Potentially Explosive Environments - Grundfos SE1 50 Installation And Operating Instructions Manual

2.6 Potentially explosive environments

Use explosion-proof pumps for applications in
potentially explosive environments.
SE1 and SEV pumps must under no cir-
cumstances pump combustible liquids.
The classification of the installation site
must be defined by the owner.
Special conditions for safe use of explo-
sion-proof pumps:
1. Make sure the moisture switch and
thermal switches are connected in the
same circuit, but have separate alarm
outputs (motor stop) in case of high hu-
midity 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 informa-
tion on the dimensions of the flame-
proof joints.
4. The level of the pumped liquid must be
controlled by level switches connected
to the motor control circuit. The mini-
mum level depends on the installation
type and is specified in these installa-
tion and operating instructions.
5. Make sure the permanently attached
cable is suitably mechanically protec-
ted and terminated in a suitable termi-
nal board placed outside the potentially
explosive area.
6. The pumps have an ambient tempera-
ture range of -20 to +40 °C and a maxi-
mum process temperature of +40 °C.
The minimum ambient temperature for
a pump with a water-in-oil (WIO) sen-
sor is 0 °C.
7. The thermal protector in the stator
windings has a rated switch tempera-
ture of 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.
The maximum current from the control
unit must be limited to 350 mA.
9. For painted pumps, minimise the risk
of electrostatic discharge by:
• Earthing (mandatory).
• In dry installations, keep a safety
distance between pumps and walk-
ing paths.
10
• Use wet cloths for cleaning.
10. The WIO sensor must be used only
with a galvanically isolated circuit.
11. The lock nut of the cable connector
must only be replaced with an identical
one.