Eltek Delta OP - Appendix: Intelligent System Logic; Intelligent DELTA Logic+ Features; Adjusting Alarm Limits and Verification

5 Appendix
36 User’s Guide '(/7$23
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In order to make secure and stable operation of fire alarm installation easier and to
prevent undesired alarms, even in difficult environments, (OWHN)LUH6DIHW\ has
developed '(/7$/RJLF, a further development of our )LUHJXDUG/RJLF system.
'(/7$/RJLF is collective expression used to cover the environmental
adaptation features on offer with the DELTA concept, and incorporates the three
main functions set out below.
A key feature of '(/7$/RJLFis the option it gives you of adjusting areas of the
protected premises to provide greater sensitivity so that you achieve the benefits of
early warning (greater security in sensitive areas). Another great feature is the
automatic environmental compensation built-in the 'LVFRYHU\ range of detectors.
'(/7$/RJLFhas the following main properties:
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Pre-alarm and fire alarm detection levels can be adjusted individually at the
control panel, within acceptable limits, for each analogue detector.
This property makes it possible to use smoke detectors in areas where some smoke
may be present.
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This function allows you to individually adjust at the control panel how long an
analogue detector may report a pre-alarm or fire alarm before the fire alarm panel
raises the alarm.
This property makes it possible for some areas to have high temporary
concentrations of smoke without notifying an alarm. The fire alarm panel stores
the highest and lowest smoke concentration levels for any detector.
Time
55
45
8
Analogue Value
$/$50
35($/$50
1250$/
)$8/7
Standard Limits
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65
30
8
$/$50
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35($/$50
1250$/
)$8/7
Time
Analogue Value
Adjusted Limits
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$/$50
35($/$50
1250$/
1
10 (std)
60
Analogue Value
Time