Flue gas humidity meter

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Flue gas humidity meter

Flue gas humidity meter - DELTA O2

Differential wet-dry O2 measurement system
All-in-one system: one single flange mounted on the stack. It measures wet O2, dry O2 and H2O (en option) concentrations.Mesure de l'humidité des gaz de combustion par DELTA-O2

This system is composed of :

  • ZFK8 zirconia sensors
  • ZKM converters
  • FE Guide Tubes (in-situ version)
  • Fuji PLC (option)
  • Also available as extractive version (sampling probe + sampling line + compact remote cabinet)



Perfect for combustion control of biomass boilers : industrial boilers, district heating


  • Adaptability
    • Only one flange on only on side of the stack
    • Perfect for very dusty applications : Optional pack purge of guide tube, specially designed dust and tar filter
  • Competition
    • Lower cost than laser solutions



Measuring principleZirconium oxide
  • Wet O2 :  0 .. 25%
  • Dry O2 : 0 .. 25%
  • H2O (option): 0 .. 100%
Flue gas temperatureMaximum : +300°C
Ambient temperature
  • Range (indoor): +5 .. +40°C
  • Range (outdoor options): -20 .. +50°C
Output signals (standard)

Analog :

  • 4-20 mA for wet O2
  • 4-20 mA for dry O2
Power supply110 VAC, 230VAC

Fuji Electric Touch Screen interface
H2O concentration calculation
H2O 4-20 mA additional analog output
Alarm outputs
Modbus communication
Automatic calibration
Automatic backflush
Cabinet heater
Cabinet cooler


Flue gas humidity meter documentation