Prevent impermissible modes of operation at all times.
For information on application options of individual components (if any) in
potentially explosive atmospheres, refer to the manufacturer's product literature.
2.10.1 Marking
The marking on the pump refers to the pump part only.
Example of such marking: II 2 G c TX
Refer to the Temperature Limits table for the temperatures permitted for the
individual pump variants. (⇨ Section 2.10.2 Page 11)
An EC manufacturer's declaration is required for the shaft coupling; the shaft
coupling must be marked accordingly.
The motor must be considered separately.
2.10.2 Temperature limits
In normal pump operation, the highest temperatures are to be expected at the
surface of the pump casing, at the shaft seal and in the bearing areas.
The surface temperature at the pump casing corresponds to the temperature of the
fluid handled. If the pump is heated, the operator of the system is responsible for
observing the specified temperature class and fluid temperature (operating
temperature).
The table below lists the temperature classes and the resulting theoretical
temperature limits of the fluid handled (a possible temperature rise in the shaft seal
area has already been taken into account).
The temperature class specifies the maximum permissible temperature at the surface
of the pump set during operation. For the permissible operating temperature of the
pump in question refer to the data sheet.
Table 4: Temperature limits
Temperature class to EN 13463-1
Maximum permissible fluid
temperature
T1 Maximum 140 °C
T2 Maximum 140 °C
T3 Maximum 140 °C
T4 80 °C
T5 45 °C
T6 Impermissible
Based on an ambient temperature of 40 °C and proper maintenance and operation,
compliance with temperature class T5 is warranted in the area of the rolling element
bearings. If the ambient temperature exceeds 40 °C, contact the manufacturer.
2.10.3 Repair
Special regulations apply to repair work on explosion-proof pumps. Modifications or
alterations of the pump set can affect explosion protection and are only permitted
after consultation with the manufacturer.
Repair work at the flameproof joints must only be performed in accordance with the
manufacturer's instructions. Repair to the values in tables 1 and 2 of EN 60079-1 is
not permitted.
Pump
Shaft coupling
Motor
Temperature class T5
2 Safety
Omega / Omega V
11 of 94
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