5626 5628 Users Guide 6B0901.vp
Contents
1. 11 5 1 PRI Care ES a a Se D ss Des ee 11 5 2 PRT Handling Guidelines 11 6 Operation sio uns mu se aa mes ds 13 6 1 G n ral ciao ENS wR SAS SNS RER RS 13 6 2 Comparison Calibration of Other Instruments 13 6 3 Immersion Requirements 13 6 4 ThermalEMF 14 7 Accessories 4 a 8 aR we Re ene 15 7 1 Case Options 7 2 PRT Termination 8 Troubleshooting 8 1 Troubleshooting Figures Figure 1 Figure 2 Figure 3 Figure 4 Hart Model 5626 and 5628 Platinum Resistance Thermometers Standard Dimensions PRT Schematic Probe Termination Examples iii Tables Table 1 International Electrical Symbols Table 2 Specifications 1 Before You Start 1 1 Before You Start Symbols Used Table 1 lists the International Electrical Symbols Some or all of these sym bols may be used on the instrument or in this manual Table 1 International Electrical Symbols Symbol Description NU AC Alternating Current NS AC DC Battery M MA CE Complies with European Union Directives DC Double Insulated Electric Shock Fuse PE Ground Hot Surface Burn Hazard Read the User s Manual Important Information Off On OPPOIPO 5626 5628 User s Guide Symbol Description Canadian Standards Association us OVERVO2. Hart Scientific 5626 5628 Platinum Resistance Thermometer User s Guide Rev 6B0901 Fluke Hart Scientific 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 www hartscientific com Subject to change without notice Copyright 2005 Printed in USA Rev 6B0901 Table of Contents 1 Before You Start Sw ee se De ae 1 1 1 Symbols Used ego sun dus a a dus A 1 12 Safety Information 2 1 2 1 Warnings s oee y a die edit oa dee es dinde LE 2 1 2 2 SA NE de mdr se este D 2 13 Hart Scientific Authorized Service Centers 3 2 Introduction 5 o deu sa se se ss das mn 5 2 1 General a0 ner ne ala ee dus due 5 2 2 Application 44 44 Las mue be Dan sub he 4 5 2 9 l CGANDrAUON sre sapoe pr ee Re dE AGE RER EX 6 2 4 Recalibration 6 3 Specifications and Warranty 7 3 1 Specifications 7 3 2 CONSTITUCION s 4 2 ss e ada e a ea a E iaa 8 3 3 Electrical Circuit 8 34 Warranty 24 44 24 nas 08 na 48 Aw at 8 4 Installation 2 6 sisi wehbe we eve sms 9 4 1 Environmental Issues 9 42 Mounting 4 Laine mea pes 28 Dim Rama 9 4 3 Lead Wire Identification 9 5 PRT Care and Handling Guidelines
3. spade lugs terminate the wires Application Hart 5626 and 5628 thermometers are classified as secondary standards secondary standard is defined in terms of transfer of the ITS 90 from a standards laboratory to a customer s laboratory Secondary standards are Figure 1 Hart Model 5626 and 5628 Platinum Resistance Thermometers 5626 5628 User s Guide 2 3 2 4 calibrated using a primary standard that has been calibrated in a primary calibration laboratory using known intrinsic values Calibration In order for any instrument to be used as a standard it must be calibrated The PRTs are calibrated in Hart Scientific s calibration laboratory and pro vided with a NIST traceable Report of Calibration At the time of purchase the 5626 and 5628 are calibrated over their entire range 196 C to 660 C at specified ITS 90 fixed points Generally a sec ondary PRT is calibrated by comparison method All PRTs calibrated by Hart Scientific are calibrated using standard calibration techniques Recalibration The recalibration of the 5626 5628 Secondary PRT should be scheduled ac cording to the user s company Quality Assurance requirements Normally a PRT is recalibrated annually Unless the PRT is used only over a limited range calibration over the full range of the PRT 196 C to 661 C is recom mended For information on recalibrating your 5626 or 5628 contact Hart Scientific s Customer Service department for an RMA
4. and stability of the heat source and the degree of accuracy required determine the number of temperature measurements necessary However to follow good practice procedures always measure the triple point of water R after each temperature measurement The following equation provides 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 error 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 im mersed 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 addi tion heat losses occur due to radiation losses from the sensing element to the housing The immersion depth for standards is dependent on several factors includ ing accuracy requirements and type of liquid Therefore we recommend a 152 mm 6 inches minimum immersion depth However remember the handle limitations The handle is not designed to be immersed The temper ature limits of the handle are 0 C to 80 C Temperatures outside these limits can damage the handle Convection of heat from the heat source must be kept within the handle limits The exact immersion depth req
