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Temperature Sensor

The working principle of the temperature sensor: a sensor that can sense the temperature and convert it into a usable output signal. As the temperature changes, the resistance of the metal changes. For different metals, the resistance changes every time the temperature changes by one degree. The temperature sensor is the core part of the temperature measuring instrument and has many varieties. According to the measurement method, it can be divided into two types: contact and non-contact. According to the characteristics of the sensor material and electronic components, it can be divided into two types: thermal resistance and thermocouple. 

Platinum Resistance

Platinum resistance is abbreviated as: platinum thermal resistance, its resistance value will change with temperature change. It has PT100 and PT1000 series products. 100 after PT means that its resistance is 100 ohms at 0 ° C, and its resistance is about 138.5 ohms at 100 ° C. Principle: When PT100 has a resistance of 100 ohms at 0 degrees Celsius, its resistance will increase at a constant rate as the temperature increases. 


Working principle: pt100 is platinum thermal resistance, and its resistance value will change with temperature. 100 after PT means that its resistance is 100 ohms at 0 ° C, and its resistance is about 138.5 ohms at 100 ° C. When the PT100 is at 100 ohms, its resistance value is 100 ohms, and its resistance value will increase approximately uniformly with temperature.


PT1000 is a platinum thermal resistor, and its resistance value will change with temperature. 1000 after PT means that it has a resistance of 1000 ohms at 0 ° C and a resistance of about 2120.515 ohms at 300 ° C. Its working principle: When the PT1000 is at 0 degrees Celsius, its resistance is 1000 ohms, and its resistance changes linearly with temperature. 

Thermal Resistance

The working principle of thermal resistance temperature measurement is to measure the temperature and temperature-related parameters based on the characteristic that the resistance value of the conductor or semiconductor changes with temperature. Thermal resistance characteristics: 1. Compression spring-type temperature sensing element with good anti-vibration performance; 2. High temperature measurement accuracy; 3. High mechanical strength and high temperature and pressure resistance performance; 4. Imported film resistance element with reliable and stable performance 


Working principle: The basic principle of thermocouple temperature measurement is a closed loop composed of two different material material conductors. When there is a temperature gradient at both ends, a current will flow through the loop. At this time, there is an electromotive force between the two ends-heat Electromotive force, thermoelectromotive force is composed of two parts of electromotive force, one is the contact electromotive force of two conductors, and the other is the temperature difference electromotive force of a single conductor.



Working principle: The thermistor will be inactive for a long time; when the ambient temperature and current are in the c area, the thermistor's heat dissipation power is close to the heating power, so it may or may not be activated. When the thermistor is at the same ambient temperature, the operating time decreases sharply as the current increases; the thermistor has a shorter operating time and a smaller sustaining current and operating current when the ambient temperature is relatively high.

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