NTC (negative temperature coefficient) thermistor is a heat-sensitive semiconductor resistor. Its resistance value decreases as the temperature increases. The temperature coefficient of resistance is in the range of -2%/k~-6%/k, which is about that of metal. 10 times the temperature coefficient of resistance. The change in the resistance value of the NTC thermistor can be caused by changes in the external ambient temperature, or it can be caused by the flow of current and self-heating. His various uses are based on this property. NTC thermistors are constructed from polycrystalline ceramics with mixed oxides. The conductive mechanism of this material is quite complex. It is an early professional manufacturer of NTC thermistors in China. The NTC thermistors produced by the company are widely used in various handheld devices and miniaturized electronic equipment, and are also widely used in various Various temperature measurement and temperature compensation occasions, relying on the technical advantages in the field of thermistors, produce temperature sensor products with stable performance and reasonable price. The products are widely used in military, medical, human life, industrial automation, automobiles, security and fire protection, and home appliances. , communications and other fields and occasions that require temperature measurement or overheating protection. NTC temperature sensors are usually composed of 2 or 3 metal oxides, mixed in a popular clay, and sintered into a dense sintered ceramic in a high-temperature furnace. Oxygen-bonded metals tend to donate free electrons. Ceramics are generally excellent insulators. But this is only theoretically the case with thermistor-type ceramics when the temperature is close to absolute zero. However, as the temperature increases to more common ranges, thermal excitations throw out more and more free electrons. As many electrons carry current through the ceramic, the effective resistance decreases. Resistance changes extremely sensitively with temperature. Typical changes are (-)7[%] to 3[%] reduction per degree Celsius. This is the most sensitive of any sensor suitable for use over a wide temperature range. The rated room temperature resistance depends on the resistivity, size and geometry of the base material, and the contact area of the electrodes. A thermistor that is thick and narrow has a relatively high resistance, while a thermistor that is thin and wide has a lower resistance. Actual sizes are also very flexible, they can be as small as .010 inches or very small in diameter. There is almost no limit to the maximum size, but half an inch or less usually applies. The structure of the temperature sensor: NTC thermistor, probe assembly (combination). A finished thermistor assembly (combination) composed of a thermistor shell, extension lead, and sometimes a joint. The structure generally consists of an NTC thermistor, a probe (metal shell or plastic shell, etc.), an extension lead, and a metal terminal or connector. The principle is that under a certain measurement power, the resistance value of the NTC thermistor increases rapidly as the temperature rises. Decrease. Using this characteristic, the NTC thermistor can be used to determine the corresponding temperature by measuring its resistance value, thereby achieving the purpose of detecting and controlling temperature. Applications ● Air conditioners, refrigerators, freezers, water heaters, water dispensers, heaters, and washing machines. Dish machines, disinfection cabinets, washing machines, dryers and other home appliances. ● Car air conditioners, water temperature sensors, air intake temperature sensors, engines ● Switching power supplies, UPS uninterruptible power supplies, inverters, electricity
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