Cleaver-Brooks | Products & Solutions | Controls | Stand Alone Controls | CB Accu-Trim

CB Accu-Trim

Stand Alone O2 Trim Control

  • Steam or hot water applications
  • Saves fuel
  • Oxygen trim control
  • Stand-alone

The CB Accu-Trim is a stand alone, O2 trim control package ideal for those systems without other high-end control requirements.

The CB Accu-Trim O2 Trim System is a stand alone, PLC-based control system designed to maintain the proper fuel-to-air ratio of a boiler/burner. The system will automatically compensate for changes in temperature, barometric pressure, or fuel characteristics, as well as correcting for normal hystereses. The system is intended for use with single-point positioning, or jackshaft-type, combustion controls; however, it may be customized for special applications such as parallel positioning or alternate fuel firing. A complete system includes oxygen and firing rate sensors, a control panel, which houses the PLC, and an actuator or VSD system, which trims either the fuel or air flow.

Design options include the custom CB O2 Probe and industrial O2 probes such as Yokogawa. A variable-speed drive is used to provide fuel or air trim. The CB Accu-Trim works with standard or compact fuel trains such as the Siemens valve assembly. Setup and operation are easy with the user-friendly HMI.


  • Stand alone trim control
  • Air or fuel trim
  • Variable-speed drive option
  • Works with standard or Siemens gas trains
  • User-friendly setup


  • Lower Fuel Cost


  • Process Steam
  • Industrial Process
  • Building Heat
  • Sterilization
  • Humidification
  • Waste Heat Recovery
  • Hospital and Healthcare
  • Power and Utilities
  • Refineries and Petrochemical
  • Laundry and Dry Cleaning

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