Temperature
measuring instruments can be divided into two types according to the temperature measurement method: contact type and non-contact type. Generally, contact temperature measurement
instruments temperature
meter is relatively simple, reliable, high
measurement accuracy;
However, since the temperature measuring element and the measured medium need to be fully heated, it takes a certain time to reach the heat balance, so there is a delay phenomenon of temperature measurement, and at the same time, it is limited by the high temperature resistant material, and cannot be applied to a very high temperature
measurement. .
Non-contact temperature measurement
instrument by principle of thermal radiation to
measure temperature, temperature measuring element without contact with the measured medium, a wide temperature range, the upper limit of the temperature is not limited, nor destruction temperature of the object field The reaction speed is generally faster;
However, due to the external factors such as the emissivity of the object, the
measurement distance, the smoke and the moisture, the
measurement error is large.
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