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Hart Scientific
5626/5628
PlatinumResistanceThermometer
User’sGuide
Rev. 532801
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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. 532801
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Table of Contents 1 Before You Start . . . . . . . . . . . . . . . . . . . . . . 1 1.1 Symbols Used . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Safety Information . . . . . . . . . . . . . . . . . . . . . . . 2 1.2.1 Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.2.2 Cautions . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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7.1 Case Options . . . . . . . . . . . . . . . . . . . . . . . . . 15 7.2 PRT Termination . . . . . . . . . . . . . . . . . . . . . . . 15 8 Troubleshooting . . . . . . . . . . . . . . . . . . . . . 17 8.1 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . 17 ii
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Figures Figure 1 Hart Model 5626 and 5628 Platinum Resistance Thermometers. . . . . . 5 Figure 2 Standard Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Figure 3 PRT Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Figure 4 Probe Termination Examples . . . . . . . . . . . . . . . . . . . . . . . 15 iii
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Tables Table 1 International Electrical Symbols . . . . . . . . . . . . . . . . . . . . . . 1 Table 2 Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 iv
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1 Before You Start 1 Before You Start 1.1 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 AC (Alternating Current) AC-DC Battery 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 1
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5626/5628 User’s Guide Symbol Description Canadian Standards Association OVERVOLTAGE (Installation) CATEGORY II, Pollution Degree 2 per CAT 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. C-TICAustralianEMC Mark The European Waste Electrical and Electronic Equipment (WEEE) Di- rective (200
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1 Before You Start • DO NOT drop or bang the probe in any way. This will cause damage to the probe internally and affect its calibration. • 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. • 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. 1.3 Hart Scientific Authorized Ser
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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 ASEAN Regional Office Service Center 60 Alexandra Terrace #03-16 The Comtech (Lobby D) 118502 SINGAPORE Phone: +65 6799-5588 Telefax: +65 6799-5588 E-mail: antng@singa.fluke.com When contacting these Service Centers for support, please have the follow- ing information available: • Model Number • Serial Number • Complete description of the problem 4
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2 Introduction 2 Introduction 2.1 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 100Ω and the 5628 is 25.5Ω. S
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5626/5628 User’s Guide calibrated using a primary standard that has been calibrated in a primary calibration laboratory using known intrinsic values. 2.3 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 po
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3 Specifications and Warranty 3 Specifications and Warranty 3.1 Specifications See Table 2 and Figure 2. Table 2 Specifications 5626 5628 Temperature Range –200°C to 661°C R 100Ω ±1Ω at 0.01°C 25.5Ω ±0.5Ω at 0.01°C tp Resistance RatioW(Ga) W(302.9146K) ≥1.11807 α ≥ 0.003925 Calibration Uncertainty ±0.006°C at –200°C (k=2) ±0.004°C at 0°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 ) ≤0.03°C with 500 hours at ≤0.02°C with 500 hours at tp 661°C 66
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5626/5628 User’s Guide 3.2 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. 3.3 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. 3.4 Warranty Hart Scientific, Inc
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4 Installation 4 Installation 4.1 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: • Stable temperature and relative humidity <80% • Clean, draft-free area • Low noise 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 cali- b
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5 PRT Care and Handling Guidelines 5 PRT Care and Handling Guidelines 5.1 PRT Care 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 the sensor at high temperature have been eliminated. Ho
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5626/5628 User’s Guide • 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 therm
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6 Operation 6 Operation 6.1 General For best results, be familiar with the operation of the heat source and the read-out instrument.Besuretofollowthe manufacturer’s instructions for the read-out instrument and the heat source. 6.2 Comparison Calibration of Other Instruments The uniformity 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
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5626/5628 User’s Guide 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 beasourceofthermal EMF. Thethermal EMFiscausedbyad
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7 Accessories 7 Accessories 7.1 Case Options The 5626/5628 PRT comes in a rigid case appropriate for the length of the probe. • Model Number 2601 PRT Protective Case for 5626-12 and 5628-12 PRT • Model Number 2602 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: • Gold Plated Spade Lug • Bare Wire • 5-Pin Din Connector Spade Lug (standard) Bare Wire (customer o
