17Chapter 4 Siting Considerations
Searchline Excel™ Plus / Searchline Excel™ Edge – Technical Manual
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 10 cm (3.9 in) in radius or greater is recommended.
In particular, for optimum functionality, avoid areas affected by the following:
1. Steam vents and plumes
2. Smokestacks and chimneys
3. Walkways and personnel areas
4. Splash and spray, e.g. from moving equipment, cooling towers
5. Parking, loading, cranes, vehicle temporary stops, e.g. bus stops, road junctions
6. Vegetation, e.g. shrubs, bushes, branches – if currently clear, movement due to weather and future growth or planting
must be considered
Note
Where 1. and 5. cannot be avoided, consider indicating the beam by marking the walkway or road with paint.
In order to fit the alignment scope used during the alignment process, a clear accessible arc of at least 50 cm (1.64 ft)
in radius is required close to the unit’s cowling as shown.
Alignment scope
clearance arc
- radius more
than 50 cm (1.64 ft)
Unit cowl
Beam
clearance arc
- radius more
than 10 cm (3.9 in)
Figure 4.Beam clearance arc
4.3Supporting Structure
The transmitter and receiver units must be fixed using a suitable mount.
Note
The maximum movement of the supporting structure under all anticipated operating conditions must be ±0.5°.
If either unit is to be free standing and not mounted to existing supports or structures, and the height above the ground is
no more than 3 m (9.5 ft), the supporting structure shown is recommended:
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