Bubbler Tube System for Level Measurement – Operating Principle.
Bubbler tubes provide a simple and inexpensive but less accurate (±1-2%) level measurement system for corrosive or slurry-type applications or in open or vented containers, especially those in harsh environments such as cooling tower sumps, swimming pools, reservoirs, vented fuel tanks, drain sumps, air washers, etc
In the bubble tube system, liquid level is determined by measuring the pressure required to force a gas into a liquid at a point beneath the surface as shown below:
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