Field use platinum rhodium thermocouple should pay attention to what matters

Platinum rhodium thermocouple in temperature measuring instrument, belonging to the more common a measuring element, can be directly to temperature measurement, and the temperature of the measured signal directly into a thermoelectric emf signal, again through the electric meter convert them to need to be measured temperature. Platinum-rhodium thermal resistance on the installation way is also different, more common are fixed, you need to use the threaded connection, then using the flange connections and welding, but using occasions and requirements are different, the main can be determine according to the parameters of temperature and pressure, etc. One, when we were in the use of platinum-rhodium thermocouple, the first thing to note is that the compensation of the wires on the model matching, the wrong polarity may not happen, and compensation conductor and platinum rhodium thermocouple temperature on the connection between the end can not exceed one hundred degrees Celsius. Second, if the use of platinum-rhodium thermocouple time is long, although on the instrument display will appear smaller fluctuations in temperature, but in fact and furnace temperature fluctuations is bigger, so in order to ensure the measuring temperature accurately, we should choose in relatively small platinum-rhodium thermocouple time constant. Three, in order to ensure that platinum rhodium thermocouple and thermal resistance between the measurement of the medium, can undertake more sufficient heat exchange, when selecting a location of measuring points must be reasonable, the position of the valve can be avoided.