Data Sheet for Product

Siemens Data Sheet 6152
Smart Infrastructure - Building Products usa.siemens.com/fire
Desigo® Fire Safety
Detectors and Peripherals
Photoelectric Smoke Detector
Model FDO421
Model FDO421-
Photoelectric Smoke Detector
Architect & Engineer Specifications
 UL 268 7
th
edition Listed
 Built-in ISOtechnology™
 252 Isolation devices per SLC
 Compatible with `H’-series devices on the
same loop (with Desigo Fire Safety series
fire-alarm control panels)
 Compatible with Model DPU (device
programmer / loop tester)
 Each detector is self-testing:
- self-monitored for sensitivity
with UL Listed limits
- complete diagnostics performed
every 10 seconds
 Polarity insensitive via SureWire™
technology
 Functions with Model DB-11–series
mounting bases
 Tri-color detector-status light-emitting
diode (LED) with 360
° view
 Field-selectable application - sensitivity profiles
 Remote sensitivity - measurement capability
 Utilizes advanced, microprocessor-based
signal processing
 Extended temperature-and-humidity
operating range
 Automatic environment compensation
 Superior electromagnetic interference (EMI)
and radio-frequency interference (RFI)
immunity
 Restriction of Hazardous Substances
(RoHS compliant)
 UL Listed | FM & CSFM Approved
- UL 268: `Open Area Smoke Detection
’
- UL 268A (Duct) - `In-duct housing
’ use
- UL 268A (Duct) - `Direct
-in-Duct’ use
- ULC-S529: ‘System Smoke Detection
’
- ULC-S530: ‘Heat Actuated Fire Detection’
- FM 3230
- CSFM | File: 7272-0067:0258
Product Overview
The Photoelectric Smoke Detector (Model
FDO421) uses state-of-the-art
microcontroller circuitry and surface
-
mount technology for maximum
reliability. Model
FDO421 incorporates an optical sensor using a light-
scattering detection principle. The device utilizes advanced software
algorithms to analyze the signals, and provides highly stable and accurate
smoke detection.
Model
FDO421 also uses state-of-the-
art microprocessor circuitry with error
check; detector self
-diagnostics, and supervision programs.
Each detector
is UL 268 7th edition listed incorporating advanced built-in
ISO
technology™ - True Class-
X SLC operation (use is optional) greatly
improving system reliability and circuit integrity while providing advanced
addressable fault finding.
The unit
fits into one (1) wall-or-ceiling footprint, and only occupies one (1)
address on the signal
-line circuit (SLC).
Model FDO421 is a plug
-in, two-wire,
addressable photoelectric smoke
detector
whose value is increased with built-in ISOtechnology feature. Model
FDO421 is Underwriters’ Laboratories Listed [UL268A Listed for direct in
-air
duct usage].
Each detector consists of a dust
-
resistant photoelectric chamber and
microprocessor
-based electronics with a low-
profile plastic housing. Every
Model FDO421 fire det
ector is shipped with a protective dust cover.
Operation
Model FDO421 is a wide
-
spectrum, photoelectric smoke detector that
incorporates an
infrared light-emitting diode (IRLED), as well as a light-
sensing photodiode. Under normal conditions, light
transmitted by the LED
is directed away from the photodiode and scattered through the smoke
chamber in a controlled pattern.
The smoke chamber is designed to manage
light dissipation and extraneous reflections
from dust particles or other non
-smoke,
airbor
ne contaminants in such a way as to
maintain stable, consistent detector
operation. When smoke enters the detector
chamber, light emitted from the
IRLED is
scattered by the smoke particles and is
received by the photodiode (
see: images on
page 2).