Can my O2 Sensor be repaired?

The Vernier O2 Gas Sensor contains an electrochemical cell that has an average lifespan of about six years when stored properly (upright). When new, the O2 Gas Sensor has an output voltage of approximately 3.2 V at ambient levels of O2 gas (20.9%). This output voltage decreases over time but will still give good readings when calibrated. Once the output voltage for ambient O2 gas levels has dropped below 1.8 V (or reads <12% O2), or the signal is not steady, the sensor is considered "dead."

If you suspect your sensor that is still under warranty (5 years) is dead, contact Vernier for technical support. If it is indeed dead, we will offer a free replacement or refurbishment. If your dead sensor is out of warranty, you will need to purchase a new sensor.

Note: The new-style O2 Gas Sensors (manufactured after April 2007) can be refurbished with a new electrochemical cell, whereas the old-style sensors cannot. (New-style O2 Gas Sensors can be identified by the recessed calibration button on the side, whereas old-style sensors have a calibration button on top.) Once these new-style sensors begin to go out of warranty, a lower-cost refurbishing option will be available.