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7011 Users Guide 682201.vp

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1. Computing DO and DG Before computing the new values for DO and DG the current values must be known The values may be found by either accessing the probe calibration menu from the controller panel or by inquiring through the digital interface 47 7O11 Calibration Bath User s Guide The user should keep a record of these values in case they may need to be re stored in the future The new values DO and DG are computed by entering the old values for DO and DG the calibration temperature set points t and ty and the temperature errors errL and errH into the following equations _ erty t DO err t DO LD DO O ly err ett DG DG ly DO 25 229 DG 186 974 t 25 00 C measured t 24 869 C ty 75 00 C measured t 74 901 C Compute errors err 24 869 25 00 C 0 131 C erry 74 901 75 00 C 0 099 C Compute D 00 2209 01 D 75 0 25 229 75 0 250 DO 25 229 25 066 Compute Ds 0 131 0 099 75 0 25 0 bo 186 974 186 854 Figure 9 Sample calibration computations 48 10 4 10 Bath Calibration Calibration Example If for example DO and DG were previously set for 25 229 and 186 9740 re spectively and the data for t ty err and erry were as given above then the new values DO and DG would be computed as 24 627 and 185 728 respec tively Program the new values DO and DG into the controll
2. 7O11 Calibration Bath User s Guide 28 8 1 10 5 8 1 11 8 1 11 1 8 1 11 2 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 1t over flows when heated The viscosity and thermal characteristics of mineral oil 1s 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 1s flam mable and may also cause serious injury if inhaled or ingested Silicone oil Silicone oils are available which offer a much wider operating temperature range than mineral oil These oils are more expensive as well For information on silicone oils contact Hart Scientific Fluid Characteristics Charts Table 2 and Figure 6 on pages 29 and 30 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 1s 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 Limitations and Disclaimer The information given in this manual regarding fluids is intended only to be use
3. Fluid Table Proportional Fluid Temperature Heater Setting Band Stability Water 30 0 C Low 0 04 C 0 0004 C Water 60 0 C Low 0 04 C 0 001 C Eth Gly 50 35 0 C Low 0 05 C 0 0005 C Eth Gly 50 60 0 C Low 0 05 C 0 001 C Eth Gly 50 100 0 C High 0 4 C 0 007 C Oil 35 0 C Low 0 1 C 0 003 C Oil 60 0 C Low 0 2 C 0 002 C Oil 100 C Low 0 2 C 0 003 C To accept the new setting and access the cutout set point press SET Pressing EXIT will exit the secondary menu ignoring any changes just made to the proportional band value SET Accept the new proportional band setting Cutout As a protection against software or hardware fault shorted heater triac or user error the bath 19 equipped with an adjustable heater cutout device that will shut off power to the heater if the bath temperature exceeds a set value This protects the heater and bath materials from excessive temperatures and most impor tantly protects the bath fluids from being heated beyond the safe operating temperature preventing hazardous vaporization breakdown or ignition of the liquid The cutout temperature is programmable by the operator from the front 9 Controller Operation Cutout panel of the controller It must always be set below the upper temperature limit of the fluid and no more than 10 degrees above the upper temperature limit of the bath If the cutout 1s activated because of excessive bath temperature t
4. and current capability See Section 3 1 Specifications for power details Set the HEATER switch on the front panel to position LOW and turn the bath on using the front panel POWER switch The bath will turn on and begin to heat or cool to reach the previously programmed temperature setpoint The front panel LED display will indicate the actual bath temperature The factory set set point 1s 25 C Setting the Temperature In the following discussion a solid box around the word SET UP EXIT or DOWN indicates the panel button while the dotted box indicates the display reading Explanation of the button or display reading are to the right of each button or display value To view or set the bath temperature set point proceed as follows The front panel LED display normally shows the actual bath temperature 24 68 E Bath temperature display When SET 1s pressed the display shows the set point memory that is cur rently being used and its value Eight set point memories are available SET Access set point selection l 25 0 3 Set point 1 25 0 C currently used Press SET to accept the new value and display the vernier value The bath be gins heating or cooling to the new set point 4 Quick Start Setting the Temperature SET Store new set point access vernier 0 00000 i Current vernier value exi Return to the temperature display PU 13 C Bath temperature display The bath will heat or cool until it reaches the n
5. The drain 1s located on the back of the bath See Figure 4 on page 22 Make sure the drain elbow is secured into the valve before attempting to drain the bath The following information is helpful when draining the bath Always use a container capable of holding the entire load of fluid Using an adequate size about 8 gallons or cubic foot heat proof fluid container 1s extremely impor tant Use safety equipment as appropriate 11 Maintenance Draining the Bath 1 Water and low viscosity fluids Drain at room temperature Normal care must be taken for fluids that may have corrosive or damaging effects on the surrounding facility or equipment 2 High viscosity oils The fluid should be sufficiently low in viscosity to drain efficiently Some oils such as 710 silicone oil may need to be heated to 80 C to be fluid enough to drain well The viscosity affects how rapidly it drains as well as how well it flows off of the walls Heat proof containers and appropriate safety equipment such as face shields gloves and body covering are recommended A WARNING Extreme danger of BURNS and FIRE Use safety equipment use proper equipment and have fire safety equipment standing by 53 12 Troubleshooting Troubleshooting 12 12 1 Troubleshooting This section contains information on troubleshooting and CE Comments This information pertains to a number of bath models and certain specifics may not pertain to your model Troubleshoo
6. 15 C below the flash point of the bath fluid See Section 8 1 Heat Transfer Fluid for specific information on bath fluids and Section 9 8 Cutout 1 2 2 AX CAUTIONS To avoid possible damage to the instrument follow these guidelines Always operate the instrument in room temperatures listed in Section 3 2 Environmental Conditions Allow sufficient air circulation by leaving at least 15 cm 6 inches of clearance around the instrument 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 fac tory set values The correct setting of these parameters 19 important to the safety and proper operation of the unit The refrigeration may be damaged or the lifetime shortened if the set point temperature 1s set above 60 C for more than one hour with the refrigeration manually on Ensure that the refrigeration is off when the unit is used above 60 C The Factory Reset Sequence should be performed only by authorized personnel if no other action is successful in correcting a malfunction You must have a copy of the most recent Report of Test to restore the test pa rameters DO NOT operate this instrument in an excessively wet o
7. 232 C 50 70 C 1 07 25 C 0 358 40 C 0 00035 O 25 C 0 00075 100 25 C 5016 300 C fl oc 10 104 C 0 386 100 C 1 150 C 0 433 200 C Dow Corning 710 80 C v 302 C fl oc 302 C 50 80 C 1 11 25 C 0 363 40 C 0 00035 O 25 C 0 00077 100 25 C 5017 7 204 C 0 454 100 C 1 150 C 0 505 200 C Dow Corning 66 C v 315 C fl oc 315 C 50 66 C 0 96 25 C 0 34 O 100 C 0 0003 0 00095 100 25 C 210 H 14 204 C 1 150 C Silicone Oil Heat Transfer Salt 145 C fr 530 C NONE 34 150 C 2 0 150 C 0 33 0 0014 0 00041 1 7 Q em 6 5 300 C 1 9 300 C 5001 2 4 500 C 1 7 500 C Limiting Factors b boiling point e high evaporation fl flash point fr freeze point v viscosity Flash point test Very low water solubility ice will form as a slush from condensation below freezing oc open cup cc closed cup Freezing Point The freezing point of a fluid is an obvious limitation to stir ring As the freezing point 1s 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 na ture and is im
8. Mineral oil e Silicone oil Fluids are discussed 1n detail 1n Section 8 1 Remove any access hole cover from the bath and check the tank for foreign matter dirt remnant packing material etc Use clean unpolluted fluid Care fully fill the bath through the large square access hole to a level that will allow for stirring and thermal expansion The fluid should never exceed a height of 3 4 below the top of the tank Refer to the fill level indicator label on the right rear side of the bath Carefully monitor the bath fluid level as the bath tempera ture rises to prevent overflow or splashing Remove excess fluid if necessary and with caution if the fluid 1s hot Some fluids especially oils will expand at higher temperatures USE CAUTION Be careful to prevent bath fluid from spilling on the stirring motor while filling Note that underfilling may reduce bath performance and may possibly damage the bath heater Probe Inspect the bath controller probe It should not be bent or damaged in any way Reasonable caution should be used in handling this probe as it contains a preci sion platinum sensor and is mechanically shock sensitive Dropping striking or other physical shock may cause a shift in resistance in the probe resulting in diminished bath accuracy If damaged the probe can be replaced Contact an Authorized Service Center for assistance Insert the probe into the 1 4 inch probe hole at the top left side of the bath lid The t
9. The point shown may be either the open or closed cup flash point Refer to the flash point discussion in Section 8 1 7 30 8 General Operation Stirring 8 2 8 3 8 4 Boiling Point At or near the boiling point of the fluid the temperature stabil ity 1s 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 decomposi tion to the point of danger or impracticality Stirring Stirring of the bath fluid is very important for stable temperature control The fluid must be mixed well for good temperature uniformity and fast controller response The stirrer is precisely adjusted for optimum performance Power Power to the bath is provided by an AC mains supply See Section 3 1 Specifi cations for power details Power to the bath passes through a filter to prevent switching spikes from being transmitted to other equipment To turn on the bath switch the control panel power switch to the ON position The stir motor will turn on the LED display will begin to show the bath tem perature and the heater will turn on or off until the bath temperature reaches the programmed set point When powered on the control panel display will briefly show a four digit num ber This number indicates the number of time
