The platinum rhodium thermocouple thermoelectric potential is smaller than the actual value. What should I do?

Under normal circumstances, with the increase of measuring the temperature, platinum, rhodium thermocouple thermoelectric emf will also increase, thermoelectric emfs mainly depends on the size of the platinum rhodium thermocouple temperature difference on both ends of the conductor material and, not affected by hot electrode length and diameter. In the process of production, people can use it to measure liquid within certain temperature range, the temperature of the steam and gas medium and solid surface.

by comparison, in practice, platinum, rhodium thermocouple assembly not only simple, but also has good performance, now are used in many fields. But also may appear some problems during use, such as its small thermoelectric potential than the actual value. So, why is this case?

after analysis, the main reasons may include are: 1, short-circuit; Short circuit between 2, terminal box terminal; 3, compensation wire short circuit because of insulation burn out; 4, compensation conductor and platinum-rhodium thermocouple does not match; 5, compensation conductor and thermocouple polarity reverse; 6, insert depth and the installation location is wrong; 7, thermocouple cold junction temperature is too high.

according to the problems listed above, the corresponding solution measures are: 1, on checking if it is caused by moisture, drying; If the insulation fault of the porcelain tube, it should be replaced. 2, open the platinum-rhodium thermocouple junction box, the wire brush clean; 3, the short circuit insulation or replace a new compensation conductor; 4, change into compensation conductor should be of the same type.

5, if the detection is due compensation conductor and platinum rhodium thermocouple reverse polarity, should reconnect; 6, change the installation location and insert depth; 7, platinum rhodium thermocouple wires for compensation wire, turn away the cold end of drier.