5.5.5 Water-In-Oil sensor
The internal Water-In-Oil (WIO) sensor is
only available for the explosion-proof
pumps in the ranges 58, 62 and 70. The
sensor must be fitted from the factory.
All Ex pumps must be equipped with an in-
ternal or external WIO sensor.
Lack of oil may cause overheating and
damage to the mechanical shaft seals.
The WIO sensor in the oil chamber trips
the alarm if the oil quality or quantity is in-
adequate.
Do not use Shell Ondina X420 oil without
emulsifier detergent in a pump fitted with a
WIO sensor.
The WIO sensor is available as an accessory for all
standard (non-explosion-proof) pumps with 5.5 to 155
kW motors. It can be factory fitted or installed after
the pump is started up.
The oil chamber is filled with oil acting as a lubricant
and a coolant for both mechanical seals. The WIO
sensor measures the water content in the oil
chamber:
• 0-20 % water in the oil does not cause a reaction.
• Water content outside the measuring range
causes a warning.
• Low oil level causes an alarm. The pump must not
operate while this alarm is on.
The sensor consists of a plate capacitor that is
immersed in the oil and measures the electronic
circuit, emitting a 4-20 mA proportional current signal.
5.5.5.1
Fitting an external WIO sensor
To fit the WIO sensor into the oil chamber, proceed as
follows:
1. Remove the oil screw.
2. Push the sensor into the oil filling hole, so it
becomes completely covered in oil, but does not
touch the rotating parts. Recommended insertion
depths for different pump types are indicated in
the table below.
3. Screw the sensor bush into the thread of the oil
screw.
TM035531
Dimensions of a WIO sensor
For WIO sensor insertion, use the follow-
ing holes:
• Vertical installation: Always use the lowest oil
screw hole.
• Horizontal installation: Always use the inspection
screw hole.
After the oil change, clean the WIO sensor
with white spirit before reinsertion.
S pumps, range
Sensor insertion depth
[mm]
50 80
54 90
58 100
62 100
66 100
70 100
More detailed information can be found in the
installation and operation instructions, 96591899, or
in Grundfos Product Center at www.grundfos.com.
28
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