Principle and application of temperature sensor, four types and principles of temperature sensor

Pressure sensor is a common sensor in industrial practice, and has a wide range of applications in various industrial automation environments, such as water conservancy and hydropower, railway transportation, aerospace and other fields. Pressure sensors are used in different locations and have different performance metrics. Therefore, when selecting a pressure sensor, it is necessary to understand the performance indicators and application scope of the sensor.

Below, I will introduce to you the performance index parameters of the pressure sensor. Rated pressure range The rated pressure range is the pressure range that meets the specified values of the standard. That is, between high and low temperatures, the sensor outputs a pressure range that conforms to the specified operating characteristics.

In practice, the pressure measured by the sensor is within this range. Maximum Pressure Range The maximum pressure range is the maximum pressure that the sensor can withstand for a long time.

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A temperature sensor is a sensor that senses temperature and converts it into an output signal. Temperature sensors are the core components of temperature measuring instruments, and there are many types. According to the measurement method, it can be divided into two categories: contact temperature sensors and non-contact temperature sensors, and according to the characteristics of materials and electronic components, it can be divided into two categories: thermal resistance and thermocouple.

1.Contact Temperature Sensor:

The detection element of the contact temperature sensor is in good contact with the object being measured. It brings it to thermal equilibrium by conduction or convection, so that the displayed value of the thermometer can directly represent the temperature of the object being measured.

2.Non-contact temperature sensor:

The sensitive elements of non-contact temperature sensors do not come into contact with the object to be measured. The sensor is generally used to measure the surface temperature of moving objects, small targets, and objects with small heat capacity or rapid temperature changes, and can also be used to measure the temperature distribution of a temperature field. .

3.RTD Temperature Sensor:

A RTD temperature sensor is a sensor that measures temperature using the principle that the resistance value of a conductor or semiconductor changes with its temperature. For different conductors (semiconductors), when the temperature changes by 1 degree, the resistance value changes differently, and the resistance value can be directly used as the output signal.

4.Thermocouple Sensors:

A thermocouple is a loop formed by connecting two conductors with different components. When the junction temperature is different, a thermal electromotive force is generated in the circuit. This phenomenon is called the thermoelectric effect.

Among them, one end that is directly used to measure the temperature of the medium is called the measuring end, and the other end is called the compensation end; Compensated termination display gauge that indicates the thermal electromotive force generated by the thermocouple. Thermocouples made of different materials are used in different temperature ranges and have different sensitivities. The metal materials used to make thermocouples must have good ductility, so thermocouple temperature sensors have an extremely fast response time and can measure the process of rapid temperature changes.