English
русскийTemperature sensors are a common feature in a variety of devices that help monitor operating temperatures in electrical circuits. They are useful functions in applications related to chemical handling, medical equipment, food processing units, and environmental control of air conditioning systems. The most well-known device is the thermometer, which can be used to quickly measure the temperature of liquids to solids.
Here are the four most popular types of temperature sensors:
Thermocouple
Thermocouple sensors are the most popular method of temperature measurement. It has several advantages, such as self-powered, low cost and extremely robust. This type of sensor works by measuring the change in voltage and works according to the principle of the thermoelectric effect. It is usually protected by a metal or ceramic shield to improve its functionality in harsh environments.
Resistance temperature detector
Resistance temperature detectors (RTDs) provide the most accurate data. The actual sensor is made of several wear resistant materials such as copper, nickel and platinum. This allows it to operate over a wide temperature range from -270°C to +850°C. Additionally, this type of sensor must be combined with an external current to perform at its best.
Thermistor
Thermistors are another easy-to-use, versatile, and relatively inexpensive sensor. It has the ability to adjust resistance when temperature changes are detected. The temperature sensor is made of ceramic materials such as nickel and manganese, which can put them at risk of damage. A useful feature is the ability to have higher sensitivity compared to RTDs.
thermometer
Thermometers are a practical choice for measuring the temperature of gases, liquids or solids. It contains alcohol or mercury liquid in a glass tube, and when the temperature starts to rise, the volume of the glass tube starts to increase. The glass tube holding the liquid is marked with a calibration scale to clearly show the rise or fall in temperature. Additionally, temperatures are easily recorded on multiple scales, including Celsius, Kelvin, and Fahrenheit.
Overall, there are several different types of temperature sensors on the market. The correct sensor must be used to match the application, as the accuracy will vary with different choices. Improperly selected sensors can cause equipment to malfunction as temperatures are allowed to rise without providing proper warnings.
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