Open channel flowmeter (time difference method) flow measurement system equipment

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The time difference flow rate measurement system equipment is an instrument used to measure the liquid flow rate of channels with non full pipes and open discharges. It can be widely applied in industries such as chemical, power, metallurgy, mining, and water conservancy. The production and calibration standards are based on the national calibration regulation JJG198-1994 for speed flow meters.
1. Application
Urban water supply diversion canal
Sewage treatment inflow and discharge channels
Chemical liquid and wastewater discharge channels in industrial and mining enterprises
Water conservancy engineering and agricultural irrigation channels
Flood discharge gate flow measurement

2. Characteristics
There are no special requirements for the cross-sectional shape and size of the channel.
It can be installed and maintained without stopping the water supply.
No flow obstruction, no head loss.
When the cross-section of the channel is large, multi-channel speed measurement is used to achieve high-precision measurement.
Can measure flow and velocity in both forward and reverse directions.
Large measurement range and high accuracy.
Can be used as a calibration device for open channel flow meters in the form of channel weirs or other methods.

3. Measurement principle
Using the principle of time difference ultrasonic measurement (the velocity difference caused by the propagation of ultrasonic waves in the direction of liquid flow and the opposite direction), a two-layer velocity measurement layer is distributed on the flow measurement section. A pressure type water level gauge is installed at the bottom of the channel to measure the water level, calculate the cross-sectional area of the water passage, and calculate the flow rate of the water passage section based on the hydraulic model.


4. Schematic diagram of flow measurement system