SYSTEM DESIGN INFORMATION
19
The front section of the enclosure is fitted with a window guard plate to protect the two detector
viewing windows. A locally formed section of this plate acts as a mirror for the Optical Path
Monitoring test. This plate also contains the mandatory markings required by the Flameproof and
Explosion Proof Regulatory standards (ATEX, IECEx and FM).
The detector may be fitted directly to a suitable surface or an optional adjustable mounting bracket
may be used. An optional weather hood is available for use where protection against extreme
environmental conditions such as hot sun or downpour is needed.
A weather hood is available for use in tropical climates where intense sunlight may occur (Fig. 18).
It also provides protection from rain falling on the window.
Fig. 17 FV311 Bottom Section
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