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Item # FL4000H, Multi-Spectrum Infrared Flame Detector

The Model FL4000H is an advanced multi-spectrum flame detector designed to provide superior false alarm immunity with the widest field of view. The FL4000H employs a state-of-the-art multi-spectrum infrared (MSIR) sensor array with a sophisticated Neural Network Technology (NNT) system. The FL4000H is designed to detect typical fires such as those produced by alcohol, n-heptane, gasoline, jet fuels and hydrocarbons. In addition, the FL4000H can see through dense smoke produced by diesel, rubber, plastics, lube oil, and crude oil fires.

The NNT flame discrimination algorithm classifies the output signals from the MSIR sensor array as either fire or non-fire. The MSIR/NNT combination is highly immune to false alarms caused by lightning, arcwelding, hot objects, and other sources of radiation.

The FL4000H's electronics are housed in a stainless steel explosion-proof enclosure. The detector is available with the following output configurations:
  • 4-20 mA stepped output
  • Dual serial communications
  • HART communication
  • Warning, alarm and fault relays
The serial communication port(s) allows 128 units (247 using repeaters) to be linked up to a host computer using the Modbus RTU protocol. The communication registers provide alarm status, fault and other information for operating, troubleshooting or programming the unit.

The COPM (Continuous Optical Path Monitoring) self test checks the optical path integrity (window cleanliness) and the detector's electronic circuitry every two minutes.

  • Drilling and Production Platforms
  • Gas Turbines
  • LNG/LPG Processing and Storage Facilities
  • Fuel Loading Facilities
  • Compressor Stations
  • Electrostatic Paint Spray Booths
  • Aircraft Hangars
  • Refineries
  • Chemical Plants

  • Specifications  · Features / Benefits  · Environmental Specifications  · Mechanical Specifications  · Electrical Specifications  · Manufacturer


    Spectral Range

    2 - 5 microns (IR)

    Maximum Range1

    230 ft
    70 m

    Typical Response Time

    < 10 s

    Minimum Arc Welding Immunity Distance

    5-15 ft, (1.5-4.6 m) depending on rod

    Maximum Field of View2

    100º @ 100 ft; 90º @ 210 ft


    Test lamp, mounting bracket


    Class I, Div. 1, Groups B, C, D;
    Class II, Div. 1, Groups E, F, G;
    Class III
    Ex tb IIIC T100ºC Db
    II 2GD Ex d IIC T5 Gb


    Two Years


    CSA, FM, ULC, ATEX, IECEx & CE Marking, HART registered, SIL 3 suitable, FM certified to IEC 61508.
    1 1 sq. ft. n-heptane fire using high sensitivity. This is a nominal value and different results may arise depending on the source of each fire.
    2 Maximum field of view is the angle at which FL4000H can detect flame at 50% of maximum specified range.

    Features / Benefits
    • Multi-Spectrum IR (MSIR) Sensor Array
    • Neural Network Technology (NNT)
    • Continuous Optical Path Monitoring (COPM)
    • Multiple Communication Outputs
    • Event Logging
    • Test Mode
    • Increased range and wide field of view
    • Provides superior false alarm immunity
    • Checks optical path integrity and detector's electronic circuitry
    • Versatile for use in a variety of applications
    • Standalone diagnostic tool
    • Used to check all outputs (used with test lamp)

    Environmental Specifications

    Operating/Storage Temperature Range

    -40 to +176 ºF
    -40 to +80 ºC

    Operating Humidity Range

    0% to 95% RH, non-condensing

    Mechanical Specifications


    316 stainless steel


    4.3 in
    1.9 mm


    3.5 inches (89 mm) optical housing
    5.4 inches (137 mm) base


    3.6 kg
    7.9 lb


    Stainless steel mounting bracket

    Cable Entry

    2 x 3/4 inch NPT

    Electrical Specifications

    Input Power

    20-36 VDC
    24 VDC @ 150 mA (3.6 W)

    Analog Signal

    0-20 mA (600 Ohms maximum)
    3.5-20 mA (HART)

    Fault Mode

    0 to 0.2 mA

    Test Mode

    1.5 mA, ± 0.2 mA

    COPM Fault

    2 mA, ± 0.2 mA

    Ready Mode

    4.3 mA, ± 0.2 mA

    WARN Mode

    16 mA, ± 0.2 mA

    ALARM Mode

    20 mA, ± 0.2 mA

    Relay Contact Rating

    8A @ 250 VAC, 8A @ 30 VDC resistive maximum

    RFI/EMI Protection

    Complies with EN6100-6-4: 2001 and EN50130-4: 1995+A2: 2003

    Selectable Options

    Sensitivity: High, Medium or Low Alarm Time Delay: up to 14 seconds with dip switches and up to 30 seconds with Modbus
    Warn & Alarm Relays: Latching/Non-Latching Energized/De-Energized

    RS 485 Output

    Modbus RTU, suitable for linking up to 128 units and 247 units with repeaters

    Baud Rate

    2400, 4800, 9600, 19200, or 38400 bit/s


    HART 6, HART Device Description Language available. AMS Aware

    Status Indicators

    Two LEDs with status and fault cues

    Fault Monitoring

    RAM, EPROM and EEPROM checksum errors, optics failure/blockage and low supply voltage

    Cable Requirements

    3 wire shielded cable minimum configuration. Maximum distance between FL4000H and power source or remote sensor @ 24 VDC nominal (20 Ohm loop): 14 AWG - 4,500 ft (1,370 m) Max. distance for analog output (250 Ohms max): 14 AWG - 9,000 ft. (2,750 m)

    Standard Configuration

    Dual Modbus, no relays, 0 - 20 mA, high sensitivity, 10 second delay, mounting bracket



    General Monitors


    ·  Graphical Drawing for Multi-Spectrum Infrared Flame Detector

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