Picture 46 Signal Images - Systec deltawaveC-P User Manual

deltawaveC-P
User manual
mounting mode. E.g. when mounted in V-mode the V-mode signal is the
desired signal. The other signals (Z-mode, W-mode, pipe wall) are also
there and might disturb (seldomly) this signal (see below). The
corresponding transducer is mounted in V-mode as standard but also Z-
mode and W-modes are possible. This transducers receives the signals
and return another signal to UP transducer.
The time the signals needs from one transducer to the corresponding
transducer (run time) depends on path length (distance), speed of sound of
materials and fluid and of course on flow velocity.
Depending on mounting mode the signals might look as shown in
tp tp
Picture 45 Signal images
At t=0 the UP-transducer starts signal transmission. After time T=tp you
can see the pipe wall signal which reaches the corresponding transducer
first because of shorter distance and (usually) faster propagation cause by
higher speed of sound of pipe material.
After that, at time T=t1v, the V-mode signal reaches the transducer (single
reflection at opposite pipe wall). After t1w (ca. 2x t1p) the W-mode signal is
being detected. Usually, when having pipe materials highly conductible for
ultrasonic signals (metals) and small pipes, the pipe wall signal has high
amplitude which is similar to amplitude of V-mode signal. When having
sound-absorbing materials (plastic, concret) and/or coating the pipe wall
systec Controls Mess- und Regeltechnik GmbH
www.systec-controls.de
t1v t1v
Picture 45
t1w t1w
113/139
time time