The impact and consequences of incorrect installation of platinum and rhodium thermocouples

There will be some adverse reactions during installation, not only during installation, but also various problems during use. Then how to install it correctly? What will happen if the integrated temperature transmitter is installed incorrectly What's the situation? 　　Relevant people said that when the integrated temperature transmitter is installed, the insulation is deteriorated and the error is introduced, such as the insulation. The protection tube and the cable plate are too dirty or salt slag, resulting in poor insulation between the poles and the furnace wall. It is more serious at high temperature, which will not only cause the loss of platinum and rhodium thermocouple' target='_blank'>thermocouples but also introduce interference, and the error caused by such problems can sometimes reach Baidu. The error introduced by the thermal inertia of the integrated temperature transmitter. When the thermal inertia of the platinum-rhodium thermocouple causes the indicator value of the meter to lag behind the change of the measured temperature, this effect is particularly prominent during rapid measurement. Therefore, a hot electrode should be used as much as possible Thinner platinum rhodium thermocouple with smaller protective tube diameter.　　 When the temperature measurement environment permits, the protection tube can even be removed. Due to the measurement lag, the amplitude of the temperature fluctuation detected by the platinum-rhodium thermocouple is smaller than the amplitude of the furnace temperature fluctuation. Generally, in order to accurately measure the temperature, we should choose a platinum-rhodium thermocouple with a small time constant. The time constant is inversely proportional to the heat transfer coefficient, and proportional to the diameter of the hot end of the platinum-rhodium thermocouple, the density of the material, and the specific heat. Small time constant, in addition to increasing the heat transfer coefficient, a very effective way is to minimize the size of the hot end. Therefore, when we use an integrated temperature transmitter, we usually use a material with good thermal conductivity, a protective tube with a thin tube wall and a small inner diameter. For more precise temperature measurement, use bare-wire platinum rhodium without a protective tube Thermocouples, but platinum-rhodium thermocouples are easily damaged, so they should be corrected and replaced in time.　　 The correct installation of the temperature transmitter can effectively ensure the normal use of the integrated temperature transmitter. Therefore, if there is an error during the installation, it should be adjusted in time to avoid affecting the normal use.

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