Analysis of Thermal Resistance Sensors
Thermal Resistance Sensing Category:
1.NTC thermal resistance sensor:
The sensor is a negative temperature coefficient sensor,That is, the sensor resistance decreases with increasing temperature;
2.PTC thermal resistance sensor:
The sensor is a positive temperature coefficient sensor,That is, the sensor resistance increases with increasing temperature.
In the temperature detection accuracy requirements of relatively high occasions,This sensor is more applicable.At present, the more widely used thermal resistance materials are platinum, copper, nickel, etc.,They have a large temperature coefficient of resistance, good linearity, stable performance, the use of a wide temperature range,Easy processing and so on.Used to measure the temperature range of -200 ℃ ~ +500 ℃.
Delay characteristics of the sensor:
The hysteresis characterizes the extent to which the sensor outputs between the forward (input increase) and the reverse (input reduction) travel - an input characteristic curve is inconsistent,Usually with the maximum difference between these two curves △ MAX and full scale output F · S as a percentage,Hysteresis can be caused by the presence of energy in the sensor's internal components.
The main advantages of thermal resistance sensors:
1, high measurement accuracy; thermal resistance sensor has a higher measurement accuracy,Mainly some of the material resistance temperature characteristics of stability, good reproducibility.Secondly, compared with the thermocouple, it does not have a reference-side error problem.
2, there is a large measurement range, especially in the low temperature;
3, easy to use in automatic measurement and long distance measurement.