TM204
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Issue 1.1
5.2
Sounder Circuit Wiring
All sounders must be polarised type, if non-polarised sounders are used the control panel will
permanently show a fault condition. See table 4 for a list of compatible sounder types.
Sounder circuits are monitored for open and short circuit faults, by placing a 10K 0.25W end of line
monitoring resistor across the last device on the circuit.
Sounder circuits must be wired as a single, radial circuit with no spurs to enable the monitoring circuit to
work correctly.
+
-
SOUNDER
OUTPUT
TERMINALS
+ IN
- IN
+ OUT
- OUT
POLARISED
SOUNDER
See manufacturers
details for detailed
connection information
See manufacturers
details for detailed
connection information
+ IN
- IN
+ OUT
- OUT
POLARISED
SOUNDER
10K end of
line resistor
5.3
Using Intrinsically Safe Barriers
FireBeta XT+ control panels support the use of I.S. barriers for connecting to equipment in hazardous
areas.
Only certified detectors, call points and sounders may be used in hazardous areas and these must be
connected to the control panel via a compatible I.S. barrier as listed in table 5.
Connection of the I.S. barrier changes the characteristics of the detection circuit so zones that have I.S.
barriers connected must be adjusted to function correctly.
Programmable options C61 to C68 on the detection section allow each zone to operate with I.S. barriers.
The amount of detectors and call points that can be connected to a zone is limited by the I.S. approval
system diagram, which should be supplied by the detector manufacturer.
The power rating of the end of line resistor will be dependent upon the zone classification rating (Gas
class) this will be specified on the system diagram.