Bosch FAS-420-TT Series Operation Manual page 8

8 en | Technical specifications
Connecting to the FPA‑5000 Modular Fire Panel and programming using RPS software also
permit a dual-zone dependency.
Sensitivity
Three detector module versions are available for the FAS‑420 aspirating smoke detector
series:
–
–
–
Depending on the detector module used, the FAS-420-TT1 and FAS-420-TT2 models can
achieve a resolution ten times higher for displaying up to 0.05%/m (0.08%/m), 0.01%/m
(0.025%/m) or 0.0015%/m (0.005%/m) light obscuration. Further sensitivity levels to suit the
application range can be selected via the RPS programming software.
Notice!
The sensitivity value is based on measurements with standard test fires (old value in
brackets).
The new High-Power-Light-Source technology permits a broad detection spectrum over all
standardized fires.
LOGIC×SENS
The intelligent signal processing LOGIC·SENS distinguishes between deception variables and
fire events in order to prevent false alarms.
Reliable airflow monitoring
Analogous to point-type smoke detectors, which are monitored electronically for wire breaks
and short-circuits, highly sensitive and dependable airflow monitoring is required for smoke
aspiration systems. The airflow sensors used in the FAS-420 series reliably detect
malfunctions such as pipe breakage or obstructions in the air sampling openings.
Airflow monitoring is temperature-compensated and can be set depending on the air pressure.
The small airflow unit also contains a dynamic airflow sensor that enables a response to small
and fast changes in the airflow.
Patented air sampling openings
The air sampling openings of the pipe system require clearly defined bore diameters that
depend on the planning and design. These precise air sampling openings are created using
patented aspiration reducing film sheets, marking tape, and clips, which not only permit easy
installation, but also prevent "whistling" noises. Another advantage is the quick and easy
detection and checking of the air sampling opening diameters.
Point-type detector projection
The system's aspiration points can be equated with point-type smoke detectors. The
monitoring areas can therefore be planned in accordance with the applicable national
regulations.
Diagnostics
A system with FAS‑ASD‑DIAG Diagnostic Software, which enables quick and convenient error
containment, is available for maintenance and service. The current and stored (max. 72 hours)
unit status is read out to the diagnostic appliance via the unit's infrared port. The data is
transmitted from the diagnostic appliance to a laptop via a USB cable.
Selecting the fan voltage
The fan voltage for special planning can be increased from 6.9 V to 9 V by relocating the fan
jumper. This increases the air transport speed and therefore reduces detection time.
2020.04 | 6.1 | F.01U.029.275
DM‑TT‑50(80) with a response sensitivity of up to 0.5%/m (0.8%/m) light obscuration
DM‑TT‑10(25) with a response sensitivity of up to 0.1%/m (0.25%/m) light obscuration
DM‑TT‑01(05) with a response sensitivity of up to 0.015%/m (0.05%/m) light obscuration
Operation guide
Aspiration smoke detector LSN improved
Bosch Sicherheitssysteme GmbH