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GLASS CAPSULE SPRT - Model 5686

5686

Features

  • Temperatures from –260°C (13K) to 232°C
  • Stability typically 0.001°C over 100°C range
  • Miniature capsule package eliminates stem conduction

Specifications 

Temperature Range 

5686: –260 °C to 232 °C (13K to 505K)

Nominal R TPW  

25.5W 

Resistance Ratio 

W(302.9146K) ³ 1.11807
W(234.3156K) £ 0.844235 

Drift Rate 

5686: < 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 Gas 

5686: helium

Lead Wires 

Four platinum wires, 30 mm long (1.18 in) 

Size 

5686: 5.8 mm dia. x 56 mm long (0.23 x 2.2 in)

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:

W(302.9146K) ³ 1.11807
and
W(234.3156K) £ 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 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.

5686_18.JPG

Ordering Information 

5686-B 

Glass Capsule SPRT, –260 °C to 232 °C† 

†Maple carrying case included 

Downloads

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