03
1.3.2 Explosive atmosphere
Detailed information about the operating conditions at the explosive atmospheres are found in
Directive on Equipment for Potentially Explosive Atmospheres 94/9/EC (ATEX 95).
The pumps to be used at the explosive atmospheres should never be used at areas apart from the
specified areas.
1.3.3 Labelling
Label on the pump is related with the pump only.
Motor:
It is required to be documented and labelled by the engine manufacturer.
1.3.4 Temperature classes and limits
During the pumping applications, the highest temperature occurs in the areas of the electric motor
bearing area, sealing area and volute casing. The volute casing temperature is almost same with
that of the fluid delivered by the pump. If the pump casing is heated externally, the technical
personnel should keep the temperatures under control according to the temperature classes.
Temperature classes given in the
Table 1
and the highest permissible temperature for the pump
during operation are shown in the following table.
II 2 G/D c T4
1
2
3 4 5 6 7
1- CE logo
2- Ex logo
3- Group
4- Category
5- Explosive Atmosphere [Gas(G) and/or Dust(D)]
6- Protection Type (Constructional Safety as per EN 13463-5)
7- Temperature Class
Only the products certificated for the explosive atmospheres should be used
at the explosive atmospheres.
This section should be read carefully for the pumps operating at explosive
atmospheres.
Temperature
Class
T3
T4
Maximum Surface
Temperature
200 °C
135 °C
Maximum Permissible
Fluid Temperature
180 °C
110 °C
Temperature Limits
Table 1
Example
II 2 G/D c T4
II 2 G/D :
Group II, Category 2 Gas (G) and/or Dust (D) ambient.
c :
Constructional Safety (c)
T4 :
Temperature Class (T4)
