Several common on industrial liquid level sensor

Industrial level measurement as long as there are so few ways:

input type liquid level sensor, ultrasonic liquid level sensor, radar liquid level sensor, pressure type liquid level sensor. The above four kind of sensor, has its own advantages, respectively introduce the following project.

1, the inputting type liquid level sensor, as the name implies, is the sensor probe into the liquid, the use of liquid pressure, to measure the depth of the liquid. Advantages of direct contact with the liquid, the price is relatively cheap. The disadvantage is that when the liquid is strong corrosive medium, or medium viscosity is very big, the inputting type liquid level sensor is not suitable.

2, ultrasonic liquid level sensor, is to use the principle of ultrasonic launch reception, non-contact measurement of measuring the depth of the liquid. Ultrasonic wave propagation velocity, in a certain temperature is relatively constant, in the case of know already speed, just calculate ultrasonic to receiving time, distance ultrasonic probe to the liquid surface can be calculated. Deep pool or high pot is certain, the distance to calculate the liquid level to the probe, also calculate the liquid level to the bottom or the distance of the tank bottom, depth of the liquid. The advantages of ultrasonic liquid level sensor is a non-contact measurement, more health, can detect high corrosive medium. Disadvantage is that the occurrence of ultrasonic receiving request is higher, to the environment under the condition of the environment is bad, ultrasonic liquid level sensor is not applicable.

3, radar liquid level sensor, is the use of microwave pulse transmitting and receiving to measure the depth of the liquid, radar liquid level sensor points contact type and non-contact two forms. Microwave emission does not need to medium, so in the case of vacuum can be measured. In addition, the radar liquid level sensor can be used in a harsh environment, than the use of ultrasonic range is wide.

4, compression type liquid level sensor, mainly used in tank, its installation method are installed thread and flange. And frequently separate mouth cans and cans. This single flange level and double flange level. Its use scope is narrow.

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key words: thermal resistance, thermocouple, thermal resistance, platinum resistance, PT100, PT1000, pressure sensor and digital temperature sensor