5686-B Glass Capsule SPRT

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  • 5686-B Glass Capsule SPRT

Key features

  • Miniature glass capsule SPRT designed for metrology work that requires small SPRTs.
  • Temperatures range: –260 °C (13 K) to 232 °C and offers stability typically of 0.001 °C over a 100 °C range.
  • Ideal for applications such as cryogenics, calorimetry, and other metrology work where traditional SPRTs may be too long or awkward.
  • True SPRT, with high-purity platinum wire hand-wound on a glass cross frame in a strain-free design.

Product overview: 5686-B Glass Capsule SPRT

The 5686 complies completely with ITS-90 and has the following resistance ratios:

W(302.9146 K) ≥ 1.11807
and
W(234.3156 K) ≤ 0.844235

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 are available for the model 5686 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.

Specifications: 5686-B Glass Capsule SPRT

Specifications
Temperature Range5686: –260 °C to 232 °C (13 K to 505 K)
Nominal RTPW25.5 Ω
Resistance RatioW(302.9146 K) ≥ 1.11807
W(234.3156 K) ≤ 0.844235
Drift Rate5686: < 0.005 °C per year over the entire range
Self-heating at TPW< 0.002 °C under 1 mA current
Reproducibility±0.001 °C or better
R TPW Drift After Thermal Cycling< 0.001 °C
Filling Gas5686: helium
Lead WiresFour platinum wires, 30 mm long (1.18 in)
Size5686: 5.8 mm dia. x 56 mm long (0.23 x 2.2 in)

Models: 5686-B Glass Capsule SPRT

5686-B
Glass Capsule SPRT, –260 °C to 232 °C with Maple carrying case.
Calibration not included.Contact your Fluke Calibration representative for additional calibration options.

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1911-4-9
PRT Calibration, –200 °C to 232 °C, NVLAP Accredited

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