7320 Users Guide 5A2803 FontF
Contents
1. Calibration 7320 Calibration Bath User s Guide PN 3720888 February 2013 2013 Fluke Corporation All rights reserved Specifications are subject to change without notice All product names are trademarks of their respective companies Table of Contents L Before You Start lt e ecce a eanes ORO A 1 1 1 Symbols Used z 4 3 goera i a saiia e aaa ee ge a 1 12 Safety Information s ue ss saccamana raa seda Re cx dos 2 1 2 1 Ei Sa an cod A A A are 2 1 2 2 enm mr rat ee ave at ee he O ak Pee 4 1 3 Authorized Service Centers goo ox ae xk s 5 2 Introduction lt ss ee 45 44 04 66 A REGE ROS 9 3 Specifications and Environmental Conditions 11 3 1 Specifications MT 11 3 4 Environmental Conditions ss 24 lt lt o 0 os 12 3 3 Warranty 22 22 Se Er Ra Peewee ee x A ewe Ree de 12 4 Quick Start es sock ox 8 a e ee RO Re Rmo eni 13 4 1 nr crm 13 42 dee uic 3 ew SESS eae she VE WSS 9 934 13 4 3 POWT 2202 a ma i a ee wo VR S up de ah 14 4 4 EU qo Temperature na we eK Bra o EX ee ew 14 gt BALUARTE Oe OS 17 34 General M 17 3 2 Comparison Calibration a uoo ei a RARA 17 5 3 Calibration of Multiple Probes 18 6 CalibrationProcedure len 19 6 1 Calibration Poms 2 299 3 9 3 8 39 dox ARA 19 6 2 Measuring the Set polnt Error 2 222206 4 Y ee oa aes 19 6 3 Computing RO and ALPHA 244 4 04 305 0 08 wach 19 6 4 Calibration Example s v o R2. 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 If the cutout activates when the bath temperature is well below the cutout set point or the cutout does not reset when the bath tempera ture drops and it is manually reset then the cutout circuitry or the cut out thermocouple sensor may be faulty or disconnected Contact a Hart Authorized Service Center see Section 1 3 for assistance 27 User s Guide Problem Causes and Solutions The display flashes cutout and an incorrect process temperature The problem may be that the controller s voltmeter circuit is not func tioning properly A problem could exist with the memory back up bat tery If the battery voltage is insufficient to maintain the memory data may become scrambled causing problems A nearby large static dis charge may also affect data in memory Holding the SET and EXIT keys down while power to the controller is switched on may reset the memory The display shows init in dicating the memory is being initialized At this point each of the con troller parameters and calibration constants must be reprogrammed into memory You can obtain the calibration constants from Report of Test If the problem reoccurs the battery should be replaced Contact a Hart Authorized Service Center see Section 1 3 for assistance If initializing the memo
3. in Hart s sole opinion has been subject to misuse alteration abuse or abnormal conditions of operation or handling Software is warranted to operate in accordance with its programmed instruc tions on appropriate Hart products It is not warranted to be error free Hart s obligation under this warranty is limited to repair or replacement of a product which is returned to Hart within the warranty period and is deter mined upon examination by Hart to be defective If Hart determines that the defect or malfunction has been caused by misuse alteration abuse or abnormal conditions or operation or handling Hart will repair the product and bill the purchaser for the reasonable cost of repair To exercise this warranty the purchaser must forward the product after calling or writing an Authorized Service Center see Section 1 3 for authorization The Service Center assumes NO risk for in transit damage THE FOREGOING WARRANTY IS PURCHASER S SOLE AND EXCLU SIVE REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES EX PRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OR MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE OR USE HART SHALL NOT BE LIABLE FOR ANY SPECIAL INDIRECT INCIDENTAL OR CONSEQUENTIAL DAM AGES OR LOSS WHETHER IN CONTRACT TORT OR OTHERWISE 4 Quick Start Unpacking 4 4 1 4 2 Quick Start A CAUTION Read Section 5 6 entitled BATH USE before placing the bath in service This chapt
