| Doppler Flow Meter, Ultrasonic (Model DFM-IV) |
| Manufacturer: Greyline |
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Non-Contacting Ultrasonic Sensor
Large, 4-Digit LCD Display
10-Digit Totalizer
Isolated 4-20mA (1000 ohm)
3 Programmable Control Relays
Adjustable Sensitivity
Intrinsically Safe Sensor Option
Built-in 3-Key Calibrator
RFI Rejection Filters |
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Measure flow from outside a pipe. The Greyline DFM-IV is ideal 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 standard, strap-on ultrasonic sensor fits any pipe 1/2" (12.5 mm) Inside Diameter or larger. The electronics/display enclosure can be mounted nearby.
Use the isolated 4-20mA to transmit flow to remote displays, recorders or controllers. The 3 programmable relays can be used for flow control, pump protection or flow proportionate pulse. Calibration is easy with the built-in 3-key calibrator. Display and totalize flow in your choice of engineering units (gallons, liters etc.)
Sensor cable can be extended up to 500 ft. (152 m) with no loss of signal. The DFM-IV can be equipped with intrinsic safety barriers for sensor installation in hazardous rated locations. Other options include high temperature sensors, dual-head sensors and a built-in 50,000 point Data Logger.
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How it works...Doppler Flow
Doppler flow meters measure flow from outside a pipe with a strap-on sensor. Greyline Doppler meters continuously transmit high frequency sound (640 kHz) that travels through the pipe wall and into the flowing liquid. Sound is reflected back to the sensor from solids or bubbles in the fluid. If the fluid is in motion, the echoes return at an altered frequency proportionate to flow velocity. Doppler flow meters continuously measure this frequency shift to calculate flow.
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| The Doppler effect was first documented in 1842 by Christian Doppler, an Austrian physicist. We hear everyday examples of Doppler: the sound of a train whistle changing pitch as it passes by, or the exhaust noise from a race car as it speeds past our location.
The Doppler technique only works on liquids which contain solids or gas bubbles to reflect its signal. These are "difficult" liquids that may damage regular flow meters: slurries, sludge, wastewater, abrasives, viscous and corrosive chemicals. Because the sensor mounts on the outside of the pipe, there is no pressure drop and no obstruction to flow.
For best performance Doppler sensors should be mounted away from turbulence creating devices like pipe elbows and tees, and away from velocity increasing devices like controlling valves and pumps. Typical accuracy is ±2% of full scale.
Doppler instruments include a strap-on sensor, connecting cable and an electronics enclosure which can be mounted at a convenient location nearby (within 500 ft / 152 m). Sensors can be rated intrinsically safe for mounting in hazardous-rated locations.
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Standard features include:
- strap-on, single head ultrasonic for 1/2" to 180" (12.5 mm to 4.5 m) ID pipes
- sensor cable - 20ft / 6m shielded coaxial pair
- installation - sensor compound kit - PC3 stainless steel sensor mounting clamp
- enclosure - watertight NEMA4X (IP66) polycarbonate
- displays - Flow Rate - large 4-digit LCD - Totalizer/Menu/Status - 16-digit alphanumeric
- calibration - built-in 3-key programmer
- sensitivity - keypad adjustable
- output - Isolated 4-20mA (1000 ohm)
- 3 control relays - 5 amp SPDT - programmable for flow proportional pulse output, and/or flow alarm
- backflow rejection - external, voltage-free relay input
- electrical surge protection and RFI filters: AC line, sensor, 4-20mA
- power input - 100-130VAC 50/60Hz
- 1 Manual - Installation and Operation
DOPPLER FLOW METER SPECIFICATIONS
SCOPE: This specification covers a non-intrusive, ultrasonic Doppler-type flow meter as manufactured by Greyline Instruments Inc., Massena, New York / Long Sault, Ontario. The instrument shall provide for velocity or volumetric indicating and transmitting of the flow rate in a full pipe.
A. PERFORMANCE SPECIFICATIONS
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The flow meter shall operate with a single-head flow sensor mounted externally on any contiguous pipe material that conducts sound including: carbon steel, stainless steel, ductile iron, copper, FRP, PVC, ABS, or cement lined pipe from 1/2" to 180" (12.5 mm to 4.5 m) ID.
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Measure and indicate flow rates between 0.2 to 40 ft/sec (0.06 to 12.2 m/sec) with accuracy of ±2% of full scale on liquids with entrained particles or gases of 100 microns or larger and minimum concentrations of 75 ppm.
