46
–
the specific marking of explosion protection, followed by the symbol referring to the category
(see equipment categories for hazardous areas),
–
for equipment group I (see equipment groups for hazardous areas) the letter “M“,
–
for equipment group II (see equipment groups for hazardous areas) the letter “G“ for areas
containing explosive atmospheres caused by gases, vapours or mists, and/or the letter „D“ for
areas, in which dust can form a potentially explosive atmosphere,
–
all other information essential to their safe use.
Example:
E.L.B. – Ex-Geräte Bachmann GmbH + Co
D-64625 Bensheim
Type EEx-p Controller F-351._._
Ex
I/II 2G
EEx p me [ia] IIC T4
TÜV 02 ATEX 1801
9.9 GRP (Glass-Fibre Reinforced Plastic)
Glass-fibre reinforced plastic is used in manufacturing the enclosure of the control unit. It has a
surface conductivity of less than 10
9
Ω
.
9.10 Ingress Protection (IP) Code
The IP Code (DIN EN 60529: 1992) describes the protection an enclosure affords against external
influences. The code consists of the letters IP and two digits. The first digit indicates the protection
against solid substances, the second the protection against liquids.
First digit
Protection against
Second digit
Protection against
0
No protection
0
No protection
1
Objects > 50 mm
1
Water drops falling vertically
2
Objects > 12 mm
2
Water drops falling at an angle
(75 – 90°)
3
Objects > 2,5 mm
3
Water-spray at an angle up to 60°
4
Objects > 1,0 mm
4
Water-spray from all directions
5
Protected against
dust
5
Water jets
6
Dust-tight
6
Strong water jets (heavy seas)
7
Effect of immersion
8
Prolonged immersion