Siemens Maxum II Manual page 54

Valves, Detectors, and External Systems
4.4 Methanator
As described in section 2 of this manual, this higher pressure area prevents flammable vapors
and gases from entering the methanator.
When the purged/pressurized version of the methanator is installed, if the purge air supply
of the Maxum II is interrupted during operation, it is imperative that the analyzer be powered
down. Once powered down, the electronics enclosure door must be kept closed for at least
30 minutes. A 30-minute delay is necessary to give the methanator time to cool down
sufficiently. If the door to the electronics enclosure is opened prematurely, explosive gas or
vapor can ignite by entering the electronics enclosure and then entering the methanator
through the conduit tube. Never open the door when explosive gas or vapor is present unless
the methanator has had sufficient time to cool down.
Figure 4-9
(Explosion Proof Methanator) The more recent version of the methanator is designed with an
explosion proof/flameproof enclosure as described in the Definitions section of this manual
(section 1.9). This design eliminates the need to maintain a pressurized methanator enclosure
as well as reducing some of the necessary safety measures required for maintenance of the
Maxum II when a methanator is installed.
54
WARNING
Purged Methanator
Explosion Protection Safety Standards
Manual, August 2017, A5E02220442001 Rev 8