Temperature transmitter installation error hazard

Temperature transmitter will appear some adverse reactions during installation, not only when the installation occurs, there will be various problems in the use of the process, then how to properly install the temperature transmitter, integrated temperature change What happens when the transmitter is installed incorrectly?

The relevant personage says, when installing the integrated temperature transmitter, the insulation becomes worse and the introduced error is insulated by the thermocouple. The excessive protection of the thermocouple electrode and the wall of the furnace due to the excessive dirt and salt residue of the protection tube and the wire drawing board. It is more severe at high temperatures, which not only causes the loss of thermoelectric power but also introduces interference, and the error caused by such problems can sometimes reach Baidu.

Integral temperature transmitter error introduced by thermal inertia

When the thermal inertia of the thermocouple causes the indicator value of the instrument to lag behind the change in the measured temperature, this effect is particularly prominent when making rapid measurements. Therefore, a thermocouple with a thinner thermoelectrode and a smaller diameter of the protective tube should be used as much as possible.

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 thermocouple is smaller than the oscillation amplitude of the furnace temperature.

Generally, 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 proportional to the diameter of the hot end of the thermocouple, the density of the material, and the specific heat. To reduce the time constant, In addition to increasing the heat transfer coefficient, the most effective way is to minimize the size of the hot end.

Therefore, when we use an integrated temperature transmitter, we usually use materials with good thermal conductivity. We have a protective sleeve with a thin wall and a small internal diameter. In a more accurate temperature measurement, use a bare wire thermocouple without a protective sleeve. However, thermocouples are easily damaged and should be promptly corrected and replaced.

The correct installation of the temperature transmitter can effectively ensure the normal use of the integrated temperature transmitter. Therefore, when an error occurs during installation, it should be adjusted in time to avoid affecting the normal use.