Pump protection. High- or low-flow control. Overfill alarm. Bargraph flow rate indication. Clamp-On Flow Sensor Installs Without Cutting the Pipe Installs in Minutes with No Moving Parts Mount the DFS 5.1 Doppler Flow Switch 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 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, wastewater, and sludge. There are no moving parts and no sensor maintenance is required. Easy Calibration 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. No Pipe Cutting. No Pressure Drop. No Sensor Fouling. No Maintenance! It takes just a few minutes to install and calibrate a Greyline DFS 5.1 Doppler Flow Switch. The DFS 5.1 controls flow of most liquids in closed pipes. The ultrasonic sensor mounts on the outside of any pipe from 12.7 mm to 4.6 m (0.5 in to 15 ft) I.D. THE RIGHT METER FOR • Treated Water • Sludge & Slurries • Raw Sewage • Solvents & • Viscous Liquids Chemicals • Acids • Pulp Stock • Food Products • Aerated Water • Oils & Paint • Cooling Water Easy to Calibrate The DFS 5.1 control relay can be set to turn ON and OFF at any flow rate between 80 mm/s to 3 m /s (3.1 in/s to 9.8 ft/s). Insert two links for separate ON/OFF set points or just one link for a Hi or Lo flow alarm. Set relay actuation time delay from 0 to 80 seconds.

Ideal for Pump Protection Avoid expensive pump repairs and downtime. The DFS 5.1 strap-on sensor can be installed in minutes without shutting down flow or cutting pipe. Use the adjustable relay time delay to eliminate relay “chatter” and reduce pump wear. Reliable & Repeatable Repeatability is ±0.1% of full scale (3 mm/s (0.1 in/s)). There are no moving parts and no maintenance is required. The clamp-on ultrasonic sensor cannot be damaged or fouled by contact with the liquid it measures. Sealed in a stainless steel housing, the DFS 5.1 sensor withstands moisture or accidental submersion in water...

Technical Specifications GENERAL SPECIFICATIONS Model SE4 Single-head 316SS ultrasonic, with 6 m (19.7 ft) shielded cable and stainless steel mounting Operating Temperature: (Sensor) ±2%, requires solids or bubbles minimum size of 100 microns, minimum concentration 75 ppm. Repeatability: ±0.1% Power Input: 100-240 V AC 50-60 Hz (see Popular Options), 10 VA max depending on options ON/OFF adjustment from 0.076 m/s to 3 m/s (0.25 ft/s to 9.8 ft/s) Electronics Enclosure: NEMA4X (IP66) polycarbonate with clear, shatterproof cover Control Relays: Operating Temp. (Electronics): Pipe Size: Approximate...

FLOW SWITCH DFS VIEW FACE5.1 mount drawing front and side SIDE VIEW SE4 ULTRASONIC DOPPLER SENSOR SE4 Ultrasonic Doppler Sensor Greyline DFS 5.1 Doppler Flow Switch The DFS 5.1 flow sensor can be installed without cutting the pipe and takes just a few minutes to mount the sensor on the outside, causing no interruption to flow and minimizing installation costs. The switch / electronics enclosure can be mounted 6 m (19.7 ft) away from the sensor, optional up to 152.4 m (500 ft) to simplify wiring to pumps, alarms, valves, or other equipment. Switch adjustments and electrical connections are fast...