Fire Alarm Computer 8000C / M
Page 43
5.1.2 Sensor functions (loop)
Using this function, detector sensors of the multisensor fire detector such as all O sensors (Optical
= photoelectric sensor) or all I sensors (I = ionisation smoke sensors) or in OHI multisensor
detectors the OI sensor combination in an analog loop can be switched off.
Disconnecting sensors is only possible for OH and OHI multisensor fire detectors. These fire
detectors are fitted with two or three different sensors.
If, for example, OHI multisensor detectors are disconnected with the function OI sensors off, only the
third sensor - the H sensor (heat detector) - remains active. Disconnecting the heat sensors (H
sensors) is not possible.
Fig. 46: Sensor functions reladed to primary loops
O detector
⇒
Optical fire detector with a single sensor (photoelectric sensor)
T detector
⇒
Heat detector with a single sensor (Thermosensor)
I detector
⇒
Ionisation smoke detector with a single sensor (Ionisation sensors)
OT detector
⇒
Multisensor fire detectors with two various sensors
(OT= Photoelectric and Thermosensor)
OTI detector
⇒
Multisensor fire detectors with three various sensors
(OTI= Photoelectric-, Thermo- and Ionisation sensors)
☞
Switching off sensors is only possible for OH and OHI multisensor fire detectors. If
multisensor fire detectors and standard detectors (detectors with a single sensor) are
installed together in an analog loop, only the sensor in multisensor detectors are switched
off.
Service Level
Sensors (loop)
Primary loop :
Escape Function
1 O -Sensor off
2 OI-Sensor off
3 I -Sensor off
4 Sensors on
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