The surface temperature measuring thermocouple in detail

Surface temperature measuring thermocouple has a surface temperature of copper resistance ( YY - T) And the surface temperature platinum thermal resistance ( YY - WZP - 装PT100) The points. Warm surface measured by special processing wire resistance element ( Copper or platinum wire) Winding, they are tight in the thermometer front and compared with general axial thermal resistance, surface temperature resistance measurement can be more correctly and quickly reflect the actual temperature condition of the surface being measured, the method of making it a lot, varieties of forms, suitable for power plant steam turbine and motor bearing shell or other body surface temperature measurement. Some surface heat resistance when installation because it fuses with the resistance element is connected, so will lead to surface heat resistance synchronous rotation, such ability make sure the surface thermal resistance in the installation is not artificial damage, but the actual installation process to avoid appear this kind of circumstance. Due to the emergence of this situation, strengthen scientific research developed special surface heat resistance, the surface heat resistance outside the installation time only need to twist the screw is ok, don't need to lead and surface heat resistance synchronous rotation.

surface thermocouple use notice:

1. When the surface thermocouple two surface thermocouple wire material component is determined, the size of the surface thermocouple thermoelectric potential, only related with the thermocouple temperature difference; If the thermocouple cold end temperature keeping, this into the thermocouple thermoelectric potential is only the end of the single value function of temperature. Two different welding material A conductor or semi-conductor A and B, form A closed loop, as shown. When the conductor A and B two persistent point temperature difference between 1 and 2, occurs between the electromotive force, thus forming the size of A current in the circuit, this kind of phenomenon called the thermoelectric effect. The surface of the thermocouple is in using this effect to work.

2. Surface thermocouple thermoelectric potential in the thermocouple temperature on both ends of the work of the function is poor, rather than the surface temperature measuring thermocouple cold end with the job, temperature difference on both ends of the function;

3. Surface thermocouple thermoelectric potential produced by size, when the surface thermocouple material is uniform, has nothing to do with the length and diameter of the surface thermocouple, only with surface thermocouple at both ends of the composition of the material and temperature difference;

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key words: thermal resistance, thermocouple, thermal resistance, platinum resistance, PT100, PT1000, pressure thermocouple sensor, digital temperature thermocouple sensor