Liquid level gauge is the location for viewing the internal surface of the device. Common liquid level gauge plate liquid level gauge, glass tube liquid level gauge, float type level gauge, and magnetic level gauge 4 types, particularly in the glass tube liquid level gauge is the most common. Liquid level gauge structure there are several types, some of which have been standardized, and most commonly used is the glass tube liquid level gauge, glass plate liquid level gauge, etc.

This control is an independently mounted water flow sensing device that makes or breaks an electrical circuit when flow stops or starts.