11. Clearances
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 ZP7BMR-100R), then tests should be carried our to see if the beam is suitable.
12. Technical Data.
•
Operating Range ZP7BMR-50
5 to 50 metres
•
Operating Range ZP7BMR-100
50 to 100 metres
•
Supply Voltage
10.2Vdc to 30Vdc (Loop powered)
•
Quiescent Current (no lamp illuminated)
<5mA
•
Alignment current
<25mA
•
Fault Current
<15mA
•
Power Down Reset Time
>5 seconds
•
Operating Temperature
-30
°
C to 55
°
C
•
Tolerance to Beam Misalignment at 35%
Detector
±
0.8
°
, Prism
±
5.0
°
•
Fire Alarm Thresholds
2.50dB (25%), 3.74dB (35%), 6.02dB (50%)
•
Optical Wavelength
880nm
•
Head Maximum Size
Width 130mm, Height 210mm, Depth 120mm
•
Weight
740
gm
1 metre
diameter
clearance
0.5 metre diameter clearance down rest of beam path
Beam
Reflector(s)
First 20 metres
