Grundfos SE1 50 Notice D'installation Et De Fonctionnement page 12

4.1 Potentially explosive environments
Use explosion-proof pumps for applications in
potentially explosive environments.
The pumps must under no
circumstances be used to pump
FM
explosive, flammable, or combustible
liquids.
The classification of the installation site
FM
must be approved by the local fire-
fighting authorities.
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Specific conditions for use:
1. Make sure the moisture- and
thermal switches are connected in
the same circuit but 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 A2-70 or better according to
EN/ISO 3506-1.
3. Contact the manufacturer for
information on the dimensions of
the flameproof joints.
4. The level of the pumped liquid must
be controlled by two 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.
5. Make sure the permanently
attached cable is suitably
mechanically protected and
terminated in a suitable terminal
board placed outside the potentially
explosive area.
6. The sewage pumps have an
ambient temperature range of 32°F
FM
to +104 °F (0 °C to +40 °C) and a
maximum process temperature of
104 °F (40 °C).
7. The thermal protection in the stator
windings has a nominal switch
temperature of 302 °F (150 °C) and
must guarantee the disconnection
of the power supply. The power
supply must be reset manually.
8. The control unit must protect the
WIO sensor against short circuit
current of the supply to which it is
connected. The maximum current
from the control unit must be
limited to 350 mA.
9. In case of frequency converter use,
the maximum surface temperature
of the pump can be 392 °F (200
°C).
10. The WIO sensor is intended for use
only with a galvanically isolated
circuit.
11. The lock nut of the cable connector
must only be replaced with an
identical one.
12. The WIO sensor must be
connected according to these
installation instructions.
EX pumps are equipped with a WIO
FM
sensor.
Related information
2.5.2 Explanation to FM approval