Vner

MWDC-LDG series

An electromagnetic flowmeter consists of two main components: the sensor and the converter. This device functions on the basis of Faraday's law of electromagnetic induction and is used to measure the flow of conductive liquids. It is widely used across various industries, including metallurgy, chemical, paper and pulp, environmental protection, petroleum, textile, food and beverage, municipal management, and water conservancy construction.

The sensor generates a magnetic field, which induces a voltage in the conductive liquid, while the converter converts the voltage signal into a flow rate. As a result, the electromagnetic flowmeter provides accurate and reliable readings, enabling precise measurements in various industrial applications.

The electromagnetic flowmeter uses Faraday's Law of electromagnetic induction to measure the process flow. When an electrically conductive fluid flows in the pipe, an electrode voltage E is induced between a pair of electrodes placed at right angles to the direction of magnetic field. The electrode voltage E is directly proportional to the average fluid velocity V.

The sensor is designed to perceive induced electrode voltage E as an indication of flow and relay this signal to the converter. Upon receipt, the converter amplifies the signal, converts it into a digital format, and filters it to eliminate noise. The resulting data is processed digitally and displayed on a backlit dot-matrix LCD screen as instantaneous flow and cumulative flow.

Furthermore, the converter boasts a 4-20mA output, an alarm output, and a frequency output. In addition, it is equipped with communication interfaces such as RS-485 and supports the HART and MODBUS protocols.

E=B·V·F·K E - Induced Electrode Voltage
K - Coefficients related to magnetic field distribution and axial length) B - Magnetic Flux Density
V - Velocity D - Inner Width Between Electrodes

Accurate and reliable measurement unaffected by changes in fluid density, viscosity, temperature, pressure, and conductivity.
Highly adaptable to slurry measurement with no flow blocking parts, no pressure loss, and reduced straight pipe section requirements.
Excellent corrosion and wear resistance with reasonably selected electrodes and lining materials.
Full digital volume processing, strong anti-interference ability, and high precision.
Efficient and reliable Ultra-low EMI switching power supply.
Fast operation speed with a 16-bit embedded microprocessor, low power consumption, and high circuit reliability with SMD devices and SMT technology.
Excellent corrosion and wear resistance with reasonably selected electrodes and lining materials.

Adaptable to different scenarios with online range modification.
Convenient and user-friendly with a high-definition backlit LCD display, full Chinese menu operation, and various digital communication signal output options.
It comes with RS485, RS232, Hart, and Modbus Profibus-DP digital communication signal output (optional).
Troubleshooting and diagnosis made easy with a self-test and self-diagnosis function (optional).
Efficient and reliable Ultra-low EMI switching power supply.
Efficient with hourly total recording function and internal power-down clock that can record 16 times the power-down time (optional).
Highly convenient and user-friendly with an infrared handheld operator, 115KHZ communication rate and remote non-contact operation of all functions of the converter (optional).

Avoid installing any objects near the flow tube that may interfere with its magnetic field, induce signal voltage, or disrupt its flow field distribution.

Require a straight pipe section of 5D upstream and 3D downstream, and increase the length of straight pipe section if elbows, valves, or other flow-disturbing components are present.
Install a valve at the downstream end of the flow measurement tube to prevent flow fluctuations and inaccurate measurements caused by an empty tube. Ensure the valve is correctly installed and calibrated according to the manufacturer's instructions and industry standards.
Maintain stable fluid conductivity. Avoid installing the flowmeter in a location where the fluid conductivity is not uniform. If chemicals are injected near the upstream end of the electromagnetic flowmeter, the flow rate display may be affected. To avoid this, it is recommended that the injection of chemicals be rerouted to the downstream end of the flowmeter. If injection must be made from the upstream end, use a straight section of pipe long enough (approx.50D) to ensure that the fluid is well mixed with the chemical.