Only pumps/pump sets marked as explosion-proof and identified as such in the data
sheet may be used in potentially explosive atmospheres.
Special conditions apply to the operation of explosion-proof pump sets to EC
Directive 94/9/EC (ATEX).
Especially adhere to the sections in this manual marked with the Ex symbol and the
following sections (
The explosion-proof status of the pump set is only assured if the pump set is used in
accordance with its intended use.
Never operate the pump (set) outside the limits stated in the data sheet and on the
name plate.
Prevent impermissible modes of operation at all times.
2.10.1 Marking
The marking on the pump refers to the pump 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. (
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 on 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 classes 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 as per EN 13463-1
Maximum permissible fluid
temperature
T1
Temperature limit of the pump
T2
280
℃
T3
185
℃
T4
120
℃
T5
85
℃
T6
Only after consultation
with the manufacturer
In the following cases, and if ambient temperatures are higher, contact the
manufacturer.
Compliance with temperature class T5 is warranted for the area of the rolling
element bearings based on an ambient temperature of 40°C, assuming that the
pump set is properly serviced and operated and that the surfaces in the bearing area
are freely exposed to the atmosphere.
If temperature class T6 has to be complied with, special measures may have to be
taken with regard to the bearing temperatures.
Misuse, malfunctions or non-compliance with the instructions may result in
substantially higher temperatures.
Pump
Shaft coupling
Motor
Temperature class T5
Temperature class T6
2 Safety
Etanorm
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