[time-nuts] temperature sensor

Attila Kinali attila at kinali.ch
Tue Jul 22 15:11:44 EDT 2014

On Tue, 22 Jul 2014 01:17:03 +0100
Brian D <groups at planet3.freeuk.co.uk> wrote:

> Saturated steam at standard pressure will be exactly 212F, or 100C.

Stupid question: How to you ensure that the steam is saturated,
while keeping a constant pressure?

I think just buying some indium off ebay and use that as a melting/freezing
reference is easier than the contraption needed to ensure fully saturated
steam, with a low temperature gradient over the temperature sensor.

That said. My investigations into stability of PT100 sensors reveal,
that the quality ones can be less than 10mK/year, but hysteresis is
in the same ball park (see [1]).

			Attila Kinali

[1] "Long term stability and hysteresis effects in Pt100 sensors
used in industry", by Ljungblad, Holmstein, Josefson, Klevedal, 2013

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