10. be sure that the temperature limits of the bath fluid are not exceeded Exceeding the tem perature limits of the bath fluid could cause harm to the operator lab and instrument e The over temperature cutout should be checked every 6 months to see that it is working properly In order to check the user selected cutout follow the controller directions Section 9 8 for setting the cutout Both the man ual and the auto reset option of the cutout should be checked Set the bath temperature higher than the cutout Check to see if the display flashes cut out and the temperature is decreasing e The constant temperature bath depends upon the certain qualities of the fluid medium in order to maintain a uniform and stable temperature envi ronment Some oils change their characteristics or become dirty after a period of use Always remove any foreign materials from the bath e Silicone oils as well as others may evaporate off their lighter components over a period of time leaving the very viscous components remaining In addition some decomposition occurs which may impair the temperature stability of the bath When this happens the fluid is generally very dark to black and viscous Vegetable oils polymerize turn plastic like after they have been used for a time at high temperatures making them very difficult to remove When the oil has become unusable it should be changed The instructions for removing the oil is as follows Draining the Bath
11. conductivity thermal expansion electrical conductivity fluid lifetime safety and cost Temperature Range One of the most important characteristics to consider 1s 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 tempera ture range of the fluid is determined by the freeze point of the fluid or the tem perature at which the viscosity becomes too great The upper temperature is usually limited by vaporization flammability or chemical breakdown of the fluid Evaporization of the fluid at higher temperatures may affect temperature stability because of cool condensed fluid dripping into the bath from the lid The bath temperature should be limited by setting the safety cut out so that the bath temperature cannot exceed the safe operating temperature limit of the fluid Viscosity Viscosity 1s a measure of the thickness of a fluid how easily it can be poured and mixed Viscosity affects the temperature stability of the bath With low vis cosity fluid mixing is better which creates a more uniform temperature throughout the bath This improves the bath response time which allows it to maintain a more constant temperature For good control the viscosity should be less than 10 centistokes 50 centistokes is about the upper limit of allowable viscosity Vi
12. contains the cutout reset mode setting 9 11 1 9 12 9 12 1 A 9 Controller Operation Calibration Parameters Cutout Reset Mode The cutout reset mode determines whether the cutout resets automatically when the bath temperature drops to a safe value or must be manually reset by the operator The parameter is indicated by LE ar St i Cutout reset mode parameter Press SET to access the parameter setting Normally the cutout is set for manual mode Calibration Parameters The operator of the bath controller has access to a number of the bath calibra tion constants namely CTO H and L These values are set at the factory and must not be altered The correct values are important to the proper and safe op eration of the bath Access to these parameters 1s available to the user only so that in the event that the controller s memory fails the user may restore these values to the factory settings The user should have a list of these constants and their settings with the manual CAUTION DO NOT change the values of the bath calibration constants from the factory set values The correct setting of these parameters is im portant to the safety and proper operation of the bath The calibration parameters menu is indicated by CAL Calibration parameters menu Press SET five times to enter the menu CTO Parameter CTO sets the calibration of the over temperature cutout This is not adjustable by software but 1s adjusted
13. cycle count shows a low num ber such as 0002 the battery is spent and should be replaced Con tact an Authorized Service Center for assistance 5 After replacing the battery you must reprogram the calibration and user adjustable parameters into the controller Hart Scientifics equipment has been tested to meet the European Electromag netic Compatibility Directive EMC Directive 89 336 EEC The Declaration of Conformity for your instrument lists the specific standards to which the unit was tested Low Voltage Directive Safety In order to comply with the European Low Voltage Directive 73 23 EEC Hart Scientific equipment has been designed to meet the IEC 1010 1 EN 61010 1 and the IEC 1010 2 010 EN 61010 2 010 standards
14. ee GEES 23 Table of various fluids and their properties 20 Chart of various bath fluids and their properties 30 Controller Flowchart llle 36 Bath temperature fluctuation at various proportional band settings 41 Proportional Band Fluid Table 42 Sample calibration computations 004 48 1 Before You Start Symbols Used 1 1 Before You Start Symbols Used Table 1 lists the International Electrical Symbols Some or all of these symbols may be used on the instrument or in this manual Table 1 International Electrical Symbols Symbol Description NA AC Alternating Current INS AC DC Battery CE Complies with European Union Directives CN AN DC Double Insulated Electric Shock Fuse PE Ground Hot Surface Burn Hazard Read the User s Manual Important Information Off On O gt el BI 7011 Calibration Bath User s Guide Symbol Description GR Canadian Standards Association C US CAT II OVERVOLTAGE Installation CATEGORY II Pollution Degree 2 per IEC1010 1 re fers to the level of Impulse Withstand Voltage protection provided Equipment of OVERVOLTAGE CATEGORY Il is energy consuming equipment to be supplied from the fixed installation Examples include household office and laboratory appliances The European Waste Electrical and Electronic Equipment WEEE Directive 2002 96 EC mark C TIC Australian EMC Mark
15. full CCW for temperature slewing and op eration If during operation the front panel meter indicates excessive cooling this valve is closed partially turn CW until the percentage of heating to cool ing 19 brought into line It is necessary to wait a few minutes after each adjust ment until the system settles Set the COOLING TEMPERATURE valve to the nominal pressure indicated by the chart see table in Section 7 2 Interpolate values for temperatures be tween those shown Above 38 C set the pressure to 90 PSIG Refrigeration may not be required above 40 C Actual pressures may be varied from chart values in order to optimize performance however the pressure should not ex ceed 3 PSIG above chart values Wait a few minutes after each adjustment until the system establishes itself Readjust if required after settling for a while The BACK PRESSURE valve should normally be open fully CCW The valve may be partially closed to reduce cooling capacity The optimum controller output power is from 10 to 30 percent as monitored on the controller duty cycle display see Section 9 6 For maximum cooling for slewing to lower temperatures the BACK PRES SURE valve should be fully open and the COOLING TEMPERATURE set to 0 C Readjust higher or lower as required after set temperature is reached Temperature Controller The bath temperature 1s controlled by Hart Scientific s unique hybrid digi tal analog temperature controller The contro
16. other operating parameters and access and set bath calibration parameters A brief description of the functions of the buttons follows SET Used to display the next parameter in a menu and to set parameters to the displayed value DOWN Used to decrement the displayed value of settable parameters UP Used to increment the displayed value EXIT Used to exit from a menu When EXIT is pressed any changes made to the displayed value will be ignored 3 The on off switch controls power to the entire bath assembly It powers the stirring motor and the bath controller heater circuit 4 The control indicator 1s a two color light emitting diode This indicator lets the user visually see the ratio of heating to cooling When the indicator is red the heater 1s on and when it is green the heater is off and the bath is cooling 7011 HIGH PRECISION BATH 10 C to 110 C HEATER e o ns HEATING COOLING Figure 2 Front Panel 19 7O11 Calibration Bath User s Guide 20 7 2 When the indicator toggles red green it has reached the set point and is at tempting to control at that temperature 5 The heater power switch is used to select the appropriate heater power lev els for heating and controlling the bath at various temperatures 6 The cooling power switch controls power to the cooling compressor and cooling fan Side Panel The side panel has three features see Figure 3 1 the BACK PRESSURE valv
17. to maintain the mem ory data may become scrambled causing problems A nearby large static discharge may also affect data in memory Verify that the parameters on the Report of Test are accurate Cycle the power off disconnect the bath from AC and then restart the bath e The controller may need to be reset Perform the follow ing Factory Reset Sequence Factory Reset Sequence Hold the SET and EXIT but tons down at the same time while powering up the instrument The instrument display 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 Test that was shipped with the instrument e If initializing the memory does not remedy the problem there may be a failed electronic component Contact an Authorized Service Center see Section 1 3 on page 5 for assistance Possible causes may be either a faulty control probe or erroneous data in memory e The probe may be disconnected burned out or shorted e Check that the probe is connected properly The probe may be checked with an ohmmeter to see if it is open or shorted The probe is a thermistor The resistance should read approximately 3 kohms between pins 3 and 4 12 kohms between pins 1 and 4 and 9 11 kohms be tween pins 1 and 3 at room temperature 25 C If the probe appears to be defective contact an Authorized Service Center see Section 1 3 on page
18. with an internal potentiometer For the 7011 bath this parameter should read between 110 and 130 45 7O11 Calibration Bath User s Guide 9 12 2 H and L These parameters set the upper and lower set point limits of the bath DO NOT change the values of these parameters from the factory set values To do so may present danger of the bath exceeding its temperature range causing damage or fire 46 10 10 1 10 2 10 3 10 Bath Calibration Calibration Points Bath Calibration In some instances the user may want to calibrate the bath to improve the tem perature set point accuracy Calibration 1s done by adjusting the controller probe calibration constants DO and DG so that the temperature of the bath as measured with a standard thermometer agrees more closely with the bath set point The thermometer used must be able to measure the bath fluid temper ature with higher accuracy than the desired accuracy of the bath By using a good thermometer and carefully following procedure the bath can be calibrated to an accuracy of better than 0 1 C over a range of 50 degrees Calibration Points In calibrating the bath DO and DG are adjusted to minimize the set point error at each of two different bath temperatures Any two reasonably separated bath temperatures may be used for the calibration however best results will be ob tained when using bath temperatures which are just within the most useful op erating range of the bath The f
