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2 Introduction
2.1 General
The Hart Metal Sheath Standard Platinum Resistance Thermometer (SPRT) is
designed to be an excellent primary standard interpolating instrument convert
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ing 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 below the Triple Point of Ar
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gon (–189°C) to 480°C. The 5699 metal sheath SPRT covers the ITS-90 range
from below the Triple Point of Argon (–189°C) to 661°C. The 5680 has a resis
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tance of 25Ω at the triple point of water (0.01°C), the 5682 has a resistance of
100Ω at the triple point of water, and the 5699 has a resistance of 25.5Ω 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 an
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nealed 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 sen-
sors are pressure sealed with a special argon/oxygen mixed gas and fit with a
terminal box handle with a strain relieved connection to the five wire cable.
Gold plated spade lugs terminate the wires.
5
2 Introduction
General
Figure 1 5680/5682/5699 Metal Sheath Platinum Resistance Thermometer
1.888.610.7664 sales@GlobalTestSupply.com
Fluke-Direct.com
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