Introduction to CWF type NTC temperature sensor:

Introduction to CWF type NTC temperature sensor: NTC (negative temperature coefficient) thermistor is a heat-sensitive semiconductor resistor. Its resistance value decreases as the temperature increases, and the resistance temperature coefficient is -2%/k~-6%/ Within the k range, it is approximately 10 times the temperature coefficient of metal resistance. Changes in the resistance value of the NTC thermistor can be caused by changes in the external ambient temperature, or can be caused by self-heating due to the flow of current. 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. Huaju Electronics 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. They are also widely used in various temperature measurement and temperature compensation occasions. Relying on its technical advantages in the field of thermistors, Huaju Electronics produces temperature sensor products with stable performance and reasonable prices. The products are widely used in military, medical, human life, industrial automation, automobiles, security and fire protection, home appliances, communications, etc. 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.

Temperature sensor structure:

NTC thermistor, probe assembly (combination). A finished thermistor assembly (combination) composed of a thermistor shell, extension lead, and sometimes a connector.

structure

Generally composed of NTC thermistor, probe (metal shell or plastic shell, etc.), extension lead, and metal terminal or connector

.principle

Using NTC thermistor, under a certain measurement power, the resistance value decreases rapidly as the temperature rises. Utilizing 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.

application

● On air conditioners, refrigerators, freezers, water heaters, water dispensers, heaters, dishwashers, disinfection cabinets, washing machines, dryers and other home appliances.

● Automotive air conditioners, water temperature sensors, intake air temperature sensors, engines

● Switching power supply, UPS uninterruptible power supply, frequency converter, electric boiler, etc.

● Smart toilets, electric blankets, etc.

Features:

● High sensitivity and fast response speed

● Resistance and B values ​​have high precision and good consistency and interchangeability

● Adopting double-layer encapsulation process, it has good insulation and sealing properties and resistance to mechanical collision and bending.

● The structure is simple and flexible, and can be customized according to different design requirements of customers.