Platinum rhodium thermocouple performance characteristic and the use of the note

Platinum rhodium thermocouple belongs to the more traditional temperature measuring element, due to its relatively stable in the performance of the thermoelectric, and antioxidant performance and stronger, so it is suitable for inert or oxidizing atmosphere continuous use, if it is a long-term use, should ensure that its temperature above 1600 ℃, and if short term use, then the temperature will also ensure above 1800 ℃.

and platinum-rhodium thermocouple can also be used as temperature measurement sensors, under normal circumstances, the more often and temperature transmitter, as well as the regulator between display instrument such as the use of form a complete set, and each composition control system, can be directly to 0 ℃ Steam, gas, and between 1800 ℃ medium such as the measurement and control.

use platinum rhodium thermocouple matters needing attention are the following:

a, choose platinum rhodium thermocouple compensation wire, for its choice in model is very important, especially since can not appear the phenomenon of wrong polarity, and the compensation of wire connection between the thermocouple and end, the temperature is not exceed 100 ℃;

2, if you are using on the time constant of larger platinum-rhodium thermocouple, at the same time for temperature control or temperature, on the display of instrument, although there will be a smaller temperature fluctuations, but actually the furnace temperature fluctuation is very big, the temperature is measured in order to more accurately, should choose the constant smaller platinum-rhodium thermocouple.

3, according to platinum rhodium thermocouple wiring diagram on the instrument, the equipment connection and electricity, the instrument is displayed on the thermocouple index number, followed by the full-scale range of the instrument, then according to the instrument of the digital tube display to set temperature, then the digital tube on top would be to measure the temperature display;

4, platinum rhodium thermocouple is not can be directly installed on the measured medium, or area of flow is less, if the measurement using platinum rhodium thermocouple tube to measure the temperature of the gas, must ensure that it is countercurrent to install, and maintain good contact between the gas.