The electric buoy level gauge is a liquid level measuring instrument designed according to Archimedes' law and magnetic coupling principle. It can be used to measure water level, boundary and density, and is responsible for the output of up and down limit alarm signals. It is used to measure the water level inside the pressure vessel. It is composed of buoy, spring, magnetic rifling and indicator.

The electric buoy level gauge system is composed of detection, conversion and transmission. The inspection part is composed of buoy and link, the conversion part is composed of lever, torque tube assembly and sensor, and the transmission part is composed of CPU, A/D, D/A and LCD display.

Working principle of electric buoy liquid level gauge:

If the liquid is measured as having no liquid level, buoyancy is not affected by buoyancy, the connecting wire connected to the top of the buoy is taut, and the torsion lever is affected by the buoy's gravity to produce a fixed torsion. At this time, the buoy level gauge needs to output 4 milliamps of current. In other words, the buoy gauge is zero.

After the water level of the measured liquid rises, the liquid enters the measuring tank, the water level of the buoy peak rises, the volume of the discharged liquid continues to increase, and the volume of the internal buoy submerged in the medium continues to increase. According to Archimedes' law, the buoyant force on an object is equal to the volume of liquid that the object expels (i.e. the volume of water that the object is immersed in). The float bar is a small, heavy metal tube, so the weight of the liquid coming out of the buoy is less than the weight of the buoy itself, so the connector above the buoy remains tight. The torsion bar subtracts the weight of the liquid expelled by the buoy from the buoy gravity (buoyancy of buoyancy), creating a varying torque. At this time, the output current of the buoy water level gauge is greater than 4 mA.

When the water level of the tested liquid is high, the buoy is completely submerged by the test liquid. At this time, the volume weight of the liquid discharged by the buoy is a fixed number. The torsion force borne by the torsion bar is the weight of the buoy itself minus the weight of the liquid discharged by the buoy. At this point, the torsion bar is subjected to a fixed torsional force, and the current output of the buoy water system is full of 20 mA, that is, the buoy water system.