Dynasonics DXN Portable Ultrasonic Measurement System - Manual (Page 24)

Transducer Positioning
1. Place the upstream transducer in position and secure with a
mounting strap. Place straps in the arched groove on the end of
the transducer. A screw is provided to help hold the transducer
onto the strap. Verify that the transducer is true to the pipe and
adjust as necessary. Tighten the transducer strap securely.
2. Place the downstream transducer on the pipe at the calculated
transducer spacing. See Figure 27 . Apply firm hand pressure.
If signal quality is greater than 10, secure the transducer at this
location. If the signal quality is not 10 or greater, using firm hand
pressure slowly move the transducer both towards and away
from the upstream transducer while observing signal quality.
Signal quality can be viewed on the DXN’s display. Clamp the
transducer at the position where the highest signal quality
is observed. The factory default signal quality setting is 10%,
however there are many application specific conditions that may
prevent the signal quality from attaining this level. For the DXN,
signal levels less than 10% will not give readings.
NOTE: N
Signal quality readings update only every few seconds, so it
is advisable to move the transducer 1⁄8", wait, see if signal is
increasing or decreasing and then repeat until the highest level
is achieved.
Figure 27: Transducer Positioning
3. If after adjustment of the transducers the signal quality does not rise to above 10%, then select an alternate
transducer mounting method. If the mounting method was W-Mount, then re-configure the transmitter for V-Mount,
move the downstream transducer to the new spacing distance.
NOTE: N
As a rule, the DTTL transducers should be used on pipes 24" and larger. Do not use DTTL transducers for application
on a pipe smaller than 4". Consider application of the DTTL transducers on pipes smaller than 24" if there are less
quantifiable aspects such as - sludge, tuberculation, scale, rubber liners, plastic liners, thick mortar liners, gas bubbles,
suspended solids, emulsions, and smaller pipes that are perhaps partially buried where a V-Mount is required
or desired.
Transducer
Spacing
Site Name 0.00 GPM 1/16/2013
2:18 PM
Meter Adv Cal System Display Site Log I/O
Create Lookup Liner Doppler Fluid Pipe Transit
Required Spacing (in)
Transducer
Transducer Mount
DTTN 1MHz
Z
12.14 12--1/8”
DXN Portable Ultrasonic Measurement System
Page 24 February 2013