Intelligent Base Mounted UV IR² Flame Detector
The Intelligent Base Mounted UV IR² Flame Detector is designed to protect open indoor areas such as aircraft houses, generator rooms and paint works where open flaming fires may be expected. The detector has a UV and dual IR sensors responding to different wavelengths in order to discriminate between flames and spurious sources of radiation.
The detectors are loop powered and need no external supply. A remote LED alarm indication may be connected to the flame detector.
The detector is sensitive to ultraviolet and low-frequency, flickering infra-red radiation emitted by flames during combustion. Since it requires both UV and IR radiation the detector can operate in applications where a basic single UV or single IR detector would be inappropriate.
The detector is set to respond to ultraviolet (185−260nm) and low-frequency flickering infra-red (0.75−2.7μm) radiation at 1−15Hz in order to detect all flickering flames, including those invisible to the naked eye, e.g. those emitted by hydrogen fires.
The detector has one UV and two IR sensors responding to different wavelengths in order to discriminate between flames and spurious sources of radiation. False alarms due to electrical discharges from lightning or arc welding and flickering sunlight are minimised by combining the UV/IR signals.
UV/IR² Flame Detectors are used when detection is required to be unaffected by convection currents, draughts or wind; tolerant of fumes, vapours, steam, dust and mist, responsive to a flame more than 25m away and fast reacting.
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.
A portable Flame Detector Test unit is available, part number 2960 0 -226. Adjustable mounting bracket, part number 29600-458 (comes complete with Deckhead Mounting Box).Deckhead Mounting Box, part number 45681-217.
The field of view of the flame detector is shown in Datasheet PP2343. This also provides information on the size of fire detectable at various distances.