The open channel electromagnetic flowmeter adopts the velocity area method and does not require the construction of water measuring structures. The flow rate is obtained by measuring the cross-sectional area and cross-sectional velocity of the water passing through it. It is widely used for flow measurement in rectangular and trapezoidal open channels and culverts such as open channel water diversion, water conservancy engineering, urban water supply, sewage treatment, and agricultural irrigation.

manufacturer of open channel electromagnetic flowmeter

Product features:

1. The measurement system can measure liquid level, average flow rate, and cumulative flow rate;
2. A reasonable digital model combined with advanced process technology for automatic tracking and measurement of multiple pairs of electrodes can accurately measure different forms of cross-sectional flow velocity;
3. Wide measurement range (0.01-10m/s);
4. Measurement is not affected by floating objects, sediment content, water level changes, and temperature in the water;
5. The flow rate sensor is easy to install. The channel can be installed directly without modification, with low installation difficulty and cost;
6. Instrument display function: It can simultaneously display water level, average flow velocity of the section, instantaneous flow rate of the section, gate opening degree, etc;
7. Equipped with data saving function, it can save set parameters and flow values in the event of long-term power outage;
8. The instrument is equipped with a standard Modbus (RTU) output 485 interface and dual analog input interface for matching use.

Structure and principle of open channel electromagnetic flowmeter

Electromagnetic open channel flowmeter includes flow velocity sensor, liquid level gauge, open channel converter, and auxiliary installation structure. According to on-site requirements, solar power supply system or wireless monitoring system for open channel flow can be optionally equipped.

The electromagnetic open channel flowmeter measures the flow velocity and water level, and calculates the flow rate through an embedded processor. Flow velocity measurement is based on Faraday’s law of electromagnetic induction, and the real-time instantaneous flow velocity of an open channel is measured through a flow velocity sensor. Water level measurement can be obtained using level gauges such as ultrasonic level gauges, pressure level gauges, and float level gauges. Taking ultrasonic level gauges as an example, the ultrasonic time difference method is used to measure the real-time water level height of open channels through ultrasonic level gauges. The electromagnetic open channel flowmeter converter uses a flow correction algorithm based on the pre-set channel size and measured flow velocity and water level data to calculate the real-time instantaneous flow rate of the open channel, and displays the flow information on the LCD screen. At the same time, the flow information can be transmitted to the secondary instrument through a communication interface.

The working principle of this system is to generate a vertical local magnetic field by laying a local excitation system next to the overcurrent medium. The potential difference generated by cutting the magnetic field during water flow measurement is the collection of the potentials of all particles in the overcurrent section. So the measured flow velocity is the average flow velocity. The instantaneous flow rate of the channel can be obtained by multiplying the average flow velocity by the area of the channel cross-section. The cross-sectional area is a function of water level, and different principle forms of liquid level gauges are used to measure the water level of the cross-section. Liquid level gauges are generally composed of ultrasonic, pressure, float, and so on.