The structure and parameter characteristics of electromagnetic flowmeter


Electromagnetic flowmeter generally consists of four parts: measuring tube, excitation system, detection part, and transmission part.

Considering the requirements of anti-corrosion, lining materials are generally added inside the measuring tube. The excitation methods of the electromagnetic flowmeter mainly include high-frequency excitation, low-frequency excitation, and pulse DC excitation. Due to the continuous development of industry, some manufacturers have adopted a new excitation method - dual-frequency excitation, which overcomes the shortcomings of high-frequency and low-frequency excitation, and has the characteristics of "not affected by flow noise", "fast response speed" and "high precision"."

The detection part mainly includes the electrode and the interference adjustment part. Since the electrode is in direct contact with the measured medium, it must have strong corrosion resistance.

The main function of the transmitter is to convert the sensor signal into a standard signal output (0~20mA, 4~20mA, 0~10KHz) proportional to the medium volume flow. And it must have high stability, precision and strong anti-interference ability.

Main performance parameters and characteristics of electromagnetic flowmeter

  1. There are no moving parts and bluffs in the measuring conduit, so there is no pressure loss, no mechanical inertia, and the response is very sensitive.

  2. The measurement range is wide, and the turndown ratio is generally 10:1 and can be up to 100:1. The flow rate can be extended to 0.3 ~ 10m/s. The flow range can be measured from tens of milliliters to hundreds of thousands of cubic meters per hour. Measuring pipe diameter can be from 2mm to 2000mm.

  3. It can measure the volume flow of liquids with certain conductivity, such as solid particles, suspended matter, or acid, alkali, and salt solutions; two-way measurement is also possible.

  4. E and Q are in a linear relationship, so the meter has a uniform scale, and the volume flow of the fluid has nothing to do with the physical properties of the medium (temperature, pressure, density, viscosity, etc.) and flow state, so the electromagnetic flowmeter only needs to be calibrated with water. To measure the volume flow of other conductive media without correction.

Electromagnetic Flow Meter

Electromagnetic flow meters are intended for fluid measurement in most industries including water, wastewater, food and beverage, pharmaceutical and chemical.

There are two basic components of electromagnetic flow meter: 

1) The Detector, which includes the flow tube, isolating liner and measuring electrodes, and 

2) The Converter, which is the electronic device responsible for signal processing, flow calculation, display and output signals.

The materials of construction of the wetted parts (liner and electrodes) should be appropriate for the specifications on the intended type of service. Review of the compatibilities consistent with the specifications is recommended.

Our electromagnetic flow meters are factory tested and calibrated. A calibration certificate is included in the shipment of each meter.

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