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GLASS CAPSULE SPRT - Model 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

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.

Downloads

Right click one of the following links and “Save Target As ...” to download the catalog pages/data sheet or a product User's Guide in Acrobat (.pdf)  format.

• Catalog page(s)/data sheet

• 5686/5695 User's Guide

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