19. 5 for assis tance e f the problem is not the probe erroneous data in mem ory may be the cause Re initialize the memory as dis cussed in the problem The display flashes cutout and an incorrect process temperature If the problem re mains the cause may be a defective electronic compo nent contact an Authorized Service Center see Section 1 3 on page 5 for assistance 12 Troubleshooting Troubleshooting Problem The controller controls or at tempts to control at an inaccurate temperature Causes and Solutions The controller operates normally except when controlling at a speci fied set point At this set point the temperature displayed does not agree with the temperature measured by the user s reference ther mometer to within the specified accuracy This problem may be caused by an actual difference in temperature between the points where the control probe and thermometer probe measure tempera ture by erroneous bath calibration parameters or by a damaged con trol probe e Check that the bath has an adequate amount of fluid in the tank and that the stirrer is operating properly e Check that the thermometer probe and control probe are both fully inserted into the bath to minimize temperature gradient errors e Check that the calibration parameters are all correct ac cording to the Report of Test If not re program the con stants The memory backup battery may be weak causing errors in data as de
20. 5 00 C i Bath temperature in degrees Celsius Press SET to accept the new selection and access the set point value 37 7O11 Calibration Bath User s Guide 38 9 3 2 9 3 3 SET Accept selected set point memory Set point Value The set point value may be adjusted after selecting the set point memory and pressing SET The set point value is displayed with the units C or F at the left e eee aa a uat If the set point value need not be changed then press EXIT to resume dis playing the bath temperature Press UP or DOWN to adjust the set point value C 42 50 New set point value When the desired set point value is reached press SET to accept the new value and access the set point vernier If EXIT is pressed instead then any changes made to the set point will be ignored SET Accept new set point value Set point Vernier The set point value can only be set with a resolution of 0 01 C The user may want to adjust the set point slightly to achieve a precise bath temperature The set point vernier allows one to adjust the temperature below or above the set point by a small amount with very high resolution Each of the 8 stored set points has an associated vernier setting The vernier is accessed from the set point by pressing SET The vernier setting 1s displayed as a 6 digit num ber with five digits after the decimal point This is a temperature offset in de grees of the selected units C o
21. E 1 2 Safety Information Use this instrument only as specified in this manual Otherwise the protection provided by the instrument may be impaired The following definitions apply to the terms Warning and Caution e WARNING identifies conditions and actions that may pose hazards to the user e CAUTION identifies conditions and actions that may damage the in strument being used 1 2 1 A WARNINGS To avoid possible electric shock or personal injury follow these guidelines GENERAL e 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 unknown hazards to the user DO NOT use the unit in environments other than those listed in the user s guide DO NOT overfill the bath Overflowing extremely cold or hot fluid may be harmful to the operator See Section 5 3 Bath Preparation and Filling for specific instructions Follow all safety guidelines listed in the user s manual Calibration Equipment should only be used by Trained Personnel If this equipment is used in a manner not specified by the manufacturer the protection provided by the equipment may be impaired Before initial use or after transport or after storage in humid or semi hu mid environments or anytime the instrument has not been energized for more than 10 days the instrument needs to be energized for a dry out 1 Before You Sta
22. PN 3720821 March 2013 Calibration Model 7011 Temperature Bath User s Guide 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 internationa
23. Precautions must be taken to prevent personal injury or damage to objects Probes may be extremely hot or cold when removed from the bath Cautiously handle probes to prevent personal in Jury Carefully place probes on a heat cold resistant surface or rack until they are at room temperature It is advisable to wipe the probe with a clean soft cloth or paper towel before inserting it into another bath This prevents the mixing of fluids from one bath to another If the probe has been calibrated in liquid salt carefully wash the probe in warm water and dry completely before transferring it to another fluid Always be sure that the probe is completely dry before in serting it into a hot fluid Some of the high temperature fluids react violently to water or other liquid mediums Be aware that cleaning the probe can be danger ous if the probe has not cooled to room temperature Additionally high temper ature fluids may ignite the paper towels if the probe has not been cooled For optimum accuracy and stability allow the bath adequate stabilization time after reaching the set point temperature Comparison Calibration Comparison calibration involves testing a probe unit under test UUT against a reference probe After inserting the probes to be calibrated into the bath al low sufficient time for the probes to settle and the temperature of the bath to stabilize One of the significant dividends of using a bath rather than a dry well to cali br
24. SET and EXIT simultaneously and then releasing The first function in the secondary menu is the heater power display Heater Power The temperature controller controls the temperature of the bath by pulsing the heater on and off The total power being applied to the heater is determined by the duty cycle or the ratio of heater on time to the pulse cycle time This value may be estimated by watching the red green control indicator light or read di rectly from the digital display By knowing the amount of heating to the bath the user can tell if the bath 19 heating up to the set point cooling down or con trolling at a constant temperature Monitoring the percent heater power will let the user know how stable the bath temperature 1s With good control stability the percent heating power should not fluctuate more than 1 within one minute The heater power display is accessed in the secondary menu Press SET and EXIT simultaneously and release The heater power will be displayed as a percentage of full power J e Access heater power in secondary menu IP Per Heater power in percent To exit out of the secondary menu press EXIT To continue on to the propor tional band setting function press SET Proportional Band In a proportional controller such as this the heater output power is proportional to the bath temperature over a limited range of temperatures around the setpoint This range of temperature 1s called the propor
25. TIES 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 Table of Contents 1 Before You Start o o oooooooo o 1 1 1 Symbols Used s s mana oh bum x setei ddad I 1 2 safety Information e 2 121 WARNINGS e conser isa oh EUR EEE 2 12 2 CAUTIONS lt o Row vou RARA E GCUROP UE 979 X o UR UR E OPUS S 4 1 3 Authorized Service Centers sra sd ono ER ERA HE HS 5 2 Introduction a 232 33 s 46066868 Fe Ge ttn See eee 7 3 Specifications and Environmental Conditions 9 3 1 Specifications uu ko Rhee eee ee eee ee we nd 9 322 Environmental Conditions lll n 10 4 Quick SPIEL ex eee ee e
26. arther apart the calibration temperatures the larger will be the calibrated temperature range but the calibration error will also be greater over the range If for instance 20 C and 80 C are chosen as the cali bration temperatures then the bath may achieve an accuracy of say 0 2 C over the range 20 to 80 C Choosing 30 C and 70 C may allow the bath to have a better accuracy of maybe 0 05 C over the range 30 to 70 C but outside that range the accuracy may be only 0 5 C Measuring the Set point Error The first step in the calibration procedure is to measure the temperature errors including sign at the two calibration temperatures First set the bath to the lower set point which we will call t Wait for the bath to reach the set point and allow 15 minutes to stabilize at that temperature Check the bath stability with the thermometer When both the bath and the thermometer have stabilized measure the bath temperature with the thermometer and compute the tempera ture error err which is the actual bath temperature minus the set point temper ature If for example the bath is set for a lower set point of t 20 C and the bath reaches a measured temperature of 19 7 C then the error 1s 0 3 C Next set the bath for the upper set point ty and after stabilizing measure the bath temperature and compute the error erry For our example we will suppose the bath was set for 80 C and the thermometer measured 80 1 C giving an error of 0 1 C
27. ate multiple probes is that the probes do not need to be identical in construc tion The fluid in the bath allows different types of probes to be calibrated at the same time However stem effect from different types of probes 19 not to tally eliminated Even though all baths have horizontal and vertical gradients 17 7011 Calibration Bath User s Guide 18 6 3 these gradients are minimized inside the bath work area Nevertheless probes should be inserted to the same depth in the bath liquid Be sure that all probes are inserted deep enough to prevent stem effect From research at Hart Scien tific we suggest a general rule of thumb for immersion depth to reduce the stem effect to a minimum 15 x the diameter of the UUT the sensor length Do not submerge the probe handles If the probe handles get too warm during calibration at high temperatures a heat shield could be used just below the probe handle This heat shield could be as simple as aluminum foil slid over the probe before inserting it in the bath or as complicated as a specially designed reflective metal apparatus When calibrating over a wide temperature range better results can generally be achieved by starting at the highest temperature and progressing down to the lowest temperature Probes can be held in place in the bath by using probe clamps or drilling holes in the access cover Other fixtures to hold the probes can be designed The ob ject 1s to keep the reference p
