oils such as 710 silicone oil may need to be heated to 80 C to drain well The viscosity affects how rapidly it drains as well as how well it flows off of the walls Appropriate temperature resistant contain ers and appropriate safety equipment such as face shields gloves and body covering should be used Troubleshooting 13 13 1 Troubleshooting In the event the bath appears to function abnormally this section may help to find and solve the problem Several possible problem conditions are described along with likely causes and solutions If a problem arises please read this sec tion carefully and attempt to understand and solve the problem If the bath seems faulty or the problem cannot otherwise be solved then contact a Fluke Calibration Authorized Service Center for assistance Troubleshooting Problem Causes and Solutions The bath does not turn on and the display re mains blank If a fault condition exists upon application of power the bath will not energize The bath needs to be plugged in to the line voltage for at least 10 minutes be fore turning power on This is only necessary for the first time that the bath is energized or when it is moved from one location to another If a high or low voltage condition exists for longer than 5 seconds the compres so
60. 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 Table 3 Proportional Band Fluid Table Heater Setting Proportional Fluid Temperature Band Stability Water 30 0 C Low 0 04 C 0 0004 C Water 60 0 C Low 0 04 C 0 001 C Eth Gly 50 35 0 C Low 0 05 C 0 0005 C Eth Gly 50 60 0 C Low 0 05 C 0 001 C Eth Gly 50 100 0 C High 0 4 C 0 007 C Oil 35 0 C Low 0 1 C 0 003 C Oil 60 0 C Low 0 2 C 0 002 C Oil 100 C Low 0 2 C 0 003 C 35 User s Guide 36 9 8 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 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 press SET to acc
61. point memory and pressing SET The set point value is displayed with the units C or E at the left C 40 060 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 C 42 50 j 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 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 from 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 i 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
62. r dirty environment Most probes have handle temperature limits Be sure that the probe handle temperature limit is not exceeded in the air above the instrument The instrument and any thermometer probes used with it are sensitive in struments that can be easily damaged Always handle these devices with care Do not allow them to be dropped struck stressed or overheated Before You Start 1 3 COLD BATHS e Refrigerated baths require that the condensing coil be cleaned periodi cally Accumulation of dust and dirt on the condenser will result in pre mature failure of the compressor e This bath has been equipped with a brownout and over voltage protection device as a safety feature to protect the system components e 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 an other Turning the bath ON or OFF does not trigger the delay e Ifa High Low voltage condition exists for longer than 5 seconds the bath de energizes An amber indicator on the back panel lights when this con dition exists e Re energization is automatic upon correction of the fault condition and af ter a delay cycle of about 2 minutes If a fault condition exists upon appli cation of power the bath will not energize e Under and Over Voltage Protection at 230 VAC Voltage Cutout 12 5
63. r is de energized and the Mains Out of Range light on the back panel illumi nates indicating a fault condition Re energization is automatic upon correction of the fault condition and after a delay cycle of about 10 minutes High and low voltage protection limits at 230 VAC Voltage Cut out 12 5 203 257 VAC Voltage Cut in 7 5 213 247 VAC See the Caution in the front of this manual for additional information The heater indicator LED stays red but the temper ature does not increase If the display does not show cut out and shows the correct bath temperature consider the following possibilities Insufficient heating Insufficient heating may be caused by the heater power setting being too low especially at higher operating temperatures Switching to the higher heater power switch setting if available may solve the problem No heating This is caused by blown heater fuses and or burned out heaters Check the heater fuses to make sure that they are still good Access the heater fuses by removing the L shaped panel covering the display electronics If they are blown and continue to blow when replaced the heaters may be shorted If you suspect that the heaters are shorted or burned out contact a Fluke Calibra tion Authorized Service Center for assistance Too much cooling Try reducing the cooling capacity by increasing the cooling pressure or switching off the cooling altogether 57 User s Guide
64. r 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 with the exception of the BAUD rate setting xs E RS 232 Cable Wiring for der IBM PC and Compatibles Wiring The serial communications cable at mermini Computer DTE taches to the bath through the D 9 DB Spin B8 25 Pin connector at the back of the instru TNG s ment Figure 8 shows the pin out of aoe a XI xI this connector and suggested cable 4 NC 4 RTS iri 5 GNDe 5 CTS wiring les E 7 RTS 7 GND 8 CTS 8 Setup 9NC L 20 Before operation the serial interface of the bath must first be set up by B Instrument Computer DTE programming the BAUD rate and Connector Connector DB 9 Pin DB 9 Pin other configuration parameters 1 NC pat NC These parameters are programmed 2 RxD gm 2 RxD within the serial interface menu The fwe Z Hin serial interface parameters menu is 5 GND 5 GND 6 NC 6 NC outlined in Figure 6 7 RTS i e7 RTS 8 CTS
65. rees C or F monitor the heater output power adjust the controller propor tional band set the cutout set point and program the probe calibration parame ters operating parameters serial and IEEE 488 interface configuration and controller calibration parameters Operation is summarized in Figure 6 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 25 00 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 will alternately flash cutout i Indicates cut out condition The message will continue to flash until the temperature is reduced and the cut out 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 the cutout will reset itself as soon as the temperature is low ered below the cutout set point With manual reset mode the cutout must be re set 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 then the display wil
