e1901a
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Fire & Security Products
Siemens Building Technologies Group 06.2001
9.3 Application
Due to its EN54 compliance the PolyRex detector DOT1151-Ex can be used as an univer-
sal detector. The recommended monitoring surfaces, detector spacing, etc. can be found
in the national guidelines, the Cerberus planning and application guidelines (CRP), or the
Security Guide.
9.4 Wiring
The DOT1151A-Ex detector and the DB1151A base are used in DS11-Ex with intrinsically
safe fire detection lines which consist of an E3M171 line module, a shunt Zener diode bar-
rier and intrinsically safe detectors.
Non-Ex-detectors mayalso be installed before the shunt Zener diode barrier. After the shunt
Zener diode barrier only Ex detectors (DOT1151A-Ex, DT1151A-Ex, DM1153/54-Ex or
DF1151-Ex) may be connected. A maximum of 32 devices with IMK1 may be connected to a
stub line (total of all devices before and after the shunt Zener diode barrier). T-branches (T-TAP)
are admissible. The Ex devices do not have a disconnection function.
Within the explosion-hazard area per detector base DB1151A only one external response
indicator DJ1191-Ex, DJ1192-Ex or AJUT24-Ex may be connected.
Wiring comprises of a twisted two-wire circuit without shielding. If shielding is used, the
shielding must be earthed on one side at the equipotential bonding.
Further information about installation in explosion-hazard areas can be found in the docu-
ment e1204.
Line module
Auxiliary
terminal
DB1151ADB1151A
DJ1191-Ex
+–
DB1151A
DB1151A DB1151A
Explosion-hazard area
Non-hazardous area
+
–
AJUT24-Ex
+–
E3M171 DB1151A
DJ1192-Ex
SB3
Shunt Ze-
ner diode
barrier
Equipoten-
tial bonding
(PA)
max. 70nF / 4mH
Fig. 5 Connection diagram
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