Infrared temperature sensor PT100 temperature satisfied the choice of the company

Temperature of the installation of the temperature sensor using the

the error of the insulation deterioration and introduced such as thermocouple insulation, protection tube 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 causes the thermoelectric potential loss but also can introduce interference, the resulting error sometimes can reach on baidu.

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the error of thermal inertia is introduced into because of thermocouple thermal inertia instrument indicated value behind the change of the measured temperature, temperature (temperature sensor Figure 12) This effect is particularly prominent in the fast measurement. So should be used as thermal electrode is small, small thermocouple protection tube diameter. Temperature measuring environmental permits, even protecting tube can be taken. Due to measurement lag, using thermocouples detect temperature fluctuations of the amplitude of the furnace temperature fluctuation amplitude of the small. Measurement lags behind, the greater the fluctuation amplitude of the thermocouple is smaller, and the actual temperature difference. When using the time constant of thermocouple temperature or temperature control, instrument display temperature fluctuation is small, but the actual furnace temperature fluctuations can be quite large. In order to accurately measure temperature, should choose small thermocouple time constant. With thermocouple time constant is inversely proportional to the heat transfer coefficient, heat the density and specific heat is proportional to the diameter, material, such as to reduce the time constant, in addition to the increased heat transfer coefficient, the effective way is to try to decrease the size of the hot end. Use, usually USES the material with good thermal conductivity, thin, small diameter of the tube wall to protect casing. In the precision of temperature measurement, using unprotected casing bare wire thermocouple, thermocouple easy damaged, should be timely correction and replacement.

temperature temperature sensor how to avoid the error of

the temperature temperature sensor in the installation and use, the need to avoid the occurrence of the following error, ensure better measuring result.

1, the introduction of improper installation error

such as the location of the thermocouple installation and insertion depth cannot reflect the reality of the furnace temperature, etc. , in other words, the thermocouple should not be in too close to the door and heating, the depth of the insert should be at least 8 ~ 10 times the diameter of the protecting tube.

2, thermal resistance error

at high temperature, such as protecting tube with a layer of ash, dust attached to the above, the thermal resistance increase, hinder the heat conduction, when the temperature is lower than the true value of measured temperature value. Therefore, we should maintain the cleanness of thermocouple protection tube outside, to reduce the error.