5680 5682 5699 User`s Guide R
Contents
1. ART SCIENTIFIC A Fluke Company 5680 5682 5699 Metal Sheath Standard Platinum Resistance Thermometer User s Guide Rev 492702 Copyright 0 1996 2000 All rights reserved Hart Scientific 799 E Utah Valley Drive American Fork Utah 84003 9775 Telephone 801 763 1600 Fax 801 763 1010 Internet http www hartscientific com Rev 492702 Table of Contents 1 Before You Start sg sc ss sos ee ee ew we ee 1 1 1 Symbols Used a sma mac ra a Da ee A 1 1 2 Safety Informati0D 2 1 2 1 Wamings Li a a e Aaa a a 2 1 2 2 SA A A a Gee eet AA 2 13 Hart Scientific Authorized Service Centers 3 2 Introduction 5 o lt lt 0 054555202 5 2 1 General ams sms RL eee o E 5 22 Application ssa ss tas asda da ia bee he es 6 2 3 Calibrations sa aan eek oe Bw Ba E A A UB 6 2 3 1 Calibration Intervals o e 6 24 Recalibration poba do a ii 6 2 5 Return Procedure dorade mai 6 3 Specifications and Warranty 9 3 1 Specifications gt a gt e sri ska e 00 02 0048 9 3 2 CONSHUCUION s s s soe oe E A Bs wo N 9 3 3 Electrical Circuit 9 34 Waranty x ss sm mos a eee A A Bian ee 10 4 Installation oo ss sms saca aaa ee a 11 41 Environmental Issues a 11 42 Mounting lt 2 34 086 Gee ea pan ed be E 11 4 3 Lead Wire Identification2. 11 5 SPRT Care and Handling Guidelines 13 5 1 SPRT Care ca so c iocs es 13 5 2 SPRT Handling Guidelines 13 O Operation s sad mata a O A E 15 6 1 General s oee Boe poa Da aan Be A mn E 15 6 2 Comparison Calibration of Other Instruments 15 6 3 Immersion Requirements 15 6 4 Thermal EME gas aaa a we ia mena 15 6 5 Measuring Current Lo 6 6 Cooling Rates at High Temperatures 2 BCCESSONES ass Hood kon o muka E a 11 CASO sa auge E ado AS A O ee eR q 8 Troubleshooting a soas 8 1 Troubleshooting e atkarpa Figures and Tables Table 1 Figure 1 Table 2 Figure 2 International Electrical Symbols o 5680 5682 5699 Metal Sheath Platinum Resistance Thermometer specifications acord h ea a de e DE e eee Circuit Schematic a a eee ee es iii 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 Ne AC Alternating Current As AC DC Battery Mm MN O gt l ei 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 56
3. Cen ter Data unstable If the data is unstable at the Triple Point of Water TPW check the connection first If this action does not fix the problem contact a Hart Scientific Authorized Service Center The SPRT 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 tem perature and observe the data If it is stable electrical noise is interfering with the measurements at high tem peratures Check the grounding of the readout device and the heat source A faulty ground on either device could interfere with high temperature measurements A ground lead wire the fifth wire of the SPRT may help to reduce electrical noise interference Be sure the ground lead wire is connected to an appropriate ground on the read out device 21 5680 5682 5699 SPRT User s Guide 22 Problem Solution Temperature readout differ ent than expected e g the heat source is set at 300 C the SPRT measures 275 C Measure the SPRT resistance at TPW e If the resistance of the SPRT is less than the rated resis tance there may be ashort in the sensor Contact a Hart Scientific Authorized Service Center e If the resistance of the SPRT is only a few ohms there may be a short in the four lead wires Contact a Hart Scientific Authorized Service Center e If the SPRT is open the resistance will be Out of Limits or in the kilo ohm or mega ohm r
4. To avoid possible damage to 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 Read Section entitled SPRT Care and Handling Guidelines before re moving the SPRT from the shipping box or case Incorrect handling can damage the SPRT and void the warranty e Keep the shipping container in case it is necessary to ship the SPRT Incorrect packaging of the SPRT for shipment can cause irreparable damage 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 Phone 86 10 6 512 3436 5680 5682 5699 SPRT User s Guide Telefax 86 10 6 512 3437 E mail xingye han fluke com cn Fluke South East Asia Pte Ltd Fluke ASEAN Regional Office Service Center 83 Clemenceau Avenue 15 15 06 Ue Square 239920 S
5. 80 5682 5699 SPRT User s Guide Symbol Description amp Canadian Standards Association us OVERVOLTAGE Installation CATEGORY II Pollution Degree 2 per CATI IEC1010 1 refers to the level of Impulse Withstand Voltage protection provided Equipment of OVERVOLTAGE CATEGORY Il is energy con suming equipment to be supplied from the fixed installation Exam ples include household office and laboratory appliances C TIC Australian EMC Mark 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 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 haz ardous 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 Follow all safety guidelines listed in the user s manual e Calibration Equipment should only be used by Trained Personnel 1 2 2 A Cautions
