Siemens Maxum II Manual

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2.2.4 Purge Control ModuleThis is a manifold located on the right side wall of the electronics enclosure. It is located behindthe air circulating fan. There are two openings in the PCM manifold through which theelectronics enclosure is purged. The first is the "fast purge" opening which allows a largevolume of air to be passed through the enclosure quickly. The second is a smaller openingthat is equipped with a restricting orifice that limits the amount of air that flows into the enclosureto a level that maintains positive pressure without wasting air. This second opening is for the"normal" purge flow.“Normal Purge”Air Inlet(with orifice)“Fast Purge” AirInlet (threaded hole)Maxum II Airless/Airbath Maxum II Modular OvenFigure 2-6 Purge Control Module2.2.5 SYSCON or CIM and Purge Alarm LightWhen the PECM or PECM-DC detects insufficient purge pressure inside the enclosure, asignal is sent to the central processor board for the analyzer (either SYSCON or CIM,depending on configuration). The SYSCON or CIM then generates an alarm and flashes thepurge alarm LED on the front door of the Maxum II analyzer electronics enclosure. The purgealarm LED flashes red when an alarm is present.Old HMI DisplayNew Touchscreen DisplayFigure 2-7 Purge Alarm Indicator LampSafety Systems - Purging2.2 Electronics Purging System (without Automatic Purge Unit)Explosion Protection Safety StandardsManual, August 2017, A5E02220442001 Rev 8 23