Introduction to the Performance of NTC Temperature Sensors.Ultrasonic module

　　NTC temperature sensors are usually composed of 2 or 3 types of metal oxides, mixed in a fluid like clay, and forged into dense sintered ceramics in a high-temperature furnace. Oxygen linked metals often provide free electrons. Ceramics are usually excellent insulators. But only in theory, when the temperature is close to Absolute zero, this is the case for thermistor ceramics. However, as the temperature increases to a more common range, thermal excitation will throw out more and more free electrons. As many electrons carry current through the ceramic, the effective resistance decreases. The resistance is extremely sensitive to changes in temperature. The typical change is a decrease of (-) 7 [%] to 3 [%] per degree Celsius. At this point, any sensor suitable for use within a wide temperature range is the most sensitive.

　　The rated room temperature resistance depends on the resistivity, size, and geometric shape of the basic material, as well as the contact area of the electrodes. Thick and narrow thermistors have relatively high resistance, while those with thin and wide shapes have lower resistance. The actual dimensions are also very flexible, and they can be as small as. 010 inches or very small diameters. There is almost no limit to the maximum size, but it is usually suitable for sizes below half an inch.

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