Simple principle of mechanics and magnetism harnessed to offer an absolutely safe, reliable and trustworthy level indicator for dangerous and toxic liquids under high pressure and temperature. 
As the liquid level rises in the tank, the float is lifted up due to buoyancy. The float carries a stem attached to it and on the other side of the stem a magnet is fixed. The float stem moves inside an SS enclosure. External to this enclosure is a glass tube, which carries the magnetic follower (Red in Colour). 
Due to magnetic attraction, the magnet on the float stem and the magnetic follower are coupled and move in union. As the float moves along with the liquid, the follower also moves inside the glass tube, and the position of the follower can be read against the scale.

Specification