Compliance Controls AFR-64R: Rich-Burn Air Fuel Ratio Controller

Rich Burn Air-Fuel Ratio Control System for Natural Gas Engines

compliance.AFR64RThe AFR-64R controller precisely tracks the air-fuel mix to maintain targeted emissions levels, regardless of variance in load, ambient air temperature or fuel composition. It stores up to 64 load-specific air-fuel set points and automatically tracks engine load changes based on engine rpm and manifold air pressure.

The AFR-64R air-fuel ratio controller monitors ambient changes, reacts with precision, and diagnoses potential problems before they become costly. If your looking for a lot of control combined with cost savings, this controller pinpoints performance problems as soon as they occur. Misfires and detonations are identified to cut the costs of maintenance, downtime, labor and replacement parts.

Whether you need better emissions compliance, engine prognosis/diagnosis and trouble-free equipment life, the AFR-64R air/fuel ratio controller helps maximize the efficiency of the engine and its three-way catalytic converter.


• Multi-set point (64), load tracking, air/fuel ratio controller
• Pre and Post-catalyst engine exhaust monitoring
• Critical engine and catalyst function diagnostics
• Continuous health monitoring of the oxygen sensors
• Tracking includes engine load, tailpipe emissions, ambient air temperature, fuel composition and more
• Fast, easy, low-cost installation
• Fits virtually any gas-fueled, carbureted, rich-burn industrial engine, with (or without) a catalytic converter
• Windows®-based platform compatible: software can be installed on laptop, PC, or network
• Comprehensive 38-fault diagnostics, including continuous oxygen sensor health monitoring
• Data plotting for easy, accurate troubleshooting
• Separate alarm and shut-down dry contact relays
• Pre-catalyst closed loop, exhaust oxygen feedback control
• Post-catalyst exhaust oxygen feedback; cascade control for fast, real-time adaptation to changing catalyst performance
• Variable set-point for pre-catalyst and post-catalyst exhaust oxygen control for real-time response to varying engine loads
• Catalyst temperature monitoring for catalyst over temperature protection
• Drives up to two control banks for operation on ā€œVā€ type engine configurations
• Multiple valve control options:
      - Full Authority Valve controls all engine fuel via system-controlled butterfly valve
      - Trim Fuel Valve adds supplemental fuel to the air intake via system-controlled proportional fuel valve
• RS-485/Modbus communications support for high-speed data transmission


• Ongoing emissions compliance
• Reduces fuel consumption, leading to better fuel economy
• Reduced maintenance costs
• Elimination of operator guesswork
• Longer, more trouble-free equipment life
• Identifies problems early to prevent costly equipment damage and failures
• Minimal operator intervention and training


• AFR-64R Sales Bulletin (pdf)

© 2016  RJ Mann & Associates Inc.