DFS-II Doppler Flow Switch

Greyline, DFS-II, Doppler Flow Switch, ultrasonic flow switch, Doppler flow control, outside a pipe, pump controls, pump protection, flow alarms, non-contacting, non-invasive, non-intrusive, ultrasonics, strap-on sensors, clamp-on, acoustics, entrained air, slurries, sludge, abrasives, no obstruction, no pressure drop, municipal, industrial, sewage, wastewater, DFS-11

  • Non-Contacting Ultrasonic Sensor

  • Easy Calibration

  • Accurate and Repeatable

  • 5 amp DPDT Control Relay

  • Adjustable ON/OFF Set-Points

  • Adjustable Time Delay

  • Relay Status LED

  • Intrinsic Safety Option

DFS-II Doppler Flow Switch

Control Flow from outside a pipe. Recommended for "difficult liquids" including wastewater, slurries, sludge, chemicals, viscous liquids and abrasives. The Greyline DFS-II is ideal for pump protection or to activate flow/no-flow alarms.

The non-intrusive DFS-II strap-on Sensor mounts on any pipe over 1/2" diameter without cutting the pipe or shutting down flow. It installs in minutes and requires no maintenance. Includes one 5 amp DPDT control relay with 0-60 second adjustable time delay. Bright LED indicators show relay status and signal strength. Electronics are housed in a watertight enclosure and Sensor cable is shielded and can be extended up to 500 ft. (152 m).

DFS-II Brochure
DFS-II User's Guide
Dow Corning Coupling Compound MSDS

DFS-II Engineering Specifications

How Doppler Works


Doppler Flowmeter for Display and Control...

Combine flow control with a complete flow metering solution through the Greyline DFM 5.0 Doppler Flow Meter. It displays flow rate, totalizes and includes 2 fully programmable control relays.


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