Progres AgroBee-L Manual

AgroBee-L Manual
AgroBee-L Parshall System
Very low consumption radio modules and integrated parts of the
AgroBee-L system for open canal flows based on Parshall gauges
through an ultrasonic sensor that forms part of the controller.
The AgroBee-L Parshall model offers the following, according to the available format:
• 1 ultrasonic sensor:
‒ 1 sensor with TTL output for measurements up to 9 metres with 1mm precision
AgroBee-L
Parshall
The Parshall canal is a standardized Venturi canal. Parshall gauges are calibrated instruments
for measuring flows in open canals. It is technically described as a critical depth gauge. Its main
advantages are that there is only a small pressure drop through the gauge, which allows for the
easy passage of sediment or debris, without needing special access conditions or a buffer well or
even corrections for up to 60% submergence. Consequently, it is suitable for measuring the flow
in irrigation canals or natural currents with a gentle slope.
The meter consists of a section convergent with the bottom level, a funnel section with a des-
cending slope on the bottom, and a divergent section with an ascending slope at the bottom.
Thanks to this, the water drains at a critical speed through the funnel.
Ultrasonic sensor
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