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Flame Sensors

Flame Sensors

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Flame Sensors

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  1. Flame Sensors www.Talentum.co.uk

  2. Introduction • Low Power 24Vdc Operation, 4-20mA or Relay Interface • Detects Open Flames & Glowing Embers • Sensitive to Flickering IR or UV/IR Emitted by Flames

  3. Why use a Flame Sensor If detection is required to be: Heat & smoke detection are the most economical method • Unaffected by convection currents, draughts or wind • IR sensors are tolerant of fumes, vapour, steam, dust and mist • Detection at over 25m away • Fast reaction

  4. Aircraft hangars Automotive industry – spray booths, – parts manufacture Coal handling plant Pharmaceuticals - fume cupboards Paper manufacture Power plants Textiles - dust collection - fillings Waste handling Woodworking Applications

  5. Ambient temperatures above 55°C Where the detector may view - Applications to Avoid • Flickering or moving hot objects (>200 °C) • Sunlight falling directly onto IR optics • Flood or spot lights directly on optics • Large amounts of flickering reflections • Exposure to severe weather • Close proximity to RF sources

  6. Theory of Operation • Detector Optics Detector Optics Signal Processing Input/Output Interface A B

  7. Optical Spectra

  8. Other Types 4.3µm Detector Optics Talentum IR Detectors B A B A 4.3 Excluding Atmospheric Absorption

  9. Types of Sensors Available Typical Sensor Cost Detection Methods Talentum Flame Sensors Highest Triple IR £1,000 UV/IR Dual IR (IR²) Immunity to False Sources 4.3 µm Single IR £100 UV Low UV Visible Near IR Mid IR 0.4µm 0.75µm 3.0µm Optical Spectrum

  10. Flame Sensor Selection

  11. Theory of Operation • Detector Optics • Signal Processing Detector Optics Signal Processing Input/Output Interface A B

  12. Signal Processing Flame Flicker Frequency Spectra

  13. Typical Flame Flicker

  14. + Energetic Flame Flicker

  15. A B Theory of Operation • Detector Optics • Signal Processing • Input/Output Interface Detector Optics Signal Processing Input/Output Interface

  16. Closes if flames detected Normally closed (N/C) when powered 1 2 3 4 5 6 7 8 Input/Output Connections +IN -IN R+ R- FLAME (N/O)Relay RL1 FAULT (N/C)Relay RL2 +24Vdc Supply Input Remote Test Input

  17. DIL Switch SENSITIVITY 0 Low Class 3 1 High Class 1 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 Selecting Options (Series 16000)

  18. Output Signalling (Series 16000) Quiescent/Alarm Current Selectable Options 3 / 9mA Min. + Flame Relay (RL1) 4 / 20mA No Relays 8 / 20mA or 8 /28mA + Flame & Fault Relays (RL1 & RL2) • Latching or Non-latching Current (mA) Flame Sensor (Series 16000) 1 + 24Vdc Supply Voltage 2 -

  19. Output Interface Option Typical Response on seeing Flame

  20. Output Interface Option Typical Response after last Flame is seen.

  21. Output Interface Option Typical Response to a Burst of Flame

  22. Output Interface Option Typical Response on seeing Flame - Break supply to reset

  23. Sensor Performance • Class 1 performance as defined in EN54:Part 10 Flame detectors – point detectors • Yellow flickering flame of approximately 0.1m² or • clear flame of 0.25m² at • 25m

  24. Sensor Performance • 0.1m² flicking yellow flame at 25m • 0.4m² flicking yellow flame at 40m 0.1m² 0.4m²

  25. Selection of Fires Tested Solids Liquids Gases • Aviation Fuels • Ethanol • Methylated Spirits • n-Heptane • Paraffin • Petrol • Butane • Fluorine • Hydrogen • Natural Gas • Off Gas • Propane • Coal • Cotton • Grain & Feeds • Paper • Refuse • Wood • Or just Dust from the above

  26. DIL Switch SENSITIVITY 0 Low Class 3 1 High Class 1 1 2 3 4 5 6 7 8 Sensitivity Setting • Class 1 is the normal setting (High) • Class 3 reduced sensitivity (Low) DIL Switch (Front cover removed)

  27. Sensor Field of View 90° Cone

  28. Sensor Field of View

  29. Calculation of Detection Distance ² ² ² = L + W + H Height Width Length ² ² ² example 22.9m = 20 + 10 + 5

  30. Installation Accessories Stainless Steel Adjustable Mounting Bracket Talentum Part No: 007127 Typical Arrangement

  31. Installation Accessories Stainless Steel Weather Shield Talentum Part No: 012545 Typical Arrangement

  32. Testing & Commissioning a. Self test by applying 24Vdc to Terminals 3 & 4 - Activates IR Test Source within Detector & Flashing Yellow LED - b. The best way to test a flame detector is with a real flame. Talentum Part No: 010018 c. Simulated Flame Testing. Talentum Part No: 016091

  33. Thank You