Wall-mounted Doppler Open Channel Flow Meter

Brief introduction:

Wall-mounted type Doppler Open Channel flow meter consists of a wall-mounted flow calculator and a transducer. The transducer consists of a flow velocity sensor, a water depth sensor of ultrasonic principle, a water depth sensor of pressure principle and a conductivity sensor, which are separately used to measure flow velocity, depth, and conductivity of water in rivers, streams, open channels and pipelines.

Composition of the transducer: 

Detailed illustration for the transducer as follows:

 1)  Water flow velocity measurement uses Ultrasonic Doppler principle in Quadrature Sampling Mode. The flow sensor transmits ultrasonic energy through its epoxy case into the water. The suspended sediment particles or small gas bubbles in the water reflect some of the transmitted ultrasonic energy back to the flow sensor’s ultrasonic receiver which processes this received signal and calculates the water flow velocity.

  2) Two methods for water depth measurement. One method is using the top mounted ultrasonic sensor in the transducer to measure water depth. Another method is using the bottom mounted pressure sensor in the transducer to measure water depth. User should select the suitable water depth measuring method according to the on-site condition.

  3) In the transducer, there is a conductivity meter which has 4 conductivity electrodes which expose to the water at the top of the transducer. When the transducer is working, the conductivity electrodes continuously measure the conductivity of the water for user analyzing the nature of the water in open channels or pipes.

Features：

● The fluid must contain a certain amount of air bubbles or suspended solid particles
● 20 coordinate points to describe cross section of the river’s shape.
● Measurement of flow velocity, depth and conductivity of water.
● Flow Velocity Range: 0.02 ~ 0.8m/s,  0.02 ~ 1.6m/s, 0.02 ~ 3.2m/s, 0.02 ~ 6.4m/s, 0.02 ~ 13.2m/s,  bi-directional, accuracy  1%.
● Depth measurement by the principles of pressure sensor or ultrasonic level sensor.
● Depth Range: 0.02 to 5 m (for ultrasonic principle, error: ±1mm); 0 to 10m (for pressure principle, error: ±2mm).
● Flow velocity measurement in both forward direction and reverse direction
● With coordinate correction and pressure compensation function.
● IP68 Epoxy-sealed body design for transducer, long time working under water.
● RS485 communication (MODBUS protocol) optional, for connecting to the upper computer.

Technical data of  Transducer:

Technical data of Flow calculator:

Installation Diagram:

                                   Partially pipe                                                    Pipe with siltation on bottom           

                            Triangle Channel                                                              Rectangular channel

                            Polygonal channel                                                   Irregular-shaped channel