| Hart's high-temperature secondary standards fill the
gap between affordable, but temperature-limited secondary PRT's and
more expensive accurate SRPT's. If your using block calibrators,
furnaces, or temperature points above normal PRT temperatures (420°C),
then the 5626 PRT is for you. The 5626 is nominally 100Ω
and a temperature range of -200°C to 661°C.
Using a regular PRT at temperatures above 500°C
exposes the platinum to contamination. If the PRT is used as a
reference or calibration standard, contamination is a major problem.
SPRTs, which are more expensive and delicate, can handle the higher
temperatures, but with greater risk to the instrument due to shock,
contamination, or mishandling. The 5626 is designed to reduce the
contamination risk through the use of internal protection while not
impairing performance. |
