Combustion > Flame Sensors/Scanners/Relays > Flame Scanners > Signal Processors > Honeywell P222 Watchdog Signal Processor


Honeywell P222 Watchdog Signal Processor for Flare Stack Pilot Monitoring

The Honeywell Watchdog signal processor system monitors pilot and flare stack activity using an ultraviolet sensor. It provides continuous burner surveillance indicating the presence or absence of a flame at the flame tip. The RP222A signal processor includes two independent relays, one for early response (adjustable from 1-60 seconds) to a flame loss, and the other for time-delayed response (adjustable between the early response time and 60 minutes) for a flame-out alarm. The signal processor can be AC or DC powered, and is designed for use with the Honeywell IRIS CS256 ultravoilet viewing head.

Key Specifications

  • Signal processor for UV flare stack monitoring, with mounting base, plug-in terminals, four-digit alphanumeric display, keypad, and status LEDs
  • One channel input specifically for flare stack pilot monitoring
  • Outputs: 0/4-20 mA scalable, two SPDT early indication, one SPDT delayed indication, power to detector
  • Compatible viewing head: One S256 ultraviolet flare stack viewing head with digital display

Specifications, Manuals, and Supporting Literature

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Model Selection Guide

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Description Catalog Number
Flare Stack Signal Processor, AC P222AC


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