Bubbler open channel flow-meter
4230 Teledyne Isco

Isco 4230 Bubbler Flow Meters use an internal air compressor to force a metered amount of air through a bubble line submerged in the flow channel. By measuring the pressure needed to force air bubbles out of the line, the flow level is accurately determined.

Measurement accuracy of the 4230 is not affected by wind, steam, foam or turbulence, nor by suspended solids and rapidly changing head heights that can cause problems for some bubbler flow meters. Because only the bubble tube contacts the flow, corrosive chemicals are not a problem. The 4230 also resists damage by lightning and debris, making it ideal for stormwater applications.

Automatic Drift Compensation makes Isco bubbler flow meters the most accurate level measurement technology. In standby applications such as stormwater runoff monitoring, Automatic Drift Compensation also allows the 4230 to maintain calibration indefinitely. Automatic bubble line purging prevents clogging, and the meter's internal software senses rapidly rising heads and increases the bubble rate to maintain maximum accuracy.