Isolation method

The isolation method is to suspend the thermocouple so that the thermocouple is not in contact with the refractory bricks of the furnace wall, and insulation is also used between the thermocouple and the bracket. This method can well prevent high temperature leakage interference.

2, shielding method

The shielding method is to shield the thermocouple's compensation wire in the iron pipe or other metal shield. This prevents electromagnetic interference and high-voltage electric field interference. When using this method, the iron pipe and the shield should be well grounded, and the compensation wire should be twisted.

3, grounding method

This method is to ground the measurement loop and introduce interference into the earth to ensure the instrument's measurement accuracy. This method has two forms: the first is the reference junction of the thermocouple, and the second is the grounding of the thermocouple measurement terminal.

When using the reference terminal grounding method, one end of the thermocouple (or compensating wire) output is grounded through a sufficiently large capacitance (the larger the capacitance is, the better the better is allowed). The measuring terminal grounding method is to connect the thermocouple measurement terminal to ground, that is, to draw a wire ground from the measuring end of the thermocouple. This method has a good preventive effect against high temperature leakage interference. Metal wires that are resistant to high temperatures and harmless to thermocouple electrodes should be used when selecting wires.

When we use thermocouples, we should be prepared to prevent interference. This will make our thermocouple measurements more accurate, making our work more convenient and effective.

Anti-interference application

First, avoid strong magnetic fields

Second, compensating wire plus shielding

Third, keep the distance between the power cable and the signal cable separately

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