Doppler ultrasonic flow switch DFS 5.1


Doppler ultrasonic
for water, for oil, for chemicals, for abrasive fluids, for high-viscosity liquids, for slurry, for wastewater
Other characteristics
non-invasive, non-contact, clamp-on, with LED display
process, for the food industry


The Greyline DFS 5.1 Doppler Flow Switch With Non-Contacting Sensor is ideal for pump protection or to activate flow/no-flow alarms. Recommended for “difficult liquids” including wastewater, cooling water, slurries, sludge, chemicals, viscous liquids, and abrasives. The Greyline DFS 5.1 control relay 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 10 ft/s). Insert two links for separate ON/OFF set points or just one link for a Hi or Lo flow alarm. Set the relay actuation time delay from 0 to 80 seconds. The clamp-on ultrasonic sensor mounts on the outside of metal or plastic pipes without cutting the pipe or shutting down flow. It works on any pipe diameter 12.5 mm (0.5 in) or larger and installs in minutes. There are no moving parts and no maintenance is required. Flow Control from the Outside of Metal or Plastic Pipes 5 A DPDT Control Relay Adjustable ON/OFF Set-Points Hi or Lo Flow Alarm Mode Adjustable Time Delay Relay Status LED Flow Rate LED bar graph Enclosure – NEMA4X (IP 67) polycarbonate with a clear shatter-proof face Power Input – 100-240 V AC 50/60 Hz (±10%), 2 W Control Relay – 5-ampere DPDT Set Points – ON/OFF adjustment from 0.075 m/s to 3 m/s (0.25 ft/s to 10 ft/s) Pipe Size – Any pipe ID from 12.5 mm to 4.5 m (0.5 in to 180 in) Operating Temperature (Electronics) – -23 °C to 60 °C (-10 °F to 140 °F) Accuracy – ±2%, requires solids or bubbles minimum size of 100 microns, minimum concentration 75 ppm. Repeatability: ±0.1% Shipping Weight – 3.6 kg (8 lbs)