The thermocouple
Major differences among three types of conductors are as follow
Thermocouple Conductors
- These are called original conductors used to make thermocouple sensor.
- It has special limits of accuracy (Class 1)as per IEC 60584.3 that is 1 . 5 °C or 0 . 4 % of temperature.
- Temperature ranges of these conductors are maximum measuring range of thermocouple type.
- Costly as compared to Extensions & Compensating conductors.
- In flexible thermocouple wire & cables these conductor are used.
Extension Conductors
- Extension grades conductors have same conductor material as of thermocouple one but with lower accuracy.
- It has standard limits of accuracy (Class 2)as per IEC 60584.3 that is 2.5 °C up to 200 °C
- Temperature ranges of these conductors are maximum up to 200 °C
- Costly as compared to compensating but cheaper than thermocouple grades conductors.
- These conductors are used to make wires & cables, same cables are used to extend the thermocouple output mV signal to panel.
- Extension conductors not available with R/S/B type thermocouple
Compensating Conductors
- Compensating grades conductors are copper based material having similar
- characteristicsas of thermocouple over a very limited temperature range.
- It has standard limits of accuracy (Class 2)as per IEC 60584.3 that is 2.5 °C up to 100 °C only
- Temperature ranges of these conductors are up to 100 °C only.
- Cheapest among all
- hese conductors are used to make wires & cables, same cables are used to extend the thermocouple output mV signal to panel.
- Maxallowed Cable temperature range is up to 100 °C.
- Available in KCB & KCA (Ktype) RCA ® type), SCA (Stype ) , BC ( BType) thermocouple compensating conductors
