UF DFS- 200 Fixed Doppler Flow Switch



  • SE4 sensor – clamp-on ultrasonic for 0.5-180” ID pipes
  • Sensor cable – 20 ft shielded coaxial pair
  • Installation – Silicone coupling compound
  • Stainless steel Pipe Clamp Kit for 0.5-16”  OD pipes
  • Enclosure – water/dust-tight NEMA4X polycarbonate
  • 1 Relay – 5 ampere DPDT
  • Set point – On/Off adjustment 0.25 – 10 ft/sec
  • Relay time delay – adjustable, 0-80 seconds
  • Indication – Relay LED, Flow rate LED Bar Graph
  • Power input – 100-240VAC 50-60Hz
  • 1 Manual – Installation and Operation




Fixed Doppler Flow Switch with Non-Contacting Sensor

  • Installs in Minutes
  • No moving parts
  • Ideal for “difficult” liquids
  • No contact, No maintenance
  • Easy Calibration

Mount the fixed doppler flow switch on the outside of metal or plastic pipes.  The sensor continuously injects high frequency sound through the pipe wall and into the moving fluid where acoustic pulses are reflected back to the sensor from particles or bubbles in the fluid.  Flow rates of most liquids can be accurately controlled including acids, caustics, lubrication fluids, chemicals, abrasives, waste water and sludge. There are no moving parts and no sensor maintenance is required.  The compact, water tight electronics enclosure includes adjustable controls with separate ON and OFF relay set-points and time delay. A LED bar graph for flow rate and set points plus relay status are included.  Installation can be made while the flow system is in full operation. No contact is made with the moving fluid and no holes are drilled in the pipe. There is no fouling or scale build-up on the sensor.

  • Sewage
  • Viscous liquids
  • Acids
  • Slurries
  • Solvents
  • Treated wastewater
  • Sludge
  • Pulp stock
  • Food products
  • Oils
  • Paint
  • Chemicals
  • Aerated Water
  • Cooling Water

Additional information

Weight 8 lbs
Dimensions 10 × 12 × 4 in
DFS-200 Power

A: Standard 100-240VAC 50/60Hz, B: 12-24VDC

DFS-200 Sensor

1: SE4 standard clamp-on Sensor (for 0.5” / 12.5 mm to 180” (4.5 m) ID pipes

DFS-200 Sensor Cable Length

A: Standard 20 ft / 6 m shielded coaxial cable, B: 50 ft / 15 m continuous shielded coaxial pair, C: 100 ft / 30 m continuous shielded coaxial pair