Open channel flowmeter

1. Product introduction of open channel flowmeter

Open channel flowmeter is also called open channel flowmeter and open channel sewage discharge flowmeter. Open channel flowmeter adopts non-contact measurement method and is used to measure the flow of various fluids in open channels. It can be used for the measurement of sewage discharge and for farmland water conservancy and irrigation. water metering and drainage improvement projects in the old city. The open channel flow meter mainly consists of a radar flow meter and a radar water level meter. The flow meter is used to collect the surface flow velocity of the fluid, and calculates the average flow rate of the water cross section through model calculation, and then combines the water level and cross section information measured by the water level meter to calculate the flow cross section area. , thus using the formula flow rate = average flow velocity × flow cross-sectional area × correction coefficient to obtain the flow rate, where the correction coefficient is calculated based on the standard value obtained from the actual measurement environment.

2. Technical parameters of open channel flowmeter

3. Selection of open channel flowmeter measurement channel sections

The selection of measuring channel sections is directly related to the accuracy of measuring flow. In order to obtain better measurement results, the measuring channel sections should try to meet the following conditions:

1. There are no huge rocks blocking water in the test canal section, and there are no huge whirlpools, turbulence and other phenomena.

2. The test canal section should be straight, stable, and have concentrated water flow.

3. The test channel section needs to be hardened, and the measurement section should be regular.

4. The test channel section should be kept smooth to prevent accumulation of floating objects.

4. Precautions for installation of open channel flowmeter

1. Install the flow meter, water level meter and flow meter radar without obstruction, otherwise the measurement accuracy will be affected.

2. When installing the flow meter, try to ensure that the upper surface of the housing is level and install it in the middle of the channel.

3. It is recommended that the current meter beam should face the direction of the incoming water, as shown in Figure 3-3, and the horizontal angle to the direction of the water flow should be 0 degrees.

4. The flow meter is only affected by dynamic targets. When the channel is hardened and there are no weeds or trees, even if the beam irradiates both sides of the channel, it will not affect the flow measurement.