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5626/5628
Platinum Resistance Thermometer
User's Guide
March 2014
© 2014 Fluke Corporation. All rights reserved. Specifications are subject to change without notice.
All product names are trademarks of their respective companies.
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1.888.610.7664
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Table of Contents
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Summary of Contents for Fluke 5626
- Page 1 5626/5628 Platinum Resistance Thermometer User's Guide March 2014 © 2014 Fluke Corporation. All rights reserved. Specifications are subject to change without notice. All product names are trademarks of their respective companies. MyFlukeStore 1.888.610.7664 www. .com Shop for Fluke products online at:...
- Page 2 Fluke authorized resellers shall extend this warranty on new and unused products to end-user customers only but have no authority to extend a greater or different warranty on behalf of Fluke. Warranty support is available only if product is purchased through a Fluke authorized sales outlet or Buyer has paid the applicable international price.
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Page 3: Table Of Contents
Mounting ..................4-1 Lead Wire Identification ............. 4-2 PRT Care and Handling Guidelines ........... 5-1 PRT Care ................... 5-1 PRT Handling Guidelines ............5-2 Operation ..................... 6-1 General ..................6-1 MyFlukeStore 1.888.610.7664 www. .com Shop for Fluke products online at:... - Page 4 Comparison Calibration of Other Instruments ......6-1 Immersion Requirements............6-1 Thermal EMF ................6-2 Accessories ..................7-1 Case Options ................7-1 PRT Termination................ 7-1 Troubleshooting .................. 8-1 Troubleshooting ................. 8-1 MyFlukeStore 1.888.610.7664 www. .com Shop for Fluke products online at:...
- Page 5 List of Tables Table Title Page International Electrical Symbols ..............1-1 Specifications .................... 3-1 MyFlukeStore 1.888.610.7664 www. .com Shop for Fluke products online at:...
- Page 6 List of Figures Figure Title Page The 5626 and 5628 Platinum Resistance Thermometers ......2-2 Standard Dimensions ................3-2 PRT Schematic ..................4-2 Probe Termination Examples ..............7-1 MyFlukeStore 1.888.610.7664 www. .com Shop for Fluke products online at:...
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Page 7: Before You Start
Examples include household, office, and laboratory appliances. C-TIC Australian EMC Mark The European Waste Electrical and Electronic Equipment (WEEE) Directive (2002/96/EC) mark. MyFlukeStore 1.888.610.7664 www. .com Shop for Fluke products online at:... -
Page 8: Safety Information
Incorrect handling can damage the PRT and void the warranty. • Keep the shipping container in case it is necessary to ship the PRT. Incorrect packaging of the PRT for shipment can cause irreparable damage. MyFlukeStore 1.888.610.7664 www. .com Shop for Fluke products online at:... -
Page 9: The 5626 And 5628 Platinum Resistance Thermometers
Temperature Scale of 1990 (ITS-90) range from −200 °C to 661 °C. Two standard resistance values are available. The 5626 is 100 Ω and the 5628 is 25.5 Ω. Standard lengths are 12, 15, and 20 inches. Custom lengths are available on request. -
Page 10: Calibration
PRTs are calibrated in Hart’s Scientific Calibration laboratory and provided 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 secondary PRT is calibrated by comparison method. -
Page 11: Specifications
304.8 mm x 6.35 mm dia. (12" L x 0.25") Size 381 mm x 6.35 mm dia.(15" L x 0.25”) 508 mm x 6.35 mm dia. (20" L x 0.25") MyFlukeStore 1.888.610.7664 www. .com Shop for Fluke products online at:... -
Page 12: Construction
Figure 2. Standard Dimensions 3.2 Construction The 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. -
Page 13: Installation
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. MyFlukeStore 1.888.610.7664 www. .com Shop for Fluke products online at:... -
Page 14: Lead Wire Identification
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. MyFlukeStore 1.888.610.7664 www. .com Shop for Fluke products online at:... -
Page 15: Prt Care And Handling Guidelines
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 calibration accuracy. The stress free design of the PRT sensor reduces the effects of mechanical shock. -
Page 16: Prt Handling Guidelines
This allows for the best accuracy. • DO use the correct drive current with the thermometer to prevent error in temperature or resistance. Fluke recommends 1mA. • DO anneal the thermometer at 600 to 661 °C for 12 hours if it becomes oxidized. -
Page 17: Operation
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 element to the housing. MyFlukeStore 1.888.610.7664 www. .com Shop for Fluke products online at:... -
Page 18: Thermal Emf
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. MyFlukeStore 1.888.610.7664 www. .com Shop for Fluke products online at:... -
Page 19: Accessories
Chapter 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 2609 PRT Protective Case for 5626-15, 5628-15, 5626-20, and 5628-20 PRT 7.2 PRT Termination... -
Page 20: Probe Termination Examples
5626/5628 User's Guide Spade Lug (standard) Bare Wire (customer option) 5-Pin DIN (customer option) Figure 4. Probe Termination Examples MyFlukeStore 1.888.610.7664 www. .com Shop for Fluke products online at:... -
Page 21: Troubleshooting
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 MyFlukeStore 1.888.610.7664 www. .com Shop for Fluke products online at:... - Page 22 • If the resistance of the PRT is less than the rated resistance, e.g. 70 Ω for the 5626, there may be a short in the sensor. Contact an Authorized Scientific Service Center (see Section 1.3). Temperature readout different than •...