Wilo Rexa CUT GE Series - Page 187

en Appendix
44 WILO SE 2017-12
DANGER
There is a risk of explosion if dry-running protection is connected incor-
rectly!
If the pump is operated within an explosive atmosphere, the dry-running protection
must have a separate signal transmitter (redundant protection of the level control).
Pump deactivation must be performed with a manual reactivation lock!
▪The operator is responsible for defining the potentially explosive area.
▪Only pumps with corresponding Ex rating may be used within a potentially explosive
area.
▪Pumps with Ex rating must be labelled on the rating plate.
▪Do not exceed the maximum fluid temperature!
▪Dry running of the pump must be prevented! Ensure on-site (dry-running protection)
that emerging of the hydraulics is prevented.
According to DINEN50495, a safety device with SIL level 1 and hardware fault toler-
ance 0 must be provided for category 2.
13.2.6 Maintenance and repair
▪Carry out maintenance tasks according to the regulations.
▪Only carry out maintenance tasks mentioned in these installation and operating in-
structions.
▪The spark-proof gaps may only be repaired according to the manufacturer’s design
specifications. It is not permitted to carry out repairs according to the values in tables 1
and 2 of DIN EN 60079-1.
▪Only use screw plugs as stipulated by the manufacturer, that at least correspond to a
strength class of 600N/mm² (38.85long tons-force/inch²).
13.2.6.1 Repair of housing coating
The paint layer can become electrostatically charged in case of thicker
coats.DANGER!Risk of explosion! In explosive atmospheres, a discharge can cause
an explosion!
If the housing coating has to be repaired, the maximum coat thickness is 2mm
(0.08in)!
13.2.6.2 Changing the power supply cable
Changing the power supply cable is strictly prohibited!
13.2.6.3 Changing the mechanical seal
Changing the seal on the fluid and motor side is strictly prohibited!