The open channel flow meter for water is used with the corresponding Parshall flume to measure the liquid level using the propagation law in the air, and continuously transmit the liquid level information to the host. The host automatically measures the instantaneous flow and cumulative flow through the calculation system and stores it. The ultrasonic open channel flow meter uses a professional dustproof and waterproof shell, which is corrosion-resistant and moisture-proof, and can be installed outdoors for long-term use.

Specification

Dimension (Unit: mm)

Symbol explanation: B is the throat width, B1 is the water inlet channel width, B2 is the water outlet channel width, L is the throat length, L1 is the contraction section, and L2 is the diffusion section.

Weir construction and use conditions: B>=B, H/P<2.5, H>0.03M, P>0.1M

Parshall Flume Selection

Applications

Tips: FAQ of the flow meter

• Large measurement error: Common reasons for large measurement error of flow meter include improper installation, medium change, wrong parameter setting and sensor aging. Solutions include ensuring sufficient straight pipe section, adding a bubble separator or filter, recalibrating parameters, and regularly maintaining sensors to improve measurement accuracy.
• No signal or unstable signal: No signal or unstable signal may be caused by a power supply problem, wiring failure, electromagnetic interference or medium not meeting requirements. The solution is to check the power supply and grounding, use shielded cable to reduce interference, avoid strong electromagnetic field equipment, and ensure that the physical properties of the medium meet the working conditions of the flow meter.
• Large reading fluctuation: Reading fluctuation is usually caused by abnormal flow state, sensor failure or signal processing problem. The measurement data can be stabilized by increasing the damping time to smooth the signal, improving the pipeline flow state or cleaning the sensor surface (such as removing condensation or dirt).
• Communication failure: Communication failure is usually caused by protocol mismatch (such as MODBUS address error), the RS485 line is too long or the terminal resistor is not connected. Solutions include checking the communication protocol and baud rate settings, shortening the communication line distance, and adding a 120Ω terminal resistor at the end of the bus to ensure stable signal transmission.
• Poor environmental adaptability: The flow meter may fail in extreme temperature environments, such as high temperature causing damage to electronic components or low temperature causing icing. Solutions include choosing a high protection level (IP68) or a split design (high high-temperature occasions), and adding insulation or heating devices in cold environments to ensure normal operation of the equipment.