Information On Commissioning; Ignitable Gases In The Enclosure - Siemens SIPROCESS GA700 Kompaktbetriebsanleitung

6.3

Information on commissioning

Note
Sample gas pressure increase influences the sample gas pressure switch
At the time of delivery of an OXYMAT 7 analyzer module, the internal pressure switch for
reference gas monitoring is preset to approx. 2000 hPa (3000 hPa abs.). Changes in the
sample gas pressure in the analyzer module by more than 150 hPa require a change in the
pressure switch switching point by the same amount. The monitoring functionality of the
reference gas pressure switch is modified as a result.
• For changes to the sample gas pressure, contact the Service (Page 120).
• Have the pressure switching point of the reference gas pressure switch adjusted by a
Siemens technician or someone trained for this case.
Note
Ambient temperature
Ensure that the ambient temperature is within the permissible range during operation. The
corresponding information is available in the section "Technical specifications (Page 93)".
The technical specifications of the device can deviate outside these temperature limits.
Operability of the device is no longer ensured at deviations of more than 5 K.

Ignitable gases in the enclosure

Ignitable gases are gases with a gas concentration of more than 25% of the lower explosion
limit (LEL).
Under normal ambient conditions, the LEL is the danger threshold when handling these
gases. Special operating conditions can lower the risk potential of these gases below the
LEL. A value of 25% of the LEL is regarded as definitely safe.
Do not introduce combustible or ignitable gases into devices that are approved for operation
in ignitable dust atmospheres (type of protection Ex t),
Safety device for the pressurized enclosure in Zone 2
An unsuitable safety device for the pressurized enclosure in Zone 2 can result in the danger
of explosion in hazardous areas. Therefore, observe the following instructions:
● If you do not introduce combustible gases or gas/air mixtures (sample gases) into the
device, use the type of protection "Simplified pressurized enclosure Ex pz" in Zone 2.
● If you introduce combustible gases or gas/air mixtures (sample gases) that are
occasionally ignitable into the device, use the type of protection "Pressurized enclosure
Ex px/py".
● Purge the device with an approved safety device in accordance with the specifications in
the section "Technical specifications for operation in hazardous areas (Page 107)".
Devices in explosion-proof design
Compact Operating Instructions, 11/2019, A5E35134047-04
Commissioning
6.3 Information on commissioning
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