5. 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 call ing or writing an Authorized Hart Scientific Service Center see Section 1 3 on page 3 for authorization The Service Center assumes NO risk for in transit damage THE FOREGOING WARRANTY IS PURCHASER S SOLE AND EXCLUSIVE REM EDY AND IS IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OR MERCHANT ABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE OR USE HART SHALL NOT BE LIABLE FOR ANY SPECIAL INDIRECT INCIDENTAL OR CONSE QUENTIAL DAMAGES OR LOSS WHETHER IN CONTRACT TORT OR OTHERWISE 4 Installation 4 2 4 3 Installation Environmental Issues Ideally temperature calibration equipment should be used in a calibration laboratory or other facility specifically designed for this purpose Environ mental requirements include e Stable temperature and relative humidity lt 80 e Clean draft free area e Low noise level low radio frequency magnetic or electrical interfer ence e Low vibration levels Mounting Most often temperature standards primary and secondary are used to cali brate other temperature sensitive equipment The PRT must be mounted carefully to avoid any damage to the sheath or sen
6. LTAGE Installation CATEGORY II Pollution Degree 2 per CATI IEC1010 1 refers to the level of Impulse Withstand Voltage protection provided Equipment of OVERVOLTAGE CATEGORY II is energy con suming equipment to be supplied from the fixed installation Exam ples include household office and laboratory appliances The European Waste Electrical and Electronic Equipment WEEE Di rective 2002 96 EC mark C TIC Australian EMC Mark ue 1 2 Safety Information Use this instrument only as specified in this manual Otherwise the protec tion 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 instrument being used 1 2 1 A Warnings To avoid personal injury follow these guidelines DO NOT use this instrument to measure the temperature of any haz ardous live component DO NOT use this unit for any application other than calibration work DO NOT use this unit in environments other than those listed in the user s manual Use of this instrument at high temperatures for extended periods of time can cause the handle to become hot Follow all safety guidelines listed in the user s manual Calibration Equipment should only be used by Trained Personnel 1 2 2 A Cautions To avoid possible damage t
7. N 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 follow ing information available e Model Number e Serial Number e Complete description of the problem 2 Introduction 2 2 Introduction General The Hart Platinum Resistance Thermometers PRT models 5626 and 5628 are designed to be the best secondary standard interpolating instrument converting temperature to resistance The PRTs are used with a readout de vice to detect temperature changes or actual temperature The PRTs cover the International Temperature Scale of 1990 ITS 90 range from 200 C to 661 C Two standard resistance values are available The 5626 is 1000 and the 5628 is 25 50 Standard lengths are 12 15 and 20 inches Custom lengths are available on request The two PRTs are hand constructed at Hart Scientific by experts with years of PRT manufacturing experience Each PRT is carefully annealed at the ap propriate temperatures and precisely tested for stability The sensing ele ment is fabricated using high purity platinum wire wound in a strain free design on a specially designed support The 1 4 inch O D Inconel 600 sheaths are sealed with a specially mixed gas and fit with a terminal box handle and strain relieved connection to the four wire cable Gold plated
8. e sensor at high temperature have been eliminated However care should still be used when handling the PRT even though the Inconel sheath is durable and provides good protection for the sensor 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 Note The PRT sheath changes color after use at high temperatures The PRT may arrive with a brown tint to the sheath due to calibration at high temperatures The handle is not designed to be immersed The temperature limits of the handle are 0 C to 80 C Temperatures outside these limits can damage the sealed portion of the handle and the connectors PRT Handling Guidelines e DO anneal the thermometer after shipment Shipping the thermometer can cause mechanical shocks that effect the accuracy of the thermome ter Therefore if possible we advise that the thermometer be annealed before use The thermometer should be annealed at 500 C overnight or 660 C for four 4 hours e DO keep the thermometer as clean as possible Always remove any fluid from the sheath immediately after taking the thermometer from a bath e DO immerse the thermometer in the appropriate liquid for the temper ature 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 effec
