Selected by resistance furnace thermocouple should meet its requirements, the indexing should be consistent with the provisions of the relevant national standards, have appropriate protection tube thermocouple, thermocouple wire in order to avoid the impact of media by the furnace. Unless otherwise specified or required (see section 9.2), the length of the industrial resistance furnace thermocouple leads should not be less at 7.5m. The material of the thermocouple leads should be the same as the thermocouple, or use the thermoelectric properties of the thermocouple wire compensation wire.
Two temperature instruments with:
Resistance furnace temperature control area shall be provided with instructions, control and record the temperature of the furnace temperature necessary instrumentation. Temperature meter shall be marked on the indexing number has been equipped with a thermocouple. In addition to making minor adjustments, the thermocouple lead wire or the compensation wire length should not affect the accuracy of the instrument.
3 temperature meter types and their accuracy:
The technical level of resistance furnace with temperature meter divided into the following three categories:
C-level resistance furnace should be equipped with an accuracy of 0.25 or better instrument, the instrument should have automatic compensation of the thermocouple reference junction temperature.
Class B or Class A resistance furnace should be equipped with an accuracy of 0.5 or better instrument.
When otherwise required or demanded (see section 9.2), A-level resistance furnace can also be equipped with an accuracy of one meter.
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