Irrigation IOM
Sensors
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A minimum slope in an ascending flow of 1: 500 or higher is recommended in order to stimulate the entrapped
air pocket to move away from the meter.
A second solution is to mount the flowmeter vertically with an upward flow stream, which ensures that the air
always moves quickly past the meter.
Importance of air vent valves
The general principle of each installation is to ensure that the device is always full of water; however, this is not
always possible since a part of the network could drain when the pumps are turned o.
It is, therefore, essential to ensure that the design incorporates a properly designed and sized air vent valve to
release the air when the pump starts, making sure that the meter immediately starts reading.
Drawings are made with an
exaggerated slope for greater clarity
Fig. 40 Flowmeter with slight ascending slope with air vent at the top
Fig. 41
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