4. operation of the condensing coil and thus compromise the performance and lifetime of the cooling system To clean or check the internal parts remove the four screws on the fornt panel display Remove the two screws under the front panel on the left and right sides Pull the front panel up and out to remove 25 User s Guide 26 If a hazardous material is spilt on or inside the equipment the user is re sponsible for taking the appropriate decontamination steps as outlined by the national safety council with respect to the material MSDS sheets ap plicable to all fluids used in the baths should be kept in close proximity to the instrument If the mains supply cord becomes damaged replace it with a cord with the appropriate gauge wire for the current of the bath If there are any questions call a Hart Authorized Service Center see Section 1 3 for more information Before using any cleaning or decontamination method except those rec ommended by Hart users should check with an Authorized Service Cen ter see Section 1 3 to be sure that the proposed method does not damage the equipment If the instrument is used in a manner not in accordance with the equip ment design the operation of the bath may be impaired or safety hazards may arise The over temperature cutout should be checked every 6 months to see that it is working properly In order to check the user selected cutout follow the controller directions Section 9
5. 2 liters Weight 78 lb 35 4 kg Size 12 x 24 5 x 23 305 mm x 622 mm x 584 mm Safety OVERVOLTAGE Installation CATEGORY II Pollution Degree 2 per IEC 1010 1 Cooling Capacity 600 BTU h Refrigeration R 507 single stage Interface Package RS 232 included IEEE 488 optional Rated at listed 115 V or optional 230 V 11 User s Guide 12 3 2 3 3 Environmental Conditions Although the instrument has been designed for optimum durability and trou ble free operation it must be handled with care The instrument should not be operated in an excessively dusty or dirty environment Maintenance and clean ing recommendations can be found in the Maintenance Section of this manual The instrument operates safely under the following conditions e temperature range 5 40 C 41 104 F e ambient relative humidity maximum 80 for temperatures lt 31 C de creasing linearly to 50 at 40 C e pressure 75kPa 106kPa e mains voltage within 10 of nominal e vibrations in the calibration environment should be minimized e altitudes less than 2000 meters e indoor use only Warranty Fluke Corporation Hart Scientific Division Hart warrants this product to be free from defects in material and workmanship under normal use and service for a period as stated in our current product catalog from the date of shipment This warranty extends only to the original purchaser and shall not apply to any product which
6. 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 30
7. probe and the probe s to be calibrated as closely grouped as possible in the working area of the bath Bath stability is maximized when the bath working area is kept covered In preparing to use the bath for calibration start by e Placing the reference probe in the bath working area e Placing the probe to be calibrated the UUT in the bath working area as close as feasibly possible to the reference probe Calibration of Multiple Probes Fully loading the bath with probes increases the time required for the tempera ture to stabilize after inserting the probes Using the reference probe as the guide ensures that the temperature has stabilized before starting the calibration 6 Calibration Procedure Calibration Points 6 1 6 2 6 3 Calibration Procedure In some instances the user may want to calibrate the bath to improve the tem perature set point accuracy Calibration is done by adjusting the controller probe calibration constants RO and ALPHA so that the temperature of the bath as measured with a standard thermometer agrees more closely with the bath set point The thermometer used must be able to measure the bath fluid temper ature with higher accuracy than the desired accuracy of the bath By using a good thermometer and carefully following procedure the bath can be calibrated to an accuracy of better than 0 02 C over a range of 100 degrees Calibration Points In calibrating the bath RO and ALPHA are adjusted to min
8. the flash point boiling point or other fluid characteristic applicable to the circumstances of the unit operation Ensure that the soft cutout is adjusted to the fluid characteristics of the ap plication 1 2 2 A Cautions To avoid possible damage to the instrument follow these guidelines THE DRAIN VALVE MUST BE INSTALLED ON THE BACK OF THE BATH BEFORE ATTEMPTING TO FILL THE TANK WITH FLUID See Section 5 3 page 17 for drain installation instructions Always operate this instrument at room temperature between 41 F and 104 F 5 C to 40 C Allow sufficient air circulation by leaving at least 6 inches 15 cm 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 5 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 is important to the safety and proper operation of the unit The refrigeration may be damaged or the lifetime shortened if the set point temperature is set above 60 C for more than one hour with the refrigeration manually on Ensure that the refrigeration is off when the unit is used above 60 C The Factory Reset Sequence should be performed only by authori
