5624 Users Guide 6B0902.vp
Contents
1.2. Hart Scientific 9 5624 Platinum Resistance Thermometer User s Guide Rev 6B0902 Fluke Corporation Hart Scientific Division 799 E Utah Valley Drive e American Fork UT 84003 9775 USA Phone 1 801 763 1600 Telefax 1 801 763 1010 E mail support hartscientific com www hartscientific com Subject to change without notice Copyright 2005 Printed in USA Rev 6B0902 Table of Contents 1 Before You Start l 1 1 Symbols Used se cs o m m eR 1 1 2 Safety Information o e ss soe eoc eae anea tr RR reis 2 1 21 WARNINGS 6 08 manea on Bae A ees dne ud eid Se ae T 2 1 2 2 CAUTIONS a dice da ica uh m eid de Quake a ep eck a 2 1 3 Verifying Probe Accuracy a 3 1 4 Authorized Service Centers llle 4 2 Introduction 7 2 1 General ioir c gue ra Re bk eae 7 2 2 Application 99 OP Yo X 9 voy y dee we See 7 2 3 Calibration 22s 8 2 4 Recdibration ee 8 3 Specifications and Warranty 9 3 1 Specifications 24 44 00 5460 Cae eee o9 m o m m ee ee 9 3 2 Construction uu 44 0 eck s bow gees cm ae ore ck ee a eR es 9 3 3 Electrical CircUlt s os e644 ee ee 33x x 9 34 Warranty p ke ew Re A Ga a ee oO Be 4 YES 10 4 Installation 13 4 1 Environmental Issues 13 4 2 Mountng 2 5284 e bd eb m Rom hoe Eee Oe ee Ges 13 4 3 Lead Wire Identification o
3. furnace e For sheath longevity insert the PRT at 500 C and ramp to higher temper atures e DO immerse the thermometer in the appropriate liquid for the tempera ture range If a dry block is used the well diameter should allow the PRT to comfortably slip in and out without excess movement For best results immerse the thermometer as deep as possible to avoid stem effect the temperature error caused by the conduction of heat away from the sen sor Do not submerge the handle DO allow sufficient time for the thermometer to stabilize before making measurements This allows for the best accuracy 15 5624 Platinum Resistance Thermometer User s Guide 16 DO use the correct drive current with the thermometer to prevent error in temperature or resistance Hart Scientific recommends 1mA DO anneal the thermometer at 600 to 661 C for 4 hours if it becomes oxi dized DO use the protective shipping box or case provided or other protection when the thermometer is not in use DON T subject the thermometer to any physical shock or vibration DON T use pliers or other devices to squeeze the sheath This action can permanently damage the PRT DON T subject the thermometer to temperatures above the highest speci fied operating temperature DON T expose the thermometer s handle or cables to extreme tempera tures The temperature limits of the handle are 20 C to 200 C DON T submerge the handle or cable
4. in liquids DON T screw a clamp down so tight that it breaks or cracks the sheath This can permanently damage the PRT 6 Operation General 6 1 6 2 6 3 Operation General For best results be familiar with the operation of the heat source and the read out instrument Be sure to follow the manufacturer s instructions for the read out instrument and the heat source Comparison Calibration of Other Instruments The uniformity and stability of the heat source and the degree of accuracy re quired determine the number of temperature measurements necessary How ever to follow good practice procedures always measure the triple point of water R after each temperature measurement The following equation pro vides the most accurate measurement of the ratio All PRTs experience errors caused by self heating of the element Self heating is a combination of two factors heat dissipation and heat sink Self heating er ror can be reduced to have a negligible effect if the PRT is used with the same excitation current and medium in which it was calibrated immersion Requirements Stem effect can cause measurement errors for any thermometer not immersed in the fluid at least 152 mm 6 inches This error is due to heat lost or gained by the sensing element through the thermometer stem In addition heat losses occur due to radiation losses from the sensing element to the housing The immersion depth for standards is dep
5. ation as can sometimes occur from mechanical shock during shipping for example To verify your probe check the probe at the triple point of water 0 01 C or in a well constructed ice bath by following these steps 1 Connect the probe to a calibrated readout and verify that the probe s co efficients have been correctly entered into the readout 2 Properly prepare a triple point of water cell TPW or ice bath Contact Hart Customer Service if unsure how to do this A triple of water cell is preferred Ice baths should use distilled water and crushed ice in a Dewar flask or thermos bottle The ratio of ice to water should be such that the mixture is firm after prepared 3 Set your readout to read in ohms rather than temperature Place your probe in the TPW or ice bath and allow it to stabilize Remember a TPW is at 0 01 C and an ice bath is at 0 C 4 If using a TPW cell compare the resistance value on your readout with the resistance value at TPW given on the probe s certificate If using an ice bath compare the resistance value on your readout with the resis tance indicated on the certificate for 0 C You may have to use the probe s temperature versus resistance table and interpolate to get the probe s calibrated resistance value at 0 C 5 Considering the probe s uncertainty specification determine whether or not it is within tolerance of the data on its most recent certificate of cali bration If it is it ma
