Electronics > Beginners
Thermocouople thermometers.
beanflying:
It could have been read either way was the point. A thermocouple by definition is a couple and not a single. You read it one way and he clearly meant it in another and Platinum is their major material of construction alloyed with a small percentage of Rhodium for one side for B, R & S types.
If anyone said to me Platinum temperature sensor or platinum thermometer I would generally think they were referring to RTD's and not the Three main Platinum based Thermocouples.
RTD's are never referred to as Thermocouples.
David Hess:
I just assumed from context that it was a Pt RTD. There is no reason to use a Pt thermocouple for cold junction compensation but a Pt RTD is a great option.
Kleinstein:
Sorry for confusing with the Pt base thermocouples. :palm:
The Tpye B and S thermocouples (2 platinum alloys) are still quite popular for high temperatures.
For cold junction compensation one usually has a large choice of sensors, as the temperature in moderate and the accuracy of thermocouples is usually not very high. So in most cases one can use rather cheap semiconductor based sensors for the cold junction (e.g. a diode). A platinum RTD would be kind of overkill in most cases.
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