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Electromagnetic Flow Switch and Flow Meter

For measuring electrically-conductive liquids, pastes and slurries
Optional digital display
No moving parts, maintenance-free

The DWM 1000 electromagnetic flow switch and the DWM 2000 electromagnetic flow meter monitor the flow of electrically-conductive liquids, pastes and slurries.

The DWM 1000 uses an induced voltage converted into a switching signal.

The DWM 2000 uses an induced voltage converted into a 4...20 mA current output that is proportional to the flow velocity.

Highlights

DIP switch for setting full-scale value
Zero calibration button removes zero drift
Long version available for pipes larger than 400 mm / 16" in diameter
Optional ball valve for long version
Rugged design, IP66 (NEMA 4/4X) protection
IP 68 version available for immersed applications
Suitable for process temperatures up to 150°C / 300°F and process pressures up to 25 bar / 360 psig
Optional digital display for DWM 2000 meters
Suitable for AC and DC electrical circuits (relays available for the DWM 1000)
Optional spool pieces for pipe diameters DN25...50 or 1"...2"
Optional fitting for Tuchenhagen VARIVENT® housings
Housing is removable or rotatable under process conditions

Industries

Petrochemical
Oil & Gas
Chemical
Food & beverage
Water
Air conditioning (HVAC)

Applications

Flow detection
Cooling systems
Pump protection

Measuring principle

As early as 1832, Faraday tried to determine the speed of the current in the Thames by measuring the voltage induced in flowing water by the earth’s magnetic field. Electromagnetic flow measurement is based on Faraday’s Law of induction. According to this law, a specific voltage is induced in a conductor or conductive medium that moves through a magnetic field. This voltage is proportional to the speed of movement of the medium. On electromagnetic flowmeters, the induced voltage is tapped via two measuring electrodes in conducting contact with the medium. An electronic converter converts the signal into a proportional output signal.