PSR-11-39-MD Oxygen Sensor (R-22D)

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SKU
ADI-PSR-11-39-MD-x

The PSR-11-39-MD Oxygen Sensor is the most commonly used oxygen sensor in the scuba industry, popular in both rebreathers and analyzers.

NOTE: We offer bulk pricing discounts for either 3-Pack, 4-Pack or 5-Pack purchases.

Factory fresh, our oxygen sensors are never more than four months old when we ship to you.

PSR-11-39-MD Oxygen Sensor (R-22D)

PSR-11-39-MD Oxygen Sensor
PSR-11-39-MD Oxygen Sensor 3-Pin Molex Connector Sample Pressure Test Data Front View Hydrophobic Membrane Sensor Dimensions
  • Oxygen sensor with 3-pin Molex connection
  • Accuracy within +/- 2% of full scale
  • Response time is 6 seconds
  • Dated test results included with each sensor
  • Commonly used in the scuba industry

The Analytical Industries (AI) PSR-11-39-MD, with a 3-pin Molex connector, is compatible with the Teledyne R-22D sensor and Maxtec MAX-305F sensor.

The PSR-11-39-MD is by far the most popular oxygen sensor, used in the O2ptima, Prism2, Hollis Explorer 2, KISS Classic/GEM and upgraded KISS Sport, Pathfinder, Hammerhead, Divesoft, Poseidon, rEvo, and many other brands of rebreathers.

Features

  • 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.

Usage Note: The usual mV range for R-22D type cells is from 8 mV to 14 mV in air, i.e. 21% oxygen at 1 Atmosphere Absolute, with 10 mV being typical for a sensor that has been in service. At 14.0 mV the theoretical value in 100% 0xygen and 1.0 ATA would be 66.92 mV. Some rebreather electronics will refuse to calibrate at the upper end of the range (i.e. high 60's) because oxygen sensors very rarely put out that much current by the time they reach the hands of the consumer and are put in to service. However, our sensors are fresh enough that it can happen, particularly if they were just removed from the sealed package and the temperature or barometric pressure that day is high. If so, allowing the sensor to acclimate in air or Nitrox overnight will usually resolve the high reading calibration issue. It's also true that rebreathers will refuse to calibrate at the lower end of the range. If so, check the connection by moving the sensor to another position in the sensor array and if the low reading calibration issue persists then replace the sensor.

  • 10.0 mV = theoretical mV at PO2= 1.0 ATA is 47.80
  • 11.0 mV = theoretical mV at PO2= 1.0 ATA is 52.58
  • 12.0 mV = theoretical mV at PO2= 1.0 ATA is 57.36
  • 13.0 mV = theoretical mV at PO2= 1.0 ATA is 62.14
  • 14.0 mV = theoretical mV at PO2= 1.0 ATA is 66.92
More Information
SKU ADI-PSR-11-39-MD-x
Brand Analytical Industries
Weight (lbs) 1.0000
Customer Reviews
Most Helpful Customer Reviews
  1. PSR-11-39-MD Oxygen Sensor (R-22D)

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    Five Stars
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  2. No problems

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    Thank you
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  3. PSR-11-39-MD Oxygen Sensor

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    In stock, fast shipping, quality packaging. No hassle.
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  4. Second time order

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    This is my second time ordering these O2 sensors, they work great in my Kiss rebreather. Also, Dive Gear Express has the best service in the industry. I am a long time customer and am consistently satisfied with my orders from these guys.
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  5. Holy Crap....here already!

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    To Oz,super fast delivery,right part,great price.
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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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