Siemens MicroSAM, Operating Instructions Manual, Page: 15 / 138

General information
2.4 Protection against explosion
MicroSAM
Operating Instructions, 06/2012, C79000-G5376-C560-07
13
WARNING
Explosion hazard

The device is designed to analyze flammable and non-flammable gaseous media.
Hydrogen or inert gases are used as auxiliary gases.

For the analysis of flammable gases or use of hydrogen as a carrier gas, oxygen may
only be present in concentrations ≤ 2% in the sample.

Oxygen at concentrations up to 21% and pressure up to 1.1 bar (110 kPa) is permissible
for operation only if an additional constructive explosion protection measure is
implemented, for example, installation of a flame arrester between the process
connection and gas chromatograph.

Oxygen at concentrations up to 21% and pressure > 1.1 bar (110 kPa) is not allowed
under normal operating conditions for explosive mixtures.

The pneumatic conditions for the sample and the auxiliary gas must be strictly observed:
– Sample gas ≤ 1.6 bar (160 kPa) absolute pressure
– Auxiliary gas ≤ 8 bar (800 kPa) absolute pressure

If flammable gases are connected at a pressure > 1.1 bar (110 kPa), the chromatograph
and the gas line must be purged with process gas prior to analysis.

Flammable gases which are explosive under the analysis conditions even with the
exclusion of oxygen (acetylene and ethylene oxide), may only be present in the
analyzed mixture in concentrations that are uncritical for safety-related engineering.
Acetylene and ethylene oxide can be present in a concentration up to 100%.

The permissible ambient temperature range is -30° to +55° C.

The temperature range for continuous operation is -20 °C to +50 °C.