6. ck In addition contamination problems of the sensor at high temperature have been eliminated However care should still be used when handling the PRT even though the Alumina sheath is durable and provides good protection for the sen sor Correct handling of the PRT will prolong the life expectancy When not in use the PRT should be stored in the protective case provided by Hart The handle is not designed to be immersed The temperature limits of the han dle are 20C to 200 C Temperatures outside these limits can damage the sealed portion of the handle and the connectors PRT Handling Guidelines e Ideally DO NOT remove the probe directly to room temperature above 600 C Slowly cool the PRT roughly at 150 C hour above 600 C before removing to room temperature The PRT can be safely removed from an instrument at 600 C or less and cooled to room temperature without con cern for the cooling rate If the PRT is removed from instrument above 600 C place the PRT in an annealing furnace for one hour e DO anneal the thermometer after shipment Shipping the thermometer can cause mechanical shocks that effect the accuracy of the thermometer Therefore if possible we advise that the thermometer be annealed before use The thermometer should be annealed at 965 C for four 4 hours e DO keep the thermometer as clean as possible Always remove any fluid or other debris from the sheath immediately after taking the thermometer from a bath or
7. e lugs terminate the wires Application Hart 5624 thermometer is classified as a secondary standard A secondary stan dard is defined in terms of transfer of the ITS 90 from a standards laboratory to a customer s laboratory Secondary standards are calibrated using a primary standard that has been calibrated in a primary calibration laboratory using known intrinsic values it i o E ES m pn Figure 1 Hart Model 5624 Platinum Resistance Thermometers 5624 Platinum Resistance Thermometer User s Guide 2 3 2 4 Calibration In order for any instrument to be used as a standard it must be calibrated Each PRT is calibrated in Hart Scientific s calibration laboratory and provided with a NIST traceable Report of Calibration At the time of purchase the 5624 is calibrated from the Triple Point of Water to the Silver Point 0 1 C to 961 78 C at specified ITS 90 fixed points Gener ally a secondary PRT is calibrated by comparison method All PRTs calibrated by Hart Scientific are calibrated using standard calibration techniques Recalibration The recalibration of the 5624 Secondary PRT should be scheduled according to the user s company Quality Assurance QA requirements Normally a PRT is recalibrated recalibrated at least annually A shorter calibration cycle can be re quired to meet QA requirements Unless the PRT is used only over a limited range calibration over the full range of the PRT 0 1 C
8. endent on several factors including accuracy requirements and type of liquid Therefore we recommend a 152 mm 6 inches minimum immersion depth at 700 C However remember the handle limitations The handle is not designed to be immersed The temperature limits of the handle are 20 C to 200 C Temperatures outside these limits can dam age the handle Convection of heat from the heat source must be kept within the handle limits The exact immersion depth required can be determined by performing a gradi ent test taking measurements approximately every 1 27 cm 5 inches until there is a significant difference in readings Allow the thermometer to stabilize at each new depth Plot the results to see the stem effect 17 5624 Platinum Resistance Thermometer User s Guide 18 6 4 Thermal EMF Two factors contribute to thermal EMF chemical consistency and physical con sistency Variations in chemical structure due to impurities can contribute to thermal EMF Also discrepancies in crystal structure can contribute to thermal EMF These factors are minimized by annealing the full length of wire before construction of the PRT Likewise connection to extension lead wires and readout instruments can be a source of thermal EMF The thermal EMF is caused by a difference in tempera ture between two connections If the two connections are the same temperature there will be little or no thermal EMF effects However if there is a substan
