V-Notch (Triangular) Weir Monitor Overview

The V-Notch (triangular) Weirs are typically installed in open channels such as streams to determine discharge (flow rate).

The V-Notch (triangular) Weirs are typically installed in open channels such as streams to determine discharge (flow rate). The main component is a cylindrical weight suspended from a vibrating wire force transducer. As the water level changes, the changing buoyancy force on the cylinder acts directly on a vibrating transducer.

Product Features

  • Vibrating Wire precision water level sensor
  • Simple in, low cost and robust instrument
  • Accurate and sensitive water level monitoring
  • High resolution monitoring
  • Low maintenance system
  • Range: 300mm
  • Resolution*: 0.025% full scale (minimum)
  • Material: Stainless Steel
V-Notch (Triangular) Weir Monitor Data Sheet
File Size: 660 kb
File Type: pdf
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V-Notch (Triangular) Weir Monitor User Manual
File Size: 519 kb
File Type: pdf
Download File

Operation
The Vibrating Wire V-Notch Weir system has three notch options to suit different water flows and a choice of using manual or remote monitoring.

Manual reading has two options:
  • Manual reading of the optical readout by eye
  • Manual reading of the VW transducer using a VW readout

​When using remote reading, the Vibrating Wire transducer is connected to a data acquisition system. Once the user has chosen which notch option is most suitable for a specific project, the weir plate is mounted at the exit of an approach channel or stilling basin through which the flow to be measured is channelled.

The measuring point for the head of water is located upstream of the weir plate and comprises either an optical Stainless Steel scale fixed to the basin wall for manual readings by eye, or a Vibrating Wire transducer suspended in the head of water.

Application
The Vibrating Wire V-Notch Weir system uses the principle of gravitational discharge of water over a triangular or rectangular notched weir plate.

Typical applications include:
  • Longterm monitoring of dams
  • Drainage systems in dams and tunnels
  • Springs and artesian wells

Technical Rating
As the correct installation of any monitoring sensor or system is vital to maximise performance and accuracy, Geomotion makes the following recommendations for the skill level of the installation contractor.

Technical Rating for this Product:  INTERMEDIATE

The installer already has previous experience and/or training in the installation of this instrument or system.

Geomotion offer installation and monitoring services to support this system. For more information please contact us.