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Fluke Calibration Model 6102 Micro-Bath Manual PDF

1. Calibration 6102 Micro Bath User s Guide PN 3729224 January 2013 O 2013 Fluke Corporation All rights reserved Specifications are subject to change without notice All product names are trademarks of their respective companies LIMITED WARRANTY AND LIMITATION OF LIABILITY Each Fluke product is warranted to be free from defects in material and workmanship under normal use and service The warranty period is one year and begins on the date of shipment Parts product repairs and Services are warranted for 90 days This warranty extends only to the original buyer or end user customer of a Fluke authorized reseller and does not apply to fuses disposable batteries or to any product which in Fluke s opinion has been misused altered neglected contaminated or damaged by accident or abnormal conditions of operation or handling Fluke warrants that software will operate substantially in accordance with its functional specifications for 90 days and that it has been properly recorded on non defective media Fluke does not warrant that software will be error free or operate without interruption Fluke authorized resellers shall extend this warranty on new and unused products to end user customers only but have no authority to extend a greater or different warranty on behalf of Fluke Warranty support is available only if product is purchased through a Fluke authorized sales outlet or Buyer has paid the applicable international price
2. H Toggles C F gt SET EXIT Secondary Functions EXIT Y A Display Power 1 i L Set Proportional Band Cut out B Configuration Menu SET Menu Legend Press SET to step through the menu and to store the parameter value Press EXIT briefly to skip a parameter without storing the parameter value Hold EXIT to exit the menu and display the temperature EXIT EXIT Operating Parameters Adj Cut out Reset SET BAUD Rate Adjust BAUD Rate Sample Period Adj Sample Period Duplex Mode Adj Duplex Mode Linefeed Adjust Linefeed DO NOT CHANGE THESE VALUES SEE MANUAL EXIT Menu AIVANVIA SAS S3fYIVA ASSHL HONVHO LON OG 9 2 2 9 2 3 Controller Operation Temperature Set point EE 100 00 Well temperature in degrees Celsius ser Access set point memory L 2S Set point memory 1 25 C currently used d 185 iJ New set point memory 4 125 C Press SET to accept the new selection and access the set point value ser Accept selected set point memory Set point Value The set point value may be adjusted after selecting the set point memory and pressing SET Geen 4185 Set point 4 value in C If the set
3. After a brief self test the controller should begin normal operation If the unit fails to operate please check the power connection The display will begin to show the fluid temperature and the tank heater will start operating to bring the temperature of the fluid to the set point temperature Insure that the fluid is being stirred Power Plug the Micro Bath power cord into a mains outlet of the proper voltage frequency and current capability Refer to Section 3 1 Specifications for power details Turn the bath on using the rear panel POWER switch The Micro Bath will turn on and begin to heat to the previously programmed temperature set point The front panel LED display will indicate the actual bath temperature Setting the Temperature Section 9 2 explains in detail how to set the temperature set point on the calibrator using the front panel keys The procedure is summarized here 1 Press SET twice to access the set point value 2 Press UP or DOWN to change the set point value 3 Press SET to store the new set point 4 Press and hold EXIT to return to the temperature display When the set point temperature is changed the controller switches the tank heater on or off to raise or lower the temperature The displayed temperature gradually changes until it reaches the set point temperature The 6102 may require 25 minutes to reach the set point depending on the span Another 10 to 15 minutes is required t
4. Bath fluids should be selected to operate safely with adequate thermal properties to meet the application requirements Also be aware that some fluids expand and could overflow the bath if not watched Refer to Section 8 2 Bath Fluid for information specific to fluid selection and to the MSDS sheet specific to the fluid selected Generally baths are set to one temperature and used to calibrate probes only at that single temperature This means that the type of bath fluid does not have to change Additionally the bath can be left 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 injury 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 inserting it into a hot fluid Be aware that cleaning the probe can be dangerous if the probe has not cooled to room temperature Additionally high temperature fluids may ignite the
5. CEor SE Flashes CtorSt and then displays the setting 9 11 9 11 1 9 11 2 Controller Operation Serial Interface Parameters To store the new setting press SET Press EXIT to continue without storing the new value Serial Interface Parameters The serial RS 232 interface parameters menu is indicated by SEFIAL i Serial RS 232 interface parameters menu The serial interface parameters menu contains parameters which determine the operation of the serial interface These controls only apply to instruments fitted with the serial interface The parameters in the menu are baud rate sample period duplex mode and linefeed Press UP to enter the menu BAUD Rate The BAUD rate is the first parameter in the menu The BAUD rate setting determines the serial communications transmission rate The BAUD rate parameter is indicated by bRUd i Flashes bAUd and then displays the setting ege 2400 amp Current BAUD rate The BAUD rate of the serial communications may be programmed to 300 600 1200 2400 4800 or 9600 BAUD Use UP or DOWN to change the BAUD rate value 4800 b New BAUD rate 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 serial interface parameter menu The sample period is the time period in seconds between temperature measure
6. Flash Point FR Freeze Point PP Pour Point Range over which a fume hood is recommended 8 2 11 2 About the Graph The fluid graph visually illustrates some of the important qualities of the fluids shown 26 Temperature Range The temperature scale is shown in degrees Celsius The fluids general range of application is indicated by the shaded bands Qualities including pour point freeze point important viscosity points flash point boiling point and others may be shown General Operation Stirring Freezing Point The freezing point of a fluid is an obvious limitation to stirring As the freezing point is approached high viscosity may also limit performance Pour Point This represents a handling limit for the fluid Viscosity Points shown are at 50 and 10 centistokes viscosity When viscosity is greater than 50 centistokes stirring is very poor and the fluid is unsatisfactory for bath applications Optimum stirring generally occurs at 10 centistokes and below Fume Point A fume hood should be used This point is very subjective in nature and is impacted by individual tolerance to different fumes and smells how well the bath is covered the surface area of the fluid in the bath the size and ventilation of the facility where the bath is located and other conditions We assume the bath is well covered at this point This is also subject to company policy Flash Point The point at which ignition may occur The point shown
7. vi 11 3 Multiple Probe Calibration sed eene ee st aia ada a cada carcer 49 12 Calibration Procedure cerei eee eene 51 12 1 Calibration POINtS sui RS 51 12 2 Kuere eege auct fid debent ee Sl 12 21 ug TICE 52 12 2 2 Compute RO ALPIA ust dac eet oreet di tt ettet 52 12 2 3 ee H Lee Le UE 53 E A e o o lt A 55 14 Troubleshooting iii 57 14 1 Troubleshooting Problems Possible Causes and Solutions 57 142 creer qt T T TIAE 58 14 2 1 EMG EE 58 14 2 2 Low Voltage Directive Gate 58 Tables Table 1 International Electrical Symbols Table 2 ee rondan aia 9 Table 3 Table of Various Bath Fluids M ee 25 Table 4 Nominal Stirrer Motor Settings With Different Liquids 28 Table 5 Controller Communications Comrmands iei ica caia 48 vii viii Figures Figure 16102 Back Panel and POttO fi suos equi nin eb ipd edd Mie epi 17 Figure 2 6102 FOM ANG tie centres cde egener tle 18 Fide 3 Bath Lids sd Lid POETS ratones 19 le d TID ei ET 20 ele dE 20 Figure 6 Chart of Various Bath TEE 26 Figure 7 Controller Operation Flowchart spain ri 32 Fig re8 Serial Cable Wiring eegene 45 1 1 Before You Start Symbols Used 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
8. 2 Press SET then use the UP or DOWN keys until the correct numerical setting is displayed Press SET to accept the new value 3 Repeat step 2 for ALPHA and DELTA 12 2 3 Accuracy amp Repeatability Check the accuracy of the Micro Bath at various points over the calibrated range If Micro Bath does not pass specification at all set points repeat the Calibration Procedure 53 Maintenance 13 Maintenance The calibration instrument has been designed with the utmost care Ease of operation and simplicity of maintenance have been a central theme in the product development Therefore with proper care the instrument should require very little maintenance Avoid operating the instrument in an oily wet dirty or dusty environment If the outside of the instrument becomes soiled it may be wiped clean with a damp cloth and mild detergent Do not use harsh chemicals on the surface which may damage the paint It is important to keep the well of the calibrator clean and clear of any foreign matter DO NOT use chemicals to clean the well The bath should be handled with care Avoid knocking or dropping the instrument If a hazardous material is spilt on or inside the equipment the user is responsible for taking the appropriate decontamination steps as outlined by the national safety council with respect to the material If the mains supply cord becomes damaged replace it with a cord with the appropriate gauge
9. 2 on this page Controller Display The digital display is an important part of the temperature controller because it not only displays set and actual temperatures but also displays various calibrator functions settings and constants The display shows temperatures in units according to the selected scale C or F 6102 MICRO BATH 35 C to 200 C Calibration Figure 2 6102 Front Panel Controller Keypad The four button keypad allows easy setting of the set point temperature The control buttons SET DOWN UP and EXIT are used to set the calibrator temperature set point access and set other operating parameters and access and set calibration parameters Setting the control temperature is done directly in degrees of the current scale It can be set to 0 01 degrees Celsius or Fahrenheit The functions of the buttons are as follows SET Used to display the next parameter in the menu and to store parameters to the displayed value DOWN Used to decrement the displayed value of parameters UP Used to increment the displayed value EXIT Used to exit a function and to skip to the next function Any changes to the displayed value are ignored Holding the EXIT button for approximately 0 5 seconds exits back to the main display Parts and Controls Accessories 73 Accessories 73 1 Transport Pour Lid A transport pour lid Figure 3 is provided so the fluid being used does not have to be removed when transport
