1. The design and manufacturing principle of platinum resistance temperature sensors utilizes the physical phenomenon that the resistance of a platinum wire changes with temperature. The resistance value R at 0°C is available in 10Ω and 100Ω. Platinum resistance temperature sensors can monitor temperature changes from -200°C to 850°C. Taking the PT100 platinum resistance temperature sensor as an example, this will be more clear. This type of temperature sensor mainly comes in four models: armored, assembled, plug-in, and end-face resistance. The measurement temperature range is: -200°C to 150°C and -50°C to 850°C. PT100 platinum resistance temperature sensors are primarily used in applications requiring minimal temperature error and high accuracy.
2. Thermocouple temperature sensors are made of metal. They are typically welded together using two metal materials. When the main temperature changes, different potentials are generated at their ends, and the corresponding temperature change is detected by the change in potential. Features of thermocouple temperature sensors include: using a K positive electrode; maintaining accurate measurement accuracy at high temperatures; and being able to detect temperatures up to 2300°C.
3. Thermistor temperature sensors differ significantly from the previous two types of temperature sensors. Their primary raw material is metal oxide ceramic, which gives them advantages such as high sensitivity, low cost, and precise measurement. They have a narrow measurement range of -50°C to 200°C, are compact, and have a fast response time. Most importantly, due to their significant price advantage, they are widely used in home appliances.