Please read the following guidelines carefully before using this sensor.


  • The sensor is an electrochemical sensor, in effect it is like a battery, it will need replacing at approximately 5 years. The exact duration of the sensor will depend upon storage temperature and correct storage. The 5 year estimation is based upon storage at an ambient of 21 to 25 Celsius and the sensor being stored vertically when not in use and the amount of available oxygen.
  • Failure to store the sensor vertically will affect warranty conditions.
  • If necessary, clean the outer surface of the sensor housing using a damp cloth. Do not immerse the sensor in any cleaning media. Do not use alcohols.
  • Liquid will permanently damage the Oxygen in Air sensor. If the sensor is to be used in an environment where there is a risk of condensation e.g. with a plant in a sealed environment (e.g. a plastic bag), position the sensor so that any liquid that does condense will not come into contact with the sensing element.
  • Allow a few minutes for the sensor to settle into a new environment after set up so the readings can stabilise before starting to record data. This allows the gas being sampled time to percolate/diffuse into the sensor and for it to adjust to any change in air pressure or temperature.
  • The response time of this sensor will depend considerably on air circulation i.e. it will respond more quickly in a moving current of air.
  • The Oxygen in Air sensor has been designed for educational purposes only. It should not be used to indicate any environmental compliance regulations.
  • If the sensor does not read 20 - 21% oxygen at connection leave for a few moments to settle and if still not reading true use the calibration button in the devices drop down to set the value. You can use known oxygen concentration atmospheres or use the accepted value of 20.95% for the atmosphere.
  • The sensor does use temperature compensation for slow changes, if the temperature changes rapidly the compensation will not respond – it will need to catch up.
  • The Humidity, Temperature and pressure sensors are accurate and will allow the user to collect that data alongside oxygen levels, This makes it very useful for environmental work or simple physiology work (for example measuring changes in air in, air out – use humidity, temperature and oxygen to show changes) thus reducing the need to have multiple sensors. If you use an alternative temperature sensor turn off the oxygen sensor temperature channel.
  • The sensor is designed to fit into the supplied Nalgene bottle, the black end cap is not a constant diameter to accommodate variations in the bottle opening.