AVENAR detector 4000 System Overview | en 7
Bosch Sicherheitssysteme GmbH
User manual
2023-06 | 07 | F.01U.283.550
2 System Overview
Figure2.1: Detector set-up
1 Smoke measurement chamber with
optical sensor
4 Individual display
2 Thermal sensor 5 PC board with evaluation electronics
3 Chemical sensor (covered on the cross-
section)
6 Detector Base
2.1 System Description
Up to three characteristics are integrated in the detector variants of AVENAR detector 4000:
– Optical (for smoke): O
– Dual-optical (for smoke): DO
– Thermal (for heat): T
– Chemical (for CO gas): C
Rotary switches (R) enable automatic or manual address setting: FAP-425-O and FAP-425-OT
are not fitted with rotary switches, but FAP-425-O-R and FAP-425-OT-R are fitted with rotary
switches.
The individual sensors are programmed via the LSN network manually via the FSP-5000-RPS
programming software. All sensor signals are analyzed continually by the internal signal
analysis electronics (ISP) and are linked with each other. By linking the sensors (combined
detectors), the detector can also be used in places where the work carried out gives rise to
light smoke, steam or dust. If a signal combination fits the selected identifier for the area of
operation for the detectors, an alarm is triggered automatically.
In order to adapt its sensitivity to the set threshold value the LSN improved detector monitors
and adjusts itself permanently throughout its life cycle.
A message is sent to the fire panel if the detector becomes too contaminated.
2.2 Functional Description of the Sensor Technology
2.2.1 Optical Sensor (Smoke Detector)
This optical sensor utilizes the scattered-light method.
An LED sends light into the measuring chamber, where it is absorbed by the labyrinth
structure. In the event of a fire, smoke enters the measuring chamber. The light is scattered by
the smoke particles and hits the photo diode, which transforms the quantity of light into a
proportional electrical signal.
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