10. 5 External switch is open The external switch is open causing the displayed temperature to be frozen and keeping the set point from scanning Turn the switch test off by pressing the DOWN button on the front panel Controller problem The error messages signify the following problems with the controller Err 1 a RAM error Erre 2 aNVRAM error Erre 3 a Structure error Ecc 4 an ADC setup error Err 5 an ADC ready error Initialize the system by performing the Factory Reset Sequence described above The display shows Err 5 Defective control sensor The control sensor may be shorted open or otherwise damaged The display shows Err 1 Heater control error Initialize the system by performing the Factory Reset Sequence described above The stirrer is not stirring Stirrer speed needs adjusting In the Operating Parameters menu adjust the stirrer speed Str SP to O Wait for the motor to stop Adjust the stirrer speed to a setting greater than 8 but less than or equal to 25 Temperature readout is not the actual temperature of the well Instrument is unstable Possible RF energy emission With the unit stable slowly rotate the unit If no change occurs the unit may need to be calibrated If the display changes more than twice the normal display deviation another unit in the area could be emitting RF energy Move the unit to a different location and rotate the unit again If the temperature
11. 7 O 500 C Limiting Factors b boiling point e high evaporation fl flash point fr freeze point v viscosity Flash point test oc open cup cc closed cup Very low water solubility ice will form as a slush from condensation below freezing 25 6102 Micro Bath User s Guide Bath Fluid 100 C 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 0 C 100 C 200 C 300 C 400 C 500 C 600 C PP es ho cs FR Pure PN FL 12 C BP E o Hd FL 302 C 10CS FL 280 C FL 232 C FL 211 C FL 133 C m v FL 177 C D v 10 CS FL 16 C Bes ha j BP FL 60 C FR r o Q o 3 Qa Figure 6 Chart of Various Bath Fluids Shaded area represents usable range of fluid starting at 50 centistokes Lighter shading represents decreasing viscosity while vaporization and decomposition increase Black area represents liquid range with excessive viscosity Decomposition Starts SE BP Boiling Point CS Centistokes EP Evaporation Point fluid loss due to evaporation FL
12. A or 230 VAC 410 1 1 A switchable 50 60 Hz System Fuse Safety 270 W 115 V 250 V 3A F 230 V 250 V 1 6A F Overvoltage Installation Category II Pollution Degree 2 per IEC 61010 01 Environmental Conditions Although the instrument has been designed for optimum durability and trouble free operation it must be handled with care The instrument should not be operated in an excessively dusty or dirty environment Maintenance and cleaning recommendations can be found in the Maintenance Section of this manual The instrument operates safely under the following conditions e ambient temperature range 5 45 C 41 113 F e ambient relative humidity maximum 80 for temperature lt 31 C decreasing linearly to 50 at 40 C e mains voltage within 10 of nominal e vibrations in the calibration environment should be minimized e altitudes less than 2 000 meters 4 A 4 1 4 2 Quick Start Unpacking Quick Start Caution READ SECTION 6 ENTITLED BATH USE before placing the bath in service Incorrect handling can damage the bath and void the warranty Unpacking Unpack the Micro Bath carefully and inspect it for any damage that may have occurred during shipment If there is shipping damage notify the carrier immediately Verify that the following components are present e 6102 Micro Bath e Transport Pour Lid e Probe Basket e Str Bar e Power Cord e User s Guide e Report of Calibration
13. Back and Bottom Panel Refer to Figure 1 on this page Power Cord Underneath the calibrator is the removable power cord inlet that plugs into an IEC grounded socket Power Switch The power switch is located on the power entry module PEM The PEM also houses the fuses and the dual voltage selector The PEM and Heater Voltage Switch see below allow the unit to be field switchable for 115 VAC 10 or 230 VAC 10 operation DISPLAY HOLD A Power CE 115VAC 3A 230 VAC 1 6 A Y 50 60 Hz e cn 115V 3AF250V E 230V 1 6AF250V HEATER VOLTAGE SWITCH A HEATER VOLTAGE SWITCH a Back View Bottom View Figure 1 6102 Back Panel and Bottom Heater Voltage Switch To be used only when changing the input voltage See Section 8 1 for instructions on changing the input voltage Caution The input voltage and heater voltage switch settings should always be the same value Serial Port A DB 9 male connector is present for interfacing the calibrator to a computer or terminal with serial RS 232 communications 6102 Micro Bath User s Guide Front Panel 7 2 Fan The fan inside the calibrator runs continuously when the unit is being operated to provide cooling for the instrument Slots at the top and around the two corners of the calibrator are provided for airflow The area around the calibrator must be kept clear to allow adequate ventilation The airflow is directed out the back Front Panel Refer to Figure
14. Directive 89 336 EEC The Declaration of Conformity for your instrument lists the specific standards to which the unit was tested For units used in the field a slight degradation of accuracy may be noticed between 300 350 MHz with a field intensity of 10V M at the unit A piece of equipment in proximity to the unit under test must emit greater than 1000 times the permissible CE standard EN55022 at these specific frequencies to have any effect on the unit Units used in a laboratory are not affected Low Voltage Directive Safety In order to comply with the European Low Voltage Directive 73 23 EEC Hart Scientific equipment has been designed to meet the EN 61010 1 and EN 61010 2 010 standards
15. EXPRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE FLUKE SHALL NOT BE LIABLE FOR ANY SPECIAL INDIRECT INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES INCLUDING LOSS OF DATA ARISING FROM ANY CAUSE OR THEORY Since some countries or states do not allow limitation of the term of an implied warranty or exclusion or limitation of incidental or consequential damages the limitations and exclusions of this warranty may not apply to every buyer If any provision of this Warranty is held invalid or unenforceable by a court or other decision maker of competent jurisdiction such holding will not affect the validity or enforceability of any other provision Fluke Corporation Fluke Europe B V P O Box 9090 P O Box 1186 Everett WA 98206 9090 5602 BD Eindhoven U S A The Netherlands 11 99 To register your product online visit register fluke com Table of Contents 1 Before YOU Start secon re sai crest incas 1 Is a Ea ERREA REEE E ES AEEA EAA TATRANA 1 1 2 Safety INfOrmMation EE 2 e Warning Seesen e be 2 LAZ A t Acie can tide aaeee tek ate ceeatesedaadatiene toetataesari aan 4 1 3 Authorized Service Centers EE 5 2 introduction Ret 7 3 Specifications and Environmental Conditions 9 Se SS o SDN T 9 3 2 Environmental COnditionS assueta ace ist id 9 4 QUICK Sl sacan 11 WEE occ MNT TU mmm 11 LE I Uo PEE CREER 11 LC e EE 12 4 4 Setting the Tem
16. The calibrator s multiple fault protection devices insure user and instrument safety and protection The 6102 Micro Bath was designed for portability low cost and ease of operation Through proper use the instrument will continuously provide accurate calibration of temperature sensors and devices The user should be familiar with the safety guidelines and operating procedures of the calibrator as described in the instruction manual 3 3 1 3 2 Specifications and Environmental Conditions Specifications Specifications and Environmental Conditions Specifications The 6102 may not meet the specification published if a different fluid is used other than distilled water or Dow Corning 200 10 200 20 oil Do not exceed the boiling point or flash point temperatures of the fluid To ensure that the boiling and flash point temperatures are not exceeded adjust the High Limit and Cutout parameters To set these parameters refer to Section 9 Controller Operation Table 2 Specifications Range 35 to 200 C 95 to 392 F Accuracy 0 25 C Stability 0 02 C at 100 C 0 03 C at 200 C Uniformity 0 02 C Resolution 0 01 C F Operating Temperature Heating Time Cooling Time 5 to 45 C 41 to 113 F 25 C to 200 C 40 minutes 200 C to 100 C 35 minutes Well Size 1 9 dia x 5 5 deep 48 x 139 mm Size 5 5 W x 10 38 H x 8 D 14 x 26 x 20 cm Weight 10 Ib 4 5 kg with fluid Power 115 VAC 410 12 3
17. available from Hart Scientific and other sources Depending on the desired temperature range any of the following fluids as well as others may be used in the bath e Water distilled e Ethylene glycol water e Mineral oil e Silicone oil Fluids are discussed in detail in Section 8 2 Remove any access hole cover from the bath and check the tank for foreign matter dirt remnant packing material etc Thoroughly dry the inside of the well with paper towels before filling Fill the bath with clean unpolluted fluid Under filling may reduce bath performance The fluid should never exceed a height of 64 cm 25 inches below the top of the basket Carefully monitor the bath fluid level as the bath temperature rises to prevent overflow or splashing Remove excess hot fluid if necessary with caution 6102 Micro Bath User s Guide Power 5 4 Power With the bath power switch off plug the bath into an AC mains outlet of the appropriate voltage frequency and current capacity Refer to Section 3 1 Specifications for power details 14 6 1 6 2 Bath Use General Bath Use Caution Read this section before placing the bath in service The information in this section is for general information only It is not designed 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
18. characteristics Water has very low viscosity and good thermal conductivity and heat capacity which makes it among the best fluids for control stability at low temperatures Temperature stability is much poorer at higher temperatures because water condenses on the lid cools and drips into the bath Water is safe and relatively inert The electrical conductivity of water may prevent its use in some applications Water has a limited temperature range from a few degrees above 0 C to a few degrees below 100 C At higher temperatures evaporation becomes significant Water used in the bath should be distilled or softened to prevent mineral deposits Consider using an algaecide chemical in the water to prevent contamination Mineral Oil Mineral oil or paraffin oil is often used at moderate temperatures above the range of water Mineral oil is relatively inexpensive At lower temperatures mineral oil is quite viscous and control may be poor At higher temperatures vapor emission becomes significant The vapors may be dangerous and 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 overflows 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 flammable and may also cause seri