9. ges greater than 0 1 C are observed Mechanical shock can cause temperature errors as great as 0 5 C If this is observed first measure and record the R Next anneal the PRT at 965 C for four hours Measure the R again The annealing should decrease the R If the R is stable recalibrate the PRT Data changes less than 0 1 C Slight mechanical shock can cause temperature errors less than 0 1 C If this is observed first measure and record the Pro Next an neal the PRT at 965 C for four hours Measure the R again The an nealing should decrease the Rip Repeat the annealing R measurement cycle several times When the R is stable recalibrate the PRT If the R does not stabilize contact a Hart Scientific Autho rized Service Center see Section 1 4 Oxidation of the platinum sensor may occur after prolonged use be tween 200 450 C This oxidation will demonstrate itself by an in crease in R of less than 0 1 C To reduce the effects of oxidation anneal the PRT at 600 661 C for 4 hours Measure the R again Repeat the annealing R measurement cycle several times This an nealing process should return R to within calibration tolerances If the R is within calibration tolerance the PRT is usable If the R is not within calibration tolerance but it is stable recalibrate the PRT Data unstable If the data is unstable at the Triple Point of Water TPW check the connector If the connector is correc
10. hat the defect or malfunction has been caused by misuse alteration abuse or abnormal condi tions or operation or handling Hart will repair the product and bill the pur chaser for the reasonable cost of repair To exercise this warranty the purchaser must forward the product after calling or writing Hart for authorization Hart assumes NO risk for in transit damage For service or assistance please contact an Authorized Service Center see Sec tion 1 4 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 3 Specifications and Warranty Warranty ANY SPECIAL INDIRECT INCIDENTAL OR CONSEQUENTIAL DAM AGES OR LOSS WHETHER IN CONTRACT TORT OR OTHERWISE 11 4 Installation Environmental Issues 4 1 4 2 4 3 Installation Environmental Issues Ideally temperature calibration equipment should be used in a calibration labo ratory or other facility specifically designed for this purpose Environmental re quirements include e Stable temperature and relative humidity lt 80 e Clean draft free area e Low noise level low radio frequency magnetic or electrical interference e Low vibration levels e Indoor use only Mounting Most often temperature standards primary and secondary are u
11. he User s Manual Important Information Off On OPPOUPH 5624 Platinum Resistance Thermometer User s Guide Symbol Description Canadian Standards Association Us OVERVOLTAGE Installation CATEGORY II Pollution Degree 2 per IEC1010 1 re CATI fers to the level of Impulse Withstand Voltage protection provided Equipment of OVERVOLTAGE CATEGORY II is energy consuming equipment to be supplied from the fixed installation Examples include household office and laboratory appliances C TIC Australian EMC Mark Y The European Waste Electrical and Electronic Equipment WEEE Directive 2002 96 EC mark mum 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 personal injury follow these guidelines e DO NOT use this instrument to measure the temperature of any hazardous live component e DO NOT use this unit for any application other than calibration work e DO NOT use this unit in environments other than those listed in the user s manual e Use of this instrument at high temperatures for extended periods of time can cause the handle to become hot e Fol
12. low all safety guidelines listed in the user s manual e Calibration Equipment should only be used by Trained Personnel 1 2 2 A CAUTIONS To avoid possible damage to the instrument follow these guidelines e Ideally DO NOT remove the probe directly to room temperature above 600 C Slowly cool the PRT roughly at 150 C hour above 600 C before removing to room temperature The PRT can be safely removed from an instrument at 600 C or less and cooled to room temperature without con 1 Before You Start Verifying Probe Accuracy 1 3 cern for the cooling rate If the PRT is removed from instrument above 600 C place the PRT in an annealing furnace for one hour e For sheath longevity insert the PRT at 500 C and ramp to higher temper atures e DO NOT remove the label from the handle This cautions the user con cerning the delicate nature of the instrument e DO NOT drop or bang the probe in any way This will cause damage to the probe internally and affect its calibration e Read Section entitled PRT Care and Handling Guidelines before re moving the PRT from the shipping box or case Incorrect handling can damage the PRT and void the warranty e Keep the shipping container in case it is necessary to ship the PRT Incor rect packaging of the PRT for shipment can cause irreparable damage Verifying Probe Accuracy Before using your probe verify that its behavior has not changed significantly from the most recent calibr
