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102
Thermocouple Descriptions
C and D Type
Thermocouples
C (tungsten-5% rhenium versus
tungsten-26% rhenium)
D (tungsten-3% rhenium versus
tungsten-25% rhenium)
Publication 1746-UM614B-EN-P - September 2007
Types C and D thermocouples are recommended for use in the
temperature range from 0
inert atmospheres. They are not practical for use below 399 °C
(750 °F). Beware of embrittlement.
C and D Thermocouple Recommended Use
Code
Color Code
C
Jacket:
wht-red trace
+ = wht, - = red
D
Jacket:
wht-yel trace
+ = wht, - = red
2320 °C (32...4208 °F) in non-oxidizing
...
Max Useful Temp.
EMF Over
Range
Useful Range
TC grade:
0...37.066 mV
0...2320 °C
(32...4208 °F)
Ext grade:
0...870 °C)
(32...1600 °F)
TC grade:
0...39.506 mV
0...2320 °C
(32...4208 °F)
Ext grade:
0...260 °C (32...500 °F)
Std. Limits
of Error
4.5...450 °C
(40.1...842 °F)
1.0% to
2320 °C
(4208 °F)
4.5...450 °C
(40.1...842 °F)
1.0% to
2320 °C
(4208 °F)
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