5680 5682 5699 User`s Guide.vp
Contents
1. 10 3 4 Warranty 10 4 Installation 13 4 1 Environmental Issues 13 4 2 Mounting 13 4 3 Lead Wire Identification 13 5 SPRT Care and Handling Guidelines 15 5 1 SPRT Care 15 5 2 SPRT Handling Guidelines 15 6 Operation 17 6 1 General 17 6 2 Comparison Calibration of Other Instruments 17 6 3 Immersion Requirements 17 6 4 Thermal EMF 17 6 5 Measuring Current 18 i 6 6 Cooling Rates at High Temperatures 19 7 Accessories 21 7 1 Case 21 8 Troubleshooting 23 8 1 Troubleshooting 23 ii Figures and Tables Table 1 International Electrical Symbols2. 1 Table 2 Warnings and Cautions 2 Figure 1 5680 5682 5699 Metal Sheath Platinum Resistance Thermometer 6 Table 3 Specifications 9 Figure 2 Circuit Schematic 14 iii 1 Before You Start 1 1 Symbols Used Table 1 lists the International Electrical Symbols and the meaning of each symbol Some or all of these symbols may be used on the instru ment or in this manual Symbol Description AC AC DC Battery CE DC Double Insulated Electric Shock Fuse Ground Hot Surface Read the User s Manual Off On 5680 5682 5699 SPRTs Manual Rev 9C2001 1 1 Before You Start Table 1 International Electrical Symbols 1 2 Safety Information Use this instrument only as specified in this manual Otherwise the pro tection provided by the instrument may be impaired Refer to the safety information in Table 2 Warnings and Cautions 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 in strument being used Warnings To avoid possible electric shock or personal injury follow these guidelines DO NOT use this instrument to measure the tempe
3. 3 DO allow sufficient time for the thermometer to stabilize before making measurements allowing for the best accuracy 4 DO use the correct drive current with the thermometer to prevent error in temperature or resistance 5 DO anneal the thermometer at 480 C for the 5680 and 5682 and at 661 C for the 5699 when it has been subjected to me chanical or temperature shock The SPRT should also be an nealed before calibration 5680 5682 5699 SPRTs Manual Rev 9C2001 15 5 SPRT Care and Handling Guidelines 6 DO use the protective case provided or other protection when the thermometer is not in use 7 DON T subject the thermometer to any physical shock or vibra tion 8 DON T subject the thermometer to temperatures above the high est specified operating temperature 9 DON T expose the thermometer s handle or cables to extreme temperatures 10 DON T submerge the handle or cable in liquids Model 5699 only 11 DO anneal the SPRT after delivery or when using at a tempera ture higher than 600 C 12 DON T take the SPRT out directly when it has been at a temper ature higher than 500 C Allow the SPRT to cool to a tempera ture less than 500 C before removing it to room temperature See Section 6 6 for more information 16 Manual Rev 9C2001 Hart Scientific 5 SPRT Care and Handling Guidelines 6 Operation 6 1 General For best results be familiar with the operation of the calibrati
4. 5682 5699 SPRTs Manual Rev 9C2001 19 6 Operation 7 Accessories 7 1 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 5680 5682 5699 SPRTs Manual Rev 9C2001 21 7 Accessories 8 Troubleshooting 8 1 Troubleshooting In the event that the probe appears to function abnormally this section may help to find and solve the problem Several possible problem condi tions 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 other wise be solved contact Hart Scientific Customer Service for assistance 1 801 763 1600 Be sure to have the model number and serial number of your probe available Problem Solution Data changes Slight mechanical shock can cause temperature er rors as much as 2mK If this is observed first mea sure and record the Rtp Next anneal the SPRT at 480 C 5680 and 5682 or 661 5699 only over night Measure the Rtp again The annealing should decrease the Rtp Repeat the annealing Rtp mea surement cycle several times When the Rtp is sta ble recalibrate the SPRT If the Rtp does not stabilize contact Hart Scientific Customer Service Oxidation of the platinum sensor may occur after prolonged us
5. 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 Hart for authorization Hart assumes NO risk for in tran sit damage For service or assistance please contact the manufacturer Hart Scientific Inc 799 East Utah Valley Drive American Fork UT 84003 9775 Phone 801 763 1600 Fax 801 763 1010 E mail support hartscientific com 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 10 Manual Rev 9C2001 Hart Scientific 3 Specifications and Warranty DAMAGES OR LOSS WHETHER IN CONTRACT TORT OR OTHER WISE 5680 5682 5699 SPRTs Manual Rev 9C2001 11 3 Specifications and Warranty 4 Installation 4 1 Environmental Issues Primary standard equipment should be used in a calibration laboratory or other facility specifically designed for this purpose Environmental re quirements include Stable temperature and relative humidity lt 80 Clean draft free area Low n
