PSR-11-39-REVO Oxygen Sensor

On Order
The PSR-11-39-REVO Oxygen Sensor is used in the Mares rEvo and Horizon rebreathers. Note this is a 3rd party sensor that is NOT approved by the rEvo factory for use in their rebreathers.

The global pandemic has caused diving grade oxygen sensors to be in limited supply because manufacturers have dedicated much of their production to medical versions. For more information please read our TekTip titled Oxygen Sensor Availability During Global Pandemic.

Factory fresh, our oxygen sensors are never more than four months old when we ship to you. Due to the unique nature of the product, this diving grade oxygen sensor is NON-RETURNABLE. Your complete satisfaction is our goal, so please consider carefully before purchase.

PSR-11-39-REVO Oxygen Sensor

PSR-11-39-REVO Oxygen Sensor
PSR-11-39-REVO Oxygen Sensor 3-Pin Molex Connector Front View Hydrophobic Membrane

The PSR-11-39-REVO provides compatibility for all Mares rEvo and Horizon models. The Analytical Industries (AI) PSR-11-39-REVO is a special output range version. The mV specification is 9.5 mV to 13 mV as compared to the 8 mV to 14 mV of the industry standard PSR-11-39-MD sensor. Note that this is a 3rd party sensor manufactured by Analytical that is NOT approved by rEvo factory for use in their rebreathers.


  • Accuracy within +/- 2% of full scale
  • Response time is 6 seconds
  • Conformal coating
  • Temperature compensated
  • Hydrophobic membrane

AI brand diving sensors ship with the documentation of a final pressure test for each sensor. The sensor is tested at approximately one ATA in air and 100% oxygen, then tested again at 1.8 ATA in oxygen, and the millivolt readings are recorded for all measurements. The results document that the cell is within specifications for current and linearity up to a PO2 exceeding 1.6 ATA. The dated test results are included in the package with each individual sensor.

More Information
Brand Analytical Industries
Weight 0.250000
Tek Tip Warning Image WARNING

Dive Gear Express has not done any verification or validation of rebreather oxygen sensors and disclaims any responsibility and liability for the use of oxygen sensors in rebreather applications. Verification and validation of specific oxygen sensors for use in rebreather applications is the responsibility of the equipment user and/or original equipment manufacturer.

Oxygen sensors are one of the very few items on our website that are NOT returnable, because we can't know with absolute certainty how they were handled once delivered. Additional shipping and handling of the return can also degrade performance. They are critical to safety in rebreather diving, and our customers have a reasonable expectation of receiving as factory fresh a product as possible from Dive Gear Express. Your complete satisfaction is our goal, so please consider carefully before purchase.

Mixing Brands or Ages of Oxygen Sensors

Many electronically controlled rebreathers use an array of several sensors to alert the diver to the possibility of a failing sensor. The rebreather electronics will generate a warning indication when the sensors do not agree with each other. This is an important safety feature enabled by the multi-sensor array and the diver must respond immediately to sensor warnings.

If the sensor array contains a mix of brands or ages of sensors you may experience unexpected behavior of the sensor array that could result in misleading warnings. For example, installing a single new sensor in an array with much older sensors may cause sensor warnings simply because the new sensor responds faster than the older sensors. There are numerous other circumstances in which a mixture of brands or ages in an oxygen sensor array can cause otherwise acceptable sensors to generate a warning, solely due to ordinary differences between the sensors. You might see transient sensor warnings while the different sensors catch up to each other and auto calibrating rebreathers might even fail to calibrate in such situations.

Rebreather manufacturers each have specific recommendations regarding sensor replacement strategies for their rebreathers and we advise following their recommendations in order to avoid misleading warnings. If you are considering switching brands of sensors, it's tempting to want to just 'try one out' rather than replace the whole array, but we do not recommend mixing brands or ages of sensors.

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