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2-1
Chapter 2
Introduction
2.1 General
The 5626 and 5628 Platinum Resistance Thermometers (PRT) models are
designed to be the best secondary standard interpolating instrument converting
temperature to resistance. The PRTs are used with a readout device 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 100 Ω and the
5628 is 25.5 Ω. Standard lengths are 12, 15, and 20 inches. Custom lengths are
available on request.
The two PRTs are hand constructed by experts with years of PRT manufacturing
experience. Each PRT 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 specially designed support. The
¼ inch O.D. Inconel 600 sheaths are sealed with a specially mixed gas and fit
with a terminal box handle and strain relieved connection to the four-wire cable.
Gold plated spade lugs terminate the wires.
2.2 Application
The 5626 and 5628 thermometers are classified as secondary standards. A
secondary standard is defined in terms of transfer of the ITS-90 from a standards
laboratory to a customer’s laboratory. Secondary standards are
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