Resistance furnace thermocouples shall be chosen to meet their requirements, its sub-national standards should be consistent with the corresponding provisions of the thermocouple protection tube should have the right to prevent the furnace thermocouple wire by the impact of media. Unless otherwise specified or required, industrial resistance furnace thermocouple wire length should not be less than 7.5m.
Thermocouple wire thermocouple material should be the same as, or use the thermoelectric properties of thermocouple wire the same compensation wires.
2 Temperature instrument is equipped with:
Resistance furnace temperature control area should be equipped with every indication, control, and if necessary, record the temperature of the furnace temperature meter. Temperature should be marked on the meter has been equipped with a thermocouple indexing. Except for minor adjustments, thermocouple or compensating lead wire length should not affect the accuracy of the instrument.
3 Temperature instrument types and their accuracy:
According to the technical level of resistance furnace is equipped with temperature meter divided into the following three categories:
C-level resistance furnace should be equipped with an accuracy of 0.25 or better instruments, instrument should have the thermocouple reference junction temperature is automatically compensated.
Class B or Class A resistance furnace should be equipped with an accuracy of 0.5 or better instrument.
When otherwise specified or required time (see section 9.2), A-level resistance furnace can also be equipped with an accuracy of one meter.
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