About how to choose the temperature sensor
to reliable temperature measurement, first you need to choose the right temperature meter, temperature sensor.
The thermocouple, thermal resistance, platinum resistance (
And temperature * IC are tests commonly used temperature sensor.
Below is for the characteristics of the thermocouple and thermistor temperature instrument is introduced.
1, thermocouple, thermocouple temperature sensor is commonly used in * temperature measurement.
Its main advantage is wide temperature range and adapt to the atmospheric environment, and strong, low price, no need power supply, and cheap.
Thermocouples are connected by a at one end of the two different metal wires (
Metal and metal B)
, when the thermocouple end when heated, thermocouple circuit there is a potential difference.
Available to measure the electric potential difference to calculate temperature.
However, is a nonlinear relationship between voltage and temperature, the temperature due to voltage and temperature is nonlinear relationship, so need to reference temperature (
Make a second measurement, and use the test equipment (software or hardware processing voltage within an instrument -
Temperature transformation to * get thermocouple temperature (
Agilent34970A and 34980 a data collector has a built-in measuring the computing power.
In short, the temperature of the thermocouple is simple * and * general sensors, but the thermocouple is not suitable for the measurement and application of high precision.
2, thermistor thermistor is to use semiconductor material, most of the negative temperature coefficient of resistance decreased with increasing temperature.
Temperature changes can cause greater resistance to change, so it is * sensitive temperature sensor.
But the poor linearity thermistor, and had a lot to do with production process.
Manufacturers to a standardized thermistor curve.
Thermistor volume is very small, respond to changes in temperature.
But the thermistor need to use a current source, small size also makes it to the thermal error is very sensitive.
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