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PARSHALL MEASURING FLUME

Flow rate measurement with Parshall flume and FLOWBOX flow meter .......................

SUBJECT OF THE OFFER

The subject of our offer is a Parshall flume intended for measuring momentary and total flow of the liquid in gravitational channels, with the use of an ultrasonic flow meter FLOWBOX. Upon request, it’s also possible to carry out pre-investment technical consulting, as well as subsequent installation, launching* and protocol-based delivery of flow meter for the use. We also sell individual elements of the measuring set manufactured by us (e.g. only Parshall flume or only flow meter FLOWBOX).

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• * Launching of our ultrasonic flow meter FLOWBOX in your facility (unlike many products of the competition) is very simple and in most cases, it doesn’t require a visit of specialized service – we provide factory pre-programmed (for the given type of flume or measuring weir) and pre-calibrated set (only one parameter needs to be adjusted).

Download

  Parshall flume data sheet
  FLOWBOX flow meter data sheet
  FLOWBOX flow meter manual

MEASURING SET DESIGN

1. Parshall measuring flume
2. FLOWBOX flow meter

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• * FLOWBOX flow meter = Ultrasonic level sensor with cable + M1600 Transmitter

ASSUMPTIONS

The liquid flow rate measurement with Parshall flume and water rise method in rectangular channels is based on the actual liquid level measured by the ultrasonic sensor (radar sensor, optional) at the hydraulic structure converted into the value of flow ratio by the measuring transmitter.

The basic condition to apply the method is to provide, undisturbed and laminar flow in a measuring flume and free outflow of liquid from the measuring flume.

PARSHALL MEASURING FLUME

Parshall flumes in accordance with ISO 9826 data sheet are intended for measurement of volumetric flow rate in rectangular channels with gravity flow. The flumes are made of stainless steel or PVC sheets and enable measurements within the range specified in the table below.

The flume is embedded in concrete in a rectangular channel with subcritical flow. The conditions can be obtained by maintaining a specific gradient and minimum inlet and outlet channel length. The measurement in lower range for a specific flume type will be encumbered with a significant error.

THE FAMILY OF PARSHALL MEASURING FLUMES

Legend:
1 - Parshall flume
2 - Well
3 - Inlet channel
4 - Ultrasonic level sensor
5 - Outlet channel

PARSHALL FLUME ASSEMBLY RECOMMENDATIONS

• The Parshall flume should be embedded in concrete in a rectangular channel.
• The Parshall flume must be installed horizontally (longitudinally and crosswise), without fall.
• Provide free, undisturbed inflow and outflow of liquid from the flume by means of ensuring long enough straight inlet and outlet channel parts.
• The length of straight inlet channel section should be at least 10 x A with a propper slope before the Parshall flume.
• The length of straight outlet channel section should be at least 5 x A with a propper slope after the Parshall flume.
• Inlet section before the Parshall flume can be evened to the flume's level it can be chamfered with max 15° to the existing channel's level.
• If existing channel is wider than a Parshall flume, a concrete diffuser to it's walls with max 45° should be made after flume's concreting.
• Install the ultrasonic sensor in the handle in the right spot (X distance).
• Install the M1600 transmitter in a sheltered place or in a cabinet.
• Connect the ultrasonic sensor with the M1600 transmitter with a cable.

Exemplary Parshall flumes instalations------------