B. TRANSDUCER (FLOW SENSOR)
- The flow sensor shall be single-head, ultrasonic in a stainless steel housing. It shall be installed on the outside of a pipe without interrupting flow. The sensor shall be capable of continuous operation at temperatures from -40°F to 200°F (-40°C to 93°C), and to withstand accidental submersion pressures to 10 psi.
- Shall include Manufacturer's recommended sensor coupling compound and adjustable stainless steel sensor mounting clamp.
- Shall include 20 ft (6m) Sensor cable, shielded coaxial pair.
- Shall be capable of extending sensor cable up to 500 ft (152m), without adjustment, and with no reduction in performance or signal strength.
- Shall be transformer isolated and designed to meet intrinsic-safe requirements. Shall be designed for maximum RFI rejection, and include automatic high voltage bleeds for nearby lightning strikes.
C. TRANSMITTER
- The transmitter-indicator shall be housed in a watertight and dust tight NEMA4X (IP 66) polycarbonate enclosure with a gasketed shatter proof window, and suitable for wall mounting. Mounting hardware shall be included.
- Flowmeter electronics shall be designed to operate at temperatures from -5° to 140°F (-20° to 60°C). Electronic circuits are interchangeable with other flowmeters having the same model number. The transmitter circuit and calibration frequency standard shall be crystal controlled. The transmitter shall be powered by 100-130VAC 50/60Hz requiring less than 5 watts.
- The transmitter shall include a built-in 3-Key calibration system with operator selection of parameters through visual prompts from a Menu calibration system. Systems requiring calibration by Parameter codes, BCD switches or external calibrators shall not be accepted.
- The 4-20mA shall be flow proportional and isolated, with programmable zero and full scale offsets. Maximum resistive load shall be 1000 ohms. It shall include automatic high voltage bleeds for nearby lightning strikes.
- Shall include noise suppression circuitry to filter electrical interference.
- Have a continuous 4-digit LCD display indicating flow in user-selected engineering units. Have a 16-digit alphanumeric display indicating totalized flow, units of calibration, and/or signal strength.
- The transmitter shall contain electronic means to prevent cross-talk from other in-service flow meters from the same manufacturer.
- Have 3 control relays rated 5 ampere SPDT. Relays shall be programmable for flow proportional pulse output, or as flow rate alarms with separate ON/OFF set points.
- Have circuitry to force the flowmeter outputs and display to zero during backflow conditions by sensing a voltage-free contact closure from a remote relay device.
D. ADDITIONAL FEATURES FOR INSERTION IN SPECIFICATION AS REQUIRED:
- Sensor, connecting cable and junction boxes shall be rated intrinsically safe to Class I,II,III, Div. I,II, Groups C,D,E,F,G.
- Sensor cable shall be 50 ft (15m) length shielded coaxial pair.
- Have a Cable Junction Box and up to 500 ft (152m) extra Sensor cable that shall be shielded coaxial pair installed in conduit for mechanical protection.
- Have a High Temperature Sensor for operating temperatures from -40° to 302°F (-40° to 150°C)
- Have a thermostatically controlled enclosure heater for condensation protection in locations with temperature below -5°F (-20°C).
- Have power input of 200-260VAC 50/60Hz, or 24VDC, or 12VDC.
- Have a built-in 50,000 point Data Logger with RS232C output. Have serial cable for data transfer to a PC computer, and Windows software for data transfer.
E. MANUFACTURER
The Flow Meter shall be a Model DFM-IV Doppler Flow Meter as manufactured by Greyline Instruments Inc., and warranted against defects in materials and workmanship for one year.
Data Logger
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New!
Store and Retrieve Flow or Level data with this built-in Data Logger
Displays Logs in Graph and Table format with your choice of engineering units
Exports data to Spreadsheet or Database programs
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Data Logger Features
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50,000 date and time-stamped data point capacity
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Multi session capability - stores up to 10 separate logging "sessions"
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Includes "Greyline Logger" software for Windows™
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Isolated RS232 serial output with selectable baud rates from 1200 to 19,200
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Retrieve Data Logs by modem or by direct PC connection
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Log Flow or Level values from 1 second to 30 minute intervals
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Log reports including Minimum, Maximum, Average and Total in your choice of 1-24 hour intervals
Each Greyline Instrument with built-in Data Logger includes an isolated RS232 serial output, terminal connections, cable and adapters. Connect directly to the serial port on your PC or Laptop, or by dial-up connection through modems and phone lines.
Run the Greyline Logger software program to retrieve and display data logs on your computer. Display multiple files or "sessions" in both graph and table formats. Log files can be exported in graphic file formats or as delimited text files for use in spreadsheet or database programs.
Greyline Logger software runs on any PC with Windows 95, 98 or NT.
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