thermocouples: 0mv at 0C

[thomas]

Whey do all types of thermocouples output 0mv at 0C? ...was that a design
requirement when the T/C alloys were developed?

 

[thomas]

"andy" <news4@earthsong.free-online.co.uk> wrote in message
newsan.2004.09.09.15.42.31.908863@earthsong.free-online.co.uk...

On Thu, 09 Sep 2004 09:56:12 -0400, thomas wrote:

Whey do all types of thermocouples output 0mv at 0C? ...was that a
design
requirement when the T/C alloys were developed?

They don't - they output 0mv when the two parts of the thermocouple are at
the same temperature. So if one end is at room temp, it will give 0 mv
when the other end is as well.

This isn't anything to do with the design - it's just how the underlying
physics of it works.

--

Ahhh...that whole ICE POINT reference thing ...duh
thx

 

[andy]

On Thu, 09 Sep 2004 09:56:12 -0400, thomas wrote:

Whey do all types of thermocouples output 0mv at 0C? ...was that a design
requirement when the T/C alloys were developed?

They don't - they output 0mv when the two parts of the thermocouple are at
the same temperature. So if one end is at room temp, it will give 0 mv
when the other end is as well.

This isn't anything to do with the design - it's just how the underlying
physics of it works.

--
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