CHANNEL FLOW MANAGEMENT
Method
Based on Faraday’s Law, a voltage is induced when a conductor moves through an electromagnetic field. By constructing a tube with magnetic coils, a non-conductive lining, and two electrodes, you can measure the flow of conductive liquids by monitoring this induced voltage. This measurement method is non-intrusive, with no obstruction to the pipework.
Advantages
- Highly accurate
- Minimal pressure drops
- Ideal for applications with suspended solids or slurries, as no parts are extending into the flow path
- Available in various linings and electrode materials for compatibility with nearly any process
Disadvantages
- Cannot detect the flow of non-conductive liquids like fuels or oils
- Low-conductivity liquids may require a capacitive flowmeter, which is more expensive
- Costs rise significantly with increasing pipe size
Features and Options
To accommodate a wide range of applications, magnetic flowmeters offer various materials for linings, electrodes, and earthing rings. For acidic environments, tantalum or titanium electrodes paired with PTFE (Teflon) linings are suitable. For abrasive liquids with large solids, ceramic linings are available, providing resistance to aggressive chemicals and abrasion.
Magnetic flowmeters typically offer multiple output options, including standard analog signals (e.g., 4-20mA) and pulse signals for flow counting or totalisation during batches. Many units can also display the total amount of liquid on their display. Remote versions, where the electronics are separate from the flow sensor, are also available.