Apollo 55000-268, Installation Manual

Page: 17 / 22

17
COMMISSIONING
Analogue values
The beam detector returns a pre-set analogue
value corresponding to its status. These values
are defi ned in Table 4 below.
The beam detector may return a pre-alarm
value before a full alarm condition occurs. The
analogue value depends on the smoke density
and the set obscuration level (described on page
7) as shown in Table 5.
Analogue value Signifi cance
0 Microprocessor fault
1 Sensor fault
2 Prism (refl ector) targeting mode
3 Alignment mode
4 General fault warning
5 ‘Signal High’ fault
6 Contamination compensation limit reached
20 Alignment drift negative
25 Detector normal
30 Alignment drift positive
32 Contamination compensation level low (40%)
33 Contamination compensation level medium (60%)
34 Contamination compensation level high (80%)
45–54 Pre–Alarm values (see Table 5 below)
64 Alarm
Table 4
Analogue value returned Actual obscuration at set
obscuration level of
25% 35% 50%
45 16 23 33
46 16 26 34
47 17 27 35
48 18 28 36
49 19 29 38
50 20 30 40
51 21 31 42
52 22 32 44
53 23 33 46
54 24 34 48
Table 5 Percentage of obscuration indicated by pre-alarm