19. digital analog temperature controller The controller offers the tight control stability of an analog temperature controller as well as the flexibility and programmability of a digital controller The bath temperature is monitored with a platinum resistance sensor in the control probe The signal is electronically compared with the programmable reference signal amplified and then fed to a pulse width modulator circuit which controls the amount of power applied to the bath heater General Operation Temperature Controller The bath is operable within the temperature range given in the specifications For protection against solid state relay failure or other circuit failure a bi metallic cutout automatically turns off the heater anytime the bath temperature exceeds the maximum temperature The controller allows the operator to set the bath temperature with high resolution 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 Fahrenheit The controller is operated and programmed from the front control panel using the four key switches and digital LED display The controller is equipped with a serial RS 232 digital interface for remote operation Operation of the controller using the front control panel is discussed in Section 9 Operation using the digital interfaces is discussed in Section 10
20. e Calibration Label e RS 232 Cable e 9930 Interface it Software e Access Cover optional e Extender perf cage wrench optional Setup Place the calibrator on a flat surface with at least 6 inches of free space around the instrument Plug the power cord into a grounded mains outlet Observe that the nominal voltage corresponds to that indicated on the back of the calibrator Carefully insert the probe basket into the tank Fill the tank with the appropriate fluid The set point temperature and the number of and size of probes determine the fluid level Be sure to keep the fluid level an adequate distance below the top of the well to prevent overflowing the fluid when the probes are inserted For example placing 200 20 oil at room temperature 25 C into the bath and heating the unit to 200 C causes a 1 inch 2 54 cm expansion of the fluid inside the well Keep the fluid level at least 0 64 cm 0 25 inches below the top of the probe basket at all times With the probe probes in the tank fill the tank 3 4 full Heat to the maximum temperature of the fluid Slowly fill the well to 1 3 cm 5 inch below the top of the probe basket at the maximum temperature of the fluid 11 6102 Micro Bath User s Guide Power 12 4 3 4 4 Turn on the power to the calibrator by toggling the switch on the power entry module The fan should begin blowing air through the instrument and the controller display should illuminate after 3 seconds
21. heater power will be displayed as a percentage of full power 100 00 Well temperature ES t exa Access heater power in secondary menu SEL Flashes 18 8 P Heater power in percent To exit out of the secondary menu hold EXIT To continue on to the proportional band setting function press EXIT momentarily or SET Proportional Band In a proportional controller such as this the heater output power is proportional to the well temperature over a limited range of temperatures around the set point This range of temperature is called the proportional band At the bottom of the proportional band the heater output is 100 At the top of the proportional band the heater output is 0 Thus as the temperature rises the heater power is reduced which consequently tends to lower the temperature back down In this way the temperature is maintained at a fairly constant temperature The temperature stability of the well and response time depend on the width of the proportional band If the band is too wide the well temperature will deviate excessively from the set point due to varying external conditions This is because the power output changes very little with temperature and the controller cannot respond very well to changing conditions or noise in the system If the proportional band is too narrow the temperature may swing back and forth because the controller overreacts to temperature variations For best control stability the proportional band
22. in place and properly secured Thoroughly wipe the inside of the well dry when changing fluids as some high temperature fluids react violently to water or other liquid mediums Use of this instrument at HIGH TEMPERATURES for extended periods of time requires caution Completely unattended high temperature operation in not recommended BURN HAZARD High temperatures may be present in this equipment Fires and severe burns may result if personnel fail to observe safety precautions DO NOT mix water and oil when exceeding temperatures of 90 C 194 F ELECTRICAL HAZARD These guidelines must be followed to ensure that the safety mechanisms in this instrument will operate properly This instrument must be plugged into an AC only electric outlet as listed in Section 3 1 Specifications The power cord of the instrument is equipped with a three pronged grounding plug for your protection against electrical shock hazards It must be plugged directly into a properly grounded three prong receptacle The receptacle must be installed in accordance with local codes and ordinances DO NOT use an extension cord or adapter plug DO use a ground fault interrupt device This unit contains a liquid A ground fault device is advised in case liquid is present in the electrical system and could cause an electrical shock Always replace the power cord with an approved cord of the correct rating and type If you have questions contact an Authorized Service
23. is correct in this new area or deviates differently than the first are RF energy is present in the room If you have to perform the test in the effected area use the comparison test to eliminate any possible errors Varying line voltage or fluid is not stirring Place the unit on a clean power line If the fluid is not stirring turn the instrument off for one minute 57 6102 Micro Bath User s Guide CE Comments 58 14 2 14 2 1 14 2 2 Problem Possible Causes and Solutions AC voltage present on Use a wall plug tester to check the main power plug at the wall Use an ohmmeter to the chassis check the continuity between the ground prong on the PEM and the chassis If the resistance reading is greater than three ohms there is a problem Check the power cord for continuity on the ground prongs If the resistance is greater than one ohm replace the power cord Power Up The instrument is equipped with operator accessible fuses If a fuse blows it may be due to a power surge or failure of a component Replace the fuse once If the fuse blows a second time it is likely caused by failure of a component part If this occurs contact an Authorized Service Center Always replace the fuse with one of the same rating voltage and type Never replace the fuse with one of a higher current rating CE Comments EMC Directive Hart Scientifics equipment has been tested to meet the European Electromagnetic Compatibility Directive EMC
24. may be either the open or closed cup flash point Refer to the flash point discussion in Section 8 2 8 Boiling Point At or near the boiling point of the fluid the temperature stability is difficult to maintain Fuming or evaporation is excessive Large amounts of heater power may be required because of the heat of vaporization Decomposition The temperature may reach a point at which decomposition of the fluid begins Further increasing the temperature may accelerate decomposition to the point of danger or impracticality 8 3 Stirring Stirring of the bath fluid is very important for stable temperature control Prior to taking measurements always make sure that the bath is stirring the fluid The fluid must be mixed well for good temperature uniformity and fast controller response The stirrer is adjusted for optimum performance Table 4 on page 28 shows nominal stirrer motor settings for several fluids Note If the bath is used with the probe basket removed stir motor settings need to be changed so that a small vortex can be seen in the liquid If any water is mixed with oil when exceeeding temperatures of 90 C the bath will boil over d Warning Do not mix water and oil when exceeding temperatures of 90 C 27 6102 Micro Bath User s Guide Power 28 8 4 8 5 8 6 8 7 Table 4 Nominal Stirrer Motor Settings With Different Liquids Liquid Boiling Flash Point Stir Motor Setting Temperature Distilled Water 100 C 15 2
25. must be set for the optimum width 37 6102 Micro Bath User s Guide Cutout 38 9 8 The proportional band width is set at the factory to about 5 0 C The proportional band width may be altered by the user if he desires to optimize the control characteristics for a particular application The proportional band width is easily adjusted from the front panel The width may be set to discrete values in degrees C or F depending on the selected units The proportional band adjustment is be accessed within the secondary menu Press SET and EXIT to enter the secondary menu and show the heater power Then press SET to access the proportional band ser Ei Access heater power in secondary menu To store the new setting press SET Press EXIT to continue without storing the new value ser Accept the new proportional band setting Cutout As a protection against a hardware fault or user error the calibrator is equipped with an adjustable cutout device that shuts off power to the heater if the tank temperature exceeds a set value This protects the instrument and probes from excessive temperatures The cutout temperature is programmable by the operator from the front panel of the controller The cutout for the 6102 Bath is defaulted to 225 C If the cutout is activated because of excessive temperatures the heater shuts off and the instrument cools The tank cools until it reaches a few degrees below the cutout set poin
26. setting Scan Rate The next function in the main menu is the scan rate The scan rate can be set from to 99 9 C min The maximum scan rate however is actually limited by the natural heating or cooling rate of the instrument This is often less than 100 C min especially when cooling The scan rate function appears in the main menu after the scan control function The scan rate units are in degrees C per minute Sr 10 0 i Scan rate in C min Press SET to accept the new scan rate and continue ser Accept scan rate 9 4 9 4 1 9 4 2 Controller Operation Temperature Display Hold Temperature Display Hold The 6102 has a display hold function which allows action of an external switch to freeze the displayed temperature and stop the set point from scanning This is useful for testing thermal switches and cutouts This section explains the functions available for operating the temperature hold feature An example follows showing how to set up and use the hold feature to test a switch Hold Temperature Display The hold feature is enabled by simply pressing the UP button when the temperature is displayed The hold temperature display shows the hold temperature on the right and the switch status on the left For the status c means the switch is closed and o means the switch is open The status flashes when the switch is in its active position opposite the normal position The hold temperature shows what the
