Electromagnetic Open Channel Flowmeter

Product Manual

The AN-EMFA electromagnetic open channel flowmeter is an intelligent electromagnetic instrument that directly measures the average flow velocity of the cross-section. It delivers reliable flow measurement solutions for various harsh working conditions, and is applicable to both regular and irregular channels.

This product is widely used for flow detection in rectangular and trapezoidal open channels, culverts of reservoirs, rivers, water conservancy projects, urban water supply, sewage treatment, farmland irrigation and water resource management.

A local excitation system is arranged beside the fluid to generate a vertical magnetic field. When water flows and cuts the magnetic field, an electric potential difference is produced. This potential difference reflects the overall electric potential of all fluid particles on the cross-section, so the measured value is the average flow velocity.

The instantaneous flow rate is calculated by multiplying the average velocity by the cross-sectional area of the channel. Since the cross-sectional area is determined by water level, the meter works with radar or ultrasonic level gauges to acquire water depth data for complete flow calculation.

n Measures liquid level, average flow velocity and cumulative flow simultaneously.

n Adopts sophisticated mathematical models and multi-electrode automatic tracking technology to achieve accurate velocity measurement for various channel cross-sections.

n Measurement is immune to floating debris, sediment concentration, water level fluctuation and temperature change.

n Easy sensor installation; no channel reconstruction required, with low construction difficulty and cost.

n The display screen can show water level, cross-section average velocity, instantaneous flow and gate opening at the same time.

n Supports permanent data storage; parameters and flow data can be retained even after long-term power outage.

n Equipped with standard RS485 interface (Modbus RTU) and dual analog input ports for flexible system matching.

Flow Velocity Range：0.01 ～ 10 m/s

Velocity Measurement Accuracy：±0.5%

Water Level Range：0 ～ 10 m

Water Level Accuracy：±3 mm

Overall System Accuracy：≤±2.5%

Sensor Protection Class：IP68

Converter Protection Class：IP65

Communication：RS485, Modbus RTU Protocol

Power Supply：3.6 V / 12 V / 24 V / 220 V

Max. Velocity Display Value：19.999

Max. Cumulative Flow Display Value：9999999999

Power Consumption：＜5 W

Standard Sensor Cable Length：10 m