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Introduction
The electromagnetic flowmeter uses Faraday’s electromagnetic induction principle to measure the flow of conductive liquids in closed pipelines, including those in flammable or explosive environments. It provides outputs such as standard current, pulse, and RS485 digital signals for monitoring, recording, and process control, enabling automated measurement. The flowmeter is applicable in industries like water supply, chemical, coal, environmental protection, textiles, metallurgy, and paper production.
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Specification
| Product | Explosion-Proof Electromagnetic Flowmeter |
| Model | SIN-LDG-A100D |
| Velocity of flow | Typically Velocity of flow: 0.5m/s~5m/s |
| Flow range | 0.32m³/h~1270m³/h |
| Nominal diameter | DN15~DN300 |
| Ex symbol | Ex db ib IIC T6...T4 Gb |
| Current output | (4~20)mA, 24VDC,≤750Ω |
| Pulse output | Fmax ≤ 5000 cp/s Output pulse width: 0.1ms~2000ms ( This value is lower than the maximum duty cycle, with a maximum duty cycle of 1:1 Fmax ≤ 5000 cp/s ) |
| Communications | RS485, MODBUS-RTU, Hart (optional) |
| Supply voltage | 100VAC~230VAC，50/60Hz； 20VDC~28VDC |
| Power consumption | ≤15W |
| Accuracy | Measurement value±0.5%(Flow velocity 0.5m/s~5m/s) |
| Conductivity | ≥50μS/cm |
| Pressure rating | DN15~DN250：PN<1.6MPa DN300: PN<1.0MPa (High pressure can be customized) |
| Ambient temperature | -10℃~55℃ |
| Ingress protection | IP65 |
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Measuring principle
The operating principle of electromagnetic flowmeter is based on 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 can be detected between the left and right electrodes on the wall of the flowmeter tube. The magnitude of the induced electromotive force is proportional to the electrically conductive medium flow rate, the magnetic induction density of the magnetic field, and the width of the conductor (the inner diameter of the flowmeter measuring tube), and the flow rate of the medium can be obtained by calculation. The induced electromotive force equation is as follows:
E=K×B×V×D
Where: E－Induced electromotive force
K－Meter constant
B－Magnetic induction density
V－Average flow speed in cross-section of measuring tube
D－Inner diameter of measuring tube
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Features
- Explosion-Proof Certification: Passed various universal explosion-proof (Ex) certifications.
- Measurement Reliability: Reliable measurement, high accuracy, and good stability.
- Integrated Design: Integrated structure, no moving parts, easy to install, maintenance-free.
- Communication Interface: RS485 communication interface - standard Modbus RTU protocol.
- Excitation Technology: Adopting advanced low-frequency square wave excitation, zero point stability, strong anti-interference ability, and reliable operation.
- Bidirectional Measurement: It is not affected by the direction of the fluid and can be accurately measuredin both directions.
- Touch Operation: Touch the button, no need to open the lid.
- Display Orientation: The orientation of the header/display interface can be adjusted for easy reading.
- Multi-Language Support: Supporting five languages and free switching: Chinese, English, Korean, Russian and Spanish.