27. temperature of the well was when the switch changed from its normal position to its active position While the switch is in the normal position the hold temperature will follow the well temperature If the Scan Control is OFF and the Hold Temperature Display is being used the temperature at which the switch is activated does not affect the set point temperature However if the Scan Control is ONT and the Hold Temperature Display is being used the temperature at which the switch is activated is stored as the new set point temperature Operation of the hold temperature display is outlined below 358 7 Well temperature display fu Access hold display c 144 8 i Switch status and hold temperature To return to the normal well temperature display press DOWN Mode Setting The Hold Function is always in the automatic mode In this mode the normal position is set to whatever the switch position is when the set point is changed For example if the switch is currently open when the set point is changed the closed position then becomes the new active position The normal position will be set automatically under any of the following conditions 1 a new set point number is selected 2 the set point value is changed 3 a new set point is set through the communications channels 35 6102 Micro Bath User s Guide Secondary Menu 36 9 4 3 9 4 4 9 5 Switch Wiring The thermal switch or cutout is wired to the calibr
28. the tank Ensure that the tank extender does not leak where the tank extender and the tank meet Do not use the extender without the perf cage placed over the extender Do not leave the 6102 unattended while operating Cool the bath to ambient and remove all fluid from the bath before removing the extender 8 1 8 2 8 2 1 General Operation Switching to 230V Operation General Operation Switching to 230V Operation The 6102 is switchable from 115 VAC to 230 VAC 50 60 Hz Swithcing the voltage can change the calibration so the unit should be calibrated after changing the input voltage To change from 115 VAC to 230 VAC 1 Unplug the unit 2 Lay the unit down on its side 3 With a small straight slot screwdriver remove the fuse holder located on the bottom of the bath Replace the two fuses 3 amp 250 V with 1 6 amp 250 V fuses 4 Replace the fuse holder with the 230V in the display window 5 Using the same straight slot screwdriver move the heater switch to display 230V See the back panel and bottom drawing in Figure 1 on page 17 Caution The input voltage and heater voltage switch settings must both read 230V when complete Otherwise the unit will either not heat or only heat at a fraction of its capacity If not done properly the unit could become damaged and void the calibration and warranty Use 3 amp fuses for 115 V and 1 6 amp for 230 V only Do not plug the unit into 230 V if the heater switc
29. 25 C 0 48 25 C 0 00025 25 C 0 0007 50 C 5 25 C No 7 5011 5 125 C 0 84 75 C 0 53 75 C 0 81 125 C 0 57 125 C Silicone Oil 40 C v 130 C fl cc 133 C 5 25 C 0 92 25 C 04 0 00028 25 C 0 00105 1000 25 C Type 200 05 10 150 C 5010 Silicone Oil 30 C v 209 C fl cc 211 C 10 O 25 C 0 934 25 C 0 430 40 C 0 00032 25 C 0 00108 1000 25 C Type 200 10 3 135 C 0 45 100 C 50 150 C 5012 0 482 200 C Silicone Oil 10 C v 230 C fl cc 232 C 20 25 C 0 949 O 25 C 0 3700 40 C 0 00034 25 C 0 00107 1000 25 C Type 200 20 0 393 100 C 50 150 C 5013 0 420 200 C Silicone Oil 30 C v 278 C fl cc 280 C 50 25 C 0 90 25 C 04 0 00037 25 C 0 00104 1000 25 C Type 200 50 50 150 C 5014 Silicone Oil 70 C v 230 C fl cc 232 C 50 70 C 107 25 C 0 358 40 C 0 00035 25 C 0 00075 100 25 C Type 550 300 C fl oc 10 104 C 0 386 100 C 1 150 C 5016 0 433 200 C Silicone Oil 80 C v 300 C fl oc 302 C 50 80 C 111 25 C 0 363 40 C 0 00035 O 25 C 0 00077 100 25 C Type 710 7 204 C 0 454 100 C 1 150 C 5017 0 505 200 C Silicone Oil 66 C v 313 C fl oc 315 C 50 66 C 0 96 25 C 0 34 100 C 0 0003 0 00095 100 25 C Type 210 H 14 204 C 1 150 C Heat Transfer 180 C fr 550 C NONE 340 150 C 2 0 150 C 0 33 0 0014 0 00041 1 7 O cm Salt 5001 6 5 300 C 19 300 C 2 4 500 C 1
30. 5 C to 80 C Ethylene Glycol 77 F to 176 F 200 10 Oil 165 C 25 80 C to 140 C 176 F to 284 F 200 20 Oil 133 C 20 130 C to 200 C 266 F to 392 F Power Power to the bath is provided by an AC mains supply and passes through a filter to prevent switching spikes from being transmitted to other equipment Refer to Section 3 1 Specifications for power details 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 temperature 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 number 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 is precisely controlled by the temperature controller 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 Fluid Drain The fluid may be drained from the 6102 by tightly screwing the transport pour lid onto the top of the bath and pouring the liquid into an appropriate container Temperature Controller The bath temperature is controlled by Hart Scientific s unique hybrid
31. AN Regional Office Service Center 60 Alexandra Terrace 03 16 The Comtech Lobby D 118502 SINGAPORE Phone 65 6799 5588 Telefax 65 6799 5589 E mail anthony ng 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 Hart Scientific 6102 Micro Bath may be used as a portable instrument or bench top temperature calibrator for calibrating thermocouple and RTD temperature probes The 6102 is small enough to use in the field and accurate enough to use in the lab Calibrations may be done over a range of 35 C to 200 C 95 F to 392 F The resolution of the 6102 temperature display is 0 01 degrees The Micro Bath calibrator features e Convenient handle e RS 232 interface e Switchable AC Input 115 VAC or 230 VAC Built in programmable features include e Temperature scan rate control e Temperature switch hold e Eight Set point memory e Adjustable readout in C or F The temperature is accurately controlled by Hart s digital controller The controller uses a precision platinum RTD as a sensor and controls the well temperature with a solid state relay triac driven heater The LED front panel continuously shows the current well temperature The temperature may be easily set with the control buttons to any desired temperature within the specified range
32. Center see Section 1 3 High voltage is used in the operation of this equipment Severe injury or death may result if personnel fail to observe the safety precautions Before working inside the equipment turn off the power and disconnect the power cord DO NOT connect this unit to a non grounded non polarized outlet Always replace the fuse with one of the same rating voltage and type 6102 Micro Bath User s Guide Safety Information 1 2 2 BATH FLUIDS Fluids used in this unit 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 unit is equipped with a soft cutout user settable firmware and a hard cutout Check the flash point boiling point or other fluid characteristic applicable to the circumstances of the unit operation Ensure that the soft cutout is adjusted to the fluid characteristics of the application DO NOT exceed the boiling or flash temperatures of the fluid being used Cautions DO NOT overfill the bath Overflowing liquid may damage the electrical system Be sure to allow for thermal expansion of the fluid as the bath temperature increases See Section 5 3 Bath Preparation and Filling for specific instructions Read Section 6 Bath Use before placing the unit into service DO NOT change the values of the bath calibration constants from the factory set values Th
33. Description ING AC Alternating Current INV AC DC Battery CE ce DC Double Insulated Electric Shock Fuse PE Ground Hot Surface Burn Hazard Read the User s Guide Important Information Off OPPOGIPa Canadian Standards Association o T c o 6102 Micro Bath User s Guide Safety Information 1 2 1 2 1 Symbol Description C TICK Australian EMC mark z The European Waste Electrical and Electronic Equipment WEEE Directive 2002 96 EC mark OVERVOLTAGE Installation CATEGORY II Pollution Degree 2 per IEC 1010 1 refers to CATI 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 Safety Information Use this instrument only as specified in this manual Otherwise the protection provided by the instrument may be impaired The following definitions apply to the terms Warning and Caution e Warning identifies conditions and actions that may pose hazards to the user e Caution identifies conditions and actions that may damage the instrument being used 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 unit may cause u
34. Fluke reserves the right to invoice Buyer for importation costs of repair replacement parts when product purchased in one country is submitted for repair in another country Fluke s warranty obligation is limited at Fluke s option to refund of the purchase price free of charge repair or replacement of a defective product which is returned to a Fluke authorized service center within the warranty period To obtain warranty service contact your nearest Fluke authorized service center to obtain return authorization information then send the product to that service center with a description of the difficulty postage and insurance prepaid FOB Destination Fluke assumes no risk for damage in transit Following warranty repair the product will be returned to Buyer transportation prepaid FOB Destination If Fluke determines that failure was caused by neglect misuse contamination alteration accident or abnormal condition of operation or handling including overvoltage failures caused by use outside the product s specified rating or normal wear and tear of mechanical components Fluke will provide an estimate of repair costs and obtain authorization before commencing the work Following repair the product will be returned to the Buyer transportation prepaid and the Buyer will be billed for the repair and return transportation charges FOB Shipping Point THIS WARRANTY IS BUYER S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES
35. Micro Bath controller has access to a number of the bath calibration constants namely RO ALPHA DELTA CO CG and rCAL These values are set at the factory and must not be altered The correct values are important to the accuracy and proper and safe operation of the bath Access to these parameters is available to the user only so that in the event that the controller memory fails the user may restore these values to the factory settings The user should have a list of these constants and their settings with manual Caution DO NOT change the values of the bath calibration constants from the factory set values The correct setting of these parameters is important to the safety and proper operation of the bath The calibration parameters menu is indicated by CRL Calibration parameters menu Press SET five times to enter the menu The calibration parameters RO ALPHA DELTA CO CG and rCAL characterize the resistance temperature relationship of the platinum control sensor These parameters may be adjusted by an experienced user to improve the accuracy of the calibrator RO This probe parameter refers to the resistance of the control probe at 0 C The value of this parameter is set at the factory for best instrument accuracy ALPHA This probe parameter refers to the average sensitivity of the probe between 0 and 100 C The value of this parameter is set at the factory for best instrument accuracy DELTA This probe paramete