9. 8 Cutout for setting the cutout Both the manual 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 cutout and if the temperature is decreasing Note When checking the over temperature cutout be sure that the tem perature limits of the bath fluid are not exceeded Exceeding the tempera ture limits of the bath fluid could cause harm to the operator lab and instrument 9 Troubleshooting Troubleshooting 9 1 Troubleshooting This section contains information on troubleshooting CE Comments and a wiring diagram This information pertains to a number of bath models and cer tain specifics may not pertain to your model Troubleshooting In the event that the instrument appears to function abnormally this section may help to find and solve the problem Several possible problem conditions are described along with likely causes and solutions If a problem arises please 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 for assistance Be sure to have the model number and serial number of your instrument available Problem Causes and Solutions The heater indicator LED stays The display does not show cutout nor displays an incorrect bath tem red but the temperature does not perature b
10. Band The controller alternately heats for a while then cools The proportional band being too narrow typically causes this oscilla tion 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 erratic behavior may exist Check for a damaged probe or poor connection between the probe and bath Intermittent shorts in the heater or controller electronic circuitry may also be a possible cause Contact a Hart Authorized Service Center see Section 1 3 for assistance The bath does not achieve low temperatures Too much heating or not enough cooling can cause this problem Check that the control indicator glows green showing that the control ler is attempting to cool The heaters may be disabled as a test by temporarily removing the heater fuses Insufficient cooling may be caused by lack of refrigerant because of a leak in the system Refer to the Charging Instructions Section 7 12 Check the sight glass to verify the presence of liquid refrigerant It may be difficult to tell if the glass is completely full or
11. acking and placement of the bath filling the bath with fluid and connecting power Consult Section 5 Installation for 13 User s Guide 14 4 3 4 4 detailed instructions for proper installation of the bath Be sure to place the bath in a safe clean and level location Fill the bath tank with an appropriate liquid For operation at moderate bath temperatures clean distilled water works well Carefully pour the fluid into the bath tank through the large rectangular access hole above the tank avoiding spilling any fluid The fluid must not exceed a height of 12 7 20 3 mm 0 5 0 8 inches below the bottom of the lid NOT the access cover Power Plug the bath power cord into a mains outlet of the proper voltage frequency and current capability Refer to Section 3 1 Specifications for power details Refer to and read the CAUTION at the front of the manual concerning brown out and over voltage protection Check the back panel label for the correct voltage and frequency prior to energizing the unit 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 set point The front panel LED display will indicate the actual bath temperature Set the cooling switch to OFF for temperatures above approximately 45 C Set the switch to ON for lower temperatures Setting the Temperature In the following discussion and throughout
12. ates extreme temperatures Precautions must be taken to prevent personal injury or damage to objects Probes may be extremely hot or cold when removed from the bath Cautiously handle probes to prevent personal in jury Carefully place probes on a heat cold resistant surface or rack until they are at room temperature It is advisable to wipe the probe with a clean soft cloth or paper towel before inserting it into another bath This prevents the mixing of fluids from one bath to another If the probe has been calibrated in liquid salt carefully wash the probe in warm water and dry completely before transferring it to another fluid Always be sure that the probe is completely dry before in serting it into a hot fluid Some of the high temperature fluids react violently to water or other liquid mediums Be aware that cleaning the probe can be danger ous if the probe has not cooled to room temperature Additionally high temper ature fluids may ignite the paper towels if the probe has not been cooled For optimum accuracy and stability allow the bath adequate stabilization time after reaching the set point temperature Comparison Calibration Comparison calibration involves testing a probe unit under test UUT against a reference probe After inserting the probes to be calibrated into the bath al low sufficient time for the probes to settle and the temperature of the bath to stabilize One of the significant dividends of using a bath rather t
