Doppler Flow Switch
Item #: DFS-II
Control Flow From Outside a Pipe
Flow Switch with Non-Contacting Sensor
Controls Flow with:
No pressure drop
No sensor fouling
Flow Sensor installs without cutting the pipe
Installs in Minutes No moving parts
Mount the DFS-II ultrasonic sensor 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.
Ideal for "difficult" liquids No contact, No maintenance
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 switch set-points, sensitivity and time delay. Indicator lights for signal strength and 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.
Easy-to-install, Automatic Flow Control
Recommended for Pump Protection and Flow Alarms
The DFS-II flow sensor installs without cutting the pipe. It takes just a few minutes to mount on the outside of any pipe. The switch/electronics enclosure can be mounted 20 ft (6 m) away from the sensor (optional up to 500 ft / 152 m) to simplify wiring to pumps, alarms, valves or other equipment.
Switch adjustments and electrical connections are fast and easy. The DFS-II relay time delay is adjustable from 0 to 60 seconds to prevent nuisance alarms and relay "chatter" in turbulent flow. Includes switch selectable "normal" and "failsafe" operating modes.
Choose DFS-II for:
- No contact with the measured liquid
- No obstruction to flow - No pressure drop
- Sensor mounts easily on the outside of the pipe
- Can be installed while pipe line is in use
- Insensitive to pressure, specific gravity and conductivity
- Does not require pipe metering sections
- Does not require consideration of material compatibility with the liquid
Repeatable, Reliable Flow Control
Use the DFS-II for pump protection, valve control and flow/no-flow alarms. It is ideal for "difficult" liquids like wastewater, slurries, abrasives and chemicals, or any liquid which contains gas bubbles or solids. The standard Sensor mounts on any pipe 1" (25mm) diameter or larger.