Instructions for Use SS 20.500 Ex
– Supplement for use ATEX
Page 5
3 Safety instructions for explosive atmos-
pheres
The ATEX version
SCHMIDT Flow Sensor SS 20.500 Ex
is
only suitable for the following applications:
o
In
explosive dust
atmospheres:
Zone 22
o
In
explosive
gas atmospheres:
Zone 2
The important explosion protection data indicated on the label
of the product must be observed:
o
G = Gas, D = Dust
o
Device categories 1, 2, 3 in the 3 zones
o
Gas specific values: Temperature class (T1
… T6)
o
Dust specific values:
-
Conductive and not conductive
-
Surface temperature with regard to smoldering temper-
ature (less 75
o
C) and ignition temperature (2/3); the
smaller value applies
Prior to carry out operations such as assembly or electrical
connection, make sure that:
o
the operation approval
of the owner is available
o
there is
no explosive atmosphere
o
the device is
disconnected from the mains
o
the device cannot be
switched on inadvertently
Avoid dust deposits (installation position, protection, cleaning
measures…) in order to prevent dangerous increase of the
surface temperature.
Installation, commissioning and periodic checks must be car-
ried out by qualified personnel only ("qualified person“ ac-
cording to TRBS, Technical Rules for Operational Safety,
1203).
Repair work must be carried out by the manufacturer only.
Changes to the device are not allowed and can cause risk of
explosion (ignition).
Only original accessories from the manufacturer may be
used.
