Beam Clearance - Menvier Security MAB50R Installation Manuals

10. Beam clearance.

Most reflective beams produce a focused beam to a reflector on the opposite side of the protected area. The
returned signal is then sampled and any obscuration calculated. If there are highly reflective surfaces, or
objects near the beam path, there may be a possibility that some of the beam energy is inadvertently reflected
into the receiver, rather than via the reflector. This may increase the possibility of faults or false alarms. Hence
the importance of following the recommendations in Section 5 of this installation guide.
It is, for this reason, recommended that the beam path should be surveyed to confirm that a reflective beam can
be used. As a general rule of thumb there should be at least 0.5m diameter clearance down the entire beam
path. If there are highly reflective objects within 1 metre diameter of the beam path for the first 20 metres of the
beam path (for the MAB100R), then tests should be carried our to see if the beam is suitable.
First 20 metres
1 metre
diameter
clearance
Beam
11. Technical Data.
•
Operating Range MAB50R
•
Operating Range MAB100R
•
Supply Voltage
•
Quiescent Current (no LED's illuminated)
•
Alarm Current
•
Alignment Current
•
Power up Time
•
Operating Temperature
•
Tolerance to Beam Misalignment at 35%
•
Fire Alarm Thresholds
•
Optical Wavelength
•
Head Maximum Size
•
Weight
22318.37.01 15.09.05
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0.5 metre diameter clearance down rest of beam path
5 to 50 metres
50 to 100 metres
18-30Vdc
<5mA
<9mA
<18mA
approx 10 seconds
-30°C to 55°C
Detector ± 0.8°, Prism ± 5.0°
2.50dB (25%), 3.74dB (35%), 6.02dB (50%)
880nm
Width 130mm, Height 210mm, Depth 120mm
740 gm
10
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Reflector(s)