Greyline Instruments Greyline DFS 5.1 Doppler Flow Switch p/n# DFS 5.1 Greyline DFS 5.1 Doppler Flow Switch, NEMA 4X (IP 67) Polycarbonate Clear Shatter-Proof Face, Sensor.. Product #: DFS 5.1 Regular price: $895.00 $895.00 Pre-Order

Greyline DFS 5.1 Doppler Flow Switch p/n# DFS 5.1


Product Code: DFS 5.1
Availability: Pre-Order
- Datasheet
- Installation Manual

The DFS 5.1 Doppler Flow Switch is designed to give basic process control for pipe flow measurement, recommended for difficult liquids including wastewater, cooling water, slurries, sludge, chemicals, viscous liquids, and abrasives that would usually damage contacting Doppler flow switches. The non-contacting ultrasonic sensor mounts to the outside of metal or plastic pipes, without the need to cut the pipe or shut down the flow of your process, increasing your efficiency and ultimate profitability. With no maintenance required for the Doppler flow switch, it works on any pipe diameter 12.5 mm (0.5 in) or larger and installs in just minutes. 

The relays in the DFS 5.1 can be set to turn ON and OFF at any flow rate between 0.075 m/s to 3 m/s (0.25 ft/s and 9.8 ft/s) in addition, the end-user could inset two links for separate ON/OFF set points or just one link for a high or low flow alarm.


  • Flow Control from the Outside of Metal or Plastic Pipes

  • 5 A DPDT Control Relay

  • Adjustable ON/OFF Set-Points

  • High or Low Flow Alarm Mode

  • Adjustable Time Delay

  • Relay Status LED

  • Flow Rate LED bar graph

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