36. Parameters The operating parameters menu is indicated by PRr Operating parameters menu The operating parameters menu contains the Stir Speed High Limit and Cutout Reset Mode parameters Stir Speed The Stir Speed parameter adjusts stirrer motor speed The factory default is 15 be SEr SP Flashes Str Sp and then displays the setting i Current Stir Speed setting To change the stir speed press UP or DOWN 39 6102 Micro Bath User s Guide Operating Parameters 9 10 2 9 10 3 40 16 i New Stir Speed setting Press SET to accept the new Stir Speed The stir motor speed needs to be varied for best stability Table 4 on page 28 shows nominal settings for several fluids High Limit The High Limit Parameter adjusts the upper set point temperature The factory default and maximum temperature are set to 200 C For safety a user can adjust the High Limit down so the maximum temperature set point is restricted HL High Limit parameter H 90 New HL setting To store the new setting press SET Press EXIT to continue without storing the new value Cutout Reset Mode The Cutout Reset Mode determines whether the cutout resets automatically when the tank temperature drops to a safe value or must be manually reset by the operator CEorSE Cutout Reset Mode parameter Press SET to enable adjustment of the Cutout Reset Mode parameter Normally the cutout is set for manual mode
37. When the controller is set to a new set point the bath heats or cools to the new temperature Once the new temperature is reached the bath usually takes 15 20 minutes for the temperature to settle and stabilize There may be a small overshoot or undershoot 29 9 1 9 2 9 2 1 Controller Operation Well Temperature 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 display the user may monitor the well temperature set the temperature set point in degrees C or F monitor the heater output power adjust the controller proportional band and program the calibration parameters operating parameters and serial interface configuration Operation of the functions and parameters are shown in the flowchart in Figure 7 on page 32 This chart may be copied for reference In the following discussion a button with the word SET UP DOWN or EXIT inside indicates the panel button while the dotted box indicates the display reading Explanation of the button or display reading are to the right of each button or display value Well Temperature The digital LED display on the front panel allows direct viewing of the actual well temperature This temperature value is what is normally shown on the display The units C or F of the temperature value are displayed at the right For example 2 00 000 Well temperature in degr
38. ator at the two terminals on the back of the Micro Bath labeled DISPLAY HOLD The switch wires may be connected to the terminals either way Internally the black terminal connects to ground The red terminal connects to 5V through a 100 kQ resistor The calibrator measures the voltage at the red terminal and interprets 5V as open and OV as closed Switch Test Example This section describes a possible application for the temperature hold feature and how the instrument is set up and operated Suppose you have a thermal switch which is supposed to open at about 75 C and close at about 50 C and you want to test the switch to see how accurate and repeatable it is You can use the temperature hold feature and the scan function to test the switch Measurements can be made by observing the display or preferably by collecting data using a computer connected to the RS 232 port To set up the test do the following steps Connect the switch wires to the terminals on the back of the Micro Bath and place the switch in the well 2 Enable set point scanning by setting the scan to ON in the primary menu see Section 9 3 1 3 Set the scan rate to a low value say 1 0 C min see Section 9 3 2 If the scan rate is too high you may lose accuracy because of transient temperature gradients If the scan rate 1s too low the duration of the test may be longer than is necessary You may need to experiment to find the best scan rate 4 Setthe
39. cation Interface Interface Commands Interface Commands The various commands for accessing the calibrator functions via the digital interfaces are listed in this section see Table 5 These commands are used with the RS 232 serial interface The commands are terminated with a carriage return character The interface makes no distinction between upper and lower case letters hence either may be used Commands may be abbreviated to the minimum number of letters which determines a unique command A command may be used to either set a parameter or display a parameter depending on whether or not a value is sent with the command following a character For example s lt CR gt will return the current set point and s 150 0 lt CR gt will set the set point to 150 0 degrees In the following list of commands characters or data within brackets and J are optional for the command A slash 7 denotes alternate characters or data Numeric data denoted by n may be entered in decimal or exponential notation Characters are shown in lower case although upper case may be used Spaces may be added within command strings and will simply be ignored Backspace BS ASCII 8 may be used to erase the previous character A terminating CR is implied with all commands 47 6102 Micro Bath User s Guide Interface Commands Table 5 Controller Communications Commands Command Description Display Temperature Command Fo
40. e correct setting of these parameters is important to the safety and proper operation of the unit 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 parameters 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 instruments that can be easily damaged Always handle these devices with care Do not allow them to be dropped struck stressed or overheated Operate the instrument in room temperatures as listed in Section 3 2 Environmental Conditions Allow sufficient air circulation by leaving at least 6 inches of space be tween the instrument and nearby objects Overhead clearance needs to allow for safe and easy insertion and removal of probes for calibration Use only clean fluid with the instrument The Micro Bath is a precision instrument Although it has been designed for optimum durability and trouble free operation it must be handled with care Always carry the unit in an upright position to prevent the liquid from spilling out The convenient fold up handle allows one hand carrying The instrument should not be operated in excessively wet oily dusty or dirty environments It is important to keep the well of the in
41. e 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 parameter enables On or disables OFF transmission of a linefeed character 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 controller will immediately begin transmitting temperature readings at the programmed rate The serial communications uses 8 data bits one stop bit and no parity The set point and other commands may be sent via the serial interface to set the temperature set point and view or program the various parameters The interface commands are discussed in Section 10 2 All commands are ASCII character strings terminated with a carriage return character CR ASCH 13 10 2 Digital Communi
42. ed mode Iffeed onv of f ON or OFF Set serial linefeed mode to on Iffeed on lI on Set serial linefeed mode to off Ifeed of f lf of Calibration Menu Read RO calibration parameter r 0 r r0 999 999 r0 100 578 Set RO calibration parameter to n r 0 n r 100 324 90 to 110 Read ALPHA calibration al pha al al 9 9999999 al 0 0038573 parameter Set ALPHA calibration parameter al pha n al 0 0038433 002 to 005 ton Read DELTA calibration de Ita de de 9 99999 de 1 507 parameter Set DELTA calibration parameter de lta n de 1 3742 0 3 0 Read CO calibration parameter c 0 c c0 99 9999 c0 0 297 Set CO calibration parameter c 0 n c 5 113 Read CG calibration parameter cg cg cg 99 999 cg 0 555 Set CG calibration parameter cg n cg 4 115 Functions not on menu Read firmware version number ver sion ver ver 9999 9 99 ver 6102 2 00 Read structure of all commands h elp h list of commands Read all operating parameters all all list of parameters Legend Note 48 Optional Command data Returns either information n Numeric data supplied by user 9 Numeric data returned to user x Character data returned to user When DUPLEX is set to FULL and a command is sent to READ the command is returned followed by a carriage return and linefeed Then the value is returned as indicated in the RETURNED column 11 11 1 11 2 11 3 Test Probe Calibration Calibrating a Single Probe Test Probe Calibration Note T
43. ees Celsius The temperature display function may be accessed from any other function by pressing the EXIT button Temperature Set point The temperature set point can be set to any value within the range and resolution as given in the specifications Be careful not to exceed the safe upper temperature limit of any device inserted into the well Setting the temperature involves selecting the set point memory and adjusting the set point value Programmable Set points The controller stores 8 set point temperatures in memory The set points can be quickly recalled to conveniently set the calibrator to a previously programmed temperature set point To set the temperature one must first select the set point memory This function is accessed from the temperature display function by pressing SET The number of the set point memory currently being used is shown at the left on the display followed by the current set point value 31 6102 Micro Bath User s Guide Temperature Set point Figure 7 Controller Operation Flowchart 32 Display Temperature Y SET Y UP Select Setpoint Y Adjust Setpoint v Units C F v Scan On Off Y Scan Rate Switch Hold Display Mode p SET DOWN A SET UP DOWN Toggles Display of Rs EXIT
44. first program set point to a value above the expected upper switch temperature say 90 C 5 Set the second program set point to a value below the expected lower switch temperature say 40 C in the program menu 6 Collect data on a computer connected to the RS 232 port Refer to Section 9 11 Serial Interface Parameters for instructions on configuring the RS 232 communications interface Secondary Menu Functions which are used less often are accessed within the secondary menu The secondary menu is accessed by pressing SET and EXIT simultaneously and then releasing The first function in the secondary menu is the heater power display See Figure 7 on page 32 9 6 9 7 Controller Operation Heater Power Heater Power The temperature controller controls the temperature of the well by pulsing the heater on and off The total power being applied to the heater is determined by the duty cycle or the ratio of heater on time to the pulse cycle time By knowing the amount of heating the user can tell if the calibrator is heating up to the set point cooling down or controlling at a constant temperature Monitoring the percent heater power will let the user know how stable the well temperature is With good control stability the percent heating power should not fluctuate more than 5 within one minute The heater power display is accessed in the secondary menu Press SET and EXIT simultaneously and release The