13. ation DO NOT leave the system open for more than 15 minutes Polyolester oils are very hygroscopic Evacuate the system to a minimum of 200 microns Evacuate from both high and low sides of the system Schrader valves provide access to the system Charging After evacuation charge the system with approximately 160 grams of R 507 With the compressor running and the bath operating at 25 C verify that the suction pressure is 17 18 psi 23 8 Maintenance General 8 Maintenance 8 1 General e A battery is used to maintain operating parameters in the unit All operat ing parameters including calibration parameters should be checked on a regular basis to insure accuracy and proper operation of the instrument See the troubleshooting section for the procedure on checking the status of the battery e The calibration instrument has been designed with the utmost care Ease of operation and simplicity of maintenance have been a central theme in the product development Therefore with proper care the instrument should require very little maintenance Avoid operating the instrument in dirty or dusty environments e If the outside of the bath becomes soiled it may be wiped clean with a damp cloth and mild detergent Do not use harsh chemicals on the sur face which may damage the paint e Periodically check the fluid level in the bath to ensure that the level has not dropped A drop in the fluid level affects the stability of the bat
14. completely empty Verify by watching the glass while the compressor is being turned on The controller does not maintain controller parameters or parame ters are reset each time the power to the unit is removed Comments EMC Directive Note Before performing the memory check you need to record the controller calibration parameters found in the CAL menu of the instru ment and any user adjusted parameters that you have changed such as the programmable set points and proportional band Memory Check Doing a memory check is the easiest way to verify the ability of the battery to maintain controller parameters 1 Power off the instrument 2 Disconnect the instrument from AC power for 10 seconds 3 Reconnect the AC power and power on the instrument 4 If the display shows InIT and or the cycle count shows a low num ber such as 0002 the battery is spent and should be replaced Con tact an Authorized Service Center for assistance 5 After replacing the battery you must reprogram the calibration and user adjustable parameters into the controller 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 29 User s Guide 9 2 2 Low Voltage Directive Safety In order to comply with the European Low Voltage Directive 73 23 EEC
15. d to be compact and low cost without compromising performance The 7320 bath operates over a wide temperature range from 20 C to 150 C The refrigeration permits sub ambient temperature control 3 Specifications and Environmental Conditions Specifications 3 1 Specifications and Environmental Conditions Specifications Range 20 C to 150 C Stability 2 sigma 0 005 C at 20 C ethanol 0 005 C at 25 C water 0 007 C at 150 C silicone oil 5012 Uniformity 0 005 C at 20 C ethanol 0 005 C at 25 C water 0 010 C at 150 C silicone oil 5012 Heating Time 80 minutes from 25 C to 150 C silicone oil 5012 Cooling Time 100 minutes from 25 C to 20 C silicone oil 5012 Stabilization Time 15 20 minutes Temperature Setting Digital display with push button entry Set point Resolution 0 01 0 00018 in high resolution Display Temperature Resolution 0 01 Digital Setting Accuracy 0 5 C Digital Setting Repeatability 0 01 C Heater 650 Watts Access Opening 6 8 x 3 7 172mm x 94mm Depth 9 25 234 mm Wetted Parts 304 Stainless Steel Power 115 VAC 410 60 Hz 15 amps 230 VAC 10 50 Hz 8 amps optional 1100 W A Note If the voltage is outside 10 the compressor may be damaged Check the back panel label for the correct voltage and fre quency prior to energizing the unit Volume 2 4 gal 9
