Type Of Protection "Ex P - Siemens SIPROCESS GA700 Compact Operating Instructions

Safety instructions
2.4 General directives for explosion protection
the technical data of the respective device version. The exact specifications of the sample gas
inlet conditions can be found in the section "Technical specifications for operation in hazardous
areas (Page 96)".
Check the tightness of the containment system particularly prior to the introduction of
flammable sample gases after all installation and maintenance work.
2.4.2.2

Type of protection "Ex p"

For gas/air mixtures above the LEL, fault tolerance of the containment system is not guaranteed
in the sense of EN IEC 60079-2 and EN IEC 60079-14, for the sample gas can penetrate the
pressurized enclosure via leakages (e.g. O-rings). However, the release of sample gas can be
assessed as limited. The maximum quantity released is guaranteed by the quality assurance
measures of the manufacturer when the analyzer is delivered.
The maximum release amount of sample gas is:
Analyzer module
OXYMAT 7
ULTRAMAT 7
CALOMAT 7
In order to minimize or avoid the accumulation of gases in the enclosure, Ex p devices are purged
continuously with a ignition shield gas (purging gas). Inert gas or air is chosen as the purging gas.
During the pre-purging phase, before the device is switched on, the purging gas flows through
the enclosure in order to remove any combustible gases that may be present. During the
operating phase the purging gas continues to be fed into the enclosure. This dilutes any sample
gas released through leaks so that an ignitable gas mixture cannot arise.
The specifications for the purging gas are available under: Technical specifications for operation
in hazardous areas (Page 96).
Explosion hazard
The following applies for simplified pressurized devices with type of protection Ex pz for use in
hazardous Zone 2 and Zone 22:
• Never insert combustible gas/air mixtures whose composition lies above the LEL even
20
WARNING
occasionally!
Max. release amount
200 μl/min
500 μl/min
400 μl/min
Compact Operating Instructions, 01/2022, A5E35134047-11
Devices in explosion-proof design