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DMDF1B
CLAMP-ON DOPPLER ULTRASONIC FLOWMETER |
DMDF1 Enhanced Ultrasonic Doppler Flowmeters measure solids-bearing or aerated liquids in metal or plastic pipe. Proprietary circuitry allows this instrument to operate with lower concentrations of suspended solids than any competitive Doppler flowmeter expanding the instrument's range of applications and reliability. Clamp-on, or Insertion transducers permit the instrument to be installed in minutes without interrupting system pressure or flow. In addition, no pressure head-loss is created; therefore system pump horsepower requirements are reduced. The DMDF1 transmitter has a full keypad designed for simple field setup and application versatility. The two-line, backlit, alphanumeric display shows instantaneous flow rate and totalized flows in a variety of user selectable engineering units. |
Ultrasonic Doppler flowmeters operate by transmitting and receiving ultrasonic sound signals in liquids. An instrument, such as the DMDF1, incorporates dual transducers that are clamped on opposite sides of a liquid filled pipe. Each transducer contains a piezoelectric crystal . Referring to the above illustration, the ? transducer transmits an ultrasonic signal through the pipe wall into the liquid. A portion of this signal is reflected by suspended solids, entrained gases or flow turbulence moving with the fluid, back toward the second transducer, ?, Electronic circuitry compares the transmitted frequency with the received frequency. The difference, or frequency shift, is proportional to fluid velocity, in accordance with principles developed by Christian Johann Doppler. If the liquid is not moving (a zero flow condition) the transmitted and received frequencies are identical. The Series 901 features advanced signal processing and an exclusive auto-adapting digital filter to produce accurate and stable indications of flow rate and totalized flows. A full function keypad allows field configuration of pipe size, engineering units, the 4-20mA output and all operating parameters. |
- The system can be field configured to pipe sizes ranging from 1 to 120inches [25 to 3050 mm].
- Non-fouling transducer is immune to build-up of grease, paraffin and
other coating materials.
- Solid-state measurement never requires re-calibration and is virtually maintenance-free.
- Operates with relatively clean liquids as well as liquids with
concentrations of suspended solids or aeration.
- Does not require long straight runs of pipe.
- Rugged NEMA 4X design permits extended outdoor and rough service use.
- Industry standard outputs allow direct interface to loggers and controls systems. |
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Transmitter
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Description |
Specifications |
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Principle of Measurement |
Principle of Transit Time, DSP technology and MultiPulse Transducer Technology |
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Power Requirements |
90-240Vac 50/60Hz ¡À15% @ 5 VA max or 9-28Vdc @ 2.5 VA max, for the user to choose on wiring terminals |
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Velocity |
0 ~ ¡À12 m/s |
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Outputs
Optional
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All outputs are isolated form earth and system grounds.
4-20mA£º1000 ohm max, veracity :0.1%
Pulse output£º 1~9999HZ (From OCT), Flow rate or totalizer output
RS232 or 485, options: Hart protocol+(4-20mA), MODBUS protocol, SD card data logger( up to 8 GB based SD card capacity) |
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Display |
4 line¡Á16 English letters LCD back lit, can display total flow, flow rate, velocity and meter run status etc. |
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Units
Rate
Totalizer |
User Configured (English and Metric)
Flow Rate and Velocity Display
Forward total; Reverse total; Net Total(difference between forward and reverse flow) |
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Ambient Conditions |
-40 to 131F [-40 to 55¡æ], 0-95% relative humidity, non-condensing |
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Enclosure |
NEMA 4X [IP65] Polycarbonate SS Brass and plated steel
241H¡Á193W¡Á77D mm |
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Accuracy Flow Rate |
¡À1.0% of reading at rates >0.5 m/s); ¡À0.005 m/s of reading at rates<0.5 m/s |
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Repeatability |
¡À0.2% of reading |
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Responding Time |
500ms display refresh, sampling cycle 7.5ms |
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Security |
Keypad lockout, access code enable |
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Approvals(option) |
Exd¢òBT6 Explosion-proof certified |
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Other functions |
Automatic record incident and functions of management of flow
Remember the state of the flow meter
Diagnosis |
Transducer
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Description |
Specifications |
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Liquid types |
Virtually most any liquid containing less than 2% total suspended solids (TSS) or aeration. |
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Suited Liquid temperature |
Standard Temp. Transducer: -40 to 240F [-40 to 121¡æ]
High Temp. Transducer : -40 to 480F [-40 to 250¡æ] |
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Transducer to Transmitter Cable distance |
Shield cable, standard 6 meters, (opt) Lengths to 300 meters |
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Pipe size |
Std M type transducer: 40 to 1000 mm] pipe I.D, Options: L transducer: 40-180inches(1000- 4570 mm) , S transducer: 12-50mm |
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Pipe material |
All kind of steel and cast iron, PVC etc.¡¡ | |
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Data Logger Quick Install.pdf
Data Logger System.rar