AST-22D O2 Sensor
AST-22D O2 Sensor

Product imagery shown for reference. Confirm the exact configuration before ordering.

O2 Sensors for Scuba Diving

AST-22D diving oxygen sensor - Replaces Teledyne R-22D, R-22S, PSR-11-917-MD

AST-22D diving oxygen sensor replaces Teledyne Class R-22D and R-22S diving oxygen sensors. AST-22D also replaces AII Model PSR-11-39-MD, PSR-11-39-rEvo,  City Technology CT-1 and CT-12 diving oxygen sensors. This sensor fits in several rebreathers including KISS, Interspace Megalodon, Oxy Spy, Oxy2, Optima, Hollis Prism and Poseidon Rebreathers. The…

Product references
Request a quote Download datasheet Talk to a specialist
Application supportFit and process guidance from an AST specialist. AST engineeringOxygen measurement expertise from Southern California.

Technical information

Product details

Technical overview

AST-22D diving oxygen sensor replaces Teledyne Class R-22D and R-22S diving oxygen sensors. AST-22D also replaces AII Model PSR-11-39-MD, PSR-11-39-rEvo,  City Technology CT-1 and CT-12 diving oxygen sensors. This sensor fits in several rebreathers including KISS, Interspace Megalodon, Oxy Spy, Oxy2, Optima, Hollis Prism and Poseidon Rebreathers. The sensor provides the signal mV output via a 3-PIN Molex connector. Typical response time to a step change in oxygen concentration is under 9 seconds. Supper activated anode material along with proprietary electrolyte formulation ensures full utilization of Pb anode. The sensor design utilizing a unique geometry of Pb anode in combination with proprietary electrolyte offer a 36 months of operating sensor life. Sensor is designed, developed and manufactured in the USA

Applications and guidance

Advanced Sensor Technology

AST-22D Diving Oxygen Sensor

The AST-22D Diving Oxygen Sensor from Applied Sensing Technologies serves as a direct replacement for the Teledyne Class R-22D and R-22S oxygen sensors. In addition, it replaces the PSR-11-39-MD, PSR-11-39-rEvo, City Technology CT-1, and City Technology CT-12 diving oxygen sensors.

This sensor is used in a wide range of closed-circuit rebreather systems, including KISS, Interspace Megalodon, Oxy Spy, Oxy2, Optima, Hollis Prism, and Poseidon rebreathers. Therefore, divers can install the AST-22D sensor easily as a form-fit replacement in compatible diving equipment.

The sensor uses a super-activated anode material combined with a proprietary electrolyte formulation. As a result, the design ensures full utilization of the lead (Pb) anode. Consequently, the sensor delivers longer operating life with minimal signal drift, which helps reduce the need for frequent calibration.

Because of its stable performance and reliable output, the sensor is an excellent choice