Thermal resistance fault causes and treatment methods

Thermal resistance of common fault is the thermal resistance of short circuit and open circuit. General circuit is the more common form, this is because the heat resistance wire is fine. Open circuit and short circuit is easy to determine, multimeter 'x 1 Ω' files are available, such as the measured value is less than R0, may have a short circuit; If the multimeter instructions to infinity, then the resistance can be decided to break.

in resistance short-circuit generally easier to deal with, as long as it doesn't affect the length of the wire resistance and the thickness, short circuit for dry, reinforced insulation.

in resistance circuit repair is bound to change the length of the wire resistance and impact resistance, resistance to replace the new body is good, if the repair welding, after welding to be calibrated before use. In the operation of the thermal resistance temperature measurement system in common faults and processing methods are as follows:.

fault phenomenon

may cause

method

display instrument indicated value is lower than the actual value or unstable value for the

protection tube with metal scraps, dust, dirt and thermal resistance between terminal short circuit ( Drops of water, etc. )

除去金属，清扫灰尘、水滴等，找到短路点，加强绝缘等

显示仪表批示无穷大

热电阻或引出线断路及接线端子松开等

更换电阻体，或焊接及拧紧线螺丝等

阻值与温度关系有变化

热电阻丝材料受腐蚀变质

更换电阻体（ Thermal resistance)

display instrument indicates a negative

display instrument and thermal resistance connection is wrong, or thermal resistance short-circuit phenomenon has

correct wiring, or find out short circuit, reinforced insulation