16
MAN0530 Issue 10 - 11/09 Searchline Excel
2104M0506
Excel Gas Detector type Path length between units
Short Range 5 - 40m (15 - 130ft)
Medium Range 20 - 120m (65 - 390ft)
Long Range 120 - 200m (390 - 650ft)
The beam path and immediate surrounds should be kept free of obstructions that might hinder
the free movement of air in the protected area or block the infrared beam. A clear beam path of
20cm diameter or greater is recommended. In particular, for optimum availability, avoid areas
affected by the following.
a. Steam vents and plumes
b. Smoke stacks and chimneys
c. Walkways and personnel areas
d. Splash and spray, e.g. from moving equipment, cooling towers, etc.
e. Parking, loading, cranes, vehicle temporary stops, e.g. bus stops,
road junctions, etc.
f. Vegetation, e.g. shrubs, bushes, branches, etc. - if currently clear, movement
due to weather and future growth or planting must be considered
Note: Where c. and d. cannot be avoided, consider indicating the beam by marking the walkway
or road with paint.
Notes:
1. In order to t the alignment telescope, used during the alignment process, a clear
accessible arc of at least 50cm radius is required close to the unit’s cowling as shown.
2. A clear beam path of at least 10cm radius or greater is recommended.
3. INSTALLATION AND OPERATION
Unit cowl
Beam
clearance arc
- radius more
than 10cm
Telescope
clearance arc
- radius more
than 50cm
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