28. d 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 Specifications 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 judgement and insuring safe operation Operating near the limits of certain properties such as the flash point or viscos ity can compromise safety or performance Your company s safety policies re garding flash points toxicity and such issues must be considered You are responsible for reading the MSDS material safety data sheets and acting accordingly About the Graph The fluid graph visually illustrates some of the important qualities of the fluids shown Temperature Range The temperature scale is shown in degrees Celsius The fluids general range of application is indicated by the shaded bands Qualities including pour point freeze point important viscosity points flash point boil ing point and others may be shown 8 General Operation Heat Transfer Fluid Table2 Table of various fluids and their properties Fluid Lower Upper Specific Heat Thermal Thermal 4 Hart Part No Temperature Temperatur
29. do aaa ee wa ea S 42 9 9 Controller Configuration ccn 44 9 10 Probe Parameters Menu 26 va o ox moo RR RR we 44 9 10 1 DO seee no res ke we ee DATE aa 44 9 10 2 I 44 9 11 Operating Parameters o 6 wx o3 9 x ox RARA q 9 11 1 Cutout Reset Mode 45 9 12 Calibration Parameters 45 9 12 1 ClO pede eee eee eee ee ee ee ee ee ae ae 45 dup Pando uk mee 30S ee eee E RENE RE TUE P E x 46 10 Bath Calibration 47 10 1 Calibration Points a 47 10 2 Measuring the Set point Error 47 10 3 Computing DOandDG 47 10 4 Calibration Example oa aoa a 49 11 Maintenance s 9 9 ares 33 9 s S1 11 1 DrainingtheBath 52 12 Troubleshooting 55 12 1 Troubleshooting x3 xe mass bad oe ee SEER 39 12 2 Come s d x 37m ww mW S d m V ees ease dU de re sea E d 58 12 2 1 EMC DWeCUVe us uos EU Au bx X Ale 3 X ERAS SARA XX x9 58 122 2 Low Voltage Directive Safety R rir AE N 58 Vi Figures and Tables Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Table 2 Figure 6 Figure 7 Figure 8 Table 3 Figure 9 Bath Assembly 24 2 ow wed Rok 4 EE Re Eee x om we eee 7 POE Panel gt rme te wes ge whe eee eRe A 19 Refrigeration Controls Side Panel 20 Back Panel ona porase maeta eg ee SOR kee ede ee 27 LidOpuoags s s 3 3 4 3849 RSS RR eee
30. e 2 the COOLING TEMPERATURE regulating valve and 3 the COOLING TEMP gauge Cooling Back Pressure Temperature an CD Figure 3 Refrigeration Controls Side Panel 1 The BACK PRESSURE valve adjustment is used to control the amount of cooling supplied to the system This valve reduces the cooling capac ity by restricting the flow of refrigerant to the bath allowing the adjust ment of the heating to cooling percentage Under normal operation the valve should be fully open counter clockwise 2 The COOLING TEMPERATURE regulating valve is used to adjust the pressure which determines the temperauture the refrigerant evaporates Refer to the lable below the gauge for approximate psi vs bath tempera ture settings The table from the label is reproduced below 7 Parts and Controls Back Panel For this bath Set the Cooling Temp Valve to this pressure Control Nominal Cooling PSIG DO NOT set the Cooling Pressure above 90 PSIG 3 The COOLING TEMP gauge is used to indicate the temperature at which the refrigerant 1s evaporating The COOLING TEMP regulating valve is used to set and then controls this temperature Back Panel The back panel has seven main features see Figure 4 1 The probe connector 2 stirrer power outlet 3 system fuses internal 4 power cord 5 serial nota tion 6 the drain valve and 7 model and power label 1 The probe connector in the back panel is used for the tem
31. e Flash Viscosity Specific cal g C Conductivity Expansion Resistivity Limit Limit Point centistokes Gravity cal s cm C cm cm C 10 Q cm Halocarbon 0 8 90 C v 70 C e NONE 5 7 Q 50 C 1 71 40 C 0 2 0 0004 0 0011 5019 0 8 40 C 0 5 70 C Methanol 96 C fr 60 C b 54 C 1 239 35 C 0 810 0 C 0 6 0 0005 O 20 C 0 0014 25 C 0 66 0 C 0 792 20 C 0 45 20 C Water 0 C fr 95 C b NONE 1 25 C 1 00 1 00 0 0014 0 0002 25 C 0 4 O 75 C Ethylene 35 C fr 90 C b NONE 7 0 C 1 05 0 8 O 0 C 0 001 Glycol 50 2 0 50 C 5020 0 7 100 C Mineral Oil 40 C v 190 C fl 190 C 15 75 C 0 87 25 C 0 48 25 C 0 00025 O 25 C 0 0007 0 50 C 5 25 C 5 125 C 0 84 75 C 0 53 75 C 0 81 125 C 0 57 125 C Dow Corning 40 C v 133 C fl cc 133 C 5 25 C 0 92 25 C 0 4 0 00028 O 25 C 0 00105 1000 25 C 200 5 10 150 C Silicone Oil Dow Corning 35 C v 165 C fl cc 165 C 100 25 C 0 934 25 C 0 43 40 C 0 00032 O 25 C 0 00108 1000 25 C 200 10 3 135 C 0 45 100 C 50 150 C 5012 0 482 200 C Dow Corning 7 C v 230 C fl cc 230 C 20 25 C 0 949 25 C 0 370 40 C 0 00034 O 25 C 0 00107 1000 25 C 200 20 0 393 100 C 50 150 C 5013 0 420 200 C Dow Corning 25 C v 280 C fl cc 280 C 20 25 C 0 96 25 C 0 4 0 00037 O 25 C 0 00104 1000 25 C 200 50 50 150 C Silicone Oil Dow Corning 550 70 C v 232 C fl cc
32. e cutout has been triggered then the temperature display will alternately flash Cut ovukt l Indicates cutout condition The message will continue to flash until the temperature is reduced and the cutout is reset The cutout has two modes automatic reset and manual reset The mode de termines how the cutout is reset which allows the bath to heat up again When in automatic mode the cutout will reset itself as soon as the temperature is low ered below the cutout set point With manual reset mode the cutout must be re set by the operator after the temperature falls below the set point When the cutout is active and the cutout mode is set to manual reset then the display will flash ut o E until the user resets the cutout To access the re set cutout function press the SET button SET Access cutout reset function The display will indicate the reset function 35 7O11 Calibration Bath User s Guide T A Secondary Functions emperature P EXIT SET ES ee ER EXIT Display Power EXIT Reset Cutout EXIT Set Proportional Band EXIT Set Cutout Temp EXIT Adjust Vernier EXIT EXIT Set Scale C F Configuration Menu SET EXIT EXIT Calibration Menu Parameters Menu Adj Cutout Reset Mode Adjust L SET EXIT Figure 7 Controller Flowchart 36 9 3 9 3 1 9 Controller Operation Temperature Set point rESEE P i Cutout reset function Press SET once m
33. ee 9 4 3 3 E 11 4 Unpackids s 29 5093 8 x 0 m kesre SEES BORN E 1 4 2 SED s mou mus SG AEREAS ERG 11 4 3 POWS 2262 39x 958 4X 8 E MORES RIPE RS B RN KS 12 4 4 Setting the Temperature sn eoe de RE eus EUR ER Ed 12 S Installation lt lt lt unas 4 k Ed ES 15 5 1 Bath Environment ox cw RO UR sh aa seas 15 3 2 CDrysout Period a 243 4x9 9x43 59 4 53 s3 15 5 3 Bath Preparation and Filling 15 5 4 TA o e TS 16 5 5 POMCE 322999 eee E E RARA 16 O Bat R esere lt a sosa aso 17 6 1 General acaso 17 6 2 Comparison Calibration lll sn 17 6 3 Calibration of Multiple Probes 18 7 Parts and Controls cc 19 7 1 Front Control Panel 4 4 2 o9 9 2 xo o9 xx DE E I9 al Side Panel e wow som eee SA RS 20 7 3 Back Panels e 4 2 o x ee o 9 X 09 rear rior 2 7 4 Lilo sos ssa FRASES AS RSRSRS 22 lii 8 General Operation 25 8 1 Heat Transfer Fluid ss sora Fes RAR SERES RE oe 25 8 1 1 Temperature Ran e s 3 cu gore ead wead UE a BUE UE EDS a 25 8 1 2 NMISCOS N gt acces hob oe ee Sone ee eee te eae Ce ee SS 23 8 1 3 SPee 2 2 x duo o3 RR EE ERA Su NU Bee OR RUE d x 25 8 1 4 Thermal Conde scans mor REOR NOW ORE x RUE a 26 8 1 5 Thermal Expansi n s wo uoo OS Ede he or boned eee SEER ox 26 8 1 6 Electrical Resistivity iu gare gua ee R RR Pw ee CS ew He E 26 8 1 7 K ces oe we Pee RES ee e
34. ee eee ee ese eh eee ee 26 8 1 8 Fid Lifetimes chee oe ee ee eek ee e pib RETE ae eee ee 27 8 1 9 COM pe e eee wee ee ee eee eee ee eee ee ee 21 8 1 10 Commonly Used Fluids 4 aaa dm oy o 664 27 SID Wall eaten aay E siri GC dono ox ue deu ME A EAE e xS 27 SS 1102 Ethylene Glyc l ade meum bee as dd Eee Bam eon 21 SNP M Id lt 4i2 62864442 eee ee AAA a ee e 27 SO REUS cies eo He oe oe ook ee eA ee A BS SLIOS SUSO a Aa AA AE 28 8 1 11 Fluid Characteristics Charts sms press a A 28 8 1 11 1 Limitations and Disclaimers 2 64 ss eros Rm m o m Ee 28 SALE About The Graph usce aros eg eig PRES EE E RR eon 28 8 2 DUI 2 x 2 x eee eds Van 8369 X SR aan P ae 3l 8 3 POWEE Bae Gewese we 5 9 5 NOW Pe ae eee EA A 3l 8 4 CAE oros asas RE RM 31 8 5 Cooling o 1 32 8 6 Temperature Controller 22 9 Controller Operation 35 9 1 Bath Temperature xou n aoa a a 5mx ESe35532 5355 35 OD Reset ntOlE oe wx 9x0 9 50x E RE E A 35 9 3 Temperature Set point no m m 9 309 2 3 39 0 5 P ee De ee oT 9 3 Programmable Set points ux uc un box o9 hom whom 39SOX Xx xov TS 37 Jud eeu sesuais RAGE E i 38 e fis o Pee DOM VEM s e s pisada PESE E 38 9 4 Temperature Scale Units rn 39 oD Secondary Menu z wor 9 mom ox oR 3 MES ee SOR GE oS 40 9 6 Heater Power 222 53 9x29 5434341933939 40 9 7 Proportional Band 4 s aoaaa Rom RR HARK ox 40 9 8 CO a posos ce
35. er The new con stants will be used the next time the bath temperature is set Check the calibration by setting the temperature to t and ty and measuring the errors again If desired the calibration procedure may be repeated again to further 1m prove the accuracy Calibration Example The bath is to be used between 25 and 75 C and it is desired to calibrate the bath as accurately as possible for operation within this range The current val ues for DO and DG are 25 229 and 186 974 respectively The calibration points are chosen to be 25 00 and 75 00 C The measured bath temperatures are 24 869 and 74 901 C respectively Refer to Figure 9 for applying equations to the example data and computing the new probe constants 49 11 11 Maintenance Maintenance The calibration instrument has been designed with the utmost care Ease of op eration and simplicity of maintenance have been a central theme in the product development Therefore with proper care the instrument should require very little maintenance Avoid operating the instrument in dirty or dusty environments A battery 1s used to maintain operating parameters in the unit All operat ing parameters including calibration parameters should be checked on a regular basis to insure accuracy and proper operation of the instrument See the troubleshooting section for the procedure on checking the status of the battery The bath should be cleaned regularly to prevent a buildup of o
36. ermometer liquid level is a hole in the lid for filling and removing of liquid checking liquid level and for mounting a thermometer A hole may be drilled in the rubber stopper supplied for inserting a thermometer into the bath 3 The rectangular access hole on the standard lid may be used to insert the users device to be thermostated To obtain specified control levels this hole must be covered to prevent thermal disturbance to the bath Covers may be purchased separately from Hart Scientific 3 Thecirculation inlet outlet on the optional pump lid is the access area or the inlet and outlet for the circulation pump Standard Lid Optional Pump Lid Figure 5 Lid Options 4 The stirrer pump motor drives the stirring propellers to provide mixing of the bath fluid Proper mixing of the fluid 1s important for good con 23 7011 Calibration Bath User s Guide stant temperature stability and uniformity The stir motor power cord plugs into the back of the bath at the power socket labeled STIRRER 5 The probe hole is for the temperature controller probe The probe must be in this hole for the bath to operate 24 8 1 8 1 1 8 General Operation Heat Transfer Fluid General Operation Heat Transfer Fluid Many fluids will work with the 7011 bath Choosing a fluid requires consider ation of many important characteristics of the fluid Among these are tempera ture range viscosity specific heat thermal
