why k type thermocouple is popular over other thermoocuples

 

Hello,

Type K thermocouple is suitable for high temperatures upto 1200 °C.
It is not so good for low temperatures, below 95 °C.

In my job we use often the type T thermocouple.
This has a temperature range of -200 to 350 °C.

More info can be found on this page:
http://instserv.com/rmocoupl.htm

There are more pages like that over here:
http://educypedia.karadimov.info/electronics/thermocouple.htm

Bertus

 

Link provided by you shows useful ranges of different thermocouples.

1. What does useful range means here??? That we should use TC in that range also.
2. But if useful range is son small then why does TC have shown such wide range,

e.g K-type has range of -270C to 1372c, but link shows useful range only 95 to 1260C

 

Hello,

Take a look at this page:
http://www.lanzo.se/applications/thermocouple.html

The usefull range has to do with the accuracy over the range.

Bertus

 

Atmosphere compatability in part is important. There are three major types (J,K); (R,S) and T.

T is good for cryogenic work, but a diode sensor is the best. RTD's are great too, but with a limited range.

Platinum is an expensive metal.

For T, pure copper has issues with corrosion.

Where I worked we had to use C themocouples for copper because of the high temperatures.

Some of our readouts were limited to 200C or larger for K. It takes more work to linearize over a larger range.