Cleaning The Sensors - Grundfos SLV.65 AUTOADAPT Installation And Operating Instructions Manual

8.5 Cleaning the sensors

The cleaning intervals below are stated as guidelines
and must be adapted to the pit.
Cleaning intervals for non-explosion-proof
pumps
The following table lists the recommended cleaning
intervals for sensors in non-explosion-proof pumps.
These cleaning intervals are for guidance. We
recommend that you find the right cleaning level
based on experience and the composition of the
wastewater in the specific application.
Wastewater
Wastewater
containing dry
containing
solid matter or
grease
fibres
3 months 6 months
Cleaning intervals for sensors in explosion-proof
pumps
Cleaning intervals of the sensors in
explosion-proof pumps are mandatory in
order to ensure that the pump is working
correctly.
After cleaning, both dry-running sensors
must be checked individually for proper
functioning.
If the dry-running sensors are not
functioning properly, there is a risk of dry-
running of the hydraulic part of the pump,
which can provoke ignition.
The following table lists the required cleaning
intervals for sensors in explosion-proof pumps.
Wastewater
Wastewater
containing dry
containing
solid matter or
grease
fibres
3 months 6 months
20
Wastewater
without grease,
dry solid matter
or fibres
12 months
Proceed as follows:
See fig. 14.
1. Level sensor (7):
2. Switch on the power supply to the pump.
3. Check that the pump starts and pumps down to
Wastewater
without grease,
dry solid matter
Checking the functionality of the dry-running
or fibres
sensors
6 months
1. Cover one dry-running sensor with a wet cloth.
2. Let the pump run and pump down to the dry-
3. Repeat this check with the other sensor.
Fig. 14 Position of level and dry-running
sensors
Flush the sensor with clean water.
Dry-running sensors (10):
Flush the dry-running sensors with clean water
and clean them using a soft brush.
the dry-running level.
To avoid damaging the sensors, do not use
other cleaning aids than those mentioned
in this booklet.
If the dry-running sensors are not covered
by liquid, the pump cannot start.
running level.
– The pump must stop at the dry-running level.