Temperature sensor is to use the material law of various physical properties with temperature changes the temperature sensor
is converted to electricity.
According to measuring methods can be divided into two types: contact and non-contact.
Contact temperature sensor temperature measurement is the basic principle of temperature measuring element to reach thermal equilibrium with the object being measured.
When measuring temperature, therefore, need to keep a certain time and to make both reach thermal equilibrium.
While keeping the length of time, with temperature measuring elements related to the thermal response time.
And thermal response time depends on the structure of the sensor and measurement conditions, the difference is great.
For the gas medium, especially the static gas, at least should be a balance of more than 30 minutes to reach;
For liquid, * will in more than five minutes fast.
To temperature changing were places, especially in an instant change process, the whole process of only 1 second, insist on the sensor response time in milliseconds.
Ordinary temperature sensor, therefore, not only to keep pace with the speed of change in the temperature of the object appear lags behind, and the measurement error due to reach thermal equilibrium.
* good choice fast response of the sensor.
Except for thermocouple protection tube, diameter of the measuring junction of the thermocouple, and the main factors that accidentally silk the thinner, measuring the diameter is smaller, the shorter its thermal response time.
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