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Air/Fuel Ratio Control Systems



Murphy’s complete line of Air/Fuel Ratio Control Systems offers state-of-the-art engine control in one simple, easy-to-use product. Each system maximizes emissions-control and/or operational efficiency by maintaining the proper air-fuel ratio over varying engine loads, speeds, fuel quality, ambient temperatures and barometric pressures.

The controllers offer easy installation tailored to your specific requirements, and by using the same PowerView® 450 display on all AFR systems, minimal operator training is required.

Simplicity that you won’t find anywhere else. Quality that you can trust.




compliance controls AFR-9R air fuel ratio controller

AFR-9R Multiple Air-Fuel Control System

The AFR-9R controller offers nine setpoint targets, based on a combination of three RPM settings and three manifold pressure settings. As your engine's load conditions change, your AFR-9R continues to make sure it is in the best possible operating range. If your site is facing tightening regulations, changes in ambient temperature, big load swings or gas quality/pressure changes, the AFR-9R is the right solution. Simple air-fuel ratio control with more flexibility.






compliance controls AFR-64R air fuel ratio controller

AFR-64R Rich-Burn Air-Fuel Ratio Control System

If your business banks on revenues from rich-burn, spark-ignited natural gas-fueled engines equipped with catalytic converters, you face tough challenges every day. The AFR-64R controls rich-burn, natural gas-fueled engines, and maximizes the efficiency of a three-way catalyst by maintaining the proper air-fuel ratio over varying engine loads, speeds, fuel quality, ambient temperatures and barometric pressures.






compliance controls AFR-64L air fuel ratio controller

AFR-64L Lean-Burn Air-Fuel Ratio Control System

Businesses that run lean-burn, spark-ignited natural gas industrial engines face many challenges. The AFR-64L Lean-Burn Air-Fuel Control System was engineered to minimize engine emissions, maximize fuel efficiency, and cut engine maintenance costs – by maintaining the proper air-fuel ratio over varying engine loads, speeds, fuel quality, ambient temperatures and barometric pressures.






compliance controls AFR-FI air fuel ratio controller

AFR-FI Air-Fuel Ratio Control For Lean-Burn, Turbocharged, Fuel-Injected Engines

The AFR-FI is based on the Millennium Controller developed by FW Murphy – specifically configured for turbocharged, fuel-injected, lean-burn engine air-fuel ratio control. At the heart of the AFR-FI, the 100 MHz, 586-compatible microprocessor continuously monitors inputs and set points and regulates fuel-system air flow for precise maintenance of the optimum lean-burn air-fuel mix over a range of operating conditions.






engine integrated control system

EICS® - Engine Integrated Control System

EICS® combines key components - ignition system (powered by Murphy’s IntelliSpark™ Ignition technology), air/fuel control, speed governing, interface and diagnostics, sensors, harnesses, catalyst and engine control unit (ECU) - in one package, saving you money and man-hours associated with the installation and setup of separate engine components.






compliance controls accessories

MurCal stocks the full line of products from Compliance Controls. We are ready to answer your questions and help you find a solution for your specific application.

Click on the image to the left to enter the Compliance Controls section of our online web store. You will find information on all the available parts and have the opportunity to purchase the parts you need.