37. essarily 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 in side the tank and the open cup represents the vapors escaping the tank Oxygen and an ignition source will be less available inside the tank Environmentally hazardous fluids require special disposal according to applica ble federal or local laws after use 8 1 10 8 1 10 1 8 1 10 2 8 1 10 3 8 1 10 4 8 General Operation Heat Transfer Fluid Fluid Lifetime Many fluids degrade over time because of evaporation water absorption gel ling or chemical breakdown Often the degradation becomes significant near the upper temperature limit of the fluid Cost Cost of bath fluids may vary greatly from cents per gallon for water to hun dreds of dollars per gallon for synthetic oils Cost may be an important consid eration when choosing a fluid Commonly Used Fluids Below is a description of some of the more commonly used fluids and their characteristics Water Water is often used because of its very low cost availability and excellent tem perature control characteristics Water has very low viscosity and good thermal conductivity and heat capacity which makes it among the best fluids for control stability at low temperatures Temperature s
38. ets of configuration parameters probe parameters oper ating parameters serial interface parameters IEEE 488 interface parameters and controller calibration parameters The menus are selected using the UP and DOWN keys and then pressing SET Probe Parameters Menu The probe parameter menu 1s indicated by P OBE i Probe parameters menu Press SET to enter the menu The probe parameters menu contains the pa rameters DO and DG which characterize the transfer function of the linearized thermistor control probe These parameters may be adjusted to improve the ac curacy of the bath This procedure is explained in detail in Section 10 The probe parameters are accessed by pressing SET after the name of the pa rameter is displayed The value of the parameter may be changed using the UP and DOWN buttons After the desired value 1s reached press SET to set the parameter to the new value Pressing EXIT will cause the parameter to be skipped ignoring any changes that may have been made DO This probe parameter refers to the temperature at which the control probe out put would be 0 Normally this 1s set for 25 229 DG This probe parameter refers to the temperature span of the probe between O and 100 output Normally this is set for 186 974 Operating Parameters The operating parameters menu 19 indicated by Pe Operating parameters menu Press SET to enter the menu The operating parameters menu
39. ew set point temperature Set the heater switch to position HIGH to allow the bath to more quickly reach a higher temperature The HIGH setting may be necessary to reach higher tem peratures and control at high temperatures When setting the set point temperature be careful not to exceed the temperature limit of the bath fluid The over temperature cutout should be correctly set to prevent this from happening see Section 9 8 If operating the bath below 45 C set the COOLING power switch to ON The cooling temperature may require adjustment to provide the proper amount of cooling See Section 8 5 To obtain optimum control stability adjust the proportional band as discussed in Section 9 7 13 9 1 9 2 9 3 5 Installation Bath Environment Installation Bath Environment The Model 7011 Bath 19 a precision instrument which should be located in an appropriate environment The location should be free of drafts extreme temper atures and temperature changes dirt etc The surface where the bath 1s placed must be level If used at higher temperatures where fluid vaporization is significant use of a fume hood is recommended CAUTION READ SECTION 6 ENTITLED BATH USE before placing the bath in service Incorrect handling can damage the bath and void the warranty This bath is not designed to be portable Therefore moving the bath once it has been installed should be kept to a minimum Never move a bath
40. hen power to the heater will be shut off and the bath will cool The bath will cool until it reaches a few degrees below the cutout set point temperature At this point the action of the cutout 1s determined by the setting of the cutout mode parameter The cutout has two selectable modes automatic reset or manual reset If the mode 19 set to automatic then the cutout will automatically reset itself when the bath temperature falls below the reset temperature allowing the bath to heat up again If the mode 1s set to manual then the heater will remain disabled until the user manually resets the cutout The cutout set point may be accessed within the secondary menu Press SET and EXIT to enter the secondary menu and show the heater power Then press SET twice to access the cutout set point T fexr Access heater power in secondary menu io Pct Heater power in percent To accept the new cutout set point press SET SET Accept cutout set point The next function is the configuration menu Press EXIT to resume display ing the bath temperature 43 7O11 Calibration Bath User s Guide 44 9 9 9 10 9 10 1 9 10 2 9 11 Controller Configuration The controller has a number of configuration and operating options and calibra tion parameters which are programmable via the front panel These are ac cessed from the secondary menu after the cutout set point function by pressing SET There are 5 s
41. il or dust Use a paint safe cleaning agent on all painted surfaces Solvents such as Trichloroethylene or Acetone may dull or dissolve the paint The stainless steel surfaces may be cleaned with solvents as necessary to remove oils The stirring motor should be clean to allow proper cooling Normally only the outside surfaces require any attention If the inside of the motor has become heavily loaded with oily dust blow it out with compressed air Follow normal safety procedures when using pressurized gasses Periodically check the fluid level 1n the bath to ensure that the level has not dropped A drop in the fluid level affects the stability of the bath Changes in fluid level are dependent upon several factors specific to the environment in which the equipment is used A schedule cannot be out lined to meet each environmental setting Therefore the first year the bath should be checked weekly with notes kept as to changes in bath fluid Af ter the first year the user can set up a maintenance schedule based on the data specific to the application Heat transfer medium lifetime is dependent upon the type of medium and the environment The fluid should be checked at least every month for the first year and regularly thereafter This fluid check provides a baseline for knowledge of bath operation with clean usable fluid Once some fluids have become compromised the break down can occur rapidly Particular attention should be paid to the visco
42. ily dusty or dirty environment The unit 1s a precision instrument Although it has been designed for opti mum durability and trouble free operation it must be handled with care Position the unit before the tank is filled with fluid Use the handles pro vided to move the unit Due to the weight of the compressor it may re quire two people to safely move the bath If two people are used place one person in the front and one person in the back of the unit carefully slide hands under the unit and lift in unison The area containing the com pressor will be heavier than the rest of the unit Do not move a unit filled with fluid Most probes have handle temperature limits Be sure that the probe handle temperature limit is not exceeded in the air above the instrument 1 Before You Start Authorized Service Centers 1 3 e The instrument and any thermometer probes used with it are sensitive in struments that can be easily damaged Always handle these devices with care Do not allow them to be dropped struck stressed or overheated COLD BATHS e Refrigerated baths require that the condensing coil be cleaned periodi cally Accumulation of dust and dirt on the condenser will result in pre mature failure of the compressor e Ifa mains supply power fluctuation occurs immediately turn off the in strument Power bumps from brown outs could damage the instrument Wait until the power has stabilized before re energizing the instrumen
43. ip of the probe must be well immersed in the fluid The probe connector is plugged into the rear of the bath into the socket labeled PROBE Power With the bath power switch off plug the bath into an AC mains outlet of the appropriate voltage frequency and current capacity See Section 3 1 Specifica tions for power details Be sure the stirring motor power cord is plugged into the STIRRER socket at the back of the bath 6 Bath Use General 6 1 6 2 Bath Use READ BEFORE PLACING THE BATH IN SERVICE The information in this section is for general information only It is not de signed to be the basis for calibration laboratory procedures Each laboratory will need to write their own specific procedures General Be sure to select the correct fluid for the temperature range of the calibration Bath fluids should be selected to operate safely with adequate thermal proper ties to meet the application requirements Also be aware that some fluids ex pand and could overflow the bath if not watched Refer to General Operation Section 8 for information specific to fluid selection and to the MSDS sheet specific to the fluid selected Generally baths are set to one temperature and used to calibrate probes only at that single temperature This means that the type of bath fluid does not have to change Additionally the bath can be left en ergized reducing the stress on the system The bath generates extreme temperatures
44. k panel label for the correct voltage and frequency prior to ener gizing the instrument 115 VAC 15 A 250 V slow blow 230 VAC 8 A 250 V slow blow 115 VAC 10 A 250 V fast blow 230 VAC 6 A 250 V fast blow OVERVOLTAGE Installation CATEGORY II Pollution Degree 2 per IEC 61010 1 7O11 Calibration Bath User s Guide 10 3 2 Environmental Conditions Although the instrument has been designed for optimum durability and trou ble free operation it must be handled with care The instrument should not be operated in an excessively dusty or dirty environment Maintenance and clean ing recommendations can be found in the Maintenance Section of this manual The instrument operates safely under the following conditions ambient temperature range 5 50 C 41 122 F ambient relative humidity maximum 80 for temperature lt 31 C de creasing linearly to 50 at 40 C pressure 75kPa 106kPa mains voltage within 10 of nominal vibrations in the calibration environment should be minimized altitude does not effect the performance or safety of the unit indoor use only 4 4 1 4 2 4 Quick Start Unpackin Quick Start A CAUTION READ SECTION 6 ENTITLED BATH USE before placing the bath in service Incorrect handling can damage the bath and void the warranty This section gives a brief summary of the steps required to set up and operate the 7011 bath This should be used as a general overview a
