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3. Installing the product
Installation must be carried out by
Grundfos or an authorised service
workshop.
The free end of the permanently connected supply
cable must be connected by using a suitable certified
junction box or it must be connected outside the
explosive area.
CAUTION
Electric shock
Minor or moderate personal injury
‐
Switch off the power supply before you
start any work on the product.
‐
Make sure that the power supply
cannot be accidentally switched on.
When the sensor is re-fitted after oil change, it must
be cleansed by means of a solvent.
3.1 Explosion-proof environments
The control unit must protect the sensor:
1. The WIO sensor is approved according
to EN/IEC 60079-18. In Ex and IECEx
applications, the WIO sensor shall be
protected by an external current
limitation of 350 mA with a breaking
capacity of the maximum prospective
short circuit current of the supply. This
limited current must be provided by a
galvanic isolated power supply to the
sensor.
Note: As the IO 113 is equipped with
this current limitation and galvanic
isolated power supply, no further
protection is required when using an IO
113.
2. The sensor must always be installed in
such a way that it is protected against
mechanical damage and the possibility
for electrostatic charge.
3. The sensor must be installed
submerged in an oil chamber or similar
- not for use in air environment.
4. The sensor is protected using
protecting method "m" (EN/IEC
60079-18), "e" (EN/IEC 60079-7) and
"t" (EN/IEC 60079-31).
6
3.2 Mechanical installation
The mechanical installation depends on the pump
type and whether the wiring of the sensor in the pump
must be internal or external. See sections
wiring, inside pump
and
External wiring, outside
pump.
However, the sensor must always be installed in such
a way that it is protected against mechanical damage
and the possibility for electrostatic charge. This will
typical be in the oil chamber or similar.
Related information
3.2.1 Internal wiring, inside pump
3.2.2 External wiring, outside pump
3.2.1 Internal wiring, inside pump
When sensors with internal wiring are to be replaced,
proceed according to the service instructions of the
pump in question.
It is important to ensure proper earth
connection between the metal housing of
the WIO sensor and the pump housing.
This is normally done through the holder
for the WIO sensor.
3.2.2 External wiring, outside pump
1. Fit the cable with a bush and an adapter for NPT
thread, typically 3/4".
2. Push the sensor into the oil chamber through the
filling hole and screw the bush into the thread. Do
not tighten the bush until the sensor is positioned
correctly in the pump.
3. Insert the sensor so far into the chamber that it is
completely submerged in the oil.
The product must not touch rotating
parts.
Ensure proper earth connection
between the screen of the cable and
the control cabinet.
Internal
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