13. n Fluke South East Asia Pte Ltd Fluke ASEAN Regional Office Service Center 60 Alexandra Terrace 03 16 The Comtech Lobby D 118502 SINGAPORE Phone 65 6799 5588 Telefax 65 6799 5588 E mail antngOsinga fluke com When contacting these Service Centers for support please have the following information available e Model Number e Serial Number e Complete description of the problem 2 Introduction General 2 1 2 2 Introduction General The Hart Platinum Resistance Thermometer PRT model 5624 is designed to be the best secondary standard interpolating instrument converting temperature to resistance up to 1000 C The PRT is used with a readout device to detect temperature changes or actual temperature The PRT covers the International Temperature Scale of 1990 ITS 90 range from 0 C to 1000 C The standard resistance value is 10 ohms The standard length is 20 inches Custom lengths are available on request The PRT is hand constructed at Hart Scientific by experts with years of PRT manufacturing experience Each PRT is carefully annealed at the appropriate temperatures and precisely tested for stability The sensing element is fabri cated using high purity platinum wire wound in a strain free design on a spe cially designed support The 1 4 inch O D Alumina sheath is sealed with a specially mixed gas and fit with a terminal box handle and strain relieved con nection to the four wire cable Gold plated spad
14. port See Figure 2 on page 10 for description and dimensions Electrical Circuit The PRT is provided with a terminal box handle The two meter cable has four Super Flex wires enclosed in a PVC jacket with a stainless steel spring strain relief Gold plated spade lugs terminate the wires 5624 Platinum Resistance Thermometer User s Guide 508 mm 20 gt 65 mm z FLUKE Hart Scientific 5624 SN 1234 x ES 6 35 mm N Alumina Sheath 25 Terminal Box Gold plated Terminals m 2 meters f 6 iN i ho 52 te mm Figure 2 Standard Dimensions 3 4 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 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 determined upon examination by Hart to be defective If Hart determines t
15. s s ed erang matara deda 13 5 PRT Care and Handling Guidelines 15 54 PRI Cafe cenas A Sab AA e 15 5 2 PRT Handling Guidelines o oo o 15 6 ADperalll 934 0X9 XY e 909 9 OO Ux oo os AZ 6 1 General a x3 moe se ceo mU ROG S OE MOS RO ER Rn mS EUR 17 6 2 Comparison Calibration of Other Instruments 17 6 3 Immersion Requirements llle 17 64 ThemalEMEF soci ss kem RR RR URS 18 7 Accessories cusco a as as wok 1D 7 1 Case Options sr Kiev ae See eee ee OS EE a 19 7 2 PRI Termination 4 uoo eee ovo vo bea o o o eS 19 8 Troubleshooting 21 8 1 Troubleshooting ccoo sek R Rx 21 Figures and Tables Table 1 Figure 1 Figure 2 Figure 3 Figure 4 International Electrical Symbols sns 1 Hart Model 5624 Platinum Resistance Thermometers 7 Standard Dimensions 10 PRT Schematic ee 13 Probe Termination Examples 00 0 19 lii 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 INJ AC Alternating Current v AC DC Battery Mm MA CE Complies with European Union Directives DC Double Insulated Electric Shock Fuse PE Ground Hot Surface Burn Hazard Read t
16. sed to calibrate other temperature sensitive equipment The PRT must be mounted carefully to avoid any damage to the sheath or sensor If the fluid bath used does not have a lid designed for PRT insertion clamps should be used to ensure the handle and cable are not immersed Do not screw the clamps too tight Over tightening will damage the sheath If metal comparison blocks are used in the bath maintain a close fit between the thermometer sheath and the well in the com parison block However allow for the thermal expansion of the thermometer sheath when determining block well tolerances Lead Wire Identification The 5624 PRT is equipped with a four wire cable Four lead wires are used to cancel lead wire resistance For best results the readout device should be equipped to handle four terminal resistors RED Heat Shrink BLACK Heat Shrink Figure 3 PRT Schematic The lead wires are four different colors Lead wire pairs attached to each end of the sensor are identified by red and black heat shrink tubing 13 5 PRT Care and Handling Guidelines PRT Care 5 1 5 2 PRT Care and Handling Guidelines PRT Care CAUTION READ THIS SECTION BEFORE REMOVING THE PRT FROM THE SHIPPING BOX OR CASE The 5624 Platinum Resistance Thermometer PRT is a delicate instrument Care must be taken in handling the PRT to maintain calibration accuracy The stress free design of the PRT sensor reduces the effects of mechanical sho