16. e repeated again to further im prove the accuracy Calibration Example The bath is to be used between 25 C 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 RO and ALPHA are 100 000 and 0 0038500 respectively The calibra tion points are chosen to be 30 00 and 80 00 C The measured bath temperatures are 29 843 and 79 914 C respectively Refer to Figure for apply ing equations to the example data and computing the new probe constants 6 Calibration Procedure Calibration Example RO 100 000 ALPHA 0 0038500 tj 30 00 C measured t 29 843 C ty 80 00 C measured t 79 914 C Compute errors err 29 843 30 00 C 0 157 C erry 79 914 80 00 C 0 086 C Compute RO mus E x 30 0 0 157 x 80 0 ie 0 00385 1 100 000 100 077 80 0 30 0 Compute ALPHA 1 0 00385 x 80 0 0 157 1 0 00385 x 30 0 0 086 ALPHA 80 0 30 0 0 00385 0 0038416 Figure 1 Calibration Example 21 7 Charging Instructions Leak Testing 7 1 7 2 7 3 Charging Instructions The 7320 uses R 507 refrigerant with a polyolester oil Care must be taken to avoid contamination from other types of refrigerants and oils Leak Testing Leak testing should be done with equipment designed for use with R 507 Bub ble or ultra sonic leak testing may be viable in some instances Evacu
17. er gives a brief summary of the steps required to set up and operate the bath This should be used as a general overview and reference and not as a substitute for the remainder of the manual Please read Section 5 Installation through Section 8 General Operation 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 immedi ately Verify that all components are present e 7320 Bath e RS 232 Cable e Access Hole Cover e Drain Valve e Manual e Report of Test If you are missing any item please call a Hart Authorized Service Center see Section 1 3 Set Up CAUTION The drain valve must be installed on the back of the bath be fore attempting to fill the tank with fluid See Section 5 3 on page 17 for drain installation instructions WARNING 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 operation Ensure that the soft cutout is adjusted to the fluid characteristics of the application As a guideline the soft cutout should be set 10 C to 15 C below the flash point of the bath fluid See Section 8 1 Heat Transfer Fluid for specific information on bath fluids and Section Cutout Set up of the bath requires careful unp
18. h Changes in fluid level are dependent upon several factors specific to the conditions in which the equipment is used A schedule cannot be outlined to meet each set of conditions Therefore the bath should be checked weekly and adjustments made as required e Heat transfer medium lifetime is dependent upon the type of medium and the conditions of use 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 rap idly Particular attention should be paid to the viscosity of the fluid A sig nificant change in the viscosity can indicate that the fluid is contaminated being used outside of its temperature limits contains ice particles or is close to a chemical breakdown Once data has been gathered a specific maintenance schedule can be outlined for the instrument Refer to Section 8 General Operation for more information about the different types of fluids used in calibration baths e Depending on the cleanliness of the environment the internal parts parts behind the front cover only of the cold bath should be cleaned and or checked at least every six months for dust and dirt Particular attention should be paid to the condensing coil fins The fins should be vacuumed or brushed free of dust and dirt on a regular basis Dust and dirt inhibit the
19. han a dry well to cali brate multiple probes is that the probes do not need to be identical in construc 17 User s Guide 18 5 3 tion The fluid in the bath allows different types of probes to be calibrated at the same time However stem effect from different types of probes is not to tally eliminated Even though all baths have horizontal and vertical gradients 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 20 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 starting at the highest temper ature and progressing down to the lowest temperature can generally achieve better results Probes can be held in place in the bath by using probe clamps or drilling holes in the access cover Other fixtures to hold the probes can be designed The ob ject is to keep the reference
20. imize 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 obtained when using bath temperatures which are just within the most useful operating range of the bath The further apart the calibration temperatures the larger will be the calibrated temperature range but the calibration error will also be greater over the range If for instance 0 C and 100 C are chosen as the cali bration temperatures then the bath may achieve an accuracy of maybe 0 03 C over the range 10 to 110 C Choosing 30 C and 70 C may allow the bath to have a better accuracy of maybe 0 01 C over the range 25 to 75 C but outside that range the accuracy may be only 0 05 C Measuring the Set point Error The first step in the calibration procedure is to measure the temperature errors including sign at the two calibration temperatures First set the bath to the lower set point which we will call t Wait for the bath to reach the set point and allow 15 minutes to stabilize at that temperature Check the bath stability with the thermometer When both the bath and the thermometer have stabilized measure the bath temperature with the thermometer and compute the tempera ture error err which is the actual bath temperature minus the set point temper ature If for example the bath is set for a lower set point of tj Z0 C and the bath reaches a measured tem
