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Hart Scientific
5623A
Platinum Resistance Thermometer
User’s Guide
Rev. 5A1101
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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 www.hartscientific.com Subject to change without notice. � Copyright © 2004 � Printed in USA Rev. 5A1101
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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 ...................................................2 1.3 Hart Scientific Authorized Service Centers ..........................3 2 Introduction ..............................5 2.1 General ...........................................
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Figures Figure 1 PRT Schematic.........................................9 ii
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Tables Table 1 International Electrical Symbols ................................1 Table 2 Specifications .........................................7 iii
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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 symbols 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 5623A 1
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1 Before You Start Symbol Description Canadian Standards Association OVERVOLTAGE (Installation) CATEGORY II, Pollution Degree 2 per IEC1010-1 refers to the CAT level of Impulse Withstand Voltage protection provided. Equipment of OVERVOLTAGE CATE- GORY II is energy-consuming 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. Oth
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1 Before You Start • 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. 1.3 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
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1 Before You Start Fluke South East Asia Pte Ltd. Fluke ASEAN Regional Office Service Center 83 Clemenceau Avenue #15-15/06 Ue Square 239920 SINGAPORE Phone: +65-737-2922 Telefax: +65-737-5155 E-mail: antng@singa.fluke.com When contacting these Service Centers for support, please have the following information available: • Model Number • Serial Number • Complete description of the problem 4 Hart Scientific
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2 Introduction 2 Introduction 2.1 General The Platinum Resistance Thermometers (PRT) model 5623A is designed to be a secondary standard interpolating instrument converting temperature to resis- tance. The 5623A assembly design allows for exposure to very cold tempera- ture (–200°C) and is an ideal reference for verification, monitoring or calibrating control sensors in located in freezers or incubators. The 5623A may also be used as a temperature standard for calibration of industrial sensors. T
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3 Specifications and Warranty 3 Specifications and Warranty 3.1 Specifications See Table 2. Table 2 Specifications Temperature Range –200°C to 156°C Entire Assembly Range –200°C to 156°C Accuracy (Includes calibration ±0.05°C (full range) uncertainty and short-term stability) Long-term Drift (°C) <±0.01 at 0°C per year, when used periodically at 200 Hysteresis (°C) <0.01 Temperature Coefficient 0.003925 ohms/ohms/°C Size (O.D.) 0.25" (6.35 mm) Sheath Length 6" (152.4 mm) Sheath Material Inconel
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3 Specifications and Warranty To exercise this warranty, the purchaser must forward the product after calling 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 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 P
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4 Installation 4 Installation 4.1 Lead Wire Identification The 5623A PRT is equipped with a four-wire cable (see Figure 1). Four lead wires are used to cancel lead wire resistance. For best results, the readout de- vice should be equipped to handle four-terminal resistors. White Red White Red Figure 1 PRT Schematic The lead wires are two different colors. Lead wire pairs attached to each end of the sensor are identified by red and white insulation. 5623A 9
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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 Care must be taken in handling the PRT to maintain calibration accuracy. 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 an optional protectiv
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5 PRT Care and Handling Guidelines • DO NOT screw a clamp down so tight that it dents the sheath. This can permanently damage the PRT. 12 Hart Scientific
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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. Be sure to follow the manufacturer’s instructions for the read-out instrument and the heat source. 6.2 Immersion Requirements Stem effect can cause measurement errors for any thermometer not immersed in the fluid at least 114 mm (4.5 inches). This error is due to heat lost or gained by the sensing element through the thermometer stem. In addition, heat losses occur
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7 Troubleshooting 7 Troubleshooting 7.1 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 an Au- thorized Hart Scientific Service Center (see Section
