OSI-RI-FL Installation Guide
OSI-RI by Fire-Lite Alarms
30
E56-6584-001 | October 2018
12.3 Fine Adjustment
It is important to be well aligned as the IR power drops rapidly out of the centre of the beam.
The maximum beam size is dependent on the distance (D) between detector and reflector and can be
calculated as 0.07x D.
Example, at 70 m/230 ft., the diameter of the beam will be +/- 5m/16.4 ft.
Reflector
Power distribution
Beam
power
Half power beam size
Center area of the beam
Maximum beam power
D
p
D
m
IR
p
full power angle is +/-1°
IR
m
half power angle is +/-3.5°
Diameter D
p
= Beam length x 0.035
Diameter D
m
= Beam length x 0.06
Figure 12-2: Beam Power Distribution
The 4 arrows will intuitively guide the user to optimal eyeball alignment. All arrows and the middle green LED
must blink green for the eyeball to be optimal aligned. Likely the alignment process will start with all arrows
red.
Figure 12-3: Arrow Array
Gently move the eyeball and let the arrow’s colour, changing colour red to orange to green, as the alignment
improves guide you till the all arrows and the middle LED turn green.
Example:
Reflector
Maximum beam power
Maximum beam size
Fully aligned
Direction to move eyeball
Figure 12-4: Arrow Array Color Alignment Guidance
Summary of Contents for OSI-RI-FL
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