Temperature measuring instruments commonly used in the temperature measuring element, the direct measurement of the temperature and the temperature signal is converted into a thermoelectric EMFs signal, through the electric instrument (two meters) into the temperature of the measured medium. Thermocouple installation methods are: the main fixed methods are threaded connections, flange connections and welding, the applicable occasions and requirements are different, mainly in accordance with the pressure, temperature and other parameters to set. So what should we pay attention to when installing and using? Today I will tell you one one.
1, we must pay attention to the use of the corresponding type of thermocouple wire, can not take the wrong polarity, temperature compensation and thermocouple wire connecting terminal can not exceed 100 DEG C.
2, when the time constant of thermocouple or temperature control, temperature display instrument although volatility is very small, but fluctuations in the actual temperature of the furnace can be very large. In order to measure the temperature accurately, should choose the time constant of thermocouple.
3, according to instrument wiring diagram for the correct wiring electricity, instrument first display instrument thermocouple indexing, went on to show the instrument range, measuring instrument under the row of digital tube display setting temperature, instrument row digital display temperature measurement.
4, can not flow in the installation area of thermocouple rarely measured medium, as measured by the thermocouple tube gas temperature, thermocouple must make against the direction of flow and full contact with the gas installation.
5 in order to measure the thermocouple and thermal resistance and the measured full heat exchange medium between the measuring point should be a reasonable choice, try to avoid the valve
6, on the basis of the intermediate conductor's law, in the actual application of thermocouple temperature measurement, often using hot end welding, cold end open, cold end through the connecting wire and the display instrument connected temperature measurement system.
