Magnetic Flowmeter
What Is an Electromagnetic Flowmeter?
- An electromagnetic flowmeter (also known as a mag meter) is a type of flow measurement device.
- Its primary function is to measure the flow rate of conductive liquids (such as water, slurries, or chemicals) by utilizing electromagnetic principles.
- Unlike other flowmeters, it doesn’t have moving parts or obstructions within the flow path.
French engineer G.G. Coriolis first noted this effect, which plays a role in ocean tides, weather patterns, and now—flow measurement!
How Does It Work?
- The key principle behind electromagnetic flowmeters is Faraday’s law of electromagnetic induction.
- A magnetic field is generated across the flow tube (usually made of non-conductive material).
- When the conductive fluid flows through the tube, it cuts across the magnetic lines of force.
- According to Faraday’s law, this movement induces a voltage across electrodes placed on the tube walls.
- The induced voltage is directly proportional to the flow velocity and, consequently, the flow rate.
- French engineer G.G. Coriolis first noted this effect, which plays a role in ocean tides, weather patterns, and now—flow measurement!
Features and Advantages:
- Accuracy: Electromagnetic flowmeters provide high accuracy, especially for conductive fluids.
- Wide Range: Suitable for various flow rates—from low to high.
- No Moving Parts: Minimal maintenance and no mechanical wear.
- Bi-Directional Measurement: Measures flow in both directions.
- Non-Intrusive: No obstruction in the flow path.
This force causes a phase shift, which correlates directly with the mass flow rate.
Applications:
- Water Management: Used in water treatment plants, distribution networks, and sewage systems.
- Chemical Industry: Monitoring corrosive liquids and chemical processes.
- Food and Beverage: Measuring flow in beverage production, dairy processing, etc.
- Pulp and Paper: Monitoring pulp slurries and paper stock. NM
| Fluid Types | ADMAG Total Insight | CA Series |
|---|---|---|
| Corrosive | A | A |
| Slurry | A | A |
| Adhesion | B | A |
| Low Conductivity | B | A |
A: Usable, B: Usable period may be short
| ADMAG Total Insight | CA Series | |
|---|---|---|
| Measurable Conductivity | Above 1 μS/cm | Above 0.01 μS/cm |
| Electrode Type | Wetted type | Capacity type |
| Accuracy (Reading Value) | ADMAG AXG ± 0.3 % ADMAG AXW ± 0.35 % | ± 0.5 % |
| Size | ADMAG AXG 2.5 to 500 mm ADMAG AXW 25 to 1,800 mm | 15 to 200 mm |
| Wiring | 4-wires | 4-wires |
| Communication Protocol | HART 7, BRAIN, Modbus, FOUNDATION Fieldbus, PROFIBUS PA, EtherNet / IP | HART 7 |
| Diagnostic Function | Application Diagnostic – Flow Noise Diagnosis – Low Conductivity Diagnosis – Electrode Insulation Deterioration Diagnosis – Electrode Adhesion Detection – Sensor Empty Check – Wiring Connection Diagnosis Verification Function – Built-in/Standard/ – Enhanced Verification |
Protuct Option
ADMAG AXG
The ADMAG TI series AXG is ideal for industrial process lines like oil & gas/chemical/pulp & paper/food & beverage/metal & mining applications. With outstanding reliability and ease of operation and maintenance, developed on decades of field-proven experience, the AXG will increase user benefits while reducing total cost of ownership.
ADMAG AXW
The ADMAG TI series AXW is ideal for general industrial process lines and water supply/sewage applications. The sizes are available from 25 mm to 1800 mm. Besides fluorocarbon PTFE, lining can be selected from various rubber linings.
Magnetic Flowmeter CA Series
The CA Series promises stable measurement even for fluids that are considered difficult to measure, such as slurry fluids and adhesive fluids. The design based on the Total Insight concept improves operability and maintainability for customers.