Grundfos DPK Montage- Und Betriebsanleitung Seite 18

8.4.4 Inspecting the seal sensor
Check the resistance of the seal sensor with a
multimeter as shown in fig. 13.
Do not use a megger as it will damage the
control circuit of the seal sensor.
TP TP
SS SS
Fig. 13 Resistance check
8.4.5 Oil check and oil change
Oil plug
Fig. 14 Position of oil plug
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1. Loosen the oil plug. See fig. 14.
20 KΩ
2. Remove the oil plug and check the oil level.
3. Take a sample to inspect the condition of the oil.
4. If the oil needs to be changed, place a clean
5. Tilt the pump with the oil-filling hole pointing
6. Fill fresh oil into the oil chamber through the oil
8.4.6 Inspection and adjustment of impeller
Check the clearance between the impeller and the
wear plate. Recommended clearance is 0.3 - 0.5
mm. Replace or repair as necessary.
CAUTION
Pressurised system
Minor or moderate personal injury
- When loosening the oil plug of the oil
chamber, note that pressure may have
built up in the chamber. Do not remove
the oil plug until the pressure has been
fully relieved.
container under the pump to collect all the
drained-off oil.
downwards in order to drain the pump of oil.
If the drained oil is contaminated or opaque, this
is an indication of an impending mechanical shaft
seal failure. Replace the mechanical seal.
Used oil must be disposed of in
accordance with local regulations.
filling hole. Use lubrication oil ISO VG 32 Mobil
DTE 24 turbine oil 90 or equivalent.
clearance