HTS IFM – P522 Signal Processor Series

Overview

The Honeywell Model P522 is a fail-safe, self-checking dual-channel UV and IR signal processor designed for use with two switched S55XBE series viewing heads. It provides independent gain adjustments for each sensor channel and multiple IR flicker set points, making it well-suited for industrial flame monitoring applications where a high level of flame discrimination is required.

The P522 features an integrated 4-digit digital flame signal display, LED status indicators, and an analog bar graph for continuous system visibility. Configuration and monitoring can be performed locally at the device or remotely via FlameTools software over Modbus RS-422 communication. Available in AC and DC input voltage versions to accommodate a range of installation requirements.

Features & Benefits

• Dual-channel UV and IR flame signal processing with independent gain adjustments per sensor — enables high discrimination in applications with multiple burners or adjacent flame sources
• Supports two switched S55XBE series viewing heads simultaneously — reduces panel space and wiring requirements
• Available in AC (P522AC: 100–240 VAC) or DC (P522DC: 22–26 VDC) input voltage versions — flexible for varied installation environments
• 4-digit digital flame signal display, 4 LED status indicators, and analog bar graph — provides continuous at-a-glance system status
• Panel-mounted design with plug-in terminal connectors — simplifies installation and field wiring
• Adjustable flame on/off threshold — allows tuning to specific application conditions
• Local and remote programming, configuration, and monitoring via FlameTools software — reduces commissioning and troubleshooting time
• Two configurable files for remote selection — supports switching between burner configurations without rewiring
• Scalable 0–20 mA or 4–20 mA analog output — integrates with standard process instrumentation and DCS/PLC inputs
• Modbus RS-422 communication supports up to 64 loops — enables centralized monitoring of large multi-burner installations
• Safe Failure Fraction (SFF) >99% — rated SIL 3 for use in high-integrity safety instrumented systems

Technical Specifications

• Power Input — P522AC: 100–240 VAC, 50/60 Hz, 300 mA + 100 mA per viewing head; P522DC: 22–26 VDC (+5%/–20%), 300 mA + 100 mA per viewing head
• Battery Backup Voltage — 22 to 26 VDC, 300 mA; +100 mA per additional viewing head
• Viewing Head Power — +26 VDC max, fused 0.25 A; +14.3 VDC pulsing (0.2 s ON, 0.8 s OFF)
• Viewing Head Compatibility — S55XBE series
• UV Gain Range — 0 to 99
• IR Gain Range — 0 to 699 (default: 450)
• IR Filter Settings — 8 options: 16, 24, 33, 52, 75, 100, 155, 215 Hz
• Flame Failure Response Time (FFRT) — 1, 2, or 3 seconds
• Flame Relay Output — 2 Form C Contacts (DPDT)
• Self-Check Relay Output — 1 Form C Contact (SPDT)
• Relay Rating — Max 60 W, 125 VAC; Max 220 VDC / 250 VAC; Max 2 A
• Analog Flame Signal Output — User-selectable 0 to 20 mA or 4 to 20 mA (360 Ohm max load)
• Flame Signal Input — 7.5–30 VDC, 3,900 Ohm input resistance
• Channel Select Input — 7.5–30 VDC, 3,900 Ohm input resistance
• Serial Communication — RS-422, 4800 or 9600 baud, 4-wire / 2 twisted pair
• Modbus Registers — 23 Holding Registers (4X) and 5 Discrete Registers (0X): flame count, gain, UV/IR settings, temperature, relay status, firmware revision
• System Architecture — 1oo1 (one out of one)
• Safe Failure Fraction (SFF) — >99%
• Proof Test Interval — 1 to 5 years
• Ambient Temperature Range — 0 to +50°C (32 to +122°F)
• Mounting Dimensions — 7.2 in H x 4.25 in W x 6.4 in D (approximately)
• Approvals — FM Approved, CSA Certified, SIL 3, WEEE Directive 2012/19/EU

Applications

• Industrial burner flame monitoring requiring dual-channel UV and IR detection
• Applications requiring high flame discrimination between adjacent burners or flame sources
• Multi-burner installations utilizing Modbus RS-422 networked signal processors (up to 64 loops)
• Safety instrumented systems (SIS) requiring SIL 3-rated flame detection components
• Installations requiring remote configuration and monitoring via FlameTools software
• Systems requiring scalable analog output integration with DCS, PLC, or SCADA platforms

Models / Configurations

• P522AC – AC input model; 100–240 VAC, 50/60 Hz; dual-channel UV and IR signal processor for two switched S55XBE series viewing heads
• P522DC – DC input model; 22–26 VDC; dual-channel UV and IR signal processor for two switched S55XBE series viewing heads

P522 Accessories

• S55XBE Series Viewing Heads – Compatible UV and IR viewing heads for use with the P522 signal processor (two switched heads supported simultaneously)

Documentation