45. fluid used must be considered since the increase 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 Many fluids including oils have significant thermal expansion Electrical Resistivity Electrical resistivity describes how well the fluid insulates against the flow of electric current In some applications such as measuring the resistance of bare temperature sensors it may be important that little or no electrical leakage occur through the fluid In such conditions choose a fluid with very high resistivity 8 2 7 8 2 8 8 2 9 8 2 10 General Operation Bath Fluid Fluid Lifetime Many fluids degrade over time because of evaporation water absorption gelling or chemical breakdown Often the degradation becomes significant near the upper temperature limit of the fluid substantially reducing the fluid s lifetime Safety When choosing a fluid always consider the safety issues associated Obviously where there are conditions of extreme hot or cold there can be danger to people and equipment Fluids may also be hazardous for other reasons Some fluids may be considered toxic Contact with eyes skin or inhalation of vapors may cause injury A proper fume hood must be used if hazardous or bothersome vapors are produced Warning Fluids at high temperatures may pose danger from BURNS FIRE and TOXIC FUMES U
46. h and fuse holder read 115 V This will cause the fuses to blow and may damage the instrument Bath Fluid Many fluids work with the 6102 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 electrical resistivity fluid lifetime safety and cost Caution DO NOT exceed the boiling or flash point of the fluid Temperature Range One of the most important characteristics to consider is the temperature range of the fluid Few fluids work well throughout the complete temperature range of the bath The temperature at which the bath is operated must always be within the safe and useful temperature range of the fluid The lower temperature range of the fluid is determined by the freeze point of the fluid or the temperature at which the viscosity becomes too great The upper temperature is usually limited by vaporization flammability or chemical breakdown of the fluid Vaporization of the fluid at higher temperatures may affect temperature stability because of cool condensed fluid dripping into the bath from the lid 21 6102 Micro Bath User s Guide Bath Fluid 22 8 2 2 8 2 3 8 2 4 8 2 5 8 2 6 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 viscosity fluid mixing
47. hat was shipped with the instrument Reprogram the parameters into the instrument see Section 9 12 Calibration Parameters Allow the instrument to stabilize and verify the accuracy of the temperature reading Controller locked up The controller may have locked up due to a power surge or other aberration Initialize the system by performing the Factory Reset Sequence Factory Reset Sequence Hold the SET and EXIT buttons down at the same time while powering up the instrument The instrument displays shows n t the model number and the firmware version Each of the controller parameters and calibration constants must be reprogrammed The values can be found on the Report of Calibration that was shipped with the instrument Power switch may be set incorrectly Make sure the 115 230 VAC switch and the PEM and heater switch are set to the correct type of input voltage Check that the fuse is not blown If the fuse is blown the display should be out The instrument heats or cools too quickly or too slowly Incorrect scan and scan rate settings The scan and scan rate settings may be set to unwanted values Check the Scan and Scan Rate settings The scan may be off if the unit seems to be responding too quickly The scan may be on with the Scan Rate set low if unit seems to be responding too slowly An o is displayed at the left of the display The display shows any error of the following Eer Ll Erre Err 3 Err Yor Err
48. hing the set temperature Inserting a cold probe into a well requires another period of stabilizing depending on the magnitude of the disturbance and the required accuracy For example inserting a 25 inch diameter room temperature probe at 200 C takes 5 minutes to be within 0 1 C of its settled point and takes 10 minutes to achieve maximum stability Speeding up the calibration process can be accomplished by knowing how soon to make the measurement Typical measurements should be made at the desired temperatures with the desired test probes to establish these times Multiple Probe Calibration When calibrating multiple probes place the probes equally spaced around the inside edge of the probe basket 49 12 12 1 12 2 Calibration Procedure Calibration Points Calibration Procedure Note This procedure is to be considered a general guideline Each laboratory should write their own procedure based on their equipment and their quality program Each procedure should be accompanied by an uncertainty analysis also based on the laboratory s equipment and environment Sometimes the user may want to calibrate the bath to improve the temperature set point accuracy Calibration is done by adjusting the controller probe calibration constants RO ALPHA and DELTA so that the temperature of the bath as measured with a standard thermometer agrees more closely with the set point The thermometer used must be able to measure the well tempera
49. his procedure is to be considered a general guideline Each laboratory should write their own procedure based on their equipment and their quality program Each procedure should be accompanied by an uncertainty analysis also based on the laboratory s equipment and environment For optimum accuracy and stability allow the calibrator to warm up for 25 minutes after power up and then allow adequate stabilization time after reaching the set point temperature After completing operation of the calibrator allow the well to cool by setting the temperature to 25 C for one half hour before switching the power off Calibrating a Single Probe Insert the probe to be calibrated into the well of the bath Best results are obtained with the probe inserted to the full depth of the well Once the probe is inserted into the well allow adequate stabilization time to allow the test probe temperature to settle as described above Once the probe has settled to the temperature of the well it may be compared to the calibrator display temperature The display temperature should be stable to within 0 1 C degree for best results Caution Never introduce any foreign material into the well Stabilization and Accuracy The stabilization time of the Micro Bath depends on the conditions and temperatures involved Typically the test well will be stable to 0 1 C within 10 minutes of reaching the set point temperature Ultimate stability will be achieved 30 minutes after reac
50. ing The lid doubles as a pour spout Pour Spout Pour Spout Cover Aluminum Transport Pour Lid Access Cover optional Transport Plug Guide Ring Figure 3 Bath Lids and Lid Parts 73 2 Access Cover Optional An aluminum access cover Figure 3 may be purchased for optimum stability Holes should be drilled in the access cover to allow insertion of the probes into the tank The holes must be within the guide ring for the probes to fit into the probe basket 73 3 Probe Basket A probe basket Figure 4 is provided as a guide for the probes and to prevent bumping of the stir bar 6102 Micro Bath User s Guide Accessories 20 7 3 4 7 3 5 Figure 4 Probe Basket Stir Bar The stir bar Figure 5 sits in the bottom of the well for mixing the fluid providing better accuracy uniformity and stability L Figure 5 Stir Bar Tank Extender Optional An optional tank extender is available for increasing the depth of the tank The stability and the uniformity of the bath may change when using the extender The extender screws onto the tank and is equipped with an O ring Thread the extender down using the wrench until the O ring makes a good seal Some fluids may expand up to 6 35 cm 2 5 inches Therefore when using the tank extender keep in mind how much the fluid will expand Do not overfill
51. ions may change and sources sometimes offer differing information Hart Scientific cannot be liable for any personal injury or damage to equipment product or facilities resulting from the use of these fluids The user of the bath is responsible for collecting correct information exercising proper judgment and insuring safe operation Operating near the limits of certain properties such as the flash point or viscosity can compromise safety or performance Your company s safety policies regarding flash points toxicity and such issues must be considered You are responsible for reading the MSDS material safety data sheets and acting accordingly Table 3 Table of Various Bath Fluids Fluid Lower Upper Specific Thermal Thermal Hart Temperature Temperature Flash Viscosity Specific Heat Conductivity Expansion Resistivity Part No Limit Limit Point centistokes Gravity cal g C cal s cm C cm cm C 10 O cm Halocarbon 100 C v 70 C e NONE 5 7 50 C 1710 4C 0 2 0 0004 0 0011 0 8 0 8 40 C 5019 0 5 70 C Methanol 96 C fr 10 C fl cc 12 C 1 3 35 C 0 8109 O C 0 6 0 0005 20 C 0 0014 O 25 C 0 66 0 C 0 792 O 20 C 0 45 20 C Water 0 C fr 95 C b NONE 1 25 C 1 00 1 00 0 0014 0 0002 25 C 0 4 75 C Ethylene 30 C fr 90 C b NONE 7 0 C 1 05 0 8 0 C 0 001 Glycol 50 2 50 C 5020 0 7 100 C Mineral Oil 10 C v 166 C fl 168 C 15 75 C 0 87
52. 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 ten centistokes Twenty 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 Oil viscosity may vary greatly with temperature When using fluids with higher viscosities the controller proportional band may need to be increased to compensate for the reduced response time Otherwise the temperature may begin to oscillate Specific Heat Specific heat is the measure of the heat storage ability of the fluid Specific heat to a small degree affects the control stability It also affects the heating and cooling rates Generally a lower specific heat means quicker heating and cooling The proportional band may require some adjustment depending on the specific heat of the fluid Thermal Conductivity Thermal conductivity measures how easily heat flows through the fluid Thermal conductivity of the fluid affects the control stability temperature uniformity 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 temperature Thermal expansion of the
53. m 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 designed reflective metal apparatus When calibrating over a wide temperature range better results can generally be achieved by starting at the highest temperature and progressing down to the lowest temperature Probes can be held in place in the bath by using probe clamps or drilling holes in the access cover Other fixtures to hold the probes can be designed The object 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 temperature 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 Back and Bottom Panel 7 Parts and Controls 7 1 The user should become familiar with the bath and its parts
54. mable Set points uere tt beendet rra 31 922 Setpoint Valg e ed 33 9 2 3 Temperature Scale El E 33 93 TOUR TE mr 34 e Bl E RE RE RET E 34 E EE 34 9 4 Temperature Display Hold see n 35 9 4 1 Hold Temperature Display ssm ee 35 94 2 MOTE Uo A TP 35 Accu eiu lee EE 36 344 OW TeSt EXSIMDIB sti deeg 36 95 Secondary ME aia 36 9 6 Ee 37 9 Propor onal BAN E of 98 e re EE 38 989 ConbrollerContiguE Sli EE 39 9 10 Operating Parameters NETT TOTO 39 A eo o 39 9 10 2 EE 40 9 103 Cutout Reset DO E 40 9 11 Serial Interface Parameters sssssssssss eene 41 9 E CHE RE RET U 41 9 11 2 Sample Period i eee eee a est pat reda 41 9 11 3 Duplex ee EE 42 9 11 4 Linefeed cece 42 9 12 Calor tien Pais EE 43 TZN RO NET EET 43 9 12 2 ALPHA RRREEEEEEEEEEEEEEEEEEEEMMEEMMMMMMMMM 43 E Os DELA EE 43 9 12 40 are actetuer uec c UL ee 44 912S H UU T 44 10 Digital Communication Interface 45 10 1 Serial COMMUNICAtIONS carril ia 45 VOTA VIO WEE 45 102 SU AA 45 SE W RC EROR ER 46 10 1 2 2 Sample PSO EE 46 10 123 Duplex MOOG varies pL 46 10124 mete OQ ci itt eite ecce a a Du c ER i 46 TS Serial OperatOM EE 46 10 Imertace EE assi 47 11 Test Probe Calibrati0N ooncccccnnncccccncnncnncencnnnoncnnnnnnnrenanannnos 49 11 1 Calibrating a Single Probe AAA 49 11 2 Stapiliz tion And JACOUES E 49
