The float level gauge consists of a float ball, a plunger, and the like. The float level gauge is mounted on the top of the container through the connecting flange. The float ball level gauge LV55 floats on the liquid surface according to the principle of discharging the liquid volume phase, etc. When the liquid level of the container changes, the float ball also moves up and down. Due to the magnetic action, the reed spring of the float level gauge is magnetically attracted, and the liquid level position is changed into an electric signal. The actual position of the liquid is displayed by the display meter, and the float level gauge reaches the long distance of the liquid surface. Detection and control.