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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 FS19X/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 180 to 3000
nanometers (0.18 to 3.0 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 FS19X/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
Configuring the Detector
Honeywell
Installation Guide and Operating Manual // Model FS19X™ & FS20X™ Series
II
™, and ModBus. If the microprocessors determine, based on internal
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003
002
001
000
(continued)
1
2
3
4
OFF
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
5
6
7
8
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
®
based
9
10
ON
ON
ON
OFF
OFF
ON
OFF
OFF
ON
ON
ON
OFF
OFF
ON
OFF
OFF
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