Level gauge's application case in industry

The drop-in liquid level sensor is a pressure sensor that measures the liquid level. Based on the principle that the measured liquid static pressure is proportional to the height of the liquid, it uses an isolated diffused silicon sensor or a ceramic capacitor pressure sensitive sensor to convert the static pressure into After temperature compensation and linear correction, the electrical signal is converted into a standard electrical signal, which is generally suitable for level measurement of various media in petrochemical, metallurgical, electric power, pharmaceutical, water supply and drainage, environmental protection and other systems and industries.

Measuring principle of float type level gauge

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

The input type liquid level transmitter generally uses the piezoresistive effect of diffused silicon or ceramic sensitive components to convert static pressure into electrical signals. After temperature compensation and linearity correction. Convert into 4-20mADC standard current signal output. The sensor part of the throw-in liquid level transmitter can be directly thrown into the liquid, and the transmitter part can be fixed with a flange bracket, which is extremely convenient to install and use. Solid structure, no moving parts, high reliability, long service life. High-precision measurement can be performed from water, oil to thick pastes, and is not affected by the foaming, deposition, and electrical characteristics of the measured medium. Temperature compensation. It also has power reverse polarity protection and overload current limit protection.

The characteristics of the input pressure level sensor

The exquisite structure, simple adjustment and flexible installation method of the input level gauge provide convenience for users to use it easily. The sensor can be equipped with a heavy anchor, which is suitable for liquid level measurement in petroleum, chemical, electric power and other industries.

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

The shortcomings of the input type liquid level gauge are: the measurement signal needs to be converted; it cannot measure the temperature of the high temperature medium exceeding 125 ℃; the density of the measurement medium must be uniform. After understanding the basic working principle of the input type liquid level gauge, many people have a little knowledge of the main technical indicators of the input type liquid level transmitter.

The main technical indicators of the input type liquid temperature sensor

Take a certain input level gauge as an example, its measuring range: 0.3～110m, accuracy: 0.2, 0.5, 1.0 grade, 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 level: IP68 Explosion-proof mark: ExiaⅡCT4-7.

The application of the input liquid level transmitter

The input type static pressure level gauge has standard protection functions to prevent surge voltage, radio frequency interference, overvoltage and reverse polarity protection to ensure high reliability. At present, the bottom volume measurement of vertical metal tanks is still offline, that is, it is manually measured in the empty tank state, and then the bottom volume increase is obtained by the formula given by the geometric measurement method.

quantity. This method cannot realize automatic measurement, is time-consuming and labor-intensive, and has poor real-time performance. The input type liquid level gauge can make up for this shortcoming. The input type level gauge is a special kind of level gauge. The level gauge that we usually see has a characteristic, that is, it can only measure some delicate liquids or liquids with no flow rate, but the input type liquid level The meter can measure the liquid level with a very fast flow rate. It can be widely used for liquid level measurement in non-sealed occasions (open containers).