EQUIPMENT: DUO-CEL WRITTEN BY: RKP
PUBLICATION: OM_DUO-CEL_INST CHECKED BY: AJC
ISSUE No. & DATE: 2 13/10/10
PAGE 6 of 30
The end-of-line monitoring device will depend on
the zone configuration of the panel. Correct polarity
must be strictly observed throughout.
3.8.1 Standard Panel Default Zone
Configuration
The Default Zone Configuration (factory Default)
on the standard panel uses active fault monitoring,
with a 10uF capacitor as the EOL device. This
allows the maximum number of detectors to be
used (up to 32 per zone) and maintains line
continuity (via diodes fitted to detector bases) when
a detector head is removed.
3.8.2 Standard Panel Resistor Zone
Configuration
The Resistor Zone Configuration on the standard
panel can be selected by DIL switch and uses
passive fault monitoring, with a 6K8 to 3K9 resistor
as the EOL device. The number of detectors is
restricted by the total current drawn by the
detectors, which must not exceed 1.6mA. Line
continuity cannot be maintained when a detector
head is removed.
3.8.3 Twin-Wire Panel Zone
Configuration
The Twin-Wire panel uses passive fault monitoring
but with an EOL device consisting of a zener diode
and resistor as shown in Figure 5. The device is
polarised and should not be connected in reverse
(otherwise the panel will indicate an alarm
condition). This EOL device allows monitoring for
detector head removal whilst maintaining line
continuity via diodes fitted to detector bases.
Only use detector bases with 1N4002 line
continuity diodes fitted.
DO NOT leave any diode bases empty. Detectors
should be fitted or a blanking plate which links out
the diode should be fitted.
NOTE: The twin-wire EOL will draw up to 4mA
from the zone in quiescent and this should therefore
be added to the total zone current when calculating
the standby battery requirements.
Figure 5 – Twin-Wire EOL device
3.8.4 Maximum Number of Devices on
a Zone
For the standard panel with 10uF EOL capacitor,
the maximum number of detectors & MCPs per
zone is limited to 32 or less (see DUO-CEL
Application Guide).
For the standard panel with EOL resistor, the
maximum number of devices allowed on a zone is
limited by the quiescent current drawn by each
device. The quiescent current will be listed on the
device data sheet provided by the Manufacturer of
the device.
The maximum quiescent current available to power
devices on a zone is 1.6mA. Exceeding this value
will prevent the panel from correctly monitoring for
open circuit fault conditions.
For the Twin-Wire panel the maximum number of
detectors & MCPs per zone is limited to 16 (or less,
see DUO-CEL Application Guide) if sounders are
also connected. If no twin-wire sounders are on the
zone then up to 30 detectors & MCPs may be
connected (see DUO-CEL Application Guide for
details). The maximum number of twin-wire
sounders permitted is 12 (or less; see DUO-CEL
Application Guide).
Note: It is a recommendation of BSEN 54-2 that
there should be no more than 32 detectors &
MCPs in a zone.
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