There are many types of digital flow sensors in industrial applications. Different materials, different types of digital flow sensors have different range range, but it is certain that the digital flow sensor is widely used in fluid (medium) In the control device. It is very common in industry and life. In order to understand the application scope of digital flow sensors and the problems that should be paid attention to in the application, it is necessary to understand the working principle of digital flow sensors in depth.

First of all, there must be a fluid (medium) pipeline in the digital flow sensor. The fluid (medium) channel is located inside the shell and is equipped with a piston with an permanent magnet. During work, liquid will cause a certain pressure. When the pressure difference caused by the flow of the piston is pushed, the magnetic piston will work for the sealing reed sensor in the device.

The diameter of the Pistons determines the starting flow. If the traffic is reduced, the pressure will change, and the stainless steel spring will be pushed back to the piston. If the reed sensor is activated, remote alarm or instructions can be performed and it is integrated into an automatic control system. This is the simple operation principle of digital flow sensors.

In digital flow sensors, the working principle of the buoyancy level meter is based on the principle of variable buoyancy. The buoyancy moves up and down with the liquid level of the tube wall. The spring force on the buoyancy is directly proportional to the liquid level. Measure the level by measuring the twisting angle caused by the measuring spring force. However, according to the principle of constant buoyancy, the float moves up and down with the liquid level in the measurement tube. The permanent magnetic steel in the floating ball drives the red and white flip column to rotate 180 degrees by coupling. When the liquid level rises, the roller changes from white to red, and when the liquid level drops, the roller changes from red to white. Implement the liquid level indication.

There are many types of liquid sensors, and there are more common thermal -guided digital traffic sensors. Based on the thermal principle, two resistors are included in the closed probe. Among them, heating is used as a detection resistance, and the other is not heated as the benchmark resistance. When the medium flows, the heat on the heating resistance is taken away and the resistance is changed. The difference between the resistance of individual resistance is used as a basis for judging flow velocity.

The development of the final digital flow sensor will develop in the direction of low cost and high reliability.