66. 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 Installation 5 1 5 2 5 3 Installation 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 The 7009 Bath e Access Hole Cover e Controller Probe e User s Guide e Drain Elbow e Report of Test If you are missing any item please contact a Fluke Calibration Authorized Ser vice Center see Section 1 3 Bath Environment The 7009 Bath is a precision instrument which should be located in an appro priate 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 use of a fume hood is recommended Bath Preparation and Filling The 7009 bath is designed for use with standard resistors therefore the soft cutout of the instrument has been set at the factory to 50 C to protect standard resistors placed in the bath In order to use the bath for other calibration pur poses the user should insure that the soft cutout is adjusted appropriately for the application The 7009 Bath is not provided with a fluid Various fluids
67. s careful unpacking and placement of the bath filling the bath with fluid installing the probe and connecting power Consult Chapter 4 for detailed instructions for proper installation 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 Power Plug the bath power cord into a mains outlet of the proper voltage frequency and current capability See Section 3 1 Specifications for power details 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 begin to heat or cool to reach the previously programmed temperature setpoint 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 button or display reading are to the right of each button or display value To view or set
68. sure ments transmitted from the serial interface If the sample rate is set to 5 for in stance then the bath will transmit the current measurement over the serial interface approximately every five seconds The automatic sampling is disabled with a sample period of 0 The sample period is indicated by SAMPLE Serial sample period parameter cl Press SET to choose to set the sample period The current sample period value will be displayed 39 User s Guide 40 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 60 New sample period A PO O ROTO 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 will be immediately echoed or transmitted back to the de vice of origin With half duplex the commands will be executed but not echoed The duplex mode parameter is indicated by A pl 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 OO TOO O Controller Operation 9 13 9 13 1 9 14 IEEE 488 Parameters Menu Baths may optionally be
69. tained at a fairly constant temperature The temperature stability of the bath depends on the width of the proportional band See Figure 7 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 conditions change Of these the most significant factors affecting the op Controller Operation MARN a Proportional Band too Narrow Proportional Band too Wide Optimum Proportional Band Lo AA AA AAA A aa Figure 7 Bath temperature fluctuation at various proportional band settings timum proportional band width are heater power setting and fluid viscosity The proportional band should be wider when the higher power setting is used so that the change in output power
70. ters menu is indicated by CAL Calibration parameters menu O HEEETEEEERHE Press SET five times to enter the menu 41 User s Guide 42 9 14 1 9 14 2 9 15 CTO Parameter CTO sets the calibration of the over temperature cutout This is not adjustable by software but is adjusted with an internal potentiometer For the 7009 bath this parameter should read between 110 and 130 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 damage or fire Command Summary A complete flowchart of controller operation is shown in Figure 6 This chart may be reproduced and used as a reference and operating guide Digital Communication Interface 10 10 1 10 1 1 10 1 2 Digital Communication Interface If supplied with the option the 7009 bath is capable of communicating with and being controlled by other equipment through the digital interface Two types of digital interface are available the RS 232 serial interface 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 powe
71. the set point temperature If for example the bath is set for a lower set point of t 220 C and the bath reaches a measured temperature of 19 7 C then the error is 0 3 C Next set the bath for the upper set point tj and after stabilizing measure the bath temperature and compute the error erry For our example we will suppose the bath was set for 80 C and the thermometer measured 80 1 C giving an error of 0 1 C Computing DO and DG Before computing the new values for D and Dg the current values must be known The values may be found by either accessing the probe calibration 51 User s Guide 52 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 DO and DG are computed by entering the old values for DO and DG the calibration temperature set points t and ty and the temperature errors errL and errH into the following equations Dr e ty Dy erry t Dj Ei icit 0 ty f D mem de tb ty t If for example DO and DG were previously set for 25 229 and erry were as given above then the new values DO and DG would be computed as 25 831 and 0028720 respectively Program the new values DO and DG into the con troller The new constants will be used the next time the bath temperature is set Check the calibration by setting the temperature to t
72. ting Problem Causes and Solutions The controller controls or attempts to control at an inaccurate temperature If the controller appears to operate normally except that the bath s temperature does not agree with the temperature measured by the user s reference ther mometer to within the specified accuracy consider the following Erroneous parameters Check that the calibration parameters are all correct according to the Report of Calibration If not reprogram the constants If the controller does not keep the correct parameters the memory backup battery may be weak causing errors in data See Low Battery in a previous solution Poor uniformity There may be an actual difference between the bath s control probe and the reference thermometer due to excess gradients in the bath Check that the bath has an adequate amount of fluid in the tank and that the stirrer is operating properly Also check that the reference thermometer and con trol probe are both fully inserted into the bath to minimize temperature gradient errors Bad control probe Check that the control probe has not been struck bent or damaged Refer to the previous solution for how to check the probe s resistance The controller shows that it is controlling at the proper temperature but the bath temperature is unstable If the bath does not achieve the expected degree of temperature stability when measured using a thermometer consider the followi
