Wilo Port 800 Einbau- Und Betriebsanleitung Seite 49

INSTALLATION
CAUTION!
To prevent damage to the pumping station, the following points
must be observed:
• The switching points must be set so that no backing up occurs in
the inlet pipe.
• To ensure that correct level measurement is possible, the signal
transmitters may not be located directly in the inlet flow.
• Check the operating mode for which the pump is approved for
non-immersed operation. For S2 or S3 operation, the specified
operating and idle times must be observed when setting the level
control device.
Level measurement can be carried out in different ways:
• Dynamic pressure bell
• Level sensor
• Float switch
The signal transmitters used depend on the switchgear used.
Fig. 11: Attaching the signal transmitters
1 Cross member
2 Mount for dynamic pressure bell and level sensor
Dynamic pressure bell
When using a dynamic pressure bell, level measurement is carried
out by measuring the static pressure in the pump chamber. Note
that the dynamic pressure bell must emerge after each pumping
procedure so that it can be vented. Alternatively, a bubbling-through
system can be used. In this case, a small compressor continuously
pumps air into the dynamic pressure bell.
In addition, we recommend installation of an additional second
dynamic pressure bell for autarkic measurement and signalling of the
high water alarm.
Level sensor
When using a level sensor, level measurement is carried out using
a diaphragm. Make sure that the diaphragm (the lower section of the
level sensor) remain constantly immersed. The level sensor may not
rest on the base of the pump chamber.
Float switch
When using float switches, level measurement is carried out using
floats. Make sure that the float switches have sufficient freedom of
movement and do not bump into the pump chamber.
Installation
The dynamic pressure bell and the level sensor are fitted directly in
the mount on the cross member from above using the accessories
supplied.
The float switch is attached to the vertical discharge pipe using
cable ties. For fault-free level measurement, a free cable length of
approx. 250 mm is required.
To prevent deposits as effectively as possible, the fluid must be
replaced regularly. Therefore, we recommend using the switching
points for the lower inlet. The corresponding switching points are
shown in the following tables.
Installation and operating instructions Wilo-Port 800
3 Dynamic pressure bell
Fig. 11
1
English
2
3
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