According to the buoyancy principle of the liquid level gauge, the float moves up and down in the measuring tube with the rise and fall of the liquid level. The magnetic steel inside the float drives the red and white columns to flip 180 degrees through magnetic coupling. When the liquid level rises, the flip column changes from white to red, and when it falls, it changes from red to white, thus indicating the liquid level.

The output of the upper and lower limit switches utilizes a magnetic float to move with the liquid level, causing the switch installed at the set position of the liquid level meter riser to actuate, achieving ON-OFF control or alarm.

Install a transmitter on the magnetic float level gauge for electric remote transmission. The transmitter consists of two parts: a sensor and a converter. It moves up and down through a magnetic float and uses magnetic coupling to sequentially move the measuring components inside the conduit, obtaining changes in resistance signals and converting them into standard current signals ranging from 0 to 10mA or 4 to 20mA for output. These signals are then connected to digital display instruments or computers for remote display.