FP1500 Installation, Configuration and Commissioning Manual
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If necessary, the fire panel has an auxiliary 24 VDC output. It allows powering of
additional elements that cannot be powered from the loop. It is also possible to connect
such elements to an independent power supply.
3.5.4 Connecting
sensors
The analogue addressable sensors are the elements of the system that gather the
information. There are two types of detection elements: Thermal, which is activated by
temperature changes; and smoke (ionisation and optical), which is sensitive to smoke.
They all have a microprocessor that enables them to manage themselves and to
communicate with the fire panel.
Up to 125 sensors can be installed on the loop. Each of them occupies a physical
address on the loop from 1 to 125.
The number of sensors installed on a loop must be in accordance with local
regulations.
(It is recommended that you carefully read the technical specifications and the assembly
and installation manuals included in the packing of every product.)
Sensitive to smoke:
DI1552: Operates by the imbalance of its ionisation chambers in the presence of smoke.
DP1551: Operates by light dispersion due to the presence of smoke (Tyndall effect).
Sensitive to temperature:
DT1553: It is activated when a fixed temperature level is exceeded or when the
temperature rate-of-rise surpassed a pre-set rate.
Combined action:
DP1551T: Optical-thermal dual sensor that intelligently combines a photoelectric and two
thermal measurements to detect an ample spectrum of types of fire.
The loop ground connection
O+
O-
R+
R-
End of shield
well protected
Each connection of the loop must give
continuity to the shield.