Ultrasonic Flow Meter (Doppler) - DFX / DT9

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The DFX ultrasonic Doppler flow meter measures flows of liquids containing suspended particles or aerated liquids. The suspended particles must reflect ultrasonic energy. The DFX flow meter operates by transmitting ultrasonic waves into the flow stream and measuring the frequency shift of the reflected wave. The meter’s clamp-on design allows quick and low-cost installation, and eliminates worries of fluid compatibility and pressure head loss. A hot-tappable insertion probe transducer is available for installation on pipe systems that do not permit ultrasound penetration. With no moving parts, there is no mechanical wear, so repair kits or replacement parts are not needed.

Ultrasonic Flow Meter (Doppler) - DFX / DT9

  • Measurement type: ultrasonic Doppler flow measurement
  • Liquid types: semi-clean liquids with suspended sonic reflectors
  • Accuracy: +/- 2% full-scale over calibrated span
  • Interface: 2-line x 8-character LCD
  • Pipe/tubing sizes: 1/4 inch (6 mm) and above, full pipe
  • Power supply: 115/100/230 VAC
  • Optional outputs: 4-20 mA, dual relay and rate pulse
  • Automatic gain control and in-field linearization
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Dynasonics Badger Meter Warranty & Support

PRODUCTS
This warranty shall apply to Badger Meter Equipment and Parts (“Product(s)”) sold on or after August 1, 2014. This warranty is extended only to commercial users and authorized Badger Meter, Inc. distributors, hereafter referred to as “Customer,” and does NOT apply to consumers.

MATERIALS AND WORKMANSHIP
Badger Meter warrants Product to be free from defects in materials and workmanship appearing within the earlier of either: one (1) year after installation; or one (1) year and six (6) months after shipment from Badger Meter.

PRODUCT RETURNS
Product failures must be proven and verified to the satisfaction of Badger Meter. The obligation of Badger Meter hereunder shall be limited to such repair and replacement and shall be conditioned upon Badger Meter receiving written notice of any alleged defect within ten (10) days after its discovery. This exclusive remedy shall not be deemed to have failed its essential purpose so long as Badger Meter is willing and able to replace defective Product to Customer within a reasonable time after receipt of proof that a defect is involved. Product returns must be shipped by the Customer prepaid F.O.B. to the nearest Badger Meter factory or distribution center. The Customer shall be responsible for all direct and indirect costs associated with removing original Product and reinstalling the repaired or replacement Product.

LIMITS OF LIABILITY
This warranty shall not apply to Product repaired or altered by any party other than Badger Meter. The foregoing warranty applies only to the extent that the Product is installed, serviced and operated strictly in accordance with instructions from Badger Meter. The warranty shall not apply and shall be void with respect to Product exposed to conditions other than those detailed in Product technical literature, or which have been subject to vandalism, negligence, accident, acts of God, improper installation, operation or repair, alteration, or other circumstances which are beyond the reasonable control of Badger Meter. With respect to equipment and parts not manufactured by Badger Meter, the warranty obligations of Badger Meter shall in all respects conform and be limited to the warranty extended to Badger Meter by the supplier.

THE FOREGOING WARRANTIES ARE EXCLUSIVE AND IN LIEU OF ALL OTHER EXPRESS AND IMPLIED WARRANTIES WHATSOEVER, INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANT ABILITY AND FITNESS FOR A PARTICULAR PURPOSE (except warranties of title).

Any description of the Product, whether in writing or made orally by Badger Meter or agents of Badger Meter, specifications, samples, models, bulletins, drawings, diagrams, engineering sheets or similar materials used in connection with any order from the Customer are for the sole purpose of identifying the Product and shall not be construed as an express warranty. Any suggestions by Badger Meter or agents of Badger Meter regarding use, application or suitability of the Product shall not be construed as an express warranty unless confirmed to be such in writing by Badger Meter.

Exclusion of Consequential Damages and Disclaimer of Other Liability

The liability of Badger Meter with respect to breaches of the foregoing warranty shall be limited as stated herein. The liability of Badger Meter shall in no event exceed the contract price.

BADGER METER SHALL NOT BE SUBJECT TO AND DISCLAIMS:
(1) ANY OTHER OBLIGATIONS OR LIABILITIES ARISING OUT OF BREACH OF CONTRACT OR OF WARRANTY, (2) ANY OBLIGATIONS WHATSOEVER ARISING FROM TORT CLAIMS (INCLUDING NEGLIGENCE AND STRICT LIABILITY) OR ARISING UNDER OTHER THEORIES OF LAW WITH RESPECT TO PRODUCTS SOLD OR SERVICES RENDERED BY BADGER METER, OR ANY UNDERTAKINGS, ACTS OR OMISSIONS RELATING THERETO, AND (3) ALL CONSEQUENTIAL,INCIDENTAL, AND CONTINGENT DAMAGES WHATSOEVER.

1 Year Flow Instrumentation Product Warranty (INC-WR-00547-EN)

Technical Support

Chat with us or call (502) 266-6640.

Technical Support

or call (502) 266-6640.

Operating Principle

Each Doppler flow meter utilizes two piezoelectric crystals contained within either two separate transducer heads (Figure 1), one transducer head (Figure 2) or the probe tip of the insertion model. Sound is transmitted from one of the crystals, reflected by useful sonic reflectors suspended within the liquid and recorded by the receiving transducer. If the reflectors are moving within the sound transmission path, sound waves will be reflected at a frequency shifted (Doppler shift) from the transmitted frequency. The difference between the reflected frequencies and transmitted frequencies is directly proportional to the speed of the sonic reflectors, resulting in a liquid flow rate that is converted to various user defined measuring units.

Successful application of Doppler ultrasonic flow meters relies on three physical constraints.

  1. The liquid flowing within the pipe must contain 100 ppm of useful sonic suspended reflectors - dissolved solids do not generate reflections and are not relevant.
    • The speed of sound of the reflector must vary by greater than 10% from that of the liquid carrier.
    • Particles must be large enough to cause longitudinal reflection. Particles greater than 35 micron size meet this criteria.
    • In typical applications, there is often a distribution of particle sizes. If the volume of particles greater than 100 microns is 25% of the overall particle volume, then the reflectors are adequate for a Doppler ultrasonic flow meter.
    • The reflecting material must travel at the same velocity as the fluid for good accuracy. Upward flowing pipes running at low velocities may not carry heavier reflectors at the same velocity as the carrying liquid - leading to inaccurate flow measurements.
  2. A significant portion of the ultrasound energy generated by the transducer must reach the sonic reflectors. In the case of a clamp-on transducer, the ultrasonic transducer must be acoustically coupled to the outside of a pipe (using grease or RTV couplant) and the pipe must permit ultrasound to pass without significant attenuation. Most pipes constructed of solid, homogenous materials meet this qualification. Pipes that cause application difficulty include concrete pressure pipes, wooden stave pipes, Teflon-lined pipes and fiberglass reinforced pipes. Pipes that do not readily pass ultrasound are candidates for the DP7 insertion probe transducer.
  3. The pipe must be completely filled with liquid when measurements are made. The DFX microprocessor assumes that the pipe is completely full when it calculates flow rate. Use on partially-filled pipes may result in inaccurate readings.