Common faults in the use of Pt100 thermal resistors

First, the fault phenomenon: the display meter indicates a negative value;

Possible cause: The display instrument is wrong with the pt100 thermal resistance wiring or the pt100 thermal resistance has a short circuit;

Treatment: Correct the wiring, or find the short circuit and strengthen the insulation.

Second, the failure phenomenon: the table of pt100 thermal resistance indicates infinity;

Possible causes: pt100 thermal resistance or lead wire short circuit or loose terminal block;

Treatment method: replace the resistor body or weld and tighten the terminal screws.

Third, the fault phenomenon: the indication value of the pt100 thermal resistance is lower than the actual value or the indication value is unstable;

Possible causes: metal chips, dust, dirt between the terminals and short circuit of the thermal resistance in the protection tube;

Treatment method: remove metal shavings, clean dust, water droplets, etc., find the short-circuit point to strengthen the insulation.

IV Symptom: PT100 thermal resistance value varies with temperature relationship;

Possible cause: corrosion and deterioration of silk material;

How to deal with it: Replace the pt100 thermal resistor .