Introduction to the two most commonly used temperature sensors in the test chamber industry
If you want to make reliable temperature measurements, you first need to choose the right temperature meter, which is the temperature sensor. Among them, thermocouples and thermistors are the most commonly used temperature sensors in high and low temperature tests. The following is a description of the characteristics of two temperature meters for thermocouples and thermistors.
First, thermocouple
Thermocouples are the most commonly used temperature sensors for temperature measurement. Its main benefits are its wide temperature range and adaptability to a variety of atmospheric conditions, and its robustness, low price, no power supply, and the cheapest. A thermocouple consists of two different metal wires (metal A and metal B) connected at one end. When one end of the thermocouple is heated, there is a potential difference in the thermocouple circuit. The measured potential difference can be used to calculate the temperature.
In short, thermocouples are the simplest and most versatile temperature sensor. At present, the temperature series in the ring test industry includes high and low temperature test chambers, constant temperature and humidity test chambers, high and low temperature alternating heat and humidity test chambers, etc. Most of the temperature sensors use thermocouple sensors, not only because of its high measurement accuracy and wide measurement range. Also because of its simple construction, it is very convenient to use.
Second, thermistor
Thermistors are made of semiconductor materials, mostly with a negative temperature coefficient, ie the resistance decreases with increasing temperature. Temperature changes cause large resistance changes, so it is the most sensitive temperature sensor. However, the linearity of the thermistor is extremely poor and has a lot to do with the production process. Manufacturers cannot give standardized thermistor curves. The thermistor measures absolute temperature on two lines and has good accuracy, but it is more expensive than the thermocouple, and the measurable temperature range is also smaller than the thermocouple. Since the thermistor is a resistive device, any current source will generate heat due to its power. The power is equal to the product of the square of the current and the resistance. Therefore use a small current source. If the thermistor is exposed to high heat, it will cause permanent damage.
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