The flows in open channels are storically controlled with the use of artificial canal barrages or equivalent structures, based on empirical data, by measurement of the water height on a meter pole or equivalent depth on refering to the structure of the barrier weir obstacle.

In recent times, the use of Venturi channels and or weirs has been supplanted by the most economic and practical ultrasonic sensors, for area per velocity calculation.

When and where, however, these prefabricated structures are already in place for some time as primary flow element, our instruments like HM3, FLD3PRO monitoring stations meters are capable to connect to a depth sensor so as water level ultrasound sensor by dedicated card.

The bundled software will calculate the equation more suited to the morphology of weir or flume primary kind: Parshall ducts, chutes av 30 °, 45 °, 60 °, 90 °, Cipoletti weirs, Weir, Replogle, Venturi channels, rectangular weir, or other, with possibility to linearize the calculation up to 35 programmable custom points.

The water level height on a Parshall channel is measured with the corresponding no contact ultrasonic sensor, for example our model Echoflo.

The electronic unit automatically applies the correct equation for calculating the instantaneous flow rate and total flow amount along the time.

The readings are then available in addition to the discharging from the instrument's internal memory, even for data transmission by remote, depending on the options chosen for the communication card:

  • WebCom card for transmission data and alarms via GSM / GPRS net, make easy to collect an archive via Internet on web hosting sites. Reading from clients on mobile phones, notebook, iPad, etc. any time possible;
  • FloSi RS232-485 serial card for remote reading on wired fieldbus and collecting data by PLC or PC connected.

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