Fixed Gas Monitoring Instruments > Flame Detection > Honeywell FSL100 Series


Honeywell FSL100 Series UV, UV/IR, and IR3 Flame Detector

The Honeywell FSL100 series flame detectors have the ability to detect a variety of fires including fires from hydrocarbon and non-hydrocarbon sources. They have a durable design that is suitable for tough indoor and outdoor environments and even potentially explosive atmospheres.

The FSL100 series come in three models: Ultraviolet (UV), Ultraviolet/Infrared (UV/IR), and Triple Infrared (IR3).They are approved to EN54-10 and FM3260 flame detector standards.

Key Specifications

  • Range: UV & UV/IR: 80ft (24m); IR3: 100ft (30m)
  • 4-20 mA output and relay
  • Red or White GRP enclosure
  • FM Class 1, 2, and 3, Div 2
  • Detects both hydrocarbon and non-hydrocarbon fires

Specifications, Manuals, and Supporting Literature

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Model Selection Guide

Use this table to find the right model for your application.  Don't see the option you need? Call a Lesman sales specialist at 800-953-7626

Description Red Enclosure
Catalog Number
White Enclosure
Catalog Number
FSL100 Series Flame Detector, FM 3611 Class 1, 2 & 3 Div2; FM3260 approval
UV flame detector FSL100-UV FSL100-UV-W
UV/IR flame detector FSL100-UVIR FSL100-UVIR-W
IR3 flame detector FSL100-IR3 FSL100-IR3-W
FSL Swivel Mount FSL100-SM21
Non EX FSL100 test lamp,
with universal charger and carrying case
Intrinsically safe (Pending*)
FSL100 test lamp, with carrying case
12 Vdc battery for FSL-TL test lamp FSL100-TLBT
H3 light bulb for FSL-TL test lamp FSL100-TLBU
Universal charger kit for FSL-TL test lamp FSL100-TLCH

NOTE: FSL100 flame detectors should be installed with Swivel Mount (FSL-100-SM21) for proper positioning and optimized field-of-view.
Purchase test lamp (FSL100-TL) to conduct performance checks every 6 months.


Use this table to compare the FSL100 Series flame detectors

For indoor applications;
Good for materials burning with
low temperatures (i.e. Sulfur)
Analyzed Flame Flicker-
Frequency for improved false
alarm rejection
Reads through window
contamination and smoky fires
For fires from light and
heavy hydrocarbons, and
Hydrocarbon and
non-hydrocarbon fire
Ideal for liquid
hydrocarbon and dirty
fires and fires that emit
large amounts of smoke
Resistance against direct
and reflected sunlight,
and artificial light (ex.
fluorescent tubes)
Resistance against direct and reflected sunlight, artificial
light, arcs and electric discharges, and radiation from electric
welding that takes place at a distance of 10 feet or more
from the flame detector


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