21. indhoven 5108 5692 EC Son NETHERLANDS Phone 31 402 675300 Telefax 31 402 675321 E mail ServiceDesk fluke nl Fluke Int l Corporation Service Center Instrimpex Room 2301 Sciteck Tower 22 Jianguomenwai Dajie Chao Yang District Beijing 100004 PRC CHINA Phone 86 10 6 5 12 3436 Telefax 86 10 6 5 12 3437 E mail xingye hanOfluke com cn Fluke South East Asia Pte Ltd Fluke ASEAN Regional Office Service Center 60 Alexandra Terrace 03 16 The Comtech Lobby D 118502 SINGAPORE Phone 65 6799 5588 Telefax 65 6799 5588 E mail antng singa fluke com When contacting these Service Centers for support please have the following information available e Model Number e Serial Number 1 Before You Start Authorized Service Centers e Voltage e Complete description of the problem 2 Introduction Introduction The Hart Scientific 7320 is a bench top constant temperature bath useful in temperature calibration and other applications requiring stable temperatures An innovative state of the art solid state temperature controller has been incor porated which maintains the bath temperature with extreme stability The tem perature controller uses a micro controller to execute the many operating functions User interface is provided by the 8 digit LED display and four key switches Digital remote communications is standard with an RS 232 and optional with an IEEE 488 interface The 7320 bath was designe
22. mperature does not agree with that measured by the user s reference thermometer to within the spec ified accuracy This problem may be caused by an actual difference in temperature between the points where the control probe and ther mometer probe measure temperature by erroneous bath calibration parameters or by a damaged control probe Check that the bath has an adequate amount of fluid in the tank and that the stirrer is operating properly Check that the thermometer probe and control probe are both fully inserted into the bath to minimize temperature gradient errors Check that the calibration parameters are all correct ac cording to the Report of Test If not re program the con stants The memory backup battery may be weak causing errors in data as described in the problem The display flashes cutout and an incorrect process temper ature Check that the control probe has not been struck bent or damaged If the cause of the problem remains un known contact a Hart Authorized Service Center see Section 1 3 for assistance 9 Troubleshooting Comments 9 2 9 2 1 Problem Causes and Solutions The controller shows that the out put power is steady but the pro cess temperature is unstable If the bath temperature does not achieve the expected degree of sta bility when measured using a thermometer try adjusting the propor tional band to a narrower width as discussed in Section 9 7 Proportional
23. perature of 0 3 C then the error is 0 3 C Next set the bath for the upper set point ty and after stabilizing measure the bath temperature and compute the error erry For this example we will suppose the bath was set for 100 C and the thermometer measured 100 1 C giving an error of 0 1 C Computing RO and ALPHA Before computing the new values for RO and ALPHA 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 19 User s Guide 20 6 4 The user should keep a record of these values in case they may need to be re stored in the future The new values RO and ALPHA are computed by entering the old values for RO and ALPHA the calibration temperature set points t and ty and the temperature errors err and erry into the following equations o t ny LOM 8 ALPHA vf ly I 1 ALPHA t err 1 ALPHA t err ty 8 ALPHA ALPHA If for example RO and ALPHA were previously set for 100 000 and 0 0038500 respectively and the data for ty ty errj and erry were as given above then the new values RO and ALPHA would be computed as 110 116 and 0 0038302 re spectively Program the new values RO and ALPHA into the controller Check the calibration by setting the temperature to t and tjj and measuring the errors again If desired the calibration procedure may b
