Features
- Temperatures from –260°C (13K) to 500°C
- Stability typically 0.001°C over 100°C range
- Miniature capsule package eliminates stem conduction
Specifications
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Temperature Range
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5686: –260 °C to 232 °C (13K to 505K)
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Nominal RTPW
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25.5W
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Resistance Ratio
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W(302.9146K) ³ 1.11807
W(234.3156K) £ 0.844235
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Drift Rate
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5686: < 0.005 °C per year over the entire range
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Self-heating at TPW
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< 0.002 °C under 1 mA current
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Reproducibility
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±0.001 °C or better
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RTPW Drift After Thermal Cycling
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< 0.001 °C
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Filling Gas
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5686: helium
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Lead Wires
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Four platinum wires, 30 mm long (1.18 in)
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Size
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5686: 5.8 mm dia. x 56 mm long (0.23 x 2.2 in)
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Sometimes you would like to make SPRT measurements but traditional SPRTs are too long or awkward for a particular application. Now Hart makes a miniature glass capsule SPRT, which is perfect for cryogenics, calorimetry, and other metrology work requiring small SPRTs.
The 5686 is a
true SPRT. The high-purity platinum wire is hand-wound on a glass cross frame in a strain-free design. The glass capsule is designed to match the thermal expansion of the platinum wire to ensure a true seal at all operating temperatures. The capsules are pressure sealed and come protected in their own maple case.
The 5686 complies
completely with ITS-90 and has the following resistance ratios:
The 5686 covers temperatures from –260°C to 232°C, so it’s perfect for cryogenic applications. It is 5.8 mm in diameter and 56 mm long.
Fixed-point calibrations in Hart’s laboratory are available for the Model 5686 which be calibrated from –200°C to 232°C.
These SPRTs are small but meet customary SPRT performance for reproducibility, reliability, and stability. They solve many of the problems associated with taking precision measurements in situations unsuitable for traditional-length SPRTs. These are excellent calibration instruments.
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