The method of thermocouple tamper-proof what

Using thermocouple is need to be anti interference measures, so as to improve the measurement accuracy of the thermocouple, the basic method is to avoid the magnetic field, compensation conductor should be shielded and power cable and signal wiring distance apart. Specific methods are as follows:

1, shielding

shielding method is the compensation of the thermocouple wire, wear in iron pipe or other metal shield to shield. This will prevent electromagnetic interference and the interference of high voltage electric field. When using this method should be iron pipe, conduct a good grounding and shielding, and the compensation conductor should be ground up.

2, isolation method

the isolation method is install the thermocouple hung up, make the thermocouple is not contact with the furnace wall brick, also USES insulation between thermocouple and stents in isolation. This method is a good way to prevent heat leakage interference.

3, grounding method this method is to measure ground loop, and the interference is introduced into the earth so as to ensure the measurement accuracy of instrument. This method has two forms of farming: the first is the thermocouple reference end grounding, the second is thermocouple measuring the grounding.

the reference side grounding method, is the thermocouple ( Or compensation conductor) The output end, through a large enough grounding capacitance ( The greater the capacitance when conditions permit, the better) 。 Measuring the grounding method is the thermocouple measuring side, is from the thermocouple measurements end a grounding wire. This method is to heat leakage interference has a good preventive effect. When choosing the wire should be use high temperature resistant and harmless to the thermocouple electrode wire.

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