6. in readings Allow the thermom eter to stabilize at each new depth Plot the results to see the stem effect 6 4 Thermal EMF Two factors contribute to thermal EMF chemical consistency and physi cal consistency Variations in chemical structure and discrepancies in crystal structure due to impurities can contribute to thermal EMF These 5680 5682 5699 SPRTs Manual Rev 9C2001 17 6 Operation factors are minimized by annealing the full length of wire before construc tion of the SPRT Likewise connection to extension lead wires and readout instruments can be a source of thermal EMF The thermal EMF is caused by a differ ence in temperature between two connections If the two connections are the same temperature there will be little or no thermal EMF effects How ever if there is a substantial temperature difference between connec tions 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 reversible current 6 5 Measuring Current Each SPRT has a specified drive current depending upon the particular sensor The recommended currents are in the following table Model Resistance Drive Current 5680 25 1 0 mA 5682 100 0 5 mA or 1 0 mA 5699 25 1 0 mA Errors caused by self heating of the element need to be minimized Al lowi
7. to 480 C and the Model 5699 SPRT covers the range from 189 C to 661 C The sen sor elements are crafted using high purity platinum wire wound in a strain free design on a specially designed support 5680 5682 5699 SPRTs Manual Rev 9C2001 9 3 Specifications and Warranty Table 3 Specifications 3 3 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 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 alter ation 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 de termined upon examination by Hart to be defective If
8. 5680 5682 5699 MetalSheathStandard PlatinumResistanceThermometer User sGuide Rev 9C2001 Copyright 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 Table of Contents 1 Before You Start 1 1 1 Symbols Used 1 1 2 Safety Information 2 1 3 Customer Service Information 3 2 Introduction 5 2 1 General 5 2 2 Application 6 2 3 Calibration 6 2 3 1 Calibration Options 6 2 3 2 Calibration Intervals 7 2 4 Recalibration 7 2 5 Return Procedure 8 3 Specifications and Warranty 9 3 1 Specifications 9 3 2 Construction 9 3 3 Electrical Circuit
9. ainty 0 011 C 0 005 C 0003 C 0 008 C 0 013 C 0 021 C The SPRT is calibrate by comparison to a NIST calibrated SPRT in liquid baths comparison furnace at 661 C Resistance measured by DC ratiometric technique using Hart Scientific Model 1575 A calibration certificate is supplied with ITS 90 constants and Wt vs T table Fixed Point Calibrations Expanded Uncertainty coverage factor K 2 Order No Range Triple Point of Water 0 01 C 0 2 mK 1811 0 C to 157 C TPW in In Freezing Point of Indium 156 5985 C 0 8 mK 1812 0 C to 232 C TPW in Sn Freezing Point of Tin 231 928 C 1 0 mK 1813 0 C to 420 C TPW in Zn Freezing Point of Zinc 419 527 C 1 2 mK 1814 0 C to 661 C TPW in Al Freezing Point of Aluminum 660 323 C 0 2 mK 1815 0 C to 962 C TPW in Ag Freezing Point of Silver 961 78 C 2 0 mK The SPRT is calibrated using ITS 90 fixed points Certificate includes ITS 90 constants and Wt vs T tables 2 3 2 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 history of the SPRT is available calibration intervals can be adjusted The SPRT does not need to be recalibrated as long as the change in re sistance does not exceed the owner s specifications 2 4 Recalibration The recalibrati
10. ction strain relieved connection to the five wire cable Gold plated spade lugs terminate the wires 2 2 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 standards laboratory to a customer s laboratory Primary standards are calibrated in a standards lab using known intrinsic values 2 3 Calibration In order for any instrument to be used as a standard it must be cali brated The SPRT may be purchased calibrated or non calibrated Hart has the capability to perform fixed point or comparison calibrations trace able to NIST They can be economically calibrated using the comparison method or any one of several fixed point calibrations matching ITS 90 subranges 2 3 1 Calibration Options In order for the thermometers to make accurate temperature measure ments they must be calibrated Calibration can be attained through any recognized primary standard laboratory designed to perform temperature 6 Manual Rev 9C2001 Hart Scientific 2 Introduction Figure 1 5680 5682 5699 Metal Sheath Platinum Resistance Thermometer calibrations Hart Scientific can provide either comparison calibration or fixed point calibrations as outlined in the following table Comparison Calibrations Order No Range 1803 100 C to 450 C 1804 100 C to 661 C Points 100 C 38 C 0 01 C 232 C 420 C 661 C Uncert
