Siemens MicroSAM, Operating Instructions Manual, Page: 16 / 138

General information
2.4 Protection against explosion
MicroSAM
14
Operating Instructions, 06/2012, C79000-G5376-C560-07
Table 2- 1 Case examples for explosion protection
Case
no. Concen-
tration of
oxygen
in normal
operation Transient
concen-
tration of
oxygen
(not normal
operation) Permis
sible
carrier
gases Sample
pressure
(absolute) External
flame
arrester
Substances
that are
explosive
under
exclusion of
oxygen Process
medium
zone x MicroSAM
(7KQ3101) SITRANS
CV
(7KQ3105)
1 0 ... 2 % 0 ... 2 % H
2
, He,
N
2
, Ar
1.0 ... 1.6 bar Not
required
Not allowed Not
explosive
x x
2 0 ... 2 % 0 ... 21 % H
2
, He,
N
2
, Ar
1.0 ... 1.6 bar Not
necessary
Zone 1 x
3 0 ... 21
%
0 ... 21 % H
2
, He,
N
2
, Ar
1.0 ... 1.1 bar Required
Not allowed;
with the
exception of
acetylene
and ethylene
oxide up to
100%
Zone 0 x
4 0 ... 4 % 0 ... 4 % He, N
2
,
Ar
1.0 ... 7 bar Not
necessary
Not allowed Zone 1 x
x = applies to the product
Identification of explosion protection
The gas chromatograph has a flameproof enclosure. With the flameproof enclosure, the
housing resists an internal explosion pressure.
The housing of your gas chromatograph has a rating plate which identifies the explosion
protection.
This device is approved for a sample gas inlet pressure of 1.6 bar absolute (160 kPa) in
accordance with ATEX II 2 G Ex d IIC T4.