Is anyone able to tel what the voltage changes are for a thermocouple for each degree C.
Regards SP South Africa
Thermocouple
Jun 24, 2004
2 Replies
First of all, it depends on the type of thermocouple. K-type is the most common for pottery (R and S platinum types are too expensive, and J type doesn't go hot enough). Also, the response is non-linear, so if accuracy is needed you should use a table. You can download tables of mV versus temperature for any thermocouple type from the US National Bureau of Standards. but I don't have the link... try Googling for "NBS Thermocouple table" or something.
Anyway, to give you an idea of the values, the output of a K type at 1200C is 48.828 mV, while at 1210C it is 49.192 mV. These assume the reference junction is at 0C.
Hope this helps.
Bob Masta dqatechATdaqartaDOTcom D A Q A R T A Data AcQuisition And Real-Time Analysis
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SP, Depends on the "type " of thermocouple (TC) The higher types are type K and J. There is also a factor known as cold junction compensation. Without the compensation, if you just hook a volt meter up, you could be off as far as
90 degrees (F) or so. Here's are some sites for a little theory:
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that doesn't do it for ya, here's some deep theory:
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's where you can view some voltage tables for various types of TC:
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down to "Thermocouple Reference Data" and select the type and degreesC or F also here:
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Good luck! Tony
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