17. t contact a Hart Scientific Autho rized Service Center see Section 1 4 The PRT may be damaged and need repair If the data is unstable at high temperatures it may be due to electrical noise in the system Reduce the temperature and observe the data If itis stable electrical noise is interfering with the measurements at high temperatures Check the grounding of the readout device and the heat source A faulty ground on either device could interfere with high temperature measurements Use of a clamp on ferrite on both ends of the lead wire may reduce noise interferance If the data remains un stable at high temperatures determine the source of the interferance and resolve the issue 21 5624 Platinum Resistance Thermometer User s Guide Problem Causes and Solutions Temperature readout different than expected e g the heat source is set at 300 C the PRT measures 275 C Measure the PRT resistance at TPW If the resistance of the PRT is less than the rated resistance e g 7Q for the 5624 there may be a short in the sensor Contact an Autho rized Service Center see Section 1 4 If the resistance of the PRT is only 1 or 2 ohms there may be a short in the four lead wires Contact a Hart Scientific Authorized Service Center see Section 1 4 If the PRT is open the resistance will be Out of Limits or in the kilo ohm or mega ohm range Contact an Authorized Service Center see Section 1 4 22
18. tial temperature difference between connections the thermal EMF effects will be significant Therefore cover or insulate any exposed bridge or galvanometer terminals to lessen the source of error The effects of thermal EMF can be can celed by using an AC bridge or a DC bridge with reversible current 7 Accessories Case Options 7 Accessories 7 1 Case Options The 5624 PRT comes in a rigid case appropriate for the length of the probe e Model 2609 PRT Protective Case 7 2 PRT Termination The 5624 PRT can be terminated in three ways Figure 4 depending on the user s requirements e Gold Plated Spade Lug e Bare Wire e 5 Pin Din Connector Spade Lug standard pr Bare Wire customer option 5 Pin DIN customer option Figure 4 Probe Termination Examples 19 8 Troubleshooting Troubleshooting 8 1 Troubleshooting Troubleshooting In the event that the probe appears to function abnormally this section may be of use in solving the problem Several possible problem conditions are de scribed 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 a Hart Scientific Authorized Service Center see Section 1 4 Be sure to have the model number and serial number of your probe available Problem Causes and Solutions Data chan
19. to 961 78 C is recom mended For information on recalibrating your 5624 contact your Hart Scien tific Authorized Service Center see Section 1 4 Depending on the user s Quality Assurance requirements the PRT drift should be checked periodically at the Triple Point of Water TPW Section 8 Trouble shooting provides information on drift with respect to mechanical shock and oxidation If the R cannot be restored after annealing to within calibration tol erances a full recalibration should be scheduled 3 Specifications and Warranty Specifications 3 Specifications and Warranty 3 1 Specifications Range 0 C to 1000 C Long Term Drift Rtpw lt 0 01 C at 1000 C for 100 hours lt 0 06 C at 1000 C for 1000 hours Stability 0 005 C Immersion lt 6 inches 152 4 mm at 700 C Rtpw 100 0 1Q Maximum Handle 200 C Temperature Calibration 1913 6 to include Ag freeze point Calibration Uncertainty 0 05 C at 961 C Hysterisis lt 0 005 C from 0 C to 1000 C Thermocycling 1000 C lt 0 01 C 10 cycles fro 0 C to 1000 C Current 1mA Mechanical NN Size 0 D 1 4 inch 6 35 mm Sheath Material Alumina Length 20 inches 508 mm Sensor Length 25 mm Capsule Length 30 mm 3 2 Construction 3 3 The 5624 PRT covers the range from 0 C to 1000 C The sensor elements are crafted using high purity platinum wire wound in a strain free design on a spe cially designed sup
20. y be placed in service If not double check the probe coefficients in the readout If they are correct contact Hart Cus tomer Service 5624 Platinum Resistance Thermometer User s Guide Hart recommends that a probe be periodically checked against a standard such as a triple point of water cell or well constructed ice bath if an ITS 90 fixed point standard is not available The verification interval depends on how the probe is handled how and how much it is used and your documented expe rience with it Your probe should also be checked any time you suspect it may have received mechanical shock or whenever its accuracy appears suspect 1 4 Authorized Service Centers Please contact one of the following authorized Service Centers to coordinate service on your Hart product Fluke Corporation Hart Scientific Division 799 E Utah Valley Drive American Fork UT 84003 9775 USA Phone 1 801 763 1600 Telefax 1 801 763 1010 E mail support hartscientific com Fluke Nederland B V Customer Support Services Science Park Eindhoven 5108 5692 EC Son NETHERLANDS Phone 31 402 675300 Telefax 31 402 675321 E mail ServiceDesk fluke nl 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 1 Before You Start Authorized Service Centers Telefax 86 10 6 512 3437 E mail xingye han fluke com c
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