45. l price Fluke reserves the right to invoice Buyer for importation costs of repair replacement parts when product purchased in one country is submitted for repair in another country Fluke s warranty obligation is limited at Fluke s option to refund of the purchase price free of charge repair or replacement of a defective product which is returned to a Fluke authorized service center within the warranty period To obtain warranty service contact your nearest Fluke authorized service center to obtain return authorization information then send the product to that service center with a description of the difficulty postage and insurance prepaid FOB Destination Fluke assumes no risk for damage in transit Following warranty repair the product will be returned to Buyer transportation prepaid FOB Destination If Fluke determines that failure was caused by neglect misuse contamination alteration accident or abnormal condition of operation or handling including overvoltage failures caused by use outside the 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 WARRAN
46. lay Operation of the control ler using the front control panel is discussed in Section 9 When the controller is set to a new set point the bath will heat or cool to the new temperature Once the new temperature is reached the bath usually takes 10 15 minutes for the temperature to settle and stabilize There may be a small overshoot or undershoot of about 0 5 C 33 9 1 9 2 9 Controller Operation Bath Temperature Controller Operation This section discusses in detail how to operate the bath temperature controller using the front control panel Using the front panel key switches and LED dis play the user may monitor the bath temperature set the temperature set point in degrees C or F monitor the heater output power adjust the controller propor tional band set the cut out set point and program the probe calibration param eters operating parameters serial and IEEE 488 interface configuration and controller calibration parameters Operation is summarized in Figure 7 Bath Temperature The digital LED display on the front panel allows direct viewing of the actual bath temperature This temperature value is what 1s normally shown on the dis play The units C or F of the temperature value are displayed at the right For example 85 00 C i Bath temperature in degrees Celsius The temperature display function may be accessed from any other function by pressing the EXIT button Reset Cutout If the over temperatur
47. ller offers the tight control stability of an analog temperature controller as well as the flexibility and programmabil ity of a digital controller The bath temperature is monitored with a linearized thermistor 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 The bath is operable within the temperature range given in the specifications For protection against solid state relay failure or other circuit failure the micro controller will automatically turn off the heater with a second mechanical relay anytime the bath temperature 1s more than a certain amount above the set point temperature As a second protection device the controller is also equipped with a separate thermocouple temperature monitoring circuit which will shut off the heater if the temperature exceeds the cut out set point The controller allows the operator to set the bath temperature with high resolu tion set the cut out adjust the proportional band monitor the heater output power and program the controller configuration and calibration parameters The controller may be operated in temperature units of degrees Celsius or Fahr 8 General Operation Temperature Controller enheit The controller is operated and programmed from the front control panel using the four key switches and digital LED disp
48. me stability The control ler uses a micro controller to execute the many operating functions User interface is provided by the 8 digit LED display and four key switches The tank for the 7011 is stainless steel and holds 25 liters The 7011 uses a re frigeration system that is CFC free Figure 1 Bath Assembly 3 1 3 Specifications and Environmental Conditions Specifications Specifications and Environmental Conditions Specifications Range 10 C to 110 C 14 F to 230 F Stability 0 0008 C at 0 C ethanol 0 0008 C at 25 C water 0 003 C at 100 C oil 5012 Uniformity 0 003 C at 0 C ethanol 0 002 C at 25 C water Temperature Setting Set point Resolution Display Resolution Digital Setting Accuracy Digital Setting Repeatability Heaters Safety Cutout Access Opening Depth Wetted Parts Volume Weight Size Power System Fuse Heater Fuse Safety 0 004 C at 100 C oil 5012 Digital display with push button data entry 0 002 C high resolution mode 0 00003 C 0 01 C 1 C 0 005 C 500 and 1000 Watts Factory set high temperature 127 mm X 254 mm 5 X 10 305 mm 12 304 stainless steel 27 liters 7 2 gallons 56 7 kg 125 Ib 559 mm H X 686 mm W X 401 mm D 22 X 27 X 15 8 115 VAC 410 60 Hz 1570 W 230 VAC 10 60 Hz 1570 W 50 Hz Optional NOTE If voltage is outside 10 VAC the compressor may be damaged Check the bac
49. nd reference and not as a substitute for the remainder of the manual Please read Sections 5 through 7 carefully before operating the bath Unpacking Unpack the bath carefully and inspect it for any damage that may have oc curred during shipment If there is shipping damage notify the carrier immediately Verify that all components are present e 7011 Bath e Access Hole Cover e Controller Probe e User s Guide e Report of Test e Fill Hole Cover e Power Cord e Drain Elbow If you are missing any item please contact an Authorized Service Center Set Up Set up of the bath requires careful unpacking and placement of the bath filling the bath with fluid installing the probe and connecting power Consult Section 5 for detailed instructions for proper installation of the bath Be sure to place the bath 1n a safe clean and level location Fill the bath tank with an appropriate liquid For operation at moderate bath temperatures clean distilled water works well Carefully pour the fluid into the bath tank through the large rectangular access hole above the tank avoiding spilling any fluid The fluid must not exceed a height of 3 4 inch below the bath lid The control probe must be inserted through the lid 1nto the bath and plugged into the socket at the back of the bath 11 7011 Calibration Bath User s Guide 12 4 3 4 4 Power Plug the bath power cord into a mains outlet of the proper voltage frequency
50. ore to reset the cutout SET Reset cutout This will also switch the display to the set temperature function To return to displaying the temperature press the EXIT button If the cutout is still in the over temperature fault condition the display will continue to flash Cutout The bath temperature must drop a few degrees below the cutout set point be fore the cutout can be reset Temperature Set point The bath temperature can be set to any value within the range and with resolu tion as given in the specifications The temperature range of the particular fluid used in the bath must be known by the operator and the bath should only be op erated well below the upper temperature limit of the liquid In addition the cutout temperature should also be set below the upper limit of the fluid Setting the bath temperature involves three steps 1 select the set point mem ory 2 adjust the set point value and 3 adjust the vernier if desired Programmable Set points The controller stores 8 set point temperatures in memory The set points can be quickly recalled to conveniently set the bath to a previously programmed tem perature set point To set the bath temperature one must first select the set point memory This function is accessed from the temperature display function by pressing SET The number of the set point memory currently being used is shown at the left on the display followed by the current set point value 8
51. pacted 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 29 7O11 Calibration Bath User s Guide 100 C 0 C 100 C 200 C 300 C 400 C 500 C 600 C Silicone Oil e 1060 FL 302 C e O Silicone Oil S 5014 ER 280 C Silicone Oil 5013 10 CS FL 232 C Silicone Oil 5012 y D FL 211 C e Silicone Oil 5019 10 CS PP M FL 133 C HFE 7500 5023 10 CS i p O OO N E waaraan MN T 5011 1062 S j Ethanol 10 CS FL 16 C Ethylene Glycol 5020 DES 7 Dynalene HF LO o 5022 N 10 CS FL 60 C AE Decomposition Starts Legend Shaded area represents usable range of fluid starting at BP Boiling Point 50 centistokes Lighter shading represents decreasing CS Centistokes viscosity while vaporization and decomposition increase Gi Gaat Point uid loss due to evaporation FL Flash Point FR Freeze Point PP Pour Point Black area represents liquid range with excessive viscosity Range over which a fume hood is recommended Figure 6 Chart of various bath fluids and their properties ventilation of the facility where the bath 19 located and other conditions We as sume the bath is well covered at this point This is also subject to company policy Flash Point The point at which ignition may occur
52. perature con troller probe 2 The stirrer power is provided for the stirring motor 3 Thesystem fuses internal 4 The power inlet 5 The serial number is located at the upper right corner of the back panel When consulting with an Authorized Service Center use the serial num ber and the model number 6 A drain valve is provided for ease of removing the fluid media from the bath Always use a container of adequate size to hold the FULL LOAD of fluid Some oils are more easily drained at a higher temperature WARNING Extreme caution must be maintained to prevent harm to the user or the surrounding environment Insulate the container from the floor or other objects that may be damaged by high temperatures as required 21 7O11 Calibration Bath User s Guide D O E u a al E a EEN D Figure 4 Back Panel 7 The model and power are located on the label near the top of the back panel When consulting with the factory use the model number 7 4 Lid There are two different types of lids They all have the same overall dimensions but the optional lid see Figure 5 has a recirculating pump and the standard lid has a stirring motor with rectangular access hole Their features are described with reference to figure numbers as follows 1 The top half of the latch which attaches the lid to the bath There are two latches one on the front and one on the back 22 7 Parts and Controls Lid 2 The th
