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Technical Specifications
| Measuring Principle | Faraday's law of electromagnetic induction | |
| Function | Instantaneous flow, flow velocity, mass flow (when the density is constant), real-time measurement, and flow accumulation | |
| Module Configuration | Measurement system is made up of signal converter and measurement sensor | |
| Nominal Diameter | DN10~DN1000 | |
| Pressure Rating (High pressure can be customized) | DN15 - DN250, PN≤1.6MPa | |
| DN300- DN1000, PN≤1.0MPa | ||
| Lining Material | PTFE, CR, PU, FEP (F46) | |
| Electrode Material | 316L Stainless Steel, Hastelloy C, Hastelloy B, Titanium, Tantalum, Pt-Ir Alloy | |
| Protection Degree | Integrated type: IP68 | Remote type: IP65 |
| Medium Temperature | Neoprene(CR): -10℃ ~ 70℃ Polyurethane(PU): -10℃~ 60℃ PTFE: -10℃~ 120℃ FEP: -10℃~ 120℃ | |
| Port Communications | Modbus RS-485 | |
| Output | Current (4~20 mA), pulse, frequency | |
| Function | Empty pipe alarm, excitation current alarm, upper limit alarm, lower limit alarm | |
| Accuracy | Measurement value ±0.5%; Measurement value ±0.3% (Some diameter are selectable) Note: flow velocity: 0.5m/s-5m/s | |
| Repeatability | ≤0.16% | |
| Environment Temperature | -20℃ - 55℃ | |
| Storage Temperature | -40℃ - 55℃ | |
| Conductivity | Water | Min. 20μS/cm |
| Other | Min. 5μS/cm | |
| Power supply | 220V AC, 24V DC,12V DC (Low power consumption) | |
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Applications
The FMC240 is suitable for flow measurement and control in a wide range of industries including:
Water supply and wastewater treatment – accurate monitoring of clean and wastewater streams.
Chemical processing – measurement of conductive chemicals, acids and alkalis.
Environmental systems – integration with SCADA/automation for remote monitoring.
Industrial utilities – plant water, cooling circuits and process films.
Food & beverage (sanitary or adapted versions available) – precise flow measurement in production lines.
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Measuring principle
The operating principle of electromagnetic flowmeter is Faraday's law of electromagnetic induction. The two electromagnetic coils at the upper and lower ends as shown in Figure 3 generate a constant or alternating magnetic field. When the conductive medium flows through the electromagnetic flowmeter, the induced electromotive force (E) can be detected between the left and right electrodes on the wall of the flowmeter tube.
The induced electromotive force (voltage) is proportional to the velocity (V) of the conducive flow, the density of the magnetic field(B), and the length of the conductor(D). The volumetric flow can be determined by calculation, and the formula of induced electromotive force(induced emf voltage)for calculation is:
E=K×B×V×D
Where: E－Induced electromotive force
K－Meter Tube Constant
B－Magnetic Flux Density
V－Average Flow Velocity
D－Electrode Spacing
When measuring the volumetric flow, conductive flow passes through a magnetic field that is perpendicular to the flow direction. This induces an electric potential proportional to the average flow velocity. Therefore, the measured fluid must have an electrical conductivity higher than the minimum threshold of 5μs/cm. [In theory, an electromagnetic flowmeter can measure conductive media with conductivity
exceeding 5μs/cm. However, in actual measurements, it is supposed to be applied where the measured medium's conductivity is at least 30μs/cm (one to two units≥the theoretical limit). Additionally, the conductivity value must be based on online measured conductivity value].
The induced voltage signal is detected by two electrodes, and transmitted to the converter via coils. After a series of analog and digital signal processing, the totalized flow and instantaneous flow are displayed on the converter’s screen.
