Temperature instrument common faults and processing methods
Pt100 platinum thermal resistance, thermal resistor can be temperature measuring instruments which are frequently used in low temperature range, its use range is very wide, across the medical, electric meter, industrial production, temperature instruments and other high precision temperature. But so many within the scope of use, often happen some failures:
1, fault phenomenon: display instrument indicates a negative;
Possible reasons: the display instrument with pt100 resistance connection is wrong or pt100 hot resistance short-circuit phenomenon;
Processing method: correct wiring, or find out short circuit, reinforced insulation.
2, fault phenomenon: table indicating the pt100 resistance infinity;
Possible reasons: the pt100 resistance or lead wire short circuit or terminals to loosen, etc.;
Methods: the change in resistance or welding and tighten the screw connection, etc.
3, fault phenomenon: display the indicated value is lower than the actual value of the pt100 resistance or unstable value;
Possible reasons: protecting tube with metal scraps, dust, dirt and thermal resistance between terminal short circuit;
Methods: to remove scrap metal, cleaning dust, water, etc., find the short circuit point reinforced insulation.
4, failure phenomenon: PT100 thermoelectric resistance changes with the temperature relation;
Possible reasons: pt100 metamorphic thermal resistance wire material corrosion;
Deal with method: change of pt100 thermal resistance.