FIRERAY
PRODUCT GUIDE
Page 18
5.3
Optical Cross Talk
Optical Beam Smoke Detectors should be positioned adequately to avoid the infrared light beam
from other Optical Beam Smoke Detectors falling on the detector, either directly or indirectly.
Mounting Receivers or Reflectors back to back creates a high possibility for infrared light overspill
If a pair of Optical Beam Smoke Detectors is to be used to cover a “long jump”’ then Transmitters
should be position back to back
5.4 Sensitivity
Sensitivity is the smoke obscuration (% / metres) over a distance (metres)
The Optical Beam Smoke Detector’s working environment (dust, humidity, etc) is an element to be
considered whilst selecting sensitivity.
5.5 Sunlight
/
Artificial Lights
Light sources of extreme intensity such as sunlight and artificial lamps, if directed to the Receiver,
can cause a dramatic signal change resulting in fault and alarm signals.
Pointing the Receiver to the rising or setting sun should be avoided.
If possible, the exposure should be North/South.
If the sunlight cannot be avoided, the Receiver should be mounted slightly higher than the
Transmitter or Reflector, causing the Receiver to look below the horizon
5.6 Heat
Sources
Sources of high heat level can affect the line of sight between Transmitter and the Receiver and may
have the adverse effect on the performance of the Optical Beam Smoke Detector
If possible, heat sources need to be placed as far away as possible to the line of sight in order to
avoid the potential of the heat haze distorting and attenuating the infrared structure.
Summary of Contents for FIRERAY 100R
Page 2: ......
