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Industry Information
Pressure type liquid level gauge is a pressure sensor for measuring liquid level
2012-3-7 11:29:23

Working principle of pressure level gauge

是一种测量液位的压力传感器. The pressure type liquid level gauge is a pressure sensor that measures the liquid level. The pressure type liquid level gauge (level transmitter) is based on the principle that the measured static pressure of the liquid is proportional to the height of the liquid, and uses foreign advanced isolated diffusion silicon sensitive elements or ceramic capacitor pressure sensitive sensors to convert the static pressure It is an electrical signal, and then converted into a standard electrical signal (typically 4-20mA / 1 to 5V DC) after temperature compensation and linear correction.

The static pressure input type liquid level transmitter (level gauge) is suitable for the liquid level measurement of various media in systems and industries such as petrochemical, metallurgy, power, pharmaceutical, water supply and drainage, environmental protection and other systems. The exquisite structure, simple adjustment and flexible installation methods provide convenience for users to use easily. 4 ~ 20mA, 0 ~ 5v, 0 ~ 10mA and other standard signal output methods can be selected by the user as required.

working principle:

Using the principle of static pressure measurement:

投入到被测液体中某一深度时,传感器迎液面受到的压力公式为:Ρ = ρ .gH + Po When the pressure type liquid level gauge is put into a certain depth in the liquid to be measured, the pressure formula on the sensor's liquid surface is: P = ρ .gH + Po

In the formula:

P: pressure on the transmitter's liquid front

ρ: measured liquid density

g: local gravity acceleration

Po: atmospheric pressure on the liquid surface

H: Depth of the transmitter into the liquid

At the same time, the pressure of the liquid is introduced into the positive pressure cavity of the sensor through the gas-conducting stainless steel, and then the atmospheric pressure Po on the liquid surface is connected to the negative pressure cavity of the sensor to offset the Po on the back of the sensor, so that the pressure measured by the sensor is ρ. gH, obviously, by measuring the pressure P, the level depth can be obtained.


性能和优点其机械结构对过载及腐蚀性介质具有高抵抗性。 The performance and advantages of pressure-type level gauges have high resistance to overload and corrosive media. High-precision, long-term stable ceramic capacitor and imported diffusion silicon measurement unit. The sealed electronic module and dual filter pressure compensation system can resist the impact of climate field changes. The electronic module can output 4 ... 20mA signals and is also a module with overvoltage protection. Select the integrated temperature sensor Pt100 for simultaneous level and temperature measurement. The corresponding accessories provide a complete measurement solution.