Technical data

18 en | Connection
Automatic Fire Detectors LSN improved
version
F.01U.003.449 | 7.2 | 2010.05 Product Information Bosch Sicherheitssysteme GmbH
5.4 Detector Base Sounders
Detector base sounders are used if acoustic alarm signaling is required directly at the fire
source. Detector base sounders are available in four variants.
– MSS 300 Detector Base Sounder White, for
conventional line technology, activation via the C point
of the detector in use.
– MSS 300 WS-EC Detector Base Sounder White, for
conventional line technology, with external activation
(via an interface module).
– FNM-420-A-BS Detector Base Sounder White or Red, for
LSN line technology, with power supply via the LSN
with 32 different tones.
– MSS 401 Detector Base Sounder White, for LSN line
technology, with separate power supply.
The integrated tone generator has 11 tones for selection
(incl. tones conforming to DIN 33404 and EN 457) with
sound pressure of max. 100 dBA, depending on the type of
tone selected.
With the LSN variants, the volume (4 levels) and also the
tone type are programmed via the fire panel. The tone type
on conventional variants is set via four DIP switches and the
volume is adjusted continuously via a potentiometer.