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Optical Oxygen Gas Sensor - FDO2

  • High accuracy
  • Low drift
  • Factory calibrated 
  • Long life, non-depleting
  • Fast response (t63 < 2s)
  • Digital output of oxygen partial pressure
  • Temperature compensated
  • Low power consumption
  • Lead free

The FDO2 is an optical oxygen sensor for gas measurements based on luminescence quenching of a sensor dye. The dye is excited with red light, and the properties of the resulting luminescence are measured in the near infrared. The presence of molecular oxygen quenches the luminescence, changing its intensity and lifetime fully reversibly. This principle is very robust. It shows virtually no interferences to other gases. It does not deplete over time, unlike galvanic oxygen sensors with their limited shelf life. Optics and electronics are hermetically sealed from the measured gas. The sensing surface is highly hydrophobic, so water droplets do not disturb the measurement. The sensor is factory calibrated. The FDO2 features build in temperature compensation and a digital interface that provides oxygen partial pressure values. No additional signal conditioning is necessary. A mounting thread and a robust locking connector allow easy installation.

For evaluation purposes we offer a simple logger software (Windows) available for download here.


  • Incubators
  • Oxygen concentrators
  • Inert gas processing chambers (glove boxes)
  • Exhaust gas measurement
  • Inert gas monitoring
  • Portable equipment
  • Monitoring fruit ripening and transport

Available Items

Item No. Description Pricing
in EU*
FDO2 Optical oxygen meter FDO2 for the gas phase, OEM module with UART interface on request
FDO2-FTC Flow-through-cell for FDO2 on request
FDO2-USB USB Interface Cable for FDO2 on request

* Only EU-Prices shown. Contact us for pricing outside EU. Not for resale.


Typical measuring range (ppO) 0-500 hPa ( 0-50%O2)
Max. measuring range (ppO) 0-2000 hPa
Accuracy @ 10°C – 40°C ±0.2 hPa at 10 hPa / ±5 hPa at 200 hPa
Resolution ±0.1 hPa at 10 hPa / ±1 hPa at 200 hPa
Detection limit 0.1 hPa (0.01%O2)
Response time (t63) < 2 sec.
Drift @ 25°C <1% O2 / year at 20% O2
Minimum lifetime >50,000,000 measurements
Emmission wavelength 760 nm (NIR)
Storage life >5 years in darkness at 20°C
Temperature range during operation -10 to 60°C
Temperature range during storage -40°C to 60°C
Maximum absolute pressure 20 bar
Maximum differential pressure 3 bar
Max rel. humidity Non condensing conditions on backside of housing
Supply Voltage 3.3 – 5.0 V DC
Standby Current ca. 8 mA
Communication Interface 3.0 V UART (5 V tolerant)
Connector Molex 560020-0420