The influence and consequence of wrong installation of thermocouple

Temperature transmitter will present some adverse reactions in the device, not only at the time of the device, but also in the process of use, there will be a variety of problems, so how to correctly install the temperature transmitter, integrated temperature transmitter device is not correct

What's going on?

Relevant personage says, when the device integrated temperature transmitter, insulation deterioration and the introduction of errors, such as thermocouple insulation, maintenance of pipe and anchor plate too much dirt or salt slag between the thermocouple interelectrode and wall insulation fault, at high temperatures is more serious, which not only cause the wastage of the thermocouple and the introduction of trouble, and errors caused by such problems sometimes can reach on baidu.

Errors in thermal inertia introduction of integrated temperature transmitters

When the thermal inertia of the thermocouple makes the indicating value of the surface lag behind the change of the measured temperature, this effect is particularly prominent in the rapid measurement, so the thermocouple with thinner thermal electrode and smaller maintenance tube diameter should be selected as far as possible.

When the temperature measurement environment is allowed, and even the maintenance tube can be taken, because there is a measurement lag, the amplitude of the temperature shaking with thermocouple detection is smaller than the amplitude of the furnace temperature shaking.

Usually, in order to accurately measure the temperature, we should choose a thermocouple with a small time constant. The time constant is inversely proportional to the heat transfer coefficient, and is directly proportional to the diameter of the hot end of the thermocouple, the density of the data and the specific heat. If you want to reduce the time constant, in addition to increasing the heat transfer coefficient, a useful way is to minimize the size of the hot end.

Therefore, when we use the integrated temperature transmitter, we usually choose the maintenance casing with good thermal conductivity, thin tube wall and small inner diameter. In the fine temperature measurement, we use the bare wire thermocouple without maintenance casing, but the thermocouple is easy to damage, so it should be corrected and replaced in time.

The correct device of the temperature transmitter can be useful to ensure the normal use of the integrated temperature transmitter, therefore, the device presents a fault, should be adjusted in time to avoid affecting the normal use