Doppler ultrasonic flow meter Greyline DFM 6.1
for waterfor chemicalsfor wastewater

Doppler ultrasonic flow meter
Doppler ultrasonic flow meter
Doppler ultrasonic flow meter
Doppler ultrasonic flow meter
Doppler ultrasonic flow meter
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Doppler ultrasonic
for water, for chemicals, for wastewater, for corrosive fluids, for slurry, for abrasive fluids, rainwater
clamp-on, wall-mounted
stainless steel
4-20 mA, analog output
Supply voltage
Protection level
intrinsically safe, IP66
for the beverage industry, industrial, for the pharmaceutical industry, for the food industry, for water treatment, for wastewater treatment, for the petrochemical industry, for high flow rates, laboratory, for the oil and gas industry, irrigation
Other characteristics
digital, with display, direct-reading, programmable, with data logger, non-contact, with alarm function, with indicator-totalizer, maintenance-free
Process pressure

Max.: 10 psi

Min.: 0 psi

Process temperature

Max.: 60 °C (140 °F)

Min.: -23 °C (-9 °F)

Volumetric flow rate

Max.: 0 m³/s (430.8 ft³/s)

Min.: 0 m³/s (0 ft³/s)


The Greyline DFM 6.1 is designed to measure flow from outside a pipe for "difficult liquids" that would damage regular flow meters - wastewater, slurries, sludge, chemicals, viscous liquids, and abrasives. There is no obstruction to flow and no pressure drop. The non-intrusive, clamp-on ultrasonic sensor fits any pipe 12.5 mm (0.5 in) Inside Diameter or larger. The Greyline DFM 6.1 features enhanced performance in a wide range of applications. Improved industrial noise immunity filters potential interference sources. Use the isolated 4-20 mA output to transmit flow to remote displays, recorders, or controllers. The programmable relays can be used for flow control, pump protection, or flow proportionate pulse. A 128 MB data logger is standard, capable of capturing up to 26 million data points. Enhanced Performance Easy to Install and Configure Non-Contacting Clamp-On Ultrasonic Sensor Works on a Large Variety of Pipe Materials and Sizes Large Back-lit Flow Rate Display and Totalizer Isolated 4-20 mA Output 2 Programmable Control Relays Optional MODBUS RTU or HART Output 128 MB Data Logger (26 million points) Flow Rate Range - ± 0.03 m/s to 12.2 m/s (± 0.1 ft/s to 40 ft/s) in most applications Pipe Size - Any pipe ID from 12.7 mm to 4.5 m (0.5 in to 180 in) Accuracy - ±2% of reading or 0.03 m/s (0.1 ft/s) whichever is greater. Requires solids or bubbles minimum size of 100 microns, minimum concentration 75 ppm. Repeatability: ±0.1%, Linearity ±0.5% Display - White, backlit matrix - displays flow rate, relay states, 16-digit totalizer, operating mode, and calibration menu


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