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  • Self calibrating
  • Sealed internal reference sensor_no reference gas required
  • IR through-the-glass keypad for Zone 1/Division 1 areas
  • Probe lengths of 19, 39 or 60 inches (0.5, 1 or 1.5 m)
  • One-step, one-gas, calibration verification
  • Drop-down menu user program
  • RS485 or RS232 communications port
  • Isolated current loop or voltage output
  • Fail-safe fault alarm
  • Onboard system diagnostics


Why Monitor Flue Gas?

Ideally, every burner should mix a precise ratio of air and fuel, and the fuel should burn stoichiometrically to yield only heat, water vapor and carbon dioxide. In reality, this rarely happens. Burners age, mixing is imperfect, colorific value of fuel varies, firing rates change, and the weather changes from day to day. Any of these factors can change the amount of air required for safe and efficient combustion of fuel. Accurate flue gas analysis minimizes fuel costs and reduces pollution in all combustion processes.

Self Calibrating with No Reference Gas

Accurate and reliable oxygen measurement has always been dependent upon tedious sensor calibration and costly reference gases until now.

The OxyTrak 411 uses a patented miniaturized zirconia sensor with a sealed internal-reference chamber to accurately determine flue gas oxygen content and rapidly respond to process changes (see illustration above). This new sensor's unique design is self calibrating. The internal electrical calibration of the sensor is performed automatically without the need for calibration gases.

The system works by pumping oxygen out of sealed reference chamber to establish a baseline and then measuring the electrical charge as oxygen ions re-equalibrate back into the chamber equal to oxygen partial pressure in the flue gas. The electrical charge measured is directly proportional to oxygen concentration.

In addition, the sensor's sealed internal-reference chamber eliminates the need for a reference gas. If manual calibration verification is desired, a gas port is provided for a simple, one-gas, one-step procedure, using air or other gases and remote or local user interfaces.


An in situ oxygen analyzer for:

  • Utility boilers; natural gas or oil fired
  • Process heaters; natural gas or oil fired