Dynasonics D601 Series Doppler Ultrasonic Flow Meter - Manual (Page 5)

Rev. 4/00 -1.4- D601
The Dynasonics D601 flowmeter is designed to
measure the flow of liquids and slurries in full-pipe
closed systems. The transmitter is field configured to
measure flow on a variety of pipes and liquids. The
standard product is typically used on pipe sizes
ranging from 1 - 120 inch [ 25 - 1524 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: sewage,
sludges, concrete, mining slurries, dredging, 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].
The basic principle of operation is the measurement
of the frequency shift “Doppler” of a reflected
ultrasonic signal from discontinuity in the flowing
liquid. In theory, these discontinuities can be virtually
any amount of suspended bubbles, solids, or
interfaces caused by turbulent flow. In practice the
degree to which this can be reliably accomplished is a
function of the sensitivity and frequency of the
transducer and associated transmitter. The D601
design requires greater than 100 PPM of suspended
solids or bubbles over 100 microns in size. Should
your application be cleaner than this, please check
with the factory for information on transit time
ultrasonic flowmeters. The transducer which
generates and receives the ultrasonic signal supplies
the data to the transmitter. The transmitter processes
the signal and provides an analog and pulse output
for velocity indicating and volumetric totalizing. In
addition, the transmitter contains a signal strength
indicator which determines satisfactory operation.
PART 1 - GENERAL
General
Operating Theory