9. erature errors 0 1 C less than 0 1 C If this is observed first measure and re cord the R Next anneal the PRT at 660 C overnight Measure the R again The annealing should decrease the R Repeat the annealing R measurement cycle several times When the R is stable recalibrate the PRT If the R does not stabilize contact an Authorized Hart Scientific Service Center see Section 1 3 e Oxidation of the platinum sensor may occur after pro longed use between 200 450 C This oxidation will demonstrate itself by an increase in R of less than 0 1 C To reduce the effects of oxidation anneal the PRT at 600 661 C overnight 12 hr Measure the R again Repeat the annealing R measurement cycle several times This annealing process should return R to within calibration tolerances If the R is within calibration tol erance the PRT is usable If the R is not within calibra tion tolerance but it is stable recalibrate the PRT Data unstable e Ifthe data is unstable at the Triple Point of Water TPW check the connector If the connector is correct contact an Authorized Hart Scientific Service Center see Section 1 3 The PRT may be damaged and need repair e If the data is unstable at high temperatures it may be due to electrical noise in the system Reduce the temper ature and observe the data If it is stable electrical noise is interfering with the measurements at high tempera tures Check the ground
10. h 25 Terminal Box Lead Wire Gold plated Terminals 2 meters n 6 Sk Figure 2 Standard Dimensions 5626 5628 User s Guide 3 2 3 3 3 4 Construction The Model 5626 and 5628 PRTs cover the range from 200 C to 661 C The sensor elements are crafted using high purity platinum wire wound in a strain free design on a specially designed support Electrical Circuit The PRTs are 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 Warranty Hart Scientific Inc 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 war ranty 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 in structions 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
11. ing of the readout device and the heat source A faulty ground on either device could interfere with high temperature measurements A ground wire attached to the metal sheath of the PRT may help to reduce electrical noise interference 17 5626 5628 User s Guide 18 Problem Causes and Solutions Temperature readout differ ent than expected e g the heat source is set at 300 C the PRT measures 275 C Measure the PRT resistance at TPW Tf the resistance of the PRT is less than the rated resis tance e g 70 Q for the 5626 there may be a short in the sensor Contact an Authorized Hart Scientific Service Center see Section 1 3 If the resistance of the PRT is only a few ohms there may be a short in the four lead wires Contact an Autho rized Hart Scientific Service Center see Section 1 3 If the PRT is open the resistance will be Out of Limits or in the kilo ohm or mega ohm range Contact an Au thorized Hart Scientific Service Center see Section 1 3
12. nd 5628 12 PRT e Model Number 2609 PRT Protective Case for 5626 15 5628 15 5626 20 and 5628 20 PRT 7 2 PRT Termination The 5626 5628 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 E a Bare Wire customer option 5 Pin DIN customer option Figure 4 Probe Termination Examples 15 8 Troubleshooting 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 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 con tact an Authorized Hart Scientific Service Center see Section 1 3 for assis tance Be sure to have the model number and serial number of your probe available Problem Causes and Solutions Data changes greater than Mechanical shock can cause temperature errors as great 0 1 C are observed as 0 5 C If this is observed first measure and record the R Next anneal the PRT at 660 C overnight Measure the R again The annealing should decrease the R If the R is stable recalibrate the PRT Data changes less than e Slight mechanical shock can cause temp
