Menvier Security MAB50R, MAB100R Installation Manual
www.acornfiresecurity.com
www.acornfiresecurity.com
MAB50R & MAB100R
Reflective Beam Detectors
FEATURES
• Microprocessor
controlled
• Range 5 – 50 Metres
• Range 50 – 100 Metres
• Unique simple alignment
•
Loop powered
•
Selectable alarm
thresholds
•
Low current
consumption
• Automatic contamination
compensation
22318.37.01 15.09.05
Addressable
www.acornfiresecurity.com
www.acornfiresecurity.com
Installation Guide Index
Section
1. System Description (page 2)
2. System Operation (page 2)
3. Detector Positioning (page 2 to 4)
4. Installation (page 4 & 5)
5. Prism Targeting (page 5)
6. Alignment (page 5 to 7)
7. System Testing (page 7)
8. Connection and configuration Settings (page 8)
9. Detector Back View (page 9)
10. Beam Clearance (page 10)
11. Technical Data and short circuit isolator (page 10 & 11)
12. Service/Application Notes (page 11)
13. Parts List (page 11)
22318.37.01 15.09.05
1
www.acornfiresecurity.com
www.acornfiresecurity.com
1. System Description.
Cooper Lighting and Security MAB50R / MAB100R detectors comprise a Transmitter and Receiver contained
within one enclosure.
The Detector installs to the building fabric between 0.5 and 0.6 metres from the ceiling.
The Transmitter emits an invisible infrared light beam that is reflected via a prism mounted directly opposite and
within a clear line of sight. The reflected infrared light is detected by the Receiver and analysed.
The Detector has maximum lateral detection of 7.5 metres either side of the beam.
2. System Operation.
Smoke in the beam path will reduce the received infrared light proportionally to the density of the smoke. The
Detector analyses this attenuation or obscuration of light and acts accordingly.
Alarm thresholds of 25%, 35%, and 50% can be selected to suit the environment, where 25% is the most
sensitive. If the received infrared signal reduces to below the selected threshold, and is present for
approximately 10 seconds, a Fire condition is activated.
The Fire condition will automatically reset after 10 seconds once the beam signal increases above the selected
fire threshold.
If the infrared beam is obscured rapidly to a level of 90% or greater for approximately 10 seconds a Fault
condition is activated.
This condition can be entered in a number of ways, for example, an object being placed in the beam path,
transmitter failure, loss of the prism, or sudden misalignment of the Detector. The fault condition will reset within
5 seconds of the condition being rectified.
The Detector monitors long term degradation of signal strength caused by component ageing or build up of dirt
on optical surfaces. This operates by comparing the received infrared signal against a standard every 15
minutes; differences of less than 0.7dB/Hour are corrected automatically.
3. Detector Positioning.
It is important that the MAB50R / MAB100R detectors are positioned correctly to minimise the detection time.
Experiments have shown that smoke from a fire does not rise directly upwards, but fans out or mushrooms due
to air currents and heat layering effects. The time to signal a fire condition depends on the location of the
Detector within the premises, the volume and density of smoke produced, construction of the roof, ventilation
arrangements and airflow within the detection area.
Smoke layering, where smoke does not reach the ceiling level due to layers of static hot air is overcome by
mounting the Detector/Prism(s) at the recommended height below the ceiling of between 0.5 and 0.6 metres,
bringing the infrared beam below the heat layer and into the smoke layer. However, if there are objects below
the ceiling that could obscure the beam path, the detector/prism(s) positioning may need to be adjusted. This is
to allow for a beam path clearance radius of 0.5 metres.
The maximum distance either side of the beam axis is found to be typically 7.5 metres for satisfactory detection
under flat ceilings.
Single Beam
15 m
0.5 to 0.6 m
0.5 ↔ 7.5 m
Multiple Beams
15 m
0.5 ↔ 7.5 m
22318.37.01 15.09.05
2
www.acornfiresecurity.com
www.acornfiresecurity.com
Typical Minimum Beam Spacing
Beam Distance Beam Spacing Beam Distance Beam Spacing
10 0.87m 60 5.25m
20 1.75m 70 6.12m
30 2.62m 80 7.00m
40 3.50m 90 7.87m
50 4.37m 100 8.75m
In all installations the latest national fire standards must be consulted. If there is any doubt on the correct
mounting height, positioning may be determined by smoke tests.
3.1. Detector Positioning In Apex Of Sloping Ceiling.
A ceiling is defined as sloping if the distance from the top of the apex to the intersection of the ceiling and
adjacent wall is greater than 0.6 metres. See Fig. 1.
Υ Υ
Χ
Slope if Χ ≥ 0.6 Metres
=
+
Fig. 1. Fig. 2.
Φ
When a Detector is positioned in the apex of a ceiling (See Fig. 2), the lateral beam distance covered (Υ) can
be increased in relation to the angle of pitch (Φ), up to a maximum of 25%.
For Example:
If the pitch angle is 20 degrees, the lateral coverage can be increased from 7.5 metres either side of the beam
(Υ) to:
Υ = 7.5 + (7.5 x 20/100) metres
Υ = 9 metres
Therefore, with a roof pitch of 20 degrees the lateral coverage can be increased from 7.5 metres either side of
the beam to 9 metres either side of the beam, but only for the beam positioned in the apex. All other
calculations remain the same.
Limit to when a beam detector must be positioned in
Angle of
Pitch
in degrees
22318.37.01 15.09.05
35.0
30.0
25.0
20.0
15.0
10.0
5.0
0.0
0 5 10 15 20 25
Beam detector must be positioned in apex
Roof can be defined as flat
roof apex
Width of Room in metres
3
Loading...