A bubble level measurement system is a low-cost, simple, accurate and reliable method to
measure the liquid level in an open or vented tank.Through a dip tube, the open end of which
is situated close to the tank's bottom, a low but constant flow of air or an inert gas is purged.
A constant stream of bubbles must be released from the dip tube's open end with just enough
flow to overcome the hydrostatic pressure created by the liquid level.
The liquid level in the tank is proportional to the pressure inside the dip tube as long as the
flow is constant and uninterrupted.
An accurate liquid level reading is obtained by detecting the variation in this pressure using
a differential pressure transmitter or a pressure transmitter.
When measuring the level of contaminated liquids or higher consistency media
(such as pulp level in pump stand pipes), a water purge is utilised rather than air.
Industrial Applications: