NTC (negative temperature coefficient) thermistor is a kind of thermal semiconductor resistor, its resistance value decreases with the increase of temperature. The temperature coefficient of resistance is in the range of-2%/k ~-6%/k, which is about 10 times of the temperature coefficient of metal resistance. The change in the resistance value of the NTC thermistor may be caused by a change in the external ambient temperature, or may be caused by self-heating due to a current flowing therethrough. His various uses are based on this characteristic. The NTC thermistor is composed of a mixed oxide polycrystalline ceramic. 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, as well as various temperature measurement and temperature compensation occasions. Relying on its technical advantages in the field of thermistors, Huaju Electronics has produced temperature sensor products with stable performance and reasonable price. The products are widely used in military, medical, human life, industrial automation, automobiles, security fire, home appliances, communications and other areas and occasions that require temperature measurement or overheating protection. The ntc temperature sensor usually consists of 2 or 3 metal oxides, mixed in similar popular clays, and calcined into a dense sintered ceramic in a high-temperature furnace. Oxygen-bound metals tend to provide free electrons. Ceramics are generally excellent insulators. But only in theory, when the temperature is close to absolute zero, thermistor ceramics is the case. However, when the temperature increases to the more common range, the thermal excitation throws more and more free electrons. As many electron carriers pass through the ceramic, the effective resistance decreases. Resistance is extremely sensitive to temperature changes. A typical change is a decrease of (-)7[%] to 3[%] per degree Celsius. At this time, any sensor suitable for use in a wide temperature range is the most sensitive. The nominal room temperature resistance depends on the resistivity, size and geometry of the base material, as well as the contact area of the electrodes. Thick and narrow thermistors have a relatively high resistance, while thin and wide in shape have a lower resistance. The actual size is also very flexible, they can be as small. 010 inches or a very small diameter. There is almost no limit to the maximum size, but it is usually suitable for less than half an inch.

Structure of temperature sensor:

NTC thermistor, probe set (combined). A thermistor shell, extended lead, and sometimes a joint combination of the finished thermistor assembly (combination).

Structure

It is generally composed of NTC thermistor, probe (metal shell or plastic shell, etc., extension lead wire, and metal terminal or connector

. Principle

Using NTC thermistor in a certain measurement power, the resistance value decreases rapidly with the temperature rise. Using this feature, the NTC thermistor can determine the corresponding temperature by measuring its resistance value, so as to achieve the purpose of detecting and controlling the temperature.

Application of NTC Temperature Sensor in Automobile

The function of the temperature sensor is to measure the temperature of the engine's intake air, cooling water, fuel, etc., and convert the measurement result into an electrical signal and send it to the ECU. For all gasoline electronic control systems, intake air temperature and cooling water temperature are two temperature parameters necessary for ECU control, while other temperature parameters vary with the type of electronic control system and control needs.

The intake air temperature sensor is usually installed in the air flow meter or the intake duct or air flow meter from the air filter to the throttle body, and the water temperature sensor is arranged in the engine cooling water circuit, the cylinder head or the appropriate position on the body. Sensors that can be used to measure temperature include wound resistance type, diffusion resistance type, semiconductor transistor type, metal core type, thermocouple type and semiconductor thermistor type. Currently, they are used in intake air temperature and cooling water temperature measurement. The most widely used is the thermistor temperature sensor.

Huaju Electronics can customize various high-quality automotive temperature sensors according to the different needs and requirements of customers. The automotive temperature sensors produced by Huaju Electronics are mainly used in automotive air conditioners, engine oil temperature, automotive water temperature, and automotive seat temperature., Fuel temperature, evaporator fin temperature, exhaust pipe temperature, automobile motor temperature, electric vehicle power battery temperature, gearbox oil temperature, intake pipe temperature and other temperature detection,