Common liquid level sensor working principle of three forms

Sensor technology is with the development of science and technology and the need of modern industrial technology constantly improve and improve. Liquid level sensor also has a lot of kinds, different species have different working principle, performance, and is not the same as the scope of application, the following is from a different form to analyze the working principle of different liquid level sensor. The working principle of ultrasonic liquid level sensor is made by transducer high-frequency ultrasonic pulse reflected back surface of the measured medium, the echo of part were the same receivers, which is transformed into electrical signals. Ultrasonic pulse with acoustic velocity spread, from launch to receive needed by the ultrasonic pulse interval and the transducer to the surface of the measured medium is proportional to the distance. The distance between S and the relationship between the sound velocity C and transmission time T can be expressed in the following formula: S = CT / 2 due to launch ultrasonic pulse width to a certain extent, makes the distance transducer close small section area of the reflected wave and transmitted wave overlapping, unable to identify, can't measure the distance value. This area is referred to as the measuring blind area. The size of the blind area is associated with the model of ultrasonic liquid level sensor. Ultrasonic liquid level sensor can be applied to all kinds of complicated conditions. Transducer built-in temperature sensor, the measured values of temperature compensation can be realized. Servo type liquid level sensor is a new type of liquid level sensor in recent successful, mainly used in the measurement of light oil. Compared with the radar liquid level sensor to form strong competition. Basic principle with steel belt type liquid level sensor, but the force sensor and servo system with precise, form a closed loop control system, by considering the steel strip its own gravity, the float height accurately adjusted to balance gravity and buoyancy, get accurate current level to the roof of the height, in order to get liquid level value. Static pressure type liquid level sensor is to use the uniform pressure is proportional to the height of the relationship between reduced by measuring the fluid pressure at the bottom of the liquid level height. Because the static pressure type liquid level sensor is highly affected by the density and temperature, so the precision is relatively poor, and to eliminate these effects, static pressure type liquid level sensor requires a lot of other testing instrument, and build a perfect higher cost of static pressure measurement system. By static pressure measurement principle: when the liquid level transmitter into the liquid to be tested in a certain depth, the sensor to meet the pressure on liquid surface formula is: P = rho gH + Po, P: pressure transmitter into liquid level; Rho: the measured liquid density; G: the local acceleration of gravity; Po: liquid surface atmospheric pressure; H: transmitter into the depth of the liquid. At the same time, through the gas leading stainless steel will be introduced to the liquid pressure sensor of positive pressure cavity, and atmospheric pressure on the surface of the liquid Po and sensors connected to the negative pressure cavity, to offset the Po on the reverse of the sensor, the sensor measured pressure is: rho g. H。 Obviously, by measured pressure P, can get the depth of the liquid level. Above is the common working principle of three forms of liquid level sensor, we can according to the above content to do some reference, hope to help you learn some basic knowledge about liquid level sensor. Through the above description, in order to reduce the error, the user can consider to choose a suitable instrument.

mass flow meter has become a standardized way of dealing with endress hauser ultrasonic flow meter.

To receive more professional tips and super quality products for insertion ultrasonic flow meter, go to our website Sincerity Flow Meter to place your order. Do not wait any longer.

By balancing the efficiencies of new technologies with the personal touch of highly trained and motivated professionals, Beijing Sincerity Automatic Equipment Co., Ltd is able to deliver solutions and services that exceed our customers’ expectations. We thereby earn their loyalty.

We persevere in keeping the customers pleasant and supporting them with mass flow meter at a reasonable price.

Beijing Sincerity Automatic Equipment Co., Ltd has a number of producing line for producing mass flow meter.