11. e between 200 450 C Rtp will show an increase To reduce the effects of oxidation an neal the SPRT at 480 C 5680 and 5682 or 661 C 5699 only overnight 12 hours Measure the Rtp again Repeat the annealing Rtp measurement cycle several times This annealing process should return Rtp to within calibration tolerances If the Rtp is within calibration tolerance the SPRT is usable If the Rtp is not within calibration tolerance 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 Hart Scientific Customer Service 5680 5682 5699 SPRTs Manual Rev 9C2001 23 8 Troubleshooting Problem Solution 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 Hart Scientific Customer Service The SPRT may be damaged and need re pair 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 it is 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 tempera ture measurements A ground lead wire the fifth wire of the SPRT may help to reduce electrical noise interference Be sure the ground lead wir
12. e is connected to an appropriate ground on the read out device Temperature readout dif ferent than expected e g the heat source is set at 300 C the SPRT mea sures 275 C Measure the SPRT resistance at TPW If the resistance of the SPRT is less than the rated resistance there may be a short in the sensor Contact Hart Scientific Customer Service If the resistance of the SPRT is only a few ohms there may be a short in the four lead wires Con tact Hart Scientific Customer Service If the SPRT is open the resistance will be Out of Limits or in the kilo ohm or mega ohm range Contact Hart Scientific Customer Service 24 Manual Rev 9C2001 Hart Scientific 8 Troubleshooting
13. nected to the ground See Figure 2 14 Manual Rev 9C2001 Hart Scientific 4 Installation BLACK RED White Blue Red Black Rx GREEN connected to Inconel sheath to ground Figure 2 Circuit Schematic 5 SPRT Care and Handling Guidelines 5 1 SPRT Care Caution READ THIS SECTION 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 handling 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 Rtp as high as 1 mK Correct handling of the SPRT will prolong the life expectancy When not in use the SPRT should be stored in the protective case pro vided by Hart Scientific 5 2 SPRT Handling Guidelines 1 DO keep the thermometer as clean as possible Always remove any fluid from the sheath immediately after taking the thermome ter from a bath 2 DO immerse the thermometer in the appropriate liquid for the temperature range If a dry block is used the well diameter should allow the SPRT to comfortably slip in and out without ex cess 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 handles
14. ng sufficient time for the SPRT to stabilize and the heat to be dis persed 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 R R i R R i i 0 1 1 2 2 1 2 2 1 2 where R0 Zero current resistance R1 Resistance measured at current i1 R2 Resistance measured at current i2 Equation 2 Calculation of R0 18 Manual Rev 9C2001 Hart Scientific 6 Operation 6 6 Cooling Rates at High Temperatures The equilibrium concentration of point defects in the pure platinum wire increase 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 temperature in less than a minute occurs above 500 C some of the point defects in the platinum wire become trapped in the crystalline structure causing a slight increase in resistance This slight increase in resistance can be reversed by annealing the SPRT To avoid this prob lem 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 5680
15. odel Number Serial Number 5680 5682 5699 SPRTs Manual Rev 9C2001 3 1 Before You Start 2 Introduction 2 1 General The Hart Metal Sheath Standard Platinum Resistance Thermometer SPRT is designed to be an excellent primary standard interpolating in strument converting temperature to resistance Hart Scientific offers three models 5680 5682 and 5699 Models 5680 and 5682 metal sheath SPRTs cover the International Temperature Scale of 1990 ITS 90 range from the Triple Point of Argon 189 C to 480 C The 5699 metal sheath SPRT covers the ITS 90 range from the Triple Point of Argon 189 C to 661 C The 5680 has a resistance of 25 at the triple point of water 0 01 C the 5682 has a resistance of 100 at the triple point of water and the 5699 has a resistance of 25 5 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 annealed 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 sensor 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 5680 5682 5699 SPRTs Manual Rev 9C2001 5 2 Introdu
