Views: 0 Author: Site Editor Publish Time: 2022-01-18 Origin: Site
The continuous progress of society and the increase of various machines and equipment have freed people from simple and repetitive tasks and promoted the development of social productive forces. The glass encapsulated NTC thermistor can help people detect the degree of temperature at work, can help people reasonably control the temperature range, and ensure a safe value.
What is the composition of a glass encapsulated NTC thermistor?
What should be paid attention to when choosing a glass encapsulated NTC thermistor?
What effect does the response time have on the glass encapsulated NTC thermistor?
Glass encapsulated NTC thermistor, this material is a semiconductor ceramic made of two or more metal oxides such as manganese, copper, silicon, cobalt, iron, nickel, and zinc. , Can be made into a thermistor with a temperature coefficient. The resistivity and material constant depend on the material composition ratio, the sintering atmosphere, the sintering temperature and the structural state.
The resistance value can be roughly expressed as RT and RT0 are the resistance values at temperatures T and T0, respectively, and Bn is the material constant. The resistivity of the material itself changes due to temperature changes, which are determined by the characteristics of the semiconductor.
1. Whether the temperature of the measured object needs to be recorded, alarmed, and automatically controlled, and whether it needs to be measured and transmitted remotely;
2. Size and Accuracy Requirements for Temperature Measurement Ranges
3. whether the size of the temperature sensing element is appropriate;
4. When the temperature of the target changes over time, whether the hysteresis of the temperature measuring element can meet the temperature measuring requirements;
The basic principle is that the temperature measuring element must reach thermal equilibrium with the measured object. Therefore, it is necessary to maintain a certain period during temperature measurement to achieve thermal equilibrium between the two. The length of the holding time depends on the thermal response time of the temperature measuring element. The thermal response time mainly depends on the resistance structure and measurement conditions, which vary greatly. For gaseous media, especially static gas, it should be kept for at least 30 minutes to reach equilibrium; for liquids, the fastest should be at least 5 minutes. For the place under test where the temperature is constantly changing, especially the momentary change process, the whole process is only 1 second, and the response time of the resistance is required to be in the millisecond level. Therefore, the ordinary resistance not only lags behind the temperature change speed of the measured object but also causes measurement errors due to the inability to reach the thermal balance. It is best to choose a resistor with a fast response.
The tremendous abundance of social production materials cannot be separated from the promotion of technology. New technologies can be applied in many industries. Thermistors continue to develop new types of resistors along with the technology. Among them, glass encapsulated NTC thermistors have high sensitivity for temperature detection, which can help people detect temperature and reduce people’s daily workload. . Our company has professional technical personnel and can provide you with customized products. If you are interested in this product and want to get more information, please click our company website: https://www.cnjept.com/.
