Dynasonics 901 Series Enhanced Ultrasonic Flow Meter - Manual (Page 13)

Rev.
04/02 -12- D901/M
The mounting location and straight pipe requirements for
CASE 2 liquid characteristics are the same as those
describe in CASE 1. The difference will be in the location
of the transducers on the pipe. As the discontinuities
(suspended solids or aeration) reach a level of
approximately 1% or 10,000 PPM, sound can no longer be
reliably transmitted through the liquid as it has a tendency
to scatter and absorb into the high concentration of
discontinuity. To compensate for this, the D901/M
transducers can be located on the same region of the
pipe. In a horizontal pipe, mount the transducers at 2
o’clock and 4 o’clock positions. (Assuming 12 o’clock as
the top of the pipe.) See Figure 5.
Liquid that contains fewer than 25 PPM of 30 micron
or larger suspended solids or aeration. Or, liquid that
contains solids or aeration which is smaller than 30
microns.
The transducers will be mounted 1 to 3 pipe diameters
downstream from a 90° elbow. The orientation of the
transducers on the pipe will be 180° apart and facing each
other and 90° out of the plane of the elbow. See Figure 6.
PART 2 - TRANSDUCER INSTALLATION
CASE 3:
Figure 5