Section 3: Operation; Principle Of Operation; Configuring The Detector - Honeywell FS20X Series Installation Manual And Operating Manual

SECTION 3: OPERATION

3.1

Principle of Operation

Honeywell Analytics' Multi-Spectrum, Multi-Spectral and MultiBand™ Infrared and Ultraviolet Fire and Flame
Detectors are sophisticated, state of the art, electro-optical digital radiant energy Detectors that sense the
wideband radiant energy emitted by fire's combustion processes that include flames' molecular emissions and
hot particulate blackbody emissions. Radiant Energy Fire Detectors respond much faster to flames and fires at
a longer distance than other types of conventional photoelectric and ionization smoke and heat detectors
because a fire's emitted radiant energy travels at the speed of light. High speed of response is critical for
detecting flaming fires in time to successfully activate suppression or activate other fire responses such as
closing fire doors. Seconds can make the difference between suppressing a small fire with little or no damage
or having a disastrous fire that overwhelms a suppression system thereby failing to stop the fire.
Infrared (IR) consists of spectral wavelengths longer than the color red and Ultraviolet (UV) consists of
wavelengths shorter than the color violet. For the FS20X Detector, the UV and IR range for fire detection, which
a large portion of the spectrum is invisible to the human eye, is from approximately 185 to 260 nanometers and
0.4 to 3.5 microns. Honeywell Analytics' Detectors sense and measure the radiant energy generated by a fire
at the speed of light.
Honeywell Analytics' FSX Fire Detectors also use an additional spectral region, the Visible Band, that spans
from about 400 to 700 nanometers (0.4 to 0.7 microns.) The Visible Band is used to further discriminate against
non-fire false alarm sources. The Model FS20X Detector senses radiant energy coming from hydrocarbon and
non-hydrocarbon fires. Built-in microprocessors use sophisticated Digital Signal Processing (DSP) to accurately
distinguish radiant energy from a real fire and a false alarm source(s). Honeywell Analytics has developed and
refined these complex proprietary and patented WideBand IR and UV algorithms for over a quarter of a century
since 1981. These patented algorithms perform real-time DSP, and precisely analyze the signals in high-
resolution frequency and time domains. This decision making process involves thousands of real-time
calculations every second. Honeywell Analytics FSX Detectors use solid-state high speed quantum sensors
(not heat sensors such as pyroelectric or thermopile) that all respond to the fire's radiant energy emissions. The
quantum sensors convert the rate of photonic energy directly into analog electrical signals. These analog
signals are converted to high resolution digital values for real-time microprocessor analysis.
The Detector microprocessors incorporate random access memory (RAM), read-only memory (ROM), and non-
volatile flash memory. When the microprocessors determine that a real fire has been detected, the pre-alarm
digital sensor data (FirePic™) and the event information are recorded in flash memory. Depending on the
configuration, other actions may include activating one or more status LEDs, relays, a current loop and sending
digital data such as the RS-485 FireBus
testing and "through-the-lens" testing, that the Detector is not operating correctly, it records the Fault data in
flash memory and activates the Fault outputs and the yellow status LED. The digital data in the Detector can be
easily accessed with a PC for later analysis and record keeping using Honeywell Analytics' Windows
PC software and FSIM-1A USB Interface Unit.
3.2

Configuring the Detector

IMPORTANT: Changing the Detector Settings – To activate changes to the settings using SW1, SW2 and
SW3, reset the Detector by removing and re-applying 24 VDC input power.
The Digital Address for the RS485 Communication can be set using positions 4 through 10 on SW1. Switch
positions 1, 2 & 3 for SW1 are for factory use only and should not be changed.
Figure 3-1 (SW1)
Ten (10) Position DIP Switch
Honeywell
Installation Guide and Operating Manual // Model FS20X™ Series
™, and ModBus. If the microprocessors determine, based on internal
II
1 2
OFF OFF
127
OFF OFF
126
OFF OFF
125
OFF OFF
124
OFF OFF
003
OFF OFF
002
OFF OFF
001
OFF OFF
000
3 4 5 6
OFF ON ON ON
OFF ON ON ON
OFF ON ON ON
OFF ON ON ON
OFF OFF OFF OFF
OFF OFF OFF OFF
OFF OFF OFF OFF
OFF OFF OFF OFF
®
based
7 8 9 10
ON ON ON ON
ON ON ON OFF
ON ON OFF ON
ON ON OFF OFF
OFF OFF ON ON
OFF OFF ON OFF
OFF OFF OFF ON
OFF OFF OFF OFF
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