RE: Measuring CH water temperature?

["Nigel Giddings" <nigel@xxxxxxxxxxxxxx>]

Piers,



I realise there may be times when you need very accurate measurements of
temperature but the additional cost and fault liability, replacement
issue, of actually having a probe in the system compared to one glued,
taped or strapped to a copper pipe (and then insulated to negate ambient
air temperature influence) would suggest a level of accuracy required
for a chemical plant...



I wonder what sort of transducer you intend to use and how this will be
input to your monitoring system?



I have found Dallas 1-wire devices to give an adequate indication in all
my dealings. You can then compensate in s/w if you find the readings
offset. I have been using these to measure air temperature in rooms for
a number of years now....



Nigel



-----Original Message-----
From: Piers Kittel [mailto:mailing@xxxxxxx]
Sent: 15 May 2008 15:08
Subject: [ukha_d] Measuring CH water temperature?



Hi all,

For some reason, I now want to measure the temperature of my central
heating system. While I could tape a temperature sensor on the pipe,
I think the reading would be inaccurate and unreliable, I would like
to be able to immerse the sensor in the water itself. I'm going to do
a lot of plumbing with my central heating system soon, so I'd like to
plumb in the sensors while the system's drained and pipes cut/
disconnected, and connect the sensors up later on. Do anyone know of
something like a short pipe and a temperature sensor embedded in the
pipe ready for plumbing directly into a copper/plastic central heating
system? If not, can I put something similar together without
compromising the pressurised system? I don't fancy leaks like
everyone else :)

Thanks for your help in advance!

Regards - Piers





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