53. r F 000000 Current vernier value in C To adjust the vernier press UP or DOWN Unlike most functions the ver nier setting has immediate effect as the vernier 1s adjusted SET need not be pressed This allows one to continually adjust the bath temperature with the vernier as it is displayed 000098 New vernier setting Next press EXIT to return to the temperature display or SET to access the temperature scale units selection 9 4 9 Controller Operation Temperature Scale Units SET Access scale units Temperature Scale Units The temperature scale units of the controller may be set by the user to degrees Celsius C or Fahrenheit F The units will be used in displaying the bath temperature set point vernier proportional band and cutout set point The temperature scale units selection is accessed after the vernier adjustment function by pressing SET From the temperature display function access the units selection by pressing SET 4 times 25 00 C i Bath temperature SET Access set point memory o 25 9 Set point memory SET Access set point value Press SET to accept the new selection and resume displaying the bath temperature SET Set the new units and resume temperature display 39 7O11 Calibration Bath User s Guide 40 9 5 9 6 9 7 Secondary Menu Functions which are used less often are accessed within the secondary menu The secondary menu is accessed by pressing
54. ratic behavior may exist The probe is located inside the stirrer motor cover e Check for a damaged probe or poor connection between the probe and bath e Intermittent shorts in the heater or controller electronic circuitry may also be a possible cause Contact an Au thorized Service Center See Section 1 3 on page 5 for assistance 57 7011 Calibration Bath User s Guide 58 12 2 12 2 1 12 2 2 Problem The bath does not achieve low temperatures The controller does not maintain controller parameters or parame ters are reset each time the power to the unit is removed Comments EMC Directive Causes and Solutions Too much heating or not enough cooling can cause this problem e Check that the control indicator glows green showing that the controller is attempting to cool The heaters may be disabled as a test by temporarily removing the heater fuses Note Before performing the memory check you need to record the controller calibration parameters found in the CAL menu of the instru ment and any user adjusted parameters that you have changed such as the programmable set points and proportional band Memory Check Doing a memory check is the easiest way to verify the ability of the battery to maintain controller parameters 1 Power off the instrument 2 Disconnect the instrument from AC power for 10 seconds 3 Reconnect the AC power and power on the instrument 4 f the display shows InlT and or the
55. require adjustment for best bath stability when any of these conditions change Of these the most significant factors affecting the op timum proportional band width are heater power setting and fluid viscosity The proportional band should be wider when the higher power setting is used so that the change in output power per change in temperature remains the same The proportional band should also be wider when the fluid viscosity is higher because of the increased response time The proportional band width is easily adjusted from the bath front panel The width may be set to discrete values in degrees C or F depending on the selected units The optimum proportional band width setting may be determined by monitoring the stability with a high resolution thermometer or with the control ler percent output power display Narrow the proportional band width to the point at which the bath temperature begins to oscillate and then increase the band width from this point to 3 or 4 times wider Table 3 lists typical propor tional band settings for optimum performance with a variety of fluids at se lected temperatures The proportional band adjustment may be accessed within the secondary menu Press SET and EXIT to enter the secondary menu and show the heater power Then press SET to access the proportional band ser T fexr Access heater power in secondary menu 41 7O11 Calibration Bath User s Guide 42 9 8 Table 3 Proportional Band
56. robe 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 1s kept covered In preparing to use the bath for calibration start by e Placing the reference probe in the bath working area e Placing the probe to be calibrated the UUT in the bath working area as close as feasibly possible to the reference probe Calibration of Multiple Probes Fully loading the bath with probes increases the time required for the tempera ture to stabilize after inserting the probes Using the reference probe as the guide be sure that the temperature has stabilized before starting the calibration 7 Parts and Controls Front Control Panel 7 Parts and Controls 7 1 Front Control Panel The following controls and indicators are present on the controller front panel see Figure 2 below 1 the digital LED display 2 the control buttons 3 the bath on off power switch 4 the control indicator light 5 the heater power switch and 6 the cooling power switch 1 The digital display is an important part of the temperature controller be cause it not only displays set and actual temperatures but also various bath functions settings and constants The display shows temperatures in values ac cording to the selected scale units C or F 2 The control buttons SET DOWN UP and EXIT are used to set the bath temperature setpoint access and set
57. rt Safety Information period of 2 hours before it can be assumed to meet all of the safety re quirements of the IEC 1010 1 If the product 19 wet or has been in a wet environment take necessary measures to remove moisture prior to apply ing power such as storage in a low humidity temperature chamber operat ing at 50 degree centigrade for 4 hours or more e DO NOT operate high temperature baths 500 C near flammable materi als Extreme temperatures could ignite the flammable material e Overhead clearance is required Do not place the instrument under a cabi net or other structure Always leave enough clearance to allow for safe and easy insertion and removal of probes e The instrument is intended for indoor use only BURN HAZARD e Extremely cold temperatures may be present in this equipment Freezer burns and frostbite may result if personnel fail to observe safety precau tions e High temperatures may be present in this equipment Fires and severe burns may result if personnel fail to observe safety precautions ELECTRICAL HAZARD e These guidelines must be followed to ensure that the safety mechanisms in this instrument will operate properly This mains supply for the instru ment must be capable of supplying power to the instrument as listed 1n 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 pl
58. s power has been applied to the bath Also briefly displayed 1s data which indicates the controller hardware configuration This data is used in some circumstances for diagnostic purposes Heater The power to the bath heater is precisely controlled by the temperature control ler to maintain a constant bath temperature Power is controlled by periodically switching the heater on for a certain amount of time using a solid state relay The front panel red green control indicator shows the state of the heater The control indicator glows red when the heater is on and glows green when the heater 1s off The indicator will pulse constantly when the bath is maintaining a stable temperature The heater has two power level settings The HIGH heater power setting is used to quickly heat up the bath fluid to the desired operating temperature The HIGH heater power setting may also be required for control at high tempera tures The LOW setting is used for control at lower temperatures and for scanning at slower rates When controlling at the HIGH heater power setting instead of LOW the proportional band may need to be increased typically by a factor of four to compensate for the increase in power gain Otherwise the temperature may oscillate 31 7O11 Calibration Bath User s Guide 32 8 5 8 6 Cooling The BACK PRESSURE control valve limits the cooling capacity of the unit It will normally be open all the way
59. scosities greater than this cause very poor control stability and may also overheat or damage the stirring motor With oils viscosity may vary greatly with temperature When using fluids with higher viscosities the controller proportional band may need to be increased to compensate for the reduced response time Otherwise the temperature may begin to oscillate Specific Heat Specific heat is the measure of the heat storage ability of the fluid Specific heat though to a lesser degree also affects the control stability It also affects the heating and cooling rates Generally a lower specific heat causes slightly better control stability and quicker heating and cooling With fluids with higher specific heat the controller may require a decreased proportional band to com pensate for the decrease in sensitivity of the bath temperature to heat input 25 7O11 Calibration Bath User s Guide 26 8 1 4 8 1 5 8 1 6 8 1 7 Thermal Conductivity Thermal conductivity measures how easily heat flows through the fluid Ther mal conductivity of the fluid affects the control stability temperature unifor mity and probe temperature settling time Fluids with higher conductivity distribute heat more quickly and evenly improving bath performance Thermal Expansion Thermal expansion describes how the volume of the fluid changes with temper ature Thermal expansion of the fluid used must be considered since the in crease in fluid vol
60. scribed in the problem The display flashes cutout and an incorrect process tem perature e Check that the control probe has not been struck bent or damaged If the cause of the problem remains un known contact an Authorized Service Center see Sec tion 1 3 on page 5 for assistance The controller shows that the out put power is steady but the pro cess temperature is unstable The controller alternately heats for a while then cools Possible causes are an improper proportional band setting or the fluid being used e f the bath temperature does not achieve the expected degree of stability when measured using a thermometer try adjusting the proportional band to a narrower width as discussed in Section 9 7 Proportional Band e Check to ensure the fluid has not deteriorated or is not too thick The bath is not stable and the duty cycle is not constant e he proportional band being too narrow typically causes this oscillation Increase the width of the proportional band until the temperature stabilizes as discussed in Section 9 7 Proportional Band The controller erratically heats then cools control is unstable If both the bath temperature and output power do not vary periodically but in a very erratic manner the problem may be excess noise in the system Noise due to the control sensor should be less than 0 001 C However if the probe has been damaged or has developed an inter mittent short er
