Specialty Oxygen Sensors for Analyzers

Most Options - In Stock
Analytical Industries (AI) offers a wide selection of replacement oxygen sensors for diving gas analyzers.

† Although we make every effort to keep all these sensors in stock, because of relatively low unit sales volumes for some of the more obscure models, they can occasionally have a significant lead time in order for Dive Gear Express to be able to offer the freshest sensor available.

Specialty Oxygen Sensors for Analyzers

Specialty Oxygen Sensors for Analyzers
Specialty Oxygen Sensors for Analyzers
  • See chart below to find the sensor you need
  • Choose from a wide selection of sensors for diving gas analyzers
  • In stock sensors are "factory fresh" for longest performance

For rebreather replacement sensors please visit Rebreather Sensors.

Please double check the part number you have selected above matches the replacement sensor for your model dive gas analyzer in the compatibility list. If you do not find your diving gas analyzer listed below, then we do not have a compatible replacement sensor.

Compatibility List by Part Number

  • The PSR-11-37-D2 will work in the OMS Pro Dive O2 Analyzer II (Yellow Rectangle † see note below) analyzers.
  • The PSR-11-37-D2-1 will work in the Teledyne MixChek, Nuvair O2 QuickStick, and Nuvair Pro Trimix (Before 04/2013). Replaces OEM sensors Teledyne R-33D1-NUV and Nuvair #9510.
  • The PSR-11-37-D3 will work in the Analox Mini O2 & O2-II & O2 Portable, OMS Pro Dive O2 Analyzer (White Rectangle † see note below), ScubaPro (Analox) - **NOT for the Analox O2EII. Replaces OEM sensors Maxtec MAX-308.
  • The PSR-11-37-D4 will work in the OxyCheq Expedition, MSA MiniOx IV, Abysmal/TDL TekCheck, and RC Dive Spectrum Pro-1 analyzers. Replaces OEM sensors Oxycheq O-13.
  • The PSR-11-37-52D will work in the Analox O2EII analyzer. Replaces OEM sensor Analox 9100-9220-9B.
  • The PSR-11-39-ATA will work in the Analox ATA Trimix analyzer. Replaces OEM sensors Analox 9100-9212-94.
  • The PSR-11-39-JD, with the 3.5mm Mini-Jack connector, is used in Dive Rite VTI, Mini-Ox brand, Spectrum brand, Vandagraph VN202, OxyCheq El Cheapo/Expedition-X, and Teledyne AD300/MD300 analyzers. This sensor is often referred to generically as the R-17D (an old Teledyne part number no longer manufactured) and also plug compatible with the R-17S. Replaces OEM sensors MaxTec Max-301.
  • The PSR-11-39-JD1 will work in the Maxtec MaxO2 and OM-25AE analyzer. Replaces OEM sensor Maxtec MAX-250E.
  • The PSR-11-39-MD5 with the 3-pin Molex connector, is used in the OMS Pro Dive O2 Analyzer (Yellow Peanut † see note below). Replaces OEM sensor MaxTec MAX-312 and Teledyne R-22DDHO
  • The PSR-11-39-MD with the 3-pin Molex connector is a diving grade version of the PSR-11-39MNB. This sensor includes a hydrophobic membrane and is often referred to generically as the R-22D (an old Teledyne part number no longer manufactured) and also plug compatible with the R-22S type sensors. Although slower in response time, many divers prefer using this sensor in analyzers for it's resistance to moisture. Replaces OEM sensor MaxTec Max-305 (and later 305F version), NRC D-05, and Oxycheq RD22.
  • The PSR-11-39-MNB with the 3-pin Molex connector and offering a faster response time than R-22D type sensors, the sensor is used in the Cochran Lifeguard, Apeks DSX analyzer accessory, DiveTek O2, DiveNav cootwo, Mares EANx, and OxySpy analyzers. Replaces OEM sensors Teledyne R-22S.

The AII-11-75-PO2D for the Analytical Industries Palm 'D' oxygen analyzer, the AII-OSV-22-AF for the Analytical Industries Palm 'CO' carbon monoxide analyzer, the AII-11-60-D for the AII-3000-A Oxygen Analyzer, and the AII-11-75D oxygen sensor for the Trumix 4001 Trimix analyzer are listed as separate products.

The Divesoft 22S for the Divesoft branded gas analyzers is also listed as a separate product.

