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GASSONIC OBSERVER-i
12
3.0 Installation
3.1. Mechanical
Construction
The Gassonic Observer-i consists of two chambers. Both chambers are certified as flameproof (Ex d)
and Explosion-proof (XP). The cables are connected through M20 x 1.5 6H cable entries in the top
chamber using approved Ex d glands or approved conduit with seals installed within 18” of the
detector. The inner cores of the cable penetrating the detector should be at least 25 cm long. This will
ensure no tension on the wires and connector PCB when the top chamber is opened. The two
mounting bolts are on the top chamber of the detector so that the cables will enter on the fixed part of
the detector. The bottom part is attached to the top by means of six Allen screws with lock washers.
Unscrewing these screws will expose the connector PCB in the top chamber. These screws will be
fixed by retaining washers to the bottom chamber. The bottom chamber of the detector is supported by
the load-strap, which is connected to the top chamber.
The bottom chamber contains integral associated intrinsically safe apparatus limiting energy to an
intrinsically safe microphone and piezo source, mounted to the exterior of the enclosure.
Figure 2: Mechanical Construction – Internal