73. tions apply to the terms Warning and Caution Warning identifies conditions and actions that may pose hazards to the user Caution identifies conditions and actions that may damage the instru ment being used 1 2 1 A Warnings To avoid 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 Preparation and Filling for specific 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 Before initial use or after transport or after storage in humid or semi hu mid environments or anytime the instrument has not been energized for Before You Start more than 10 days the instrument needs to be energized for a dry out period of 2 hours before it can be assumed to meet all of the safety re quirements of the IEC 1010 1 If the product is wet or has been in a wet environment take necessary meas
74. trol Functions lll 48 10 4 1 Heater Control i asha Ey 3 Eom bo X WO a dI SECOS ROS 48 10 4 2 Cooling Control 4 d 44d a a EK EAE SX RO x 48 11 Bath Calibration 5x go daw end m RURAL Dn 51 11 1 Calibration Points e 51 11 2 Measuring the Set point Error o 51 11 3 ComputingDOandDG llle 51 11 4 Calibration Example 52 12 Maintenance scr 00 55 12 1 Draining the Bath ilg RR wee RR EG 56 13 Troubleshooting c 57 13 1 Troubleshooting sco o o RR REG 57 lii Figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Bath Assembly ecos aee a aa ES 7 Front Controller Panel s c a scort o o e Kioii 17 Sudepanelcontroals 5 2 sr a a EE ERG Ee 18 Back Panels a quus wow s vrbes Roe ee era ed Wee 20 Chart of various bath fluids and their properties 24 Flowchart showing the various menu options 30 Bath temperature fluctuation at various proportional band settings 35 Serial Communications Cable Wiring 43 Sample calibration computations cles 53 Tables Table 1 Table 2 Table 3 Table 4 Table 4 Table 5 Table 6 International Electrical Symbols sn 1 Table of various fluids and their properties 25 Proportional Band Fluid Table o 35
75. ures to remove moisture prior to apply ing power such as storage in a low humidity temperature chamber operat ing at 50 C for 4 hours or more e Overhead clearance is required Do not place the instrument under a cabi net or other structure Always leave enough clearance to allow for safe and easy insertion and removal of probes e The instrument is intended for indoor use only e The bath is a precision instrument Although it has been designed for op timum durability and trouble free operation it must be handled with care Position the bath before the tank is filled with fluid by rolling it into place DO NOT attempt to lift the bath DO NOT move a bath filled with fluid BURN HAZARD e Extremely cold temperatures may be present in this equipment Freezer burns and frostbite may result if personnel fail to observe safety precau tions e High temperatures may be present in this equipment Fires and severe burns may result if personnel fail to observe safety precautions ELECTRICAL HAZARD e These guidelines must be followed to ensure that the safety mechanisms in this instrument will operate properly This instrument must be plugged into a 230V AC electric outlet of the appropriate frequency The power cord of the instrument is equipped with a three pronged grounding plug for your protection against electrical shock hazards It must be plugged directly into a properly grounded three prong receptacle The receptacle must be instal
76. will automatically reset itself when the bath temperature falls below the reset temperature allowing the bath to heat up Controller Operation 9 9 9 10 again If the mode is set to manual then the heater will remain disabled until the user manually resets the cutout 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 SET twice to access the cutout set point Access heater power in secondary menu mbsieasussavasessassuustassceiaseues rel D ee teeter iret y CO 15t i 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 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 See Figure 6 Probe Parameters Menu The probe parameter menu is indicated by PrObE Probe
77. y 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 will let 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 chic of full power g e Access heater power in secondary menu Heater power in percent To exit out of the secondary menu press EXIT To continue on to the propor tional band setting function press SET Proportional Band In a proportional controller such as this the heater output power is proportional to the bath temperature over a limited range of temperatures around the setpoint 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 main
78. yer for importation costs of repairs replace ment parts when product purchased in one country is submitted for repair in another country Fluke s warranty obligation is limited at Fluke s option to refund of the purchase price free of charge repair or replacement of a defective product which is returned to a Fluke authorized service center within the warranty period To obtain warranty service contact your nearest Fluke authorized service center or send the product with a description of the difficulty postage and insurance prepaid FOB Destination to the nearest Fluke au thorized service center Fluke assumes no risk for damage in transit Following warranty repair the prod uct will be returned to Buyer transportation prepaid FOB Destination If Fluke determines that the failure was caused by misuse alteration accident or abnormal condition or operation or handling Fluke 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 Fluke SHALL NOT BE LIABLE FOR ANY SPECIAL INDIRECT INCIDENTAL OR CONS
79. zed Service Center for assistance Insert the probe into the 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 labelled 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 Specifica tions for power details Be sure the stirring motor power cord is plugged into the STIRRER socket at the back of the bath Bath Use 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 spe cific 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 Add

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