en
Appendix
38
WILO SE 2017-12
▪ In the event of a fault on the internal sealing chamber control, use the external double-
rod electrode.
The following construction measures can also help to reduce or prevent faults:
▪ Separate power supply cables for the main and control cable (depending on the motor
size).
▪ When laying, ensure there is adequate clearance between the main and control cable.
▪ Using shielded power supply cables.
Summary
▪ Continuous duty up to rated frequency (50 Hz or 60 Hz), observing the minimum flow
velocity.
▪ Observe additional measures with regard to EMC regulations (choice of frequency con-
verter, using filters, etc.).
▪ Never exceed the rated current or rated speed of the motor.
▪ It must be possible to connect the motor’s own temperature monitoring (bimetallic
strip or PTC sensor).
13.3
Ex rating
This section contains further information on the operation of the pump in an explosive
atmosphere. All personnel must read this section.
This section applies only to Ex-rated
pumps!
13.3.1
Identification of Ex-rated pumps
For use in explosive atmospheres, the pump must be marked as follows on the rating
plate:
▪ “Ex” symbol of the corresponding approval
▪ Ex classification
▪ Certification number (depending on the approval)
The certification number, if required by the approval, is printed on the rating plate.
13.3.2
Protection class “Flameproof en-
closure” and “Explosion proof”
The motor must be equipped with at least one temperature limiter (1-circuit temperat-
ure monitoring). A temperature control (2 circuit temperature monitoring) is also pos-
sible.
13.3.3
Intended use
DANGER
Explosion due to pumping of explosive fluids!
Pumping of highly flammable and explosive fluids (gasoline, kerosene, etc.) in pure
form is strictly prohibited. There is a risk of fatal injury due to explosion! The pumps
are not designed for these fluids.
ATEX approval
The pumps are suitable for operation in potentially explosive areas, which require
devices belonging to group II, category 2. The pumps can be used in both zone 1 and
zone 2.
These pumps must not be used in zone 0!
FM approval
The pumps are suitable for operation in potentially explosive areas, which require
devices belonging to the protection class “Explosion proof, Class 1, Division 1”. There-
fore, operation in areas with the required protection class “Explosion proof, Class 1, Di-
vision 2” is also possible.
13.3.4
Electrical connection
DANGER
Risk of death due to electrocution!
Improper conduct when carrying out electrical work can lead to death due to electric
shock! Electrical work must be carried out by a qualified electrician in accordance
with the locally applicable regulations.
▪ Always connect the pump to an electrical outlet outside the explosive area. If the con-
nection must be made within the explosive area, then the connection must be carried
