Apollo 55000-024 Instrukcja instalacji i konserwacji - Strona 3
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Sensitivity setting
A sensitivity switch is used to set the sensitivity of the IR
For most practical purposes the switch should be set to Class 1 (default setting), the sensitiv-
ity required to detect flames as described in the section 'Quantities required and position-
ing of detectors'.
In exceptional cases the IR
Flame Detector may be set to Class 3 operation in order to
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avoid nuisance alarms being caused by radiation sources that are close to the detector
and can not be moved.
The rotary sensitivity switch is located on the detector rear behind the label. To set to Class
3, rotate the switch 90° clockwise. To return the sensitivity switch to the Class 1 setting,
rotate the switch 90° counter clockwise. Reseal label or seal hole with suitable sealant if the
sensitivity has been changed.
Installation
The IR
Flame Detector is mounted on any XP95 or Discovery base and would normally be
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wall or ceiling mounted preferably on an adjustable bracket to adjust the angle of view.
The standard base mounting is used for horizontal viewing, e.g., along corridors or along
the length of industrial processes or vertical viewing inside fume cupboards or over
hoppers.
Flame detectors should be fitted to solid walls or rigid constructions that do not move and
are not subject to vibration.
The IR
Flame Detector must be assigned an address by addressing the XPERT card in the
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usual way. A list of address settings is shown in Table 2.
Wiring
The flame detector has five connections: – Line 1, + Line 2, +Remote, –Remote and func-
tional earth/screen. The connections are accessed by removing the detector from it's
base. See Fig 4 for connection diagram.
From control panel
© Apollo Fire Detectors Limited 1997-2007/RHD/TP
Fig 4 IR
Flame Detector base connections
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Terminal Descriptions
1
+L2
+Line IN and OUT
2
–L1
–Line IN and OUT
3
+R
+Remote LED
4
–R
–Remote LED
5
EARTH
Functional Earth/Screen (Isolated)
Flame Detector to Class 1 or Class 3.
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R+
R–
L1
To next device
EARTH
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Quantities required and positioning of detectors
The number of detectors required and their positioning depends on:
•
the anticipated size of the flame
•
the distance of the flame from the detector and
•
the angle of view of the flame detector
The IR
Flame Detector is designed to operate to Class 1 performance as defined in EN54:
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Part 10. The detector will, therefore, detect a yellow flickering flame of approximately 0.1m²
or a clear flame of 0.25m² at 25m.
In fact, the flame detector will detect fires at distances of up to 40 metres, but the flame
size at such distances needs to be proportionally greater in order to be sure of reliable
detection. Thus the yellow flickering flame that can be detected at 25m, provided that
its size is not less than 0.1m², will have to be 0.4m² in order to be detected at 40 metres. In
a rectangular room the distance from the flame detector to the fire is calculated by the
formula:
L² + W² + H²
In the example shown in Fig 1 the room in which the flame detector is to be installed
measures 20m x 10m x 5m; the distance from the detector to the flame will therefore be:
20² + 10² + 5²
= 22.9m
Height
Width
Length
Fig 1 Calculation of distance from detector to flame
The IR
Flame Detector is often positioned at the perimeter of the room, pointing directly at
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the area of the anticipated flame or at the centre of the area to be protected. If the detec-
tor cannot 'see' the whole of the area to be protected, one or more additional detectors
may be required.
The IR
Flame Detector is not affected by normal light sources but should be positioned so
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that sunlight does not fall directly onto the viewing window.
© Apollo Fire Detectors Limited 2000-2005/RHD
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