Difference between thermistor and thermocouple
ThermocoupleThe thermocouple is a sensor consisting of two conductors that are different in properties and are welded together. The measurement is due to the formation of a thermal electromotive force (voltage) formed between the conductors. Depending on the cold or hot source, the current on the sensor will change its direction between a positive or negative value. The sensor does not require special settings, you just need to check the readings with the reference device.
- in industry (metal products);
- in automated control systems (CNC machines).
ThermistorThermistor is a semiconductor device operating on the principle of variable resistance.
- NTC thermistor (resistance decreases with increasing temperature)
- PTC thermistor (resistance increases with temperature) li>
- as the temperature rises, the lifetime is reduced.The manufacturer gives a guarantee of up to 1000 hours;
- for an accurate reading, calibration with a reference meter is required.
Summing upThe accuracy of temperature readings is certainly higher in thermistor sensors, but thermocouples can boast a large measuring range. The material from which the thermistor is made degrades over time, whereas thermocouples live much longer. Methods for determining the temperature of the sensors differ. For each type, you need your own device or controller that allows you to control the readings. The main selection criterion can be considered the measuring range. If the temperature exceeds the threshold of 300 degrees, a thermocouple should be used. Otherwise, it makes no sense to overpay, you can get by with inexpensive thermal resistances, since the thermocouple is much more expensive.
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