MAN0987_Iss 2_09/16
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FSL100 Series Flame Detectors
Technical Handbook
OVERVIEW
3 Overview
The Honeywell Analytics FSL100 series of Flame Detectors comprises three models:
FSL100-IR3 Triple Infrared flame detector
FSL100-UV Ultraviolet flame detector
FSL100-UVIR Ultraviolet and Infrared flame detector
These flame detectors monitor an area by looking for the presence of invisible infrared or ultraviolet light that occur outside the
frequency range occupied by visible flames, and they can do this in the presence of interference (sunlight, smoke, dust, vapour
etc.) to determine whether or not a fire is actually present within their field of view.
All three detectors utilize a microprocessor for sophisticated electronic signal analysis. Detectors with IR sensors also analyse
the flame flicker effect. The Triple IR flame detector uses this method to give highly reliable nuisance alarm rejection and is also
less affected by optical contamination and smoke than are UV based flame detectors.
The diagram below shows the spread of invisible UV/IR radiation that is available for sampling outside the human visual range,
and shows how a UV/IR detector can be potentially 1 million times more sensitive than a human eye.
Frequency (Hz)
Wavelength
Figure 1.
Comparison of Visible Radiation Range to UV/IR Radiation Range
Note:
Monitoring a fire zone (i.e. a fume chamber) through its glass or acrylic walls could reduce or defeat the sensitivity of
certain types of flame detector.
For example, plain glass and acrylic are known to block IR but may transmit UV, whereas coated materials may block both.
Please consult Honeywell Analytics Technical Support for further information if you need this type of application
UV
Visible
Near IR
IR
Thermal IR
Far IR
