Bubbler Systems for Liquid Level Measurement
These systems have no moving parts, which makes them a reliable and robust solution.
The technology has been tried and true for many years and is an economical solution for a variety of environments.
The bubbler system works by forcing a gas (compressed air) at a near constant flow rate out the bottom of an open tube (bubble/dip tube) submerged in liquid. The back pressure in this tube is measured. With the process liquid’s density known, the level can be calculated using the back pressure and density. A pressure transmitter converts the back pressure to provide a 4-20ma output to a controller, which calculates the liquid’s level.