55. ments transmitted from the serial interface If the sample rate is set to 5 the instrument transmits the current measurement over the serial interface approximately every five seconds The automatic sampling is disabled with a sample period of 0 The sample period is indicated by SPEr i Flashes SPEr and then displays the setting SPs 1 i Current sample period seconds 41 6102 Micro Bath User s Guide Serial Interface Parameters 9 11 3 9 11 4 42 Adjust the value with UP or DOWN and then use SET to store the sample rate to the displayed value EXIT does not store the new value SP 60 i New sample period Duplex Mode The next parameter is the duplex mode The duplex mode may be set to full duplex or half duplex With full duplex any commands received by the calibrator via the serial interface are immediately echoed or transmitted back to the device of origin With half duplex the commands are executed but not echoed The duplex mode parameter is indicated by Linefeed The final parameter in the serial interface menu is the linefeed mode This parameter enables on or disables off transmission of a linefeed character LF ASCII 10 after transmission of any carriage return The linefeed parameter is indicated by LF Flashes LF and then displays the setting 9 12 9 12 1 9 12 2 9 12 3 Controller Operation Calibration Parameters Calibration Parameters The operator of the
56. menu is indicated with 5E c IAL Finally press SET to enter the serial parameter menu In the serial 45 6102 Micro Bath User s Guide Serial Communications 46 10 1 2 1 10 1 2 2 10 1 2 3 10 1 2 4 10 1 3 interface parameters menu are the BAUD rate the sample rate the duplex mode and the linefeed parameter Baud Rate The baud rate is the first parameter in the menu The display will prompt with the baud rate parameter by showing b RU gd Press SET to choose to set the baud rate The current baud rate value will then be displayed The baud rate of the 6102 serial communications may be programmed to 300 600 1200 2400 4800 or 9600 baud The baud rate is pre programmed to 2400 baud Use UP or DOWN to change the baud rate value Press SET to set the baud rate to the new value or EXIT to abort the operation and skip to the next parameter in the menu Sample Period The sample period is the next parameter in the menu and prompted with SPEr The sample period is the time period in seconds between temperature measurements transmitted from the serial interface If the sample rate is set to 5 the instrument transmits the current measurement over the serial interface approximately every five seconds The automatic sampling is disabled with a sample period of 0 Press SET to choose to set the sample period Adjust the period with UP or DOWN and then use SET to set th
57. nknown hazards to the user 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 DO NOT install access cover without holes onto a bath that is energized Dangerous pressures may result from fluids vaporizing 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 humid environments or anytime the instrument has not been energized for more than 10 days the instrument needs to be energized for a dry out period of 2 hours before it can be assumed to meet all of the safety requirements of the IEC 61010 1 If the product is wet or has been in a wet environment take necessary measures to remove moisture prior to applying power such as storage in a low humidity temperature chamber operating at 50 C for 4 hours or more Before You Start Safety Information Overhead clearance is required Do not place the instrument under a cabinet or other structure Always leave enough clearance to allow for safe and easy insertion and removal of probes The instrument is intended for indoor use only DO NOT use the unit in environments other than those listed in the user s guide DO NOT carry the unit without the transport lid
58. o stabilize within 0 03 C of the set point Ultimate stability may take 20 to 30 minutes more of stabilization time 5 1 5 2 5 3 Installation Bath Environment Installation Caution READ SECTION 6 ENTITLED BATH USE before placing the bath in service Incorrect handling can damage the bath and void the warranty Bath Environment The 6102 Micro Bath is a precision instrument which should be located in an appropriate environment The location should be free of drafts extreme temperatures and temperature changes dirt etc The surface where the bath is placed must be level Because the bath is designed for operation at high temperatures keep all flammable and meltable materials away from the bath Although the bath is well insulated top surfaces do become hot Beware of the danger of accidental fluid spills The bath should be placed on a heat proof surface such as concrete with plenty of clear space around the bath If the bath is operated at high temperatures a fume hood should be used to re move any vapors given off by hot bath fluid Dry out Period Before initial use after transport and any time the instrument has not been energized for more than 10 days the bath will need to be energized for a dry out period of 1 2 hours before it can be assumed to meet all of the safety requirements of the IEC 61010 1 Bath Preparation and Filling The 6102 Micro Bath is not provided with a fluid Various fluids are
59. ous injury if inhaled or ingested Silicone Oil Dow Corning 200 10 200 20 Silicone oils are available which offer a much wider operating temperature range than mineral oil Like most oils silicone oils have temperature control characteristics which are somewhat poorer than water The viscosity changes significantly with temperature and thermal expansion also occurs These oils have very high electrical resistivity Silicone oils are fairly safe and non toxic Silicone oils are fairly expensive Fluid Characteristics Charts Table 3 on page 25 and Figure 6 on page 26 have been created to provide help in selecting a heat exchange fluid media for your constant temperature bath These charts provide both a visual and numerical representation of most of the physical qualities important in making a selection The list is not all inclusive There may be other useful fluids not shown in this listing The charts include information on a variety of fluids which are often used as heat transfer fluid in baths Because of the temperature range some fluids may not be useful with your bath 8 2 11 1 General Operation Bath Fluid Limitations and Disclaimer The information given in this manual regarding fluids is intended only to be used as a general guide in choosing a fluid Though every effort has been made to provide correct information we cannot guarantee accuracy of data or assure suitability of a fluid for a particular application Specificat
60. paper towels if the probe has not been cooled Warning Some of the high temperature fluids react violently to water or other liquid mediums 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 allow sufficient time for the probes to settle and the temperature of the bath to stabilize One of the significant dividends of using a bath rather than a dry well to calibrate multiple probes is that the probes do not need to be identical in construction 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 totally eliminated Even though all baths have horizontal and vertical gradients these gradients are minimized inside the 15 6102 Micro Bath User s Guide Calibration of Multiple Probes 16 6 3 bath work area Nevertheless probes should be inserted to the same depth in the bath liquid Be sure that all probes are inserted deep enough to prevent stem effect From research at Hart 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 war
61. perature AAA 12 5 InstalldliOl E 13 5 1 Bath VID EP canaria no 18 e Kee E 13 5 Bath Prepareton dme Filing RE 13 SA EE 14 O Ball Ee 15 ECH EE EEN 15 6 2 Comparison Calibration vrai Get t ror mnt ea 15 6 3 Calibration of Multiple ee 16 7 Parts and COMMONS uec ii 17 7 1 Back and Bottom Panel EE 17 A2 e CET 18 K WEEN 19 Tol dransponjPoutr Lid estatal rettet seg de 19 8 9 RI Ec Cover EE 19 Doo occisi o m Ls 19 POM EE 20 7255 Tank Extender Optional ene 20 General Operations 21 8 1 Switching to 230V Operation EE 21 e IA O EE 21 Ac MEME 06 0013 Range PT 21 822 VISCOSITY BE 22 ie e E EE 22 8 2 4 Thermal Conductivity ssssssssss eere nnn nnne nenne 22 8 2 5 Thermal EXxparsliOrn s eessen 22 8 2 6 Electrical Hesietivifv mmm er een 22 8 2 7 Fluid Lifetime eene en en nnne nnne nnns 23 8 28 Salei deed 23 EE 23 9 10 Commonly Us d DICIS E 23 8 2 10 41 Water DISUll amp gd ia oa 24 62109 Mineral Ollauri onze met oo EEEE pev tu did 24 8 2 10 3 Silicone Oil Dow Corning 200 10 200 20 24 8 2 1T Flia Characteristics Cial MT 24 8 2 11 Limitations and Disclaimer enseri s see cra sien de a ee 25 82112 Abo bthe GIADA s se ee eener iso rid ket ed d Daten n RE UR hind 26 ME E E E EET 2f EMILIO c v 28 ROME c MUN o mST 28 8 6 IE SEE p serra ad 28 B Temperature Controller EE 28 Controller Operation 31 SENE Well Tee dE A EN 9 2 Temperat re e EE 31 923 Program
62. ple the set point resistance by holding down the SET key and pressing the DOWN key Write these values down as T and R respectively 3 Repeat step 2 for the other two set points recording them as T R T and R respectively 4 Using the recorded data calculate new values for RO ALPHA and DELTA parameters using the equations given below 51 6102 Micro Bath User s Guide Calibration Procedure 52 12 2 1 12 2 2 Compute DELTA A T T B T T cL Th E LER a 100 100 100 100 plaea ERR 100 100 100 100 E R T F R T AF BE DE CF T Measured temperature using thermometer R Value of R from display of 6102 Press SET and DOWN at the same time delta where T and R are the measured temperature and resistance at 50 0 C T and R are the measured temperature and resistance at 90 0 C T and R are the measured temperature and resistance at 150 0 C Compute RO amp ALPHA T T a T delta 1 100 100 SIE X a T delta 100 I 300 Ra Ra rzero dd R E R alpha _ _ R a Ria Where delta is the new value of DELTA computed above Program the new values for DELTA delta RO rzero and ALPHA alpha into the Micro Bath with the following steps 1 Press SET and EXIT keys at the same time and then press SET until Calibration Procedure Calibration Procedure RO is displayed
63. point value is correct hold EXIT to resume displaying the well temperature Press UP or DOWN to adjust the set point value 25 00 New set point value When the desired set point value is reached press SET to accept the new value and access the temperature scale units selection If EXIT is pressed instead of SET any changes made to the set point are ignored ser Accept new set point value Temperature Scale Units The temperature scale units of the controller can be set by the user to degrees Celsius C or Fahrenheit F The selected units are used in displaying the well temperature set point and proportional band Press SET after adjusting the set point value to change display units Un C i Scale units currently selected Press UP or DOWN to change the units 33 6102 Micro Bath User s Guide Scan 34 9 3 9 3 1 9 3 2 Une F New units selected Scan The scan rate can be set and enabled so that when the set point is changed the bath heats or cools at a specified rate degrees per minute until it reaches the new set point With the scan disabled the bath heats or cools at the maximum possible rate Scan Control The scan is controlled with the scan on off function that appears in the main menu after the set point function Sc FF Scan function off Gee a Scan function on Press SET to accept the present setting and continue ser Accept scan
