With the development of industrial production, the measurement and control of liquid level is becoming more and more important, involving production efficiency, product quality, safety and environmental protection. In order to meet the needs of different industrial occasions of liquid level measurement, various types of liquid level meter came into being. Among them, digital level gauge is a digital display technology to measure the liquid level of the instrument, with intuitive display, high precision, stable and reliable, strong anti-interference ability, etc., widely used in electric power, metallurgy, chemical industry, food, brewing, pharmaceuticals, machinery and equipment, sewage treatment and other fields. This article will introduce several types of digital level meter and its principle, characteristics and applications.

There are various types of digital level meters, which can be classified into hydrostatic, ultrasonic, guided pulse, etc. according to different measuring principles and applications.

Hydrostatic digital level gauge is based on the principle that the measured static pressure of the liquid is proportional to the height of the liquid, and adopts isolated diffusion silicone sensitive element or ceramic capacitive pressure sensitive sensor to convert the static pressure into electric signal, and then after temperature compensation and linear correction, it will be transformed into a standard electric signal (generally 4-20mA/1-5VDC), which can be connected to meter, recorder, computer, PLC program controller or alarm. etc. Hydrostatic digital level meter is suitable for liquid level measurement of conventional viscous, weakly corrosive, fluid liquid with scale impurities.

Ultrasonic digital level gauge is to use ultrasonic transmitter to transmit ultrasonic waves to the measured liquid, and then receive the reflected ultrasonic signals, according to the ultrasonic propagation speed in the air and the time difference between the transmission and reception, calculate the distance of the liquid surface from the transmitter, so as to get the height of the liquid level. Ultrasonic digital level meter has the characteristics of non-contact, non-pollution, easy installation, simple maintenance, etc. It is suitable for different material targets, and is not affected by color or gloss.

Guided Pulse Digital Level Gauge utilizes the microwave transmitter on the guided wave conduit to transmit microwave pulses to the measured liquid, and then receives the reflected microwave pulse signals, and according to the propagation speed of the microwave in the conduit and the time difference between the transmission and the reception, it calculates the distance of the liquid surface from the transmitter, so as to get the height of the liquid level. The guided pulse digital level meter is characterized by large measuring range, high precision, strong anti-interference ability, etc. It is suitable for liquid level measurement of water, oil, chemicals, mucus and other liquids.

In a word, digital level gauge is a kind of modern digital display technology combined with traditional measuring principle, which can meet the liquid level measurement needs of different industrial occasions. There are many types of digital level meters, according to different measurement principles and applications, they can be divided into hydrostatic, ultrasonic, guided pulse, etc. These types of digital level meters have their own advantages, disadvantages and applications. These types of digital level meters have their own advantages and disadvantages and scope of application, you need to choose the right instrument according to the actual situation. Digital level meter plays an important role in industrial production, and contributes to the improvement of production efficiency, product quality, safety and environmental protection.