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Model P522 signal processors are fail-safe, self-checking signal processors that are used with two switched S55XBE series viewing heads. They offer independent gain adjustments for each sensor and multiple flicker set points for IR which makes them ideal for applications where a high level of discrimination is required. 





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  • Models available in AC (P522AC) or DC (P522DC) input voltage.
  • 4-digit digital flame signal display, 4 LED status indicators and analog bar graph provide continuous system status. 
  • Panel mounted design and plug-in terminal connectors allow for easy installation.
  • Adjustable Flame on/off threshold.
  • Programming, configuration and monitoring available at the device or remotely using FlameTools.
  • Supports two switched viewing heads.
  • Two configurable files for remote selection.    
  • Scalable mA output.                  
  • Modbus RS422 communication for use with FLAMETOOLS-PC or FLAMETOOLS-HMI/U supports 64 loops.  
  • Primary input power for AC models is 85 to 264 VAC, 47 or 63 Hz with 24 VDC backup power.
  • Primary input power for DC models is 22 to 26 VDC with 24 VDC backup power.
  • Ambient temperature: 32°F to 122°F ( 0°C to 50°C).
  • Flame relay: 2 form C contacts.
  • Self-checking relay: 1 form C contact.
  • Relay contact ratings: 5A at 30 VDC, 125 VAC and 277 VAC.
  • Analog flame signal: Scaleable 0-20 mA or 4-20 mA output for remote meters.
  • Digital set points for flame on and flame off.
  • 4 wire communication.
  • Adjustable FFRT 1, 2 or 3 seconds.    
Fit for use in SIL3 application

All fuels
Single and multiple burner boilers
Sulfur Recovery Unit
Power/utility boilers
Black liquor recovery boilers
Grate fired boilers
Cement, Lime and material drying kilns
Duct burners
Hydrogen burners         
Mixed fuel burners       



Part Number



AC signal processor.


DC signal processor.

Approximate Dimensions: 6.7" Height (170 mm) x 4.3" Width (109 mm) x 6.4" Depth (162 mm)