6. INGAPORE Phone 65 737 2922 Telefax 65 737 5155 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 Voltage e Complete description of the problem 2 Introduction 2 2 1 Introduction General The Hart Metal Sheath Standard Platinum Resistance Thermometer SPRT is designed to be an excellent primary standard interpolating instrument con verting temperature to resistance Hart Scientific offers three models 5680 5682 and 5699 Models 5680 and 5682 metal sheath SPRTs cover the In ternational Temperature Scale of 1990 ITS 90 range from below the Triple Point of Argon 189 C to 480 C The 5699 metal sheath SPRT covers the ITS 90 range from below the Triple Point of Argon 189 C to 661 C The 5680 has a resistance of 250 at the triple point of water 0 01 C the 5682 has a resistance of 1000 at the triple point of water and the 5699 has a re sistance of 25 50 at the triple point of water These metal sheath SPRTs are hand constructed at Hart Scientific by experts with years of SPRT manufacturing experience Each SPRT is carefully an nealed at the appropriate temperatures and precisely tested for stability The sensing element is fabricated using high purity platinum wire wound in a strain free design on a special frame The 5680 and 5682 sensors are protected by a ceramic capsule The 5699 s
7. N BEFORE REMOVING THE SPRT FROM THE SHIPPING BOX OR CASE The 5680 5682 5699 Standard Platinum Resistance Thermometers SPRTs are extremely delicate instruments Great care must be taken when han dling the SPRT to maintain the calibration accuracy Vibration or shock may cause the resistance to increase A slight tap to the SPRT tip as it is removed from an instrument can cause a change in R as high as 1 mK Correct han dling of the SPRT will prolong the life expectancy When not in use the SPRT should be stored in the protective case provided by Hart Scientific SPRT Handling Guidelines IR DO keep the thermometer as clean as possible Always remove any fluid from the sheath immediately after taking the thermometer from a bath 2 DO immerse the thermometer in the appropriate liquid for the tem perature range If a dry block is used the well diameter should al low the SPRT 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 sensor Do not submerge the han dles 3 DO allow sufficient time for the thermometer to stabilize before mak ing measurements allowing for the best accuracy 4 DO use the correct drive current with the thermometer to prevent er ror in temperature or resistance 5 DO anneal the thermometer at 480 C for the 5680 and 5682 and at 661 C for t
8. PRT User s Guide 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 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 EMP 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 6 5 Measuring Current Each SPRT has a specified drive current depending upon the particular sen sor The recommended currents are in the following table Model Resistance Drive Current 5680 250 1 0 mA 5682 10022 0 5 mA or 1 0 mA 5699 250 1 0 mA Errors caused by self heating of the element need to be minimized Allow ing sufficient time for the SPRT to stabilize and the heat to be dispersed into the surrounding medium will provide the most accurate results The Model 5680 5682 5699 measurements are made at 1 mA and 1 4 mA These measurements are then extrapolated to zero current This can be done graphically by plotting i vs R and extrapolating to zero power or by using the following equation HR R 2 2 R R where Ro Zero current resistance R Resistance measured at current i R Resist
9. Q at 20 C Construction The Model 5680 5682 SPRTs cover the range from 200 C to 480 C and the Model 5699 SPRT covers 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 metal sheathed SPRTs are provided with a terminal box handle The eight foot cable has five polyethylene coated wires enclosed in a super flex rubber jacket with a stainless steel spring strain relief Gold plated spade 5680 5682 5699 SPRT User s Guide lugs terminate the wires The fifth wire is a ground wire which is connected to the Inconel sheath 3 4 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 d
10. ance measured at current i Equation 2 Calculation of RO 6 6 Cooling Rates at High Temperatures The equilibrium concentration of point defects in the pure platinum wire in crease exponentially to the increase in temperature If a high cooling rate i e removing a SPRT from a high temperature and cooling it to room tem perature in less than a minute occurs above 500 C some of the point de fects in the platinum wire become trapped in the crystalline structure 16 6 Operation causing a slight increase in resistance This slight increase in resistance can be reversed by annealing the SPRT To avoid this problem slowly cool the SPRT at a rate of roughly 150 C hour above 500 C before removing to room temperature The SPRT can be safely removed from an instrument at 500 C or less and cooled to room temperature without concern for the cooling rate 17 7 Accessories Accessories Case The SPRTs are shipped in a protective case The SPRT should be stored in this case when not in use The SPRT should be shipped in this case when returning see Section 2 5 Return Procedure 19 8 Troubleshooting Troubleshooting Troubleshooting In the event that the probe 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 understa
