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Abstract: The submersible liquid level sensor is a pressure sensor that measures the liquid level. Based on the principle that the static pressure of the measured liquid is proportional to the height of the liquid, an isolated diffusion silicon sensitive element or a ceramic capacitive pressure sensitive sensor is used to convert the static pressure. Converted into electrical signals, and then converted into standard electrical signals after temperature compensation and linear correction, generally suitable for liquid level measurement of various media in petrochemical, metallurgy, electric power, pharmaceutical, water supply and drainage, environmental protection and other systems and industries.

 

First, the measurement principle of the input liquid level sensor

 

The basic working principle of the submersible level gauge is the hydrostatic level measurement, that is, the principle that the static pressure of the measured liquid is proportional to the height of the liquid. In a liquid medium, the pressure generated at a certain depth is generated by the weight of the medium above the measurement point. It is proportional to the density of the medium and the local acceleration of gravity. The proportional relationship between them is reflected by the formula P=ρGH. Where P=pressure, ρ=media density, G=gravitational acceleration, H=depth of measuring point.

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Submersible level transmitters generally use the piezoresistive effect of diffused silicon or ceramic sensitive elements to convert static pressure into electrical signals. Temperature compensated and linearity corrected. Converted to 4-20mADC standard current signal output. The sensor part of the submersible liquid level transmitter can be directly put into the liquid, and the transmitter part can be fixed with a flange bracket, which is extremely convenient to install and use. Solid-state structure, no moving parts, high reliability, long service life High-precision measurement from water, oil to paste with high viscosity, not affected by foaming, deposition, electrical properties of the measured medium Wide range Temperature compensation. It also has power supply reverse polarity protection and overload current limiting protection.

 

Second, the characteristics of the submersible level meter

 

      

 The delicate structure of the submersible level gauge, simple adjustment and flexible installation provide convenience for users to use easily. The sensor with heavy anchor is suitable for liquid level measurement in petroleum, chemical, electric power and other industries.

 

 The main advantages of the submersible level gauge are: high measurement accuracy; easy installation; signals can be transmitted remotely and remotely; it can resist the corrosion of various media by choosing different materials; it is suitable for explosion-proof occasions; the price is moderate. Good stability, long-term stability of full scale and zero position, not affected by foaming, deposition and electrical characteristics of the measured medium. It has reverse protection and current-limiting protection circuits. When the positive and negative poles are reversed during installation, the transmitter will not be damaged. When abnormal, the transmitter will automatically limit the current. Solid structure, no moving parts, high reliability, simple structure, economical and durable, long service life.

 

 The disadvantages of the submersible level gauge are: the measurement signal needs to be converted; the temperature of the high temperature medium over 125°C cannot be measured; the density of the measurement medium must be uniform. After understanding the basic working principle of the submersible level transmitter, many people have little understanding of the main technical indicators of the submersible level transmitter.

 

       3. Main technical indicators of the submersible liquid level transmitter
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Take a certain submersible level gauge as an example, its measurement range: 0.3～110m, accuracy: 0.2, 0.5, 1.0 grades, working temperature: -20～80℃, output signal: two-wire system 4～20mADC, power supply voltage: standard 24VDC, insensitive area: ≤±1.0%FS Load capacity: 0-600Ω, relative temperature: ≤85%. Protection class: IP68 Explosion-proof mark: ExiaⅡCT4-7.

Fourth, the application of the submersible level gauge

 

 Submersible hydrostatic level gauges have standard protection against surge voltage, RFI, overvoltage and reverse polarity protection to ensure high reliability. At present, the bottom measurement of vertical metal cans is still in an offline state, that is, manual measurement is performed in an empty can state, and then the bottom volume increment is obtained by the formula given by the geometric measurement method. This method cannot realize automatic measurement, is time-consuming and labor-intensive, and has poor real-time performance. The submersible level gauge can make up for this deficiency. The submersible level gauge is a special kind of liquid level gauge.

If you want to know more about the parameters and quotation of CIXI level meter liquid level sensor, please contact winny:sales01@cxflowmeter.com