Float Liquid Level
Gauges measure the height of liquids in
vessels based on displacement of its float.
The float connected to the measuring tape rises and falls
due to the changes
of liquid level in the tank. When the liquid
level rises, float will rise accordingly and the tape connected
to the spring drum will be wound.
With liquid level falling in the vessel, the float drops and the
pulled by the weight of the float. This movement of
float is transmitted to
the point-scale plate (or counter) by the
gear mechanism. Fig. 2.
If remote indication is needed, the mechanical measurement
is converted to a
4-20 mA output signal by a potentiometer.
Some models can send 4-20 mA
signal and up to 8 point
alarms to a remote location.