Xylem 704 PUMP CONTROLLER - Manual (Page 9)

9
Table values for the signal
spreading relative to sensor/
surface distance.
Mounting
Pressure Transmitter
When measuring in a well, it
is advantageous to mount
the transmitter in a tube,
fastening it at the top of the
tube by means of the fittings
supplied. This mounting
facilitates subsequent
cleaning and inspection.
Ultrasonic Sensor
When mounting the sensor for example at the top of a
well or a container, ensure that no pipes or cables etc.
are disturbing the path between the sensor and the liquid
surface. The maximum distance between the sensor and
the surface must not exceed the measuring range of the
transmitter. Optimum operation is obtained by placing the
sensor approx. 1 m (3 ft) for 30 kHz sensor, and approx.
0.5 m (1,7 ft) for the 100 kHz sensor, above the
maximum liquid level. The sensor should be positioned
perpendicular to the liquid surface (check with a spirit
level!). When installing the sensor, ensure that the signal
is able to pass any obstruction, taking in consideration
that signal spreads relative to the sensor/surface distance
as described in the table. If the signal travels along a
hard surface such as the side of a well or tank, the table
values can be applied directly. Otherwise you may refer
to the following mounting examples.
If a sensor is mounted above an obstruction ex. a
concrete deck, we recommend that it should be installed
as shown below:
Tube-mounted pressure
transmitter
If the upward edges on the obstruction are angled as
shown below, the sensor can be mounted as the
following:
Sensor mounted in tube
for scum protection.
Sensor mounted near the
top of a closed container.
When measuring
through a hole in
for example a
metal plate or
grate, a pipe that
ends near the
lower edge of the
sensor should be
applied as shown
here:
Min. table
value +100%
Min. 25in (30kHz)
Min. table
value
+25%
30 - 45 o
45 o
Min. table value +100%
Min. table value +50%