UV/IR² Flame Detector

Product code: 55000-064APO

55000-064APO - UV/IR² Flame Detector
The combination of UV and IR2 detection, plus signal processing allows the sensor to be used without risk of false alarms in difficult situations chracterised by factors such as flickering blackbody by radiation or arc welding.
Full Details
Electrical Description

The UV/IR² Flame Detector signals an alarm state by switching an alarm latch on, increasing the current drawn from the supply from 8mA to 28mA and closing the contacts of a Fire relay RL1. These signals from the detector are recognised by the control panel as an alarm signal. The alarm current also illuminates the detector integral red LED. A Fault relay RL2 closes its volt free contacts if the detector has no faults and the supply voltage to the detector is the correct value. To ensure correct operation of the detector the control panel must be arranged to supply a maximum of 30 volts DC and a minimum of 14 volts DC in normal operation. To restore the detector to quiescent condition after indicating a fire, it is necessary to extinguish any flames in view and interrupt the electrical supply to the detector for a minimum of one second. Removing the detector front cover provides accesses the detector terminals and configuration DIL switch. The detector is normally configured to latch into an alarm state when a flame is in view. The configuration DIL switch within the detector can be set to place the detector into a non-latching mode. The detector can then also produce proportional analogue current alarm signals i.e. 8-28mA or 4-20mA. In non-latching mode the detector only produces an alarm signal when a flame is in view resetting itself to normal a few seconds after the flame has gone.


The UV/IR² Flame Detector is sensitive to low frequency, flickering infra-red and UV radiation emitted by flames during combustion. The UV/IR² Flame Detector is set to respond to low-frequency flickering infra-red (0.75 to 2.7μm) radiation at 1 to 15Hz along with UV (185nm to 260nm) in order to detect almost all flames, including those invisible to the naked eye, e.g. hydrogen fires. The UV/IR² Flame Detector has two IR sensors that respond to different IR wavelengths in order to discriminate between flames and spurious sources of radiation. False alarms from flickering sunlight, arc welding or lightning are avoided by this combination of UV and dual IR signal processing techniques.


Flame detectors are used when detection is required to be unaffected by convention currents, draughts or wind; tolerant of fumes, vapours, responsive to a flame more than 25m away and fast reacting. Typical applications examples are: -aircraft hangars -engine rooms -engine test facilities -fuel storage and handling -generators -high voltage equipment -nuclear industry -petro-chemicals -printing -storage tanks Applications and locations to avoid: -prolonged ambient temperatures above 55°C -sunlight falling directly onto IR2 optics -exposure to severe rain and ice -flicking or moving hot objects -flood or spot lighting falling directly on IR optics -large amounts of flickering reflections -obstructions to field of view

Maintenance & Service

The flame detector is designed to give years of trouble-free operation with minimal attention. However the periodic maintenance steps listed below are essential to maintain reliable fire protection. 1. Inform all appropriate personnel of intention to work on the flame detector. 2. Disable any automatic systems that may be activated by the flame detector if not required as part of the maintenance check. 3. Check that the flame detector’s control panel is functioning correctly and shows no faults. 4. Inspect the detector viewing window for any build-up of dust or other contaminants on the optical surface. If necessary clean the optical surface with a cotton wipe wet with commercial liquid glass cleaner. Rinse with clean water and dry with a clean cloth. The detector specification for performance is with a clean optical sensor window. Contaminants like dust, oil and paint will reduce sensitivity. 5. Ensure the detector still has a clear line of sight of the area it is protecting and no obstacles obstruct its view. 6. Check that the detector is securely fitted. 7. Visually check the exterior of the detector for any mechanical or corrosive damage. 8. Test the operation of the detector with either a portable flame sensor test unit or if practical a flickering yellow flame. 9. Reinstate any automatic system disabled during maintenance. 10. Inform all appropriate personnel on completion of the maintenance work and if necessary record this work.

Additional Information

ACCESSORIES A range of accessories and test equipment is available for the UV/IR2 Flame Detector: Weathershield, part no 29600-206, (see Fig. 5)Flame Sensor Test Unit and case, part no 29600-226.Stainless steel 2 axis adjustable mounting bracket, part no 29600-203+ * For a full list of applications for Apollo Flame Detectors, please refer to PP2409, available on request.

Product Information

The combination of UV and IR2 detection, plus signal processing allows the sensor to be used without risk of false alarms in difficult situations chracterised by factors such as flickering blackbody by radiation or arc welding.

Key Features

Selectable output options: Conventional two-wire, 4-20mA, Latching or Non-latching, Relay Contacts - Fire/Fault, Pre alarm Class 1 sensitivity to EN 54-10 detects 0.1m2 fire at 25m High optical interference immunity Selectable response speed Optical self test Low power consumption IP65 rated Supply voltage 14 to 30Vdc Operating temperature -10°C to +55°C

Warranty10 year
Range of view (at 25m)0.1m² n-heptane
Range of view (at 35m)0.2m² n-heptane
Range of view (at 45m)0.4m² n-heptane
Field of view90°
Spectral response (min) - UV185μm
Spectral response (max) - UV260μm
Spectral response - UV185 to 260μm
Spectral response (min) - IR0.9μm
Spectral response (max) - IR1.7μm
Spectral response - IR0.9 to 1.7μm
Maximum power-up time2 seconds
Humidity (min)0% RH
Humidity (max)95% RH
Humidity Noteno condensation or icing
Humidity0% to 95% (no condensation or icing)
Operating temperature (min)-10°C
Operating temperature (max)85°C
Operating temperature-10 to 85°C
Storage temperature (min)-20°C
Storage temperature (max)65°C
Storage temperature-20 to 65°C
  • CPR
  • LPCB
Materials housingDie-cast zinc alloy
Product length142mm
Product width108mm
Product depth82mm
Number of cable gland entries2
Cable gland entries size20mm
How to Order

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