[time-nuts] temperature sensor

[Bill Dailey]

In a container, as steam condenses the pressure will drop.  The steam will stay saturated.  This is as long as the container contains steam only.  Eventually, as the steam cools and condenses you will be left with a vacuum contains only minimal water vapor.

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> On Jul 22, 2014, at 2:11 PM, Attila Kinali <attila at kinali.ch> wrote:
> 
> 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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