An open channel bubbler flow meter works by measuring the amount of pressure needed to force a bubble from the end of a bubble line. The bubble line is placed at the zero level of the primary device to allow the meter to read the full level in the device.
Inside the flow meter a small air pump and reservoir to provide a source of pressurized air. A transducer inside the flow meter senses the mount of air pressure needed to force a bubble from the end of the bubbler tube. As the water level increases, the pressure required to force the bubble from the tube also increases - providing a direct relationship to the water level.
Bubbler flow meters are a good choice for:
- Flow streams with foam or turbulence
- Applications where the channel occassionally runs dry (stormwater monitoring)
- Large channels
- Sites with large, frequent, or rapid liquid temperature changes (laundries, cooling towers, equipment washdown, etc.)