13. number and current pricing see Section Before You Start Depending on the user s Quality Assurance requirements the PRT drift should be checked periodically at the Triple Point of Water TPW Section 8 Troubleshooting provides information on drift with respect to mechanical shock and oxidation If the R cannot be restored after annealing to within calibration tolerances a full recalibration should be scheduled 3 Specifications and Warranty Specifications and Warranty Specifications See Table 2 and Figure 2 Table 2 Specifications 5626 5628 Temperature Range 200 C to 661 C Re 100Q 1Q at 0 01 C 25 5Q 0 5Q at 0 01 C Resistance RatioW Ga W 302 9146K gt 1 11807 o gt 0 003925 Calibration Uncertainty 0 006 C at 200 C k 2 0 004 C at O C 0 009 C at 420 C 0 014 C at 661 C Short Term Stability 0 003 C 0 002 C Long Term Drift R lt 0 03 C with 500 hours at lt 0 02 C with 500 hours at 661 C 661 C Sheath Inconel 600 Handle Temperature 0 C to 80 C Range Lead Wires 4 wire Super Flex PVC 22 AWG Termination Gold plated spade lugs Size 304 8 mm x 6 35 mm dia 12 Lx 0 25 381 mm x 6 35 mm dia 15 L x 0 25 508 mm x 6 35 mm dia 20 L x 0 25 562X 12 12 65 mm o gt lt ___ 562X 15 15 2 5 562X 20 20 MEERN 5626 SN 0021 ee Y o 6 35 mm Strain Relief lt Inconel Sheat
14. o the instrument follow these guidelines e DO NOT remove the label from the handle This cautions the user con cerning the delicate nature of the instrument 1 Before You Start 1 3 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 5 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 In correct packaging of the PRT for shipment can cause irreparable dam age Hart Scientific Authorized Service Centers Please contact one of the following authorized Service Centers to coordinate service on your Hart product Hart Scientific Inc 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 5626 5628 User s Guide Phone 86 10 6 512 3436 Telefax 86 10 6 512 3437 E mail xingye han fluke com cn Fluke South East Asia Pte Ltd Fluke ASEA
15. sor 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 comparison block However allow for the ther mal expansion of the thermometer sheath when determining block well tolerances Lead Wire Identification The 5626 and 5628 PRTs are equipped with a four wire cable The same circuit schematic applies to both PRTs see Figure 3 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 5 PRT Care and Handling Guidelines 5 5 1 5 2 PRT Care and Handling Guidelines PRT Care A CAUTION READ THIS SECTION BEFORE REMOVING THE PRT FROM THE SHIPPING BOX OR CASE The 5626 and 5628 Platinum Resistance Thermometers PRTs are delicate instruments Care must be taken in handling the PRTs to maintain calibra tion accuracy The stress free design of the PRT sensor reduces the effects of mechanical shock In addition contamination problems of th
16. t the temperature error caused by the conduction of heat away from the sensor Do not submerge the handles 5626 5628 User s Guide 12 DO allow sufficient time for the thermometer to stabilize before making measurements This allows for the best accuracy 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 12 hours if it becomes oxidized DO use the protective shipping box or case provided or other protec tion when the thermometer is not in use DO NOT subject the thermometer to any physical shock or vibration DO NOT use pliers or other devices to squeeze the sheath This action can permanently damage the PRT DO NOT subject the thermometer to temperatures above the highest specified operating temperature DO NOT expose the thermometer s handle or cables to extreme tem peratures The temperature limits of the handle are 0 C to 80 C DO NOT submerge the handle or cable in liquids DO NOT screw a clamp down so tight that it dents the sheath This can permanently damage the PRT 6 Operation 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
17. uired can be determined by performing a gradient 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 13 5626 5628 User s Guide 14 6 4 Thermal EMF Two factors contribute to thermal EMF chemical consistency and physical consistency Variations in chemical structure due to impurities can contrib ute 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 EMP is caused by a difference in temperature 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 substantial 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 canceled by using an AC bridge or a DC bridge with re versible current 7 Accessories 7 Accessories 7 1 Case Options The 5626 5628 PRT comes in a rigid case appropriate for the length of the probe e Model Number 2601 PRT Protective Case for 5626 12 a
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