Glass Capsule SPRT Hart Scientific Model 5686

Glass Capsule SPRT Hart Scientific Model 5686

Sometimes you would like to make SPRT measurements but traditional SPRTs are too long or awkward for a particular application. Now Hart makes the Model 5686 Glass Capsule SPRT, which is 56 mm long and 5.88 mm in diameter.

It’s perfect for cryogenics, calorimetry and other metrology work requiring small SPRTs.

The Model 5686 is a true SPRT. The high-purity platinum wire is hand-wound on a glass crossframe 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 with helium gas, and come protected in their own maple case.

The Model 5686 Glass Capsule SPRT complies completely with ITS-90 and has a resistance ratio of:

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

This SPRT is small but meets customary SPRT performance for reproducibility, reliability and stability. It solves many of the problems associated with taking precision measurements in situations unsuitable for traditional-length SPRTs. This is an excellent calibration instrument.