16. oise level low radio frequency magnetic or electrical interfer ence Low vibration levels 4 2 Mounting Most often temperature standards primary and secondary are used to calibrate other temperature sensitive equipment The SPRT must be mounted carefully to avoid any damage 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 im mersed 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 thermal expansion of the thermometer sheath when determining block well tolerances 4 3 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 blue and green Lead wire pairs attached to each end of the sensor are identified by heat shrink tubing Red and black wires have red heat shrink tubing Blue and white 5680 5682 5699 SPRTs Manual Rev 9C2001 13 4 Installation wires have black heat shrink tubing The green wire is the ground wire which should be con
17. on bath or furnace and the read out instrument Be sure to follow the manufacturer s instructions for the read out instrument and the calibration bath or fur nace 6 2 Comparison Calibration of Other Instruments The uniformity and stability of the bath and the degree of accuracy re quired determine the number of temperature measurements necessary However to follow good practice procedures always measure the triple point of water Rtp after each temperature measurement This provides the most accurate measurement of the ratio W t R t R tp Equation 1 Resistance Ratio Equation 6 3 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 addition heat losses occur due to radiation losses from the sensing ele ment to the housing However the effect of the shunt resistance is insig nificant Full immersion is recommended in a furnace or freeze point cell The immersion depth for primary standards is dependent on several fac tors including accuracy requirements and type of liquid Therefore we recommend 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
18. on 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 189 C to 480 C for the 5680 and 5682 and 189 C to 661 C for the 5699 is recommended For infor mation on recalibrating your SPRT contact Hart Scientific s Customer Service department for an RMA number and current pricing see Section 1 Before You Start 5680 5682 5699 SPRTs Manual Rev 9C2001 7 2 Introduction Depending on the user s Quality Assurance requirements the SPRT drift should be checked periodically at the Triple Point of Water TPW Sec tion 8 Troubleshooting provides information on drift with respect to me chanical shock and oxidation If the Rtp cannot be restored after annealing to within calibration tolerances a full recalibration should be scheduled 2 5 Return Procedure Call Hart Scientific s Customer Service for an RMA number before 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 securely 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 cushion the SPRT against mechanical shocks The cove
19. r of the crate should be attached with screws Labeling as extremely fragile is recom mended Whether the thermometer is returned for repair or warranty please in clude a letter containing the following information Description of the faulty operation and circumstances of failure Complete shipping instructions for the return of the thermometer to the customer 8 Manual Rev 9C2001 Hart Scientific 2 Introduction 3 Specifications and Warranty 3 1 Specifications 5680 5682 5699 Temperature Range 189 C to 480 C 189 C to 661 C Resistance Value at TPW 25 5 0 5 100 1 0 25 5 0 5 Specified Current 1 mA 1 mA or 0 5 mA 1mA Resistance Ratio W 234 3156K 0 844235 W 302 9146K 1 11807 Sensitivity 0 1 C 0 4 C 0 1 C Stability lt 0 010 C 100 hours at 480 C typically lt 0 005 C lt 10 mK per year max typically 2 3 mK per year Repeatability lt 1mK Diameter of Pt Sensor Wire 0 07 mm 0 04 mm 0 07 mm Lead Wires 5 four sensor wires plus grounding wire Protective Sheath Inconel 600 Diameter 6 35 mm 0 25 Length 485 mm 19 09 Inconel 600 Diameter 5 56 mm 0 219 0 127 mm 0 005 Length 482 mm 19 Insulation Resistance gt 100M at 480 C gt 1000M at 20 C gt 100M at 661 C gt 1000M at 20 C 3 2 Construction The Model 5680 5682 SPRTs cover the range from 189
20. rature of any hazardous 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 peri ods 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 Person nel Cautions To avoid possible damage to the instrument follow these guidelines DO NOT remove the label from the handle This cautions the user concerning the delicate nature of the instrument Read Section 5 entitled SPRT Care and Handling Guidelines before removing the SPRT from the shipping box or case In correct handling can damage the SPRT and void the warranty Keep the shipping container in case it is necessary to ship the SPRT Incorrect packaging of the SPRT for shipment can cause irreparable damage 2 Manual Rev 9C2001 Hart Scientific 1 Before You Start Table 2 Warnings and Cautions 1 3 Customer Service Information Hart Scientific can be contacted by writing to Hart Scientific Inc 799 E Utah Valley Drive American Fork UT 84003 9775 Or by calling or faxing Telephone 801 763 1600 Fax 801 763 1010 Our World Wide Web site is www hartscientific com When calling Hart Scientific Customer Service please have the following information available M
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