61. sity of the fluid A significant change in the viscosity can indicate that the fluid is contaminated being used out side of its temperature limits contains ice particles or is close to a chemi cal break down Once data has been gathered a specific maintenance schedule can be outline for the instrument Refer to the General Operation section Section 8 for more information about the different types of flu ids used in calibration baths If a hazardous material is spilt on or inside the equipment the user is re sponsible for taking the appropriate decontamination steps as out lined by the national safety council with respect to the material MSDS sheets ap plicable to all fluids used in the baths should be kept in close proximity to the instrument 51 7O11 Calibration Bath User s Guide 52 11 1 e Ifthe mains supply cord becomes damaged replace it with a cord with the appropriate gauge wire for the current of the bath If there are any questions contact an Authorized Service Center for more information e Before using any cleaning or decontamination method except those rec ommended by Hart users should check with an Authorized Service Center to be sure that the proposed method will not damage the equip ment e If the instrument is used in a manner not in accordance with the equip ment design the operation of the bath may be impaired or safety hazards may arise N WARNING When checking the over temperature cutout
62. t 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 3 1 402 675321 E mail ServiceDesk fluke nl Fluke Int l Corporation Service Center Instrimpex Room 2301 Sciteck Tower 22 Jianguomenwai Dajie Chao Yang District 7011 Calibration Bath User s Guide Beijing 100004 PRC CHINA Phone 86 10 6 512 3436 Telefax 86 10 6 5 12 3437 E mail xingye han fluke com cn Fluke South East Asia Pte Ltd Fluke ASEAN Regional Office Service Center 60 Alexandra Terrace 03 16 The Comtech Lobby D 118502 SINGAPORE Phone 65 6799 5588 Telefax 65 6799 5588 E mail antng Osinga 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 2 Introduction 2 Introduction The Hart Scientific 7011 bath 1s a very precise constant temperature bath An innovative state of the art solid state temperature controller has been incorpo rated which maintains the bath temperature with extre
63. t out and an incorrect process temperature e Normally the cutout disconnects power to the heater when the bath temperature exceeds the cutout set point causing the temperature to drop back down to a safe value If the cutout mode is set to AUTO the heater switches back on when the temperature drops If the mode is set to RESET the heater only comes on again when the temperature is reduced and the cutout is man ually reset by the operator see Section 9 8 Cutout Check that the cutout set point is adjusted to 10 or 20 C above the maximum bath operating temperature and that the cutout mode is set as desired e f the cutout activates when the bath temperature is well below the cutout set point or the cutout does not reset when the bath temperature drops and it is manually re set then the cutout circuitry or the cutout thermocouple sensor may be faulty or disconnected Contact an Au thorized Service Center see Section 1 3 on page 5 for assistance Do 7011 Calibration Bath User s Guide 56 Problem The display flashes cutout and an incorrect process temperature The displayed process tempera ture is in error and the controller remains in the cooling or the heating state at any set point value Causes and Solutions The problem may be that the controller s voltmeter circuit is not func tioning properly e A problem could exist with the memory back up battery If the battery voltage is insufficient
64. tability is much poorer at higher temperatures because water condenses on the lid cools and drips into the bath Water 1s safe and relatively inert The electrical conductivity of water may pre vent its use in some applications Water has a limited temperature range from a few degrees above 0 C to a few degrees below 100 C At higher temperatures evaporation becomes significant Water used in the bath should be distilled or softened to prevent mineral deposits Consider using an algicide chemical in the water to prevent contamination Ethylene Glycol The temperature range of water may be extended by using a solution of part water and 1 part ethylene glycol antifreeze The characteristics of the ethylene elycol water solution are similar to water Use caution with ethylene glycol since the fluid is very toxic Ethylene glycol must be disposed of properly Methanol Methanol or methyl alcohol is often used at low temperatures below 0 C Methanol 1s relatively inexpensive has good control characteristics and has a low freeze point Methanol 19 very toxic so care must be taken when using and disposing of this fluid Mineral Oil Mineral oil or paraffin oil 1s often used at moderate temperatures above the range of water Mineral oil 1s relatively inexpensive At lower temperatures mineral oil 19 quite viscous and control may be poor At higher temperatures vapor emission becomes significant The vapors may be dangerous and use of a 27
65. that is full of fluid This action could be extremely danger ous and could result in personal injury to the person moving the bath If the bath is going to be placed in an area where it will need to be moved fre quently a special cart can be designed to accommodate the bath Thus making the bath much more portable Hart sells carts designed for these baths How ever even with a cart the bath should not be moved full of hot fluid The fluid can splash causing injury or if the bath and cart tip the fluid could cause damage to the surrounding area and personal injury to personnel If the bath must be moved be sure to drain the fluid to prevent any injury The side of the bath with the compressor is heavier than the tank side To safely move the bath two people are required Dry out Period Before initial use after transport and any time the instrument has not been en ergized for more than 10 days the bath will need to be energized for a dry out period of 1 2 hours before it can be assumed to meet all of the safety requirements of the IEC 1010 1 Bath Preparation and Filling The Model 7011 Bath 19 not provided with a fluid Various fluids are available from Hart Scientific and other sources Depending on the desired temperature range any of the following fluids as well as others may be used in the bath e Water e Ethylene Glycol Water 15 7O11 Calibration Bath User s Guide 16 9 4 9 0 e Methanol e
66. ting 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 probe seems faulty or the problem cannot otherwise be solved contact an Authorized Service Center see Section 1 3 on page 5 for assistance Be sure to have the instrument model number serial number voltage and problem de scription available Problem Causes and Solutions The heater indicator LED stays The display does not show ut aut nor displays an incorrect bath red but the temperature does not temperature and the controller otherwise appears to operate nor increase mally The problem may be insufficient heating no heating at all or too much cooling e he heater power setting being too low especially at higher operating e One or more burned out heaters or blown heater fuses may also cause this problem If the heaters seem to be burned out contact an Authorized Service Center see Section 1 3 on page 5 for assistance The controller display flashes The display flashs ut o ut alternately with the process Cut out and the heater does temperature not operate e f the process temperature displayed seems grossly in error consult the following problem The display flashes Cu
67. tional band At the bot tom of the proportional band the heater output is 100 At the top of the pro portional band the heater output is O Thus as the bath temperature rises the heater power is reduced which consequently tends to lower the temperature back down In this way the temperature 1s maintained at a fairly constant temperature The temperature stability of the bath depends on the width of the proportional band See Figure 8 If the band 1s too wide the bath temperature will deviate ex cessively from the set point due to varying external conditions This is because the power output changes very little with temperature and the controller cannot respond very well to changing conditions or noise in the system If the propor 9 Controller Operation Proportional Band tional band is too narrow the bath temperature may swing back and forth be cause the controller overreacts to temperature variations For best control stability the proportional band must be set for the optimum width AAT NE Proportional Band too Narrow Proportional Band too Wide Optimum Proportional Band ES EEE EEE EEE EEE A Figure 8 Bath temperature fluctuation at various proportional band settings The optimum proportional band width depends on several factors among which are fluid volume fluid characteristics viscosity specific heat thermal conduc tivity heater power setting operating temperature and stirring Thus the pro portional band width may
68. ugged directly into a properly grounded three prong receptacle The receptacle must be installed in accordance with local codes and ordinances Consult a qualified electrician DO NOT use an extension cord or adapter plug e DO use a ground fault interrupt device This unit contains a liquid A ground fault device 1s advised in case liquid 1s present in the electrical system and could cause an electrical shock e Always replace the power cord with an approved cord of the correct rat ing and type If you have questions contact an Authorized Service Center see Section 1 3 e High voltage is used in the operation of this equipment Severe injury or death may result 1f personnel fail to observe the safety precautions Before working inside the equipment turn off the power and disconnect the power cord BATH FLUIDS e 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 7011 Calibration Bath User s Guide The instrument is equipped with a soft cutout user settable firmware and a hard cutout set at the factory Check the flash point boiling point or other fluid characteristic applicable to the circumstances of the unit opera tion Ensure that the soft cutout 1s adjusted to the fluid characteristics of the application As a guideline the soft cutout should be set 10 C to
69. ume as the bath temperature changes may cause overflow Excessive thermal expansion may also be undesirable in applications where constant liquid level 1s important Oils typically have significant thermal expansion Electrical Resistivity Electrical resistivity describes how well the fluid insulates against the flow of electric current In some applications such as measuring the resistance of bare temperature sensors it may be important that little or no electrical leakage oc cur through the fluid In this case consider a fluid with very high resistivity Safety When choosing a fluid always consider the safety issues associated Obviously where there are extreme temperatures there can be danger to personnel and equipment Fluids may also be hazardous for other reasons Some fluids may be considered toxic Contact with eyes skin or inhalation of vapors may cause injury A proper fume hood must be used if hazardous or bothersome vapors are produced WARNING Fluids at high temperatures May pose danger from BURNS FIRE and TOXIC fumes Use appropriate caution and safety equipment Fluids may be flammable and require special fire safety equipment and proce dures An important characteristic of the fluid to consider 1s the flash point The flash point is the temperature at which there 1s sufficient vapor given off so that when there is sufficient oxygen present and an ignition source 1s applied the va por will ignite This does not nec

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