English (GB)
18
6.4 Potentially explosive environments
Use the explosion-proof S pumps in potentially explosive
environments. See section
.
The explosion classification of the
pump is Ex II 2G, Ex bc IIB T3 or
T4, Ex db IIB T3 or T4 Gb. The
installation must be approved by
the local authorities in each
individual case.
Special conditions for safe use:
1. Make sure the moisture
switches and thermal
switches are connected in two
separate circuits and have
separate alarm outputs (motor
stop) in case of high humidity
or high temperature in the
motor.
2. Bolts used for replacement
must be class A4-80 or A2-80
according to EN/ISO 3506-1.
3. The flame path gaps of the
motor are specified by the
manufacturer and are
narrower than standard.
WARNING:
In case of repairs,
always use original service
parts from the manufacturer
as this ensures correct
dimensions of the flame path
gaps.
4. During operation, the cooling
jacket, when fitted, must be
filled with pumped liquid.
5. The level of pumped liquid
must be controlled by level
switches connected to the
motor control circuit. The
minimum level depends on
the installation type and is
specified in these installation
and operating instructions.
6. Make sure the permanently
attached cables are suitably
mechanically protected and
terminated in a suitable
terminal board.
7. The WIO sensor must always
be fully submerged in the oil
when the power is on.
8. If a WIO sensor is installed,
the control unit must protect
the WIO sensor against short
circuit current from the power
supply to which it is
connected. The maximum
current from the control unit
must be limited to 350 mA.
DANGER
Explosive environment
Death or serious personal injury
- Make sure there is no damage,
cracks or embrittlement of the
cable entries to avoid sparks
that can cause an explosion.
Additional conditions for safe use:
1. Dry-running is not allowed.
2. The sewage pumps have an
ambient temperature range of
-5 to +40 °C (air) or 0-40 °C
(submerged in liquid) and a
maximum operating
temperature of 40 °C.
3. The maximum submersion
depth is 20 m.
4. Dry-installed pumps often
have a higher temperature at
the cable entries than
submerged pumps. This may
reduce the lifetime of the Ex-
protection equipment.
According to EN 60079-14, it
is the responsibility of the
user, on a regular basis, to
inspect the permanently
attached cables and cable
entries for any visual damage,
cracks or embrittlement
caused by rubber aging.
5. The control unit, IO 113, must
protect the sensor against
short-circuit currents from the
power supply to which it is
connected.
6. Install the sensor in such a
way that it is not exposed to
mechanical impact.
7. The WIO sensor must not be
used in oil with spontaneous
ignition temperature below
250 °C.
8. The WIO sensor is only
intended for use with a
galvanically isolated circuit.