Compatibility List by Diving Gas Analyzer

Abysmal/TDL TekCheck PSR-11-37-D4
Analox ATA Trimix PSR-11-39-ATA
Analox Mini O2 & O2-II & O2 Portable PSR-11-37-D3
Analox O2EII PSR-11-37-52D
Apeks DSX analyzer accessory PSR-11-39-MNB or PSR-11-39-MD
Cochran Lifeguard PSR-11-39-MNB or PSR-11-39-MD
Dive Rite VTI PSR-11-39-JD
DiveNav cootwo PSR-11-39-MNB or PSR-11-39-MD
DiveTek Oz PSR-11-39-MNB or PSR-11-39-MD
Mares EANx PSR-11-39-MNB or PSR-11-39-MD
Maxtec OM25AE PSR-11-39-JD1
Mini-Ox brand PSR-11-39-JD
MSA MiniOx IV PSR-11-37-D4
Nuvair O2 QuickStick PSR-11-37-D2-1
Nuvair Pro Trimix (Before 04/2013) PSR-11-37-D2-1
OMS Pro Dive O2 Analyzer II
(Yellow Rectangle † see note below)
OMS Pro Dive O2 Analyzer
(White Rectangle † see note below)
OMS Pro Dive O2 Analyzer
(Yellow Peanut † see note below)
OxyCheq El Cheapo/Expedition-X PSR-11-39-JD
OxyCheq Expedition PSR-11-37-D4
OxySpy PSR-11-39-MNB or PSR-11-39-MD
RC Dive Spectrum Pro-1 PSR-11-37-D4
ScubaPro (Analox) PSR-11-37-D3
Spectrum brand PSR-11-39-JD
Teledyne AD300/MD300 PSR-11-39-JD
Teledyne MixChek PSR-11-37-D2-1
Vandagraph VN202 PSR-11-39-JD

† The original OMS company (prior to 2015) sold several different products under the same "Professional Dive O2 Analyzer" name and using the same documentation bundled with different accessories, however while they have the same name they all use different specific oxygen sensors. You can distinguish the analyzers by their color and shape, either white rectangle or yellow rectangle or yellow peanut. The yellow rectangle shape requires a PSR-11-37-D2 sensor, the white rectangle shape requires a PSR-11-37-D3 sensor, the yellow peanut shape requires a PSR-11-39-MD5 sensor.

More Information
Brand Analytical Industries
SKU PSR-11-xx
Weight 0.250000

Customer Reviews

Tek Tip Warning Image WARNING

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 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.

The R-22 and R-17 type oxygen sensors in diving

Teledyne Analytical, a early pioneer in the development of galvanic oxygen sensors, manufactures a variety of sensors for different applications. The R-22 models are all characterized by the same physical dimensions and 3-pin Molex connector; the R-17 models are similar but with an 3.5 mm mini-jack connector. They output approximately 10 mV in ordinary air at one atmosphere (i.e. 0.21 ATA partial pressure of oxygen) and room temperature with an average lifespan of about 36 months. In elevated oxygen pressures the mV output is much higher and the lifespan is much shorter. The various models differ internally in order to support specific applications such as automotive (R-22A/R-17A), medical (R-22MED/R-17MED), and gas analyzers (R-22S/R-17S). Early versions of modern rebreather designs incorporating oxygen sensors used those models (because it was what was available), but the sensors are sensitive to the high levels of humidity found in rebreather loops. Teledyne later offered "D" versions for the diving market (R-22D/R-17D) that improved their resistance to moisture.

In the 2000's, Teledyne Analytical had to defend the sensors in several (frivolous?) lawsuits associated with rebreather fatalities. Although the sensors were never found to be at fault, Teledyne ceased manufacture of the diving grade models because the litigation costs to defend the sensors exceeded the value of the very small rebreather sensor market at the time. Several other competing manufacturers began to offer plug-compatible replacements for the now discontinued R-22D/R-17D models. Over time those other manufacturers have made significant improvements to the original design, although the physical and connector specifications have remained the same. They are often still generically referred to as "22D type compatible" or "17D type compatible" after the original Teledyne model number, although Teledyne has not resumed branded production of diving grade sensors.

The primary difference between the "S" type sensor and the "D" type sensor is the presence of a hydrophobic membrane on the face of the diving grade sensor. The membrane improves resistance to moisture, but slows the response of the sensor to changes in oxygen partial pressures by several seconds. In practice, for use in diving gas analyzer applications the slightly slower response time of diving grade sensors is little consequence with the benefit being the design is more resistant to moisture found on the face of tank valves. If the diver or fill station operator fails to wipe or blow away any moisture present on the valve outlet, that moisture can enter the stream of gas being analyzed and affect the accuracy of the analysis. Some prefer to use the D type sensors even in analyzers because of their resistance to moisture, others prefer the S type sensors for their slightly faster response time in analyzers - especially in frequent use applications. Both types will work in gas analyzers but the S type must never be used in rebreathers.