24. ry does not remedy the problem there may be a failed electronic component Contact a Hart Authorized Service Center see Section 1 3 for assistance The displayed process tempera ture is in error and the controller remains in the cooling or the heating state at any set point value Possible causes may be either a faulty control probe or erroneous data in memory The probe may be disconnected burned out or shorted Check that the probe is connected properly The probe may be checked with an ohmmeter to see if it is open or shorted The probe is a platinum 4 wire Din 43760 type therefore the resistance should read 0 2 to 2 0 ohms between pins 1 and 2 on the probe con nector and 0 2 to 2 0 ohms between pins 3 and 4 The resistance should read from 100 to 300 ohms between pins 1 and 4 depending on the temperature If the probe is defective contact an Authorized Service Center for assistance If the problem is not the probe erroneous data in memory may be the cause Re initialize the memory as discussed in the problem The dis play flashes cutout and an incorrect process temperature If the problem remains the cause may be a defective electronic component contact an Authorized Service Center see Section 1 3 for assistance The controller controls or at tempts to control at an inaccurate temperature 28 The controller operates normally except when controlling at a speci fied set point At this set point the te
25. s bre Rx dave KR ee oo 20 7 Charging Instructions lt css ess 23 7 1 Leak Testine 4 5 6 arenae a ea C ei e u aa 23 7 2 EVACUALON secese oe UR OA puo d UA UC eRe es KS 23 1 3 E sg a uer i mx ae qe Be qur dieere de qo er hes nde Tende 23 8 Maintenance o o 25 8 1 General EII Om SES 25 9 Troubleshooting 5v aos now xx hm ox Sea i 27 9 1 Troubleshooting o aoa a 27 9 2 COMME s ed aie oer end bee a a uec WU deme ONE 29 9 2 1 EMC Directive s se ovea 2 4 0 8 0 u a an nn ae rA E AX PESd xS 29 9 2 2 Low Voltage Directive Safety o co as estac n 30 Figures Figure 1 Calibration Example iii Tables Table 1 International Electrical Symbols 1 Before You Start Symbols Used 1 1 Before You Start Symbols Used Table 1 lists the International Electrical Symbols Some or all of these symbols may be used on the instrument or in this manual Table 1 International Electrical Symbols Symbol Description N AC Alternating Current NL AC DC Battery AA MAN CE Complies with European Union Directives DC Double Insulated Electric Shock Fuse PE Ground Hot Surface Burn Hazard Read the User s Manual Important Information Off On OPPOIPOHO User s Guide Symbol Description Canadian Standards Association c US OVERVOLTAGE Installation CATEGORY II Pollution Degree 2 per IEC1010 1 re CATT fers to the level of Impulse With
26. s instrument will operate properly This instrument must be plugged into a 115 VAC 60Hz 230 VAC 50Hz optional AC only electric outlet The power cord of the instrument is equipped with a three pronged grounding plug for your protection against electrical shock hazards It must be plugged directly into a properly grounded three prong receptacle The receptacle must be installed in accordance with local codes and ordi nances Consult a qualified electrician DO NOT use an extension cord or adapter plug e DO use a ground fault interrupt device This unit contains a liquid A ground fault device is advised in case liquid is present in the electrical system and could cause an electrical shock 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 if 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 User s Guide The unit is equipped with a soft cutout user settable firmware and a hard cutout set at the factory Check
27. sor e This bath has been equipped with a brownout and over voltage protection device as a safety feature to protect the system components e Mode of Operation This bath needs to be plugged into the line voltage for at least 2 minutes before operation This is only necessary for the first time that the bath is energized or when it is moved from one location to another Turning the bath ON or OFF does not trigger the delay e Ifa High Low voltage condition exists for longer than 5 seconds the bath de energizes An amber indicator on the back panel lights when this con dition exists e Re energization is automatic upon correction of the fault condition and af ter a delay cycle of about 2 minutes If a fault condition exists upon appli cation of power the bath will not energize e Under and Over Voltage Protection at 115 VAC Voltage Cutout 12 5 101 129 VAC Voltage Cut In 7 5 106 124 VAC e Under and Over Voltage Protection at 230 VAC Voltage Cutout 12 5 203 257 VAC Voltage Cut In 7 5 213 247 VAC 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 User s Guide Fluke Nederland B V Customer Support Services Science Park E
