Doppler ultrasonic flow meter - DMDFC

Principle of Measurement

The Doppler ultrasonic flow meter is designed to measure volumetric flow of liquid within closed conduit, the pipe line must be filled full of liquids, there must be Ta certain amount ofT air bubbles or suspended solids in liquid.

Transducers are clamp-on or hot-tapped probe types, user don’t need to shut down the pipe flow when install the clamp-on transducers.

The flow meter operates by transmitting an ultrasonic sound from its transmitting transducer, the sound will be reflected by useful sonic reflectors suspended within the liquid and recorded by the receiving transducer. If the sonic reflectors are moving within the sound transmission path, sound waves will be reflected at a frequency shifted (Doppler frequency) from the transmitted frequency. The shift in

There must be some particles large enough to cause longitudinal reflection – particles larger than 100 micronWhen install the transducers, the installation location must have enough straight pipe length upstream and downstream. Commonly, the upstream needs 10D and downstream needs 5D straight pipe length, where D is pipe diameter.

Features of the Doppler ultrasonic flow meter :

1. The system can be field configured to pipe sizes ranging from 65 to 4000mm.

2. Hot-tapped installation and demounted online, do not need to shut down the pipe flow when installing the transducers.

3. For dirty liquids, a certain amount of air bubbles or suspended solids contain

4. Excellent low flow rate measurement ability, low to 0.05 m/s

5. A wide range of flow measurement, high flow rate can reach 12m/s

6. Automatically signal gain adjustment

7. User-friendly configurations

8. 4-20mA, totalizer pulse and relay alarm output

9. Accuracy: 2.0% Calibrated span

Applications of the Doppler ultrasonic flow meters:

1.Raw sewage

2.Return activated sludge

3.Waste activated sludge

4.Ground water

5.Pulp and paper slurries

6.Chemical slurries

7.Drainage

8.Mining recirculation

9.Animal renderings

When installing the insertion transducer, Hot-tapped installation and demounted online, do not need to shut down the pipe flow when install the transducers. while the pipe can’t be welded

directly, such as cement pipe, ductile iron or other unweldable material, please notify manufacturer for extended transducers (wall thickness of pipe can be up to 110mm). In this case, it also need to install a weldable (usually carbon steel) hoop shown as below.

Specification of the Doppler ultrasonic water flow meter:

CE Certificate of the Doppler ultrasonic flow meters