Dynasonics 901 Series Enhanced Ultrasonic Flow Meter - Manual (Page 6)

Rev. 04/02
-5- D901/M
PART 1 - INTRODUCTION
The D901/M ultrasonic flow meter is designed to measure
the fluid velocity of liquid within closed conduit. The
transducers are a non-contacting, clamp-on type, which
will provide benefits of non-fouling operation and ease of
installation.
The flow meter operates by transmitting an ultrasonic
sound from its transmitting transducer through the pipe
wall into the flowing liquid. The sound will be reflected by
suspended particles or bubbles within the liquid and
recorded by the receiving transducer. A frequency shift
(Doppler effect) will occur that is directly related to the
speed of the moving particle or bubble. This shift in
frequency is interpreted by the instrument and converted
to various user defined measuring units.
A unique feature of this product is that it employs a
proprietary digital filtering system and recognition circuit.
This feature allows the instrument to measure fluid
velocities of clean liquids if the transducers are mounted
downstream from a 90
° elbow. The non-symmetrical
hydraulic turbulence which occurs downstream of an
elbow is captured, linearized and can be displayed as
liquid velocity and volume. This capability is not available
in conventional Doppler technology.
The D901/M flow meter can be successfully applied on a
wide range of metering applications. The simple to
program transmitter allows the standard product to be
used on pipe sizes ranging from 1 - 120 inch [ 25 - 3050
mm ] pipe I.D. (With the small pipe transducer option, the
pipe size range is 0.25 - 1 inch [ 6 - 25 mm]). A variety of
liquid applications can be accommodated: raw sewage,
reclaimed water, river water, plant effluent, mining slurries,
sludge, etc. Because the transducers are non-contacting
and have no moving parts, the flow meter is not affected
by system pressure, fouling or wear. Standard
transducers are rated to 250
°F [121°C]. Optional high
temperature transducers are rated to operate to 400
°F
[204
°C].
General
Application Versatility