64. r characterizes the curvature of the resistance temperature relationship of the sensor The value of this parameter is set at the factory for best instrument accuracy 43 6102 Micro Bath User s Guide Calibration Parameters 44 9 12 4 9 12 5 CO and CG These parameters calibrate the accuracy of the bath set point These are programmed at the factory when the bath is calibrated DO NOT alter the value of these parameters If the user desires to calibrate the bath for improved accuracy then calibrate RO ALPHA and DELTA according to the procedure in Section 12 rCAL DO NOT adjust this parameter It is for factory use only 10 10 1 10 1 1 10 1 2 Digital Communication Interface Serial Communications Digital Communication Interface The Micro Bath calibrator is capable of communicating with and being controlled by other equipment through the digital serial interface With a digital interface the instrument may be connected to a computer or other equipment This allows the user to set the set point temperature monitor the temperature and access any of the other controller functions all using remote communications equipment Communications commands are summarized in Table 5 on page 48 Serial Communications RS 232 Cable Wiring for The calibrator is installed with an IBM PC and Compatibles RS 232 serial interface that allows serial digital communications over fairly long distances With the serial In
65. rmat Command Example Returned Returned Example Acceptable Values Read current set point s etpoint S set 999 99 C or F set 150 00 C Set current set point to n s etpoint n s 200 00 Instrument Range Read temperature Temperature t t 999 99 C or F t 55 6 C Read temperature units u nits u Ux 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 Read scan mode sc an SC scan ON or OFF scan ON Set scan mode sc an 0n off sc on ON or OFF Read scan rate sr ate sr srat 99 9 C or F min srat 12 4C min Set scan rate sr ate n sr 1 1 1 to 99 9 Read hold ho ld ho hold open closed hold open 30 5 C 99 9 C or F Secondary Menu Read proportional band setting pr opband pr pb 999 9 pb 15 9 Set proportional band to n pr opband n pr 8 83 Depends on Configuration Read heater power po wer po po 999 9 po 1 0 duty cycle Configuration Menu Operating Parameters Menu Read stirrer motor speed moftor mo mo 99 mo 15 Set stirrer motor speed to n mo tor n mo 16 0 to 40 Serial Interface Menu Read serial sample setting sa mple sa sa 9 sa 1 Set serial sampling setting ton sa mple n sa 0 0 to 999 seconds Set serial duplex mode du plex f ull h alf FULL or HALF Set serial duplex mode to full du plex f ull du f Set serial duplex mode to half du plex h alf du h Set serial linefe
66. se appropriate caution and safety equipment Fluids may be flammable and require special fire safety equipment and procedures An important characteristic of the fluid to consider is the flash point The flash point is the temperature at which there is sufficient vapor given off so that when there is sufficient oxygen present and a ignition source is applied the vapor will ignite This does not necessarily mean that fire will be sustained at the flash point The flash point may be either of the open cup or closed cup type Either condition may occur in a bath situation The closed cup temperature is always the lower of the two The closed cup represents the contained vapors inside the tank and the open cup represents the vapors escaping the tank Oxygen and an ignition source will be less available inside the tank Environmentally hazardous fluids require special disposal according to applicable federal or local laws after use Cost Cost of bath fluids may vary greatly from cents per gallon for water to hundreds of dollars per gallon for synthetic oils Cost may be an important consideration when choosing a fluid Commonly Used Fluids Below is a description of some of the more commonly used fluids and their characteristics 23 6102 Micro Bath User s Guide Bath Fluid 24 8 2 10 1 8 2 10 2 8 2 10 3 8 2 11 Water Distilled Water is often used because of its very low cost availability and excellent temperature control
67. strument Computer DTE interface the user may access any of Connector Connector the functions parameters and settings B Pin sc discussed in Section 9 with the Mid i E ie x e exception of the BAUD rate setting 3TxD OA ee 3TxD 4NC 2 4 DTR 5 GND Z 5GND Wiring 6NC 6 DSR l 7RTS 7RTS The serial communications cable 8CTS AR 8CTS attaches to the calibrator through the 9NC 9NC DB 9 connector at the back of the instrument Figure 8 shows the pin out of this connector and suggested instet Computer DTE cable wiring To eliminate noise the Connector Connector serial cable should be shielded with DB 9 Pin DB 25 Pin low resistance between the connector 1NC DB 9 and the shield If the unit is SC See used in a heavy industrial setting the 4NC 4RTS serial cable must be limited to ONE zap 5CTS METER in length d O DK eE SE 7 RTS 7 GND 8CTS re 8DCD 9NC e e 20DTR Setup Before operation the serial interface Figure 8 Serial Cable Wiring must first be set up by programming the BAUD rate and other configuration parameters These parameters are programmed within the serial interface menu The serial interface parameters menu is outlined in Figure 7 on page 32 To enter the serial parameter programming mode first press EXIT while pressing SET and release to enter the secondary menu Press SET repeatedly until the display reads P A r Press UP until the serial interface
68. strument clean and clear of any foreign matter Do not operate near flammable materials 1 3 Before You Start Authorized Service Centers If a mains supply power fluctuation occurs immediately turn off the instrument Power bumps from brown outs and black outs could damage the instrument Wait until the power has stabilized before re energizing the instrument Components and heater lifetime can be shortened by continuous high temperature operation DO NOT operate the instrument without fluid The input voltage and heater voltage switch settings must always be set to the same value Authorized Service Centers Please contact one of the following authorized Service Centers to coordinate service on your Hart product Fluke Corporation Hart Scientific Division 799 E Utah Valley Drive American Fork UT 84003 9775 USA Phone 1 801 763 1600 Telefax 1 801 763 1010 E mail support hartscientific com Fluke Nederland B V Customer Support Services Science Park Eindhoven 5108 5692 EC Son NETHERLANDS Phone 31 402 675300 Telefax 31 402 675321 E mail ServiceDesk fluke nl 6102 Micro Bath User s Guide Authorized Service Centers Fluke Int 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 Ofluke com cn Fluke South East Asia Pte Ltd Fluke ASE
69. t temperature At this point the action of the cutout is determined by the setting of the cutout mode parameter The cutout has two modes automatic reset or manual reset If the mode is set to automatic the cutout automatically resets itself when the temperature falls below the reset temperature allowing the tank to heat up 9 9 9 10 9 10 1 Controller Operation Controller Configuration again If the mode is set to manual the heater remains disabled until the user manually resets the cutout The cutout set point may be accessed within the secondary menu Press SET and EXIT simultaneously to enter the secondary menu The heater power is displayed Press SET twice to access the cutout set points cubout i Flashes cutout and then the setting 100 i New cutout setting To store the new setting press SET Press EXIT to continue without storing the new value Controller Configuration The controller has a number of configuration and operating options and calibration parameters which are programmable via the front panel These are accessed from the secondary menu after the proportional band function by pressing SET Pressing SET again enters the first of three sets of configuration parameters operating parameters serial interface parameters and calibration parameters The menus are selected using the UP and DOWN keys and then pressing SET See Figure 7 on page 32 Operating
70. ture with higher accuracy than the desired accuracy of the bath By using a good thermometer and following this procedure the bath can be calibrated to an accuracy of better than 0 5 C up to 200 C Calibration Points In calibrating the bath RO ALPHA and DELTA are adjusted to minimize the set point error at each of three different bath temperatures Any three reasonably separated temperatures may be used for the calibration Improved results can be obtained for shorter ranges when using temperatures that are just within the most useful operating range of the Micro 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 50 C to 150 C is chosen as the calibration range then the calibrator may achieve an accuracy of say 0 3 C over the range 50 to 150 C Choosing a range of 50 C to 90 C may allow the calibrator to have a better accuracy of maybe 0 2 C over that range but outside that range the accuracy may be only xl 5C Calibration Procedure 1 Choose three set points to use in the calibration of the RO ALPHA and DELTA parameters These set points are generally 40 C 95 C and 195 C but other set points may be used if desired or necessary 2 Set the bath to the low set point When the bath reaches the set point and the display is stable wait 15 minutes or so and then take a reading from the ther mometer Sam
71. wire for the current of the instrument If there are any questions call an Authorized Service Center for more information Before using any cleaning or decontamination method except those recommended by Hart users should check with an Authorized 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 equipment design the operation of the Micro Bath may be impaired or safety hazards may arise 55 14 14 1 Troubleshooting Troubleshooting Problems Possible Causes and Solutions Troubleshooting This section contains information on troubleshooting and CE Comments Troubleshooting Problems Possible Causes and Solutions In the event that the instrument appears to function abnormally this section may help to find and solve the problem Several possible problem conditions are described along with likely causes and solutions If a problem arises please read this section carefully and attempt to understand and solve the problem If the problem cannot otherwise be solved contact an Authorized Service Center see Section 1 3 Be sure to have the model number and serial number of your instrument available Problem Incorrect temperature reading Instrument does not heat or heats at half rate Possible Causes and Solutions Incorrect RO ALPHA and DELTA parameters Find the value for RO ALPHA and DELTA on the Report of Calibration t

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