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DFM 6.1 Doppler Flow Meter

Updated:2025-03-13

Brand: Pulsar
Model: DFM 6.1
Description: Gaining flow measurement inside a pipe can sometimes be tricky. The DFM 6.1 Doppler Flow Meter works as a non-contacting, clamp-on flow meter to offer effective clamp-on pipe flow measurement from out
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Product Details

DFM 6.1 Doppler Flow Meter Description：

User's Manual Datasheet Order Form

Gaining flow measurement inside a pipe can sometimes be tricky. The DFM 6.1 Doppler Flow Meter works as a non-contacting, clamp-on flow meter to offer effective clamp-on pipe flow measurement from outside the pipe. Its Doppler technology makes it perfect for use as a water flow meter, specifically for difficult liquids, or liquids with suspended solids such as wastewater, slurries, sludge, chemicals, viscous liquids, and abrasives. The non-invasive Doppler ultrasonic flow meter fits a pipe 12.5 mm (0.5 in) inside diameter or larger, and clamps to the outside of the pipe, gaining flow measurement readings without interrupting the process.

External Sensor No Contact, No Maintenance To measure velocity an acoustic signal is reflected to the sensor from moving particles or gas bubbles suspended in the fluid. Flow is calculated based on the configured pipe inside diameter. Installation is easy – without shutting down the flow system. No contact is made with the moving fluid, and no pipe cutting or drilling is required. There is no fouling or scale build-up on the sensor.

The easy–to–use 5-key configuration system on the DFM 6.1 Doppler Flow Meter makes setup and installation quick, simple, and easy. The unit features a large digital flow rate display with a totalizer, isolated 4-20 mA output, 26-million-point data logger, and two programmable control relays.

Reverse Flow Measurement

The DFM 6.1 Doppler Flow Meter measures flow in either direction and will display positive or negative values. You can control the totalizer to subtract reverse flow or to totalize forward flow only.

Use Doppler pipe flow measurement devices to control flow within a process, protect pumps from no-flow or dry pumping, or for flow proportionate use. You can even use it to test existing equipment to ensure it's still providing accurate pipe flow measurement.

Features

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 4-20mA output

2 Programmable control relays

Optional Modbus RTU or HART output

128 MB data logger (26 million points)

Specifications

General Specifications
Spec name:	Description:
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
Configuration	Built-in 5-button keypad with English, French, or Spanish language selection
Power Input	100-240 V AC 50/60 Hz, 10 VA maximum Optional: 9-32 V DC, 10 W maximum
Output	Isolated 4-20mA (1000 ohm load max.) or 0-5 V DC (field selectable)
Control Relays	Qty 2, rated 5 amp SPDT, programmable flow alarm, and/or proportional pulse
Data Logger	Built-in 26 million point logger with a USB output and Windows software
Enclosure Heater	NEMA4X (IP 66) polyester with a clear polycarbonate face
Operating Temperature (Electronics)	-23 °C to 60 °C (-10 °F to 140 °F)
Shipping Weight	6.3 kg (14 lbs)

Sensor Specifications
Spec name:	Description:
Model SE4	Single-head ultrasonic with 7.6 m (25 ft) shielded cable and stainless steel mounting kit for pipes 12.7 mm (0.5 in) ID or larger. Designed to withstand accidental submersion to 10 psi. Certified non-incendive for Class I Division 2, Groups A, B, C, D hazardous locations
Operating Temperature	-40 °C to 150 °C (-40 °F to 300 °F)
Exposed Materials	316SS
Hazardous Locations	Certified Non-incendive for Class I, Div 2, Groups A, B, C, D Optional: Certified Intrinsically safe for Class I, Div 1, Groups C, D; Class II, Groups E, F, G; Class III; Encl. Type 4 Optional: Certified Intrinsically safe for sensor mounting in ATEX.IECEx Zone 0, Ex ia IIB T4 Ga, hazardous location