S
Syd Rumpo
On 30/05/2012 16:43, Jamie wrote:
I don't think so. The 'cold' junction is inside the thermocouple
readout device and its temperature is measured using an absolute device
such as a thermistor, maybe a PRT. The 'cold' junction will often be
made from fairly substantial material to damp any fast temperature
changes and maintain an even temperature (an isothermal block) and to
couple easily to the thermistor.
As long as your thermocouple wire is maintained all the way to the
readout, either with thermocouple wire or appropriate compensating
cable, and providing the connectors are of the correct material, then
all is well.
Cheers
other issues with thermocouple process units is they need to operating
in the same ambient temperature as the device the probe is connected too.
The cold junction reference will miss calculate otherwise.
I don't think so. The 'cold' junction is inside the thermocouple
readout device and its temperature is measured using an absolute device
such as a thermistor, maybe a PRT. The 'cold' junction will often be
made from fairly substantial material to damp any fast temperature
changes and maintain an even temperature (an isothermal block) and to
couple easily to the thermistor.
As long as your thermocouple wire is maintained all the way to the
readout, either with thermocouple wire or appropriate compensating
cable, and providing the connectors are of the correct material, then
all is well.
Cheers