General Monitors FL500 UV/IR Flame Detector

Code: FL500-3-5-1-2-1-1-1-1
  • High-speed flame detection
  • Monitors radiation emitted by flames in UV and IR spectra
  • Stainless Steel housing suitable for harsh environments

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The Ultraviolet/Infrared FL500 Flame Detector delivers high-speed flame detection with increased immunity to false alarms in a compact design.

The FL500 UV/IR Flame Detector is designed to detect radiation emitted by a flame in the ultraviolet (UV) and infrared (IR) spectral ranges. UV and IR technology combination ensures a fast response time and increased immunity against false alarms caused by other radiation sources, making it a reliable protection tool.

UV/IR Technology

A UV/IR flame detector combines an ultraviolet (UV) sensor for quick response and an infrared (IR) sensor that monitors radiation emitted by a flame. This combination offers increased immunity, operates faster, and is suited for indoor and outdoor use.

Improved Design

Stainless steel housing, three LED status indicators, reduced footprint, and simplified wiring make the FL500 easy to install and maintain.

FM Performance Approved Detection

The FL500 UV/IR Flame Detector has seven performance fuel sources approved by Factory Mutual (FM)—heptane, hydrogen, methane, methanol, propane, propane, ethane, and butane.

Safety Integrity Self-Check

Every two minutes, a built-in self-check known as Continuous Optical Path Monitoring (COPM) performs an optical and electrical check to ensure the optical path is clear and the electronic circuitry is operational.

Reliable Testing Anytime, Anywhere

The FL500 can be tested with our exclusive TL105 Test Lamp, which simulates the flickering of a fire. This allows the detector to be tested under simulated fire conditions without the associated risk of an open flame.

Order Information

FL500-5-5-1-2-1-1-2-1 FL500 Flame detector (standard ATEX configuration)

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Title Size
FL500 Datasheet 83 KB
FL500 Manual 487 KB
FL500 UVIR Configurator 88 KB

Additional information

Weight 0.190 kg


Wave Lengths 185 to 260 nm (UV)
4.35 microns (IR)
Field of View Up to 130° max. conical
Fuel Distance (ft.) Response Time (s)
n-Heptane 90 6.0
n-Heptane 60 < 3.0
Methanol 40 12.0
Methane 80 < 10.0
Propane 60 < 7.0
Butane 55 < 6.0
Ethane 60 < 3.0
Accessories Test lamp
Classification Class I, Div 1, Groups A*, B, C, D;
Class II, Div 1, Groups E, F, G;
Class III, Type 6P
Ex db IIC T5 Gb;
Ex tb IIIC T100°C Db
II 2 G D
Warranty Three Years
Approvals CSA, FM, ATEX, IECEx, CE Marking
Compliance to CPR through EN 54-10
HART 7 registered
SIL 3 suitable
Operating Temperature Range -67°F to +185°F
(-55°C to +85°C)
Storage Temperature Range -40°F to +185°F
(-40°C to +85°C)
Operating Humidity Range 0% to 95% RH, non-condensing
Housing 316 Stainless Steel, powder coated
Diameter 4.5” (114 mm)
Length 5.5” (140 mm)
Weight 9 lb. (4.0 kg)
Mounting Stainless steel mounting bracket
Cable Entry 2 x 3/4” NPT or 2 x 25 mm
Standard Configuration FL500-5-5-1-2-1-1-1-1
1.25 mA HART, source current, relays,
Modbus, high sensitivity, 4 sec. delay,
3/4” NPT, mounting bracket
Input Power 20-36 VDC
200 mA max. current
(3 W max. power consumption
Typical Current 80 to 150 mA
Analog Output Source or Sink
Analog Signal 0-20 m
Fault Mode 0-0.2 mA**
COPM Self-Check Fault 2 mA, ± 0.2 mA***
Ready Signal 4 mA, ± 0.2 mA
IR Signal 8 mA, ± 0.2 mA
UV Signal 12 mA, ± 0.2 mA
Alarm Low 16 mA, ± 0.2 mA
Alarm High 20 mA, ± 0.2 mA
Relay Contact Rating 5 A 250 VAC,
5 A @ 30 VDC resistive (North America),
5 A @ 30 V RMS/42.4 V peak,
5 A @30 VDC resistive (Europe)
RS-485 Output Modbus RTU, suitable for linking up to 128 units or up to 247 units with repeaters.
BAUD Rate 2400, 4800, 9600, or 19200 BPS
HART Fully HART 7 FieldComm compliant
EMC Complies with EN 50130-4, EN 61000-6-4
Cable Requirements Screened or screened and armored to BS5308 Part 2, Type 2, or equivalent.
Status Indicator 3 LEDs with status, fault and alarm conditions
Faults Monitored Memory checksum, reset line shorted, optics blockage, internal voltages and low supply voltage

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