28. stand Voltage protection provided Equipment of OVERVOLTAGE CATEGORY II is energy consuming equipment to be supplied from the fixed installation Examples include household office and laboratory appliances The European Waste Electrical and Electronic Equipment WEEE Directive C TIC Australian EMC Mark E 2002 96 EC mark 1 2 Safety Information Use this instrument only as specified in this manual Otherwise the protection provided by the instrument may be impaired The following definitions apply to the terms Warning and Caution Warning identifies conditions and actions that may pose hazards to the user Caution identifies conditions and actions that may damage the instru ment being used 1 2 1 A Warnings To avoid personal injury follow these guidelines GENERAL DO NOT use the instrument for any application other than calibration work The instrument was designed for temperature calibration Any other use of the 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
29. 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 Start 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 is 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 thi
30. the new set point temperature Turn off the cooling to reach and control at higher 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 for added safety See Section 9 8 Cutout To obtain optimum control stability adjust the proportional band as discussed in Section 9 7 Proportional Band 15 5 Bath Use General 5 5 1 5 2 Bath Use A CAUTION Read this section entitled BATH USE 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 needs to write their 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 fluids expand when heated and could overflow the bath if not watched Refer to General Op eration 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 gener
31. this manual a solid box around the word SET UP DOWN or EXIT indicates the panel button to press while the dotted box indicates the display reading on the front panel Explanation of the button function or display reading is written at the right 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 t Bath temperature display uununnnnnnnnuunnnunnnnnuunununnnnnn When SET is pressed the display shows the set point memory that is cur rently being used and its value Eight set point memories are available SET Access set point selection I 25 0 Set point 1 25 0 C currently used uannusunusssuanusanssssuaussa uuu RR Press SET to select this memory and access the set point value SET Access set point value t 25 00 Current value of set point 1 25 00 C ussnusuassuuuusauuanssusanusuuauuaur 4 Quick Start Setting the Temperature Press UP or DOWN to change the set point value Increment display C 30 00 New set point value Press SET to accept the new value and display the vernier value The bath be gins heating or cooling to the new set point SET Store new set point access vernier 0 00000 Current vernier value Press EXIT and the bath temperature will be displayed again exa Return to the temperature display 24 i3 C Bath temperature display The bath heats or cools until it reaches
32. ut the controller otherwise appears to operate normally increase The problem may be either insufficient heating or no heating at all or too much cooling The heater power setting being too low especially at higher operating temperatures may cause insufficient heating Switching to the higher heater power switch setting if available may solve the problem Try reducing cooling capacity by increasing the cooling temperature switching the cooling power switch to LOW or switching off the cooling altogether One or more burned out heaters or blown heater fuses may also cause this problem If the heaters seem to be burned out contact a Hart Authorized Service Center see Section 1 3 for assistance The controller display flashes The display will flash CUTOUT alternately with the process tempera cutout and the heater does not ture If the process temperature displayed seems grossly in error con operate sult the following problem The display flashes cutout and an incorrect process temperature Normally the cutout disconnects power to the heater when the bath temperature exceeds the cutout set point causing the temperature to drop back down to a safe value If the cutout mode is set to AUTO the heater switches back on when the temperature drops If the mode is set to RESET the heater only comes on again when the tempera ture is reduced and the cutout is manually reset by the operator see Section 9 8 Cutout
33. zed personnel if no other action is successful in correcting a malfunction You must have a copy of the most recent Report of Test to restore the test pa rameters DO NOT operate this instrument in an excessively wet oily dusty or dirty environment The unit is 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 is 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 compres
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