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Temperature Sensor

Time: 2021-05-12

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Temperature Sensor

Temperature sensor refers to a sensor that can sense temperature and convert it into a usable output signal. The temperature sensor is the core part of the temperature measuring instrument, and there are many varieties. According to the measurement method, it can be divided into two categories: contact type and non-contact type. According to the characteristics of sensor materials and electronic components, it is divided into two types: thermal resistance and thermocouple. According to the mode of output signal, it can be roughly divided into digital temperature sensor and logical output temperature. Sensors and analog temperature sensors are three categories.

                                      Temperature sensor supplier

Precautions for selecting temperature sensor

1. Whether the environmental conditions of the measured object damage the temperature measuring element.

2. 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. 3800 100

3. When the temperature of the measured object changes with time, whether the hysteresis of the temperature measuring element can meet the temperature measurement requirements.

4. The size and accuracy requirements of the temperature measurement range.

5. Whether the size of the temperature measuring element is appropriate.

6. If the price is guaranteed, is it convenient to use.

When the temperature sensor is installed and used, the following errors should be avoided to ensure the best measurement effect.

1. Errors caused by improper installation

2. Thermal resistance error

At high temperature, if there is a layer of coal ash on the protective tube and dust is attached to it, the thermal resistance will increase and hinder the heat conduction. At this time, the temperature indication is lower than the true value of the measured temperature. Therefore, the outside of the thermocouple protection tube should be kept clean to reduce errors.

3. Errors introduced by insulation deterioration

If the thermocouple is insulated, too much dirt or salt slag on the protection tube and pull-out board will cause poor insulation between the thermocouple poles and the furnace wall, which is more serious at high temperatures, which will not only cause the loss of thermoelectric potential but also introduce interference. The error caused by this can sometimes reach Baidu.

4. Errors introduced by thermal inertia

Due to the thermal inertia of the thermocouple, the indicator value of the meter lags behind the change of the measured temperature, and this effect is particularly prominent during rapid measurement. Therefore, thermocouples with thinner thermoelectrodes and smaller protective tube diameters should be used as much as possible. The protective tube can even be removed when the temperature measurement environment permits. Due to the measurement lag, the amplitude of the temperature fluctuation detected by the thermocouple is smaller than the amplitude of the furnace temperature fluctuation. The greater the measurement lag, the smaller the amplitude of thermocouple fluctuations, and the greater the difference from the actual furnace temperature.

For example, the installation position and insertion depth of the thermocouple cannot reflect the true temperature of the furnace. In other words, the thermocouple should not be installed too close to the door and heating, and the insertion depth should be at least 8-10 times the diameter of the protective tube.