NUS-4
NUS-4 K05/0216
Seite 7
STAND-OFF PIPE
The structure of the stand off pipe should be rigid; the inner rim where the ultrasonic beam leaves the
pipe should be rounded.
L
Ø D
r
L
Dmin
r
Ø D
L
L
Dmin
NUS-
4x04
NUS-
4x06
NUS-
4x08
NUS-
4x10
NUS-
4x15
NUS-
4x25*
150 50 60 60
90 80 130 -
200 50 60 75
200 80 140 -
250 65 65 90
350 85 150 -
300 80 75 105
500 90 160 -
350 95 85 120
L
Ø D
L
Dmin
NUS-4x10
NUS-4x15
90 80
130
200 80
140
350 85
150
500 90
160
*NUS-4x25
mut not be mounted on a pipe socket, since the sensor surface should protrude into the vessel
6.3 Installation (Open Channel Flow Measurement)
For ultimate accuracy, install the sensor as close as possible above the
expected maximum water level (see minimum measuring range).
Install the device in a place defined by the characteristics of the metering
channel along the longitudinal axis of the flume or weir.
In some cases foam may develop on the surface. Make sure that the surface,
opposite to the sensor remains free of foam for proper sound reflection.
From the point of view of measurement accuracy the length of the channel
sections preceding and following the measuring flume and their method of
joining to the measuring channel section are of critical importance.
Despite of the most careful installation, the accuracy of flow metering will be
lower than that of specified for the distance measurement. It will be determined
by the features of the flume or weir applied.
