Fast Purge Pressure Relief Valve; Figure 2-10 Pressure Relief Valve For Py Purge - Siemens Maxum II Manual

2.2.7

Fast Purge Pressure Relief Valve

The pressure relief valve, which is shown in the following figure, is located either inside the
detector enclosure (middle door or a Maxum II with Airbath/Airless oven) or inside the top left
of the electronics enclosure for a Maxum II Modular Oven. The location of the pressure relief
valve within the analyzer is shown in Figures 2-1 and 2-2. This valve allows excess air to
escape from the pressurized enclosure in order to prevent over-pressurization. Note that in
"normal" purge mode, the relief valve may not open. This is due to small amounts of air that
may escape from other points and is not a problem as long as adequate positive pressure is
maintained. Note the old and new style valves shown below. The new valve is shown with the
exhaust diffuser on top of the analyzer. It is designed with downward-facing holes and a metal
screen to prevent dust and other foreign material from accumlulating in the relief-valve exit
port.
Figure 2-10
Explosion Protection Safety Standards
Manual, August 2017, A5E02220442001 Rev 8
2.2 Electronics Purging System (without Automatic Purge Unit)
Old Pressure relief valve, MAA
(Inside Detector Compartment)
Old Pressure relief valve, MMO
(Inside Air Input Panel)
Pressure Relief Valve for PY Purge
Safety Systems - Purging
New Pressure relief valve, MAA and MMO
(mounted on top left of electronics enclosure)
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