11. ange Contact a Hart Scientific Authorized Service Center
12. cushion the SPRT against mechanical shocks The cover of the crate should be attached with screws Labeling as extremely fragile is recommended Whether the thermometer is returned for repair or warranty please include a letter containing the following information e Description of the faulty operation and circumstances of failure e Complete shipping instructions for the return of the thermometer to the customer 3 Specifications and Warranty 3 2 3 3 Specifications and Warranty Specifications Table 2 Specifications 5680 5682 5699 Temperature Range 200 C to 480 C 200 C to 661 C Resistance Value at 25 50 0 50 1002 1 09 25 50 0 50 TPW Specified Current 1 mA 1 mA or 0 5 mA 1mA Resistance Ratio W 234 3156K lt 0 844235 W 302 9146K gt 1 11807 Sensitivity 0 10 C 0 4Q C 0 10 C Stability lt 0 010 C 100 hours at 480 C lt 8 mK per year max typically lt 0 005 C typically 2 3 mK per year Repeatability lt 2mK lt 1mK Diameter of Pt Sen 0 07 mm 0 003 0 04 mm 0 0016 0 07 mm 0 003 sor Wire Lead Wires 5 four sensor wires plus grounding wire Protective Sheath Inconel 600 Diameter 6 35 mm 0 25 Length 485 mm 19 1 Inconel 600 Diameter 5 56 mm 0 13 mm 0 219 40 005 0 127 mm 0 005 Length 482 mm 19 Insulation Resistance gt 100MQ at 480 C gt 1000MQ at 20 C gt 100MQ at 661 C gt 1000M
13. e to the sensor If the fluid bath used does not have a lid designed for SPRT insertion clamps should be used to ensure that 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 al low for the thermal expansion of the thermometer sheath when determining block well tolerances Lead Wire Identification The Model 5680 5682 5699 SPRTs are equipped with a five wire cable Four lead wires are used to cancel lead wire resistance The fifth wire is a ground wire which is connected to the Inconel sheath For best results the readout device should be equipped to handle four terminal resistors The lead wire colors are red black white yellow and green Lead wire pairs attached to each end of the sensor are identified by heat shrink tub ing Red and black wires have red heat shrink tubing Blue and white wires 5680 5682 5699 SPRT User s Guide have black heat shrink tubing The green wire is the ground wire which should be connected to the ground See Figure 2 White Red BLACK RED Yellow R Black to ground connected to Inconel sheath GREEN Figure 2 Circuit Schematic 4 Installation 5 SPRT Care and Handling Guidelines 5 5 1 5 2 SPRT Care and Handling Guidelines SPRT Care A CAUTION READ THIS SECTIO
14. efective 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 call ing or writing a Hart Scientific Authorized Service Center 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 10 4 Installation 4 4 1 4 2 4 3 Installation Environmental Issues Primary standard equipment should be used in a calibration laboratory or other facility specifically designed for this purpose Environmental require ments 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 SPRT must be mounted carefully to avoid any damag
15. ensor is protected by a platinum capsule The sensors are pressure sealed with a special argon oxygen mixed gas and fit with a terminal box handle with a strain relieved connec tion to the five wire cable Gold plated spade lugs terminate the wires Figure 1 5680 5682 5699 Metal Sheath Platinum Resistance Thermometer 5680 5682 5699 SPRT User s Guide 2 2 2 3 2 3 1 2 4 2 5 2 Introduction Application Hart Scientific metal sheath SPRTs are classified as primary standards A primary standard is defined in terms of transfer of the ITS 90 from a stan dards laboratory to a customer s laboratory Primary standards are calibrated in a standards lab using known intrinsic values Calibration In order for any instrument to be used as a standard it must be calibrated The SPRT may be purchased calibrated or non calibrated Hart has the ca pability to perform fixed point or comparison calibrations traceable to NIST They can be economically calibrated using the comparison method or any one of several fixed point calibrations matching ITS 90 subranges Calibration Intervals Accuracy required for the application and the condition of use dictate the calibration intervals Calibration checks at the triple point of water should be accomplished periodically and the results recorded Once a written his tory of the SPRT is available calibration intervals can be adjusted The SPRT does not need to be recalibrated as long as the chan
