General instructions
Safety instructions
Beck GmbH
Druckkontrolltechnik
Ferdinand-Steinbeis-Straße 4
71144 Steinenbronn
Operating instructions – Pressure Switch – Model - 901...EX
Rev.10
Page 4 of 18
1.1.2 Safety instructions for potentially explosive areas
The 901..EX pressure switch is suitable for use in areas where there
is a risk of gas or dust explosion
Please follow the applicable
Instructions and system-specific regulations
The labelling of the product must point out that important explosion protection characteris-
tics must be adhered to during use.
G = Gas; D = Dust
Device category 1, 2, 3 or Equipment Protection Level EPL in the 3 zonal areas
Gas parameters: temperature class (T1…T6), explosion group (A, B, C)
Dust parameters: Explosion group (IIIA, B: non-conductive; IIIC: conductive);
Surface temperature, glow and ignition temperature
When work is being performed such as installation, making electrical connections, making
repairs or opening the housing, it must be ensured that
no potentially explosive atmosphere is present
no electrical voltage is present
unintentional activation is ruled out
Dust deposits must be avoided (installation location, protection, cleaning etc.) in order to
prevent dangerous surface temperature increases
For the installation procedure it is necessary to take care that no electrostatic charging will
be done (no high volume flow, cleaning only with damp cloth,…)
It must be ensured that all technical and organisational protective measures are complied
with and that the operation and effectiveness thereof is checked
No modifications must be made to the equipment, since they may lead to a risk of explo-
sion (ignition)
The specifications of the EC design certificate are binding and must be complied with
If the number of the EC design certificate is followed by an “X”, special conditions or devia-
tions from the standard conditions exist
Installation, start-ups and repeated testing may only be carried out by appropriately quali-
fied personnel
The operator must issue a release for work before any activity (installation etc.) is carried
out in potentially explosive areas.
1.1.3 Notes on environmental protection
Please help to protect the environment. Please pay attention to the environmental notes in these
operating instructions:
Chapter 3.1 “Storage“: Handling of packaging materials
Chapter 8.1 “Disposal“: with regard to the product and its components