Dynasonics 902_903 Series Portable Doppler Ultrasonic Flow Meter - Manual (Page 12)

Rev. 10/08
- 10 - D902/3
The transducers that are utilized by the D902/3 contain
piezoelectric crystals for transmitting and receiving
ultrasonic sound energy through the pipe wall.
The transducers can be mounted in three different
configurations. The selection of the proper configuration is
dependent on the characteristics of the liquid to be
measured.
The three liquid characteristics, which will affect mounting
location and orientation, are as follows:
CASE 1: Liquid that contains 25 to 10,000 PPM (1%) of
30 micron or larger suspended solids or aeration.
CASE 2: Liquid that contains greater than 10,000 PPM
(1%) of 30 micron or larger suspended solids or aeration.
CASE 3: Liquid that contains fewer than 25 PPM of 30
micron or larger suspended solids or aeration and
suspended solids and aeration content which is smaller
than 30 microns.
Liquid that contains 25 to 10,000 PPM (1%) of 30
micron or larger suspended solids or aeration.
Select a transducer mounting location with adequate
straight runs of pipe, both upstream and downstream, to
achieve stable readings. Examples of minimum upstream
and downstream requirements are included in Table 1.
Mount the transducers 180° apart and facing each other on
the pipe. If the pipe is horizontal, the preferred mounting
orientation is 3 and 9 o’clock, with 12 o’clock being the top
of the pipe. Orientation on vertical pipes does not matter.
See Figure 4.
PART 2 - TRANSDUCER INSTALLATION
Transducer Mounting
Considerations
CASE 1:
Step A -
Mounting
Locations
Figure 4