16. ge in resistance does not exceed the owner s specifications Depending on the user s Quality Assurance requirements the SPRT 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 Recalibration The recalibration of the SPRTs should be scheduled according to the user s company Quality Assurance requirements Normally an SPRT is recalibrated annually Unless the SPRT is used only over a limited range calibration over the full range of the SPRT 200 C to 480 C for the 5680 and 5682 and 200 C to 661 C for the 5699 is recommended For information on recalibrating your SPRT contact a Hart Scientific Authorized Service Center see Section 1 3 for calibration options an RMA number and current pricing Return Procedure Call a Hart Scientific Authorized Service Center for an RMA number be fore shipping Extreme care must be taken in shipping a SPRT Place the thermometer in its factory provided protective storage case Be sure the case is latched se 2 Introduction curely Place the protective case in the original manufacturer s wooden shipping crate or wooden crate with similar dimensions 44 1 2 in x 11 3 4 in x 11 3 4 in Place soft insulation on all sides of the crate to
17. he 5699 when it has been subjected to mechanical or temperature shock The SPRT should also be annealed before cali bration 6 DO use the protective case provided or other protection when the thermometer is not in use DON T subject the thermometer to any physical shock or vibration 8 DON T subject the thermometer to temperatures above the highest specified operating temperature 18 5680 5682 5699 SPRT User s Guide 14 9 DON T expose the thermometer s handle or cables to extreme tem peratures 10 DON T submerge the handle or cable in liguids Model 5699 only 11 DO anneal the SPRT after delivery or when using at a temperature higher than 600 C 12 DON T take the SPRT out directly when it has been at a temperature higher than 500 C Allow the SPRT to cool to a temperature less than 500 C before removing it to room temperature See Section 6 6 for more information 6 Operation 6 2 6 3 6 4 Operation General For best results be familiar with the operation of the calibration bath or fur nace and the read out instrument Be sure to follow the manufacturer s in structions for the read out instrument and the calibration bath or furnace Comparison Calibration of Other Instruments The uniformity and stability of the bath and the degree of accuracy reguired determine the number of temperature measurements necessary However to follow good practice procedures always measure the tri
18. nd and solve the problem If the probe seems faulty or the problem cannot otherwise be solved con tact a Hart Scientific Authorized Service Center see Section 1 3 for assis tance Be sure to have the model number and serial number of your probe available Problem Solution Data changes e Slight mechanical shock can cause temperature errors as much as 2mK If this is observed first measure and re cord the R Next anneal the SPRT at 480 C 5680 and 5682 or 661 5699 only 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 SPRT If the R does not stabilize contact a Hart Scientific Authorized Service Center Oxidation of the platinum sensor may occur after pro longed use between 200 450 C R will show an in crease To reduce the effects of oxidation anneal the SPRT at 480 C 5680 and 5682 or 661 C 5699 only overnight 12 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 SPRT is usable If the R is not within calibration toler ance but it is stable recalibrate the SPRT Severe mechanical shock can permanently damage the SPRT If annealing the SPRT does not resolve the data change contact a Hart Scientific Authorized Service
19. ple point of water Rip after each temperature measurement This provides the most accurate measurement of the ratio W t Alt Rito Equation 1 Resistance Ratio Equation 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 However the effect of the shunt resistance is insignificant Full immersion is recommended in a furnace or freeze point cell The immersion depth for primary standards is dependent on several factors including accuracy requirements and type of liquid Therefore we recom mend a 203 mm 8 inch minimum immersion depth The exact immersion depth required can be determined by performing a gradient test taking measurements approximately every 127 mm 0 5 inch 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 Thermal EMF Two factors contribute to thermal EMF chemical consistency and physical consistency Variations in chemical structure and discrepancies in crystal structure due to impurities can contribute to thermal EMF These factors are minimized by annealing the full length of wire before construction of the SPRT 15 5680 5682 5699 S
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