DFM 6.1 Doppler Flow Meter

The DFM 6.1 Doppler Flow Meter from Pulsar Measurement accurately measures the flow rate of ‘complex’ fluids with suspended solids or entrained air. This clamp-on, ultrasonic non-contacting, flow meter measures flow from outside a pipe with no contact with process fluid.

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Advantages

Doppler technology sends a signal through the pipe wall and is reflected off the particles within the liquid, the change in frequency is reflected on the controller in the form of pipe flow measurement
Ideal to monitor flow for ‘difficult’ liquids, or liquids with suspended solids such as wastewater, slurries, sludge, chemicals, viscous liquids, and abrasives
Clamps on the outside of any pipe 12.5 mm inside diameter or larger
Obtains flow measurement readings without interrupting the process
Easy-to-follow, 5-button menu keypad to make setting up quick and easy
Works on the majority of pipe materials

DFM 6.1 Doppler Flow Meter

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DFM 6.1 Doppler Flow Meter Equipment Options:

Specifications

General Specifications

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

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

Options

Sensors

Intrinsic safety barriers for installation in Class I, Div 1, Groups C, D; Class II, Groups E, F, G; Class III; Encl. Type 4 hazardous locations.

Industrial Automation Protocols

Modbus RTU via RS-485 or HART (field selectable)

Sensor Cable

15 m (50 ft) or 30 m (100 ft) continuous shielded coaxial pair, or splice up to 500 ft (152 m) with junction box. Self tunes to extended cable.

Enclosure Heater

For outdoor installation, thermostatically controlled to -40 °C (-40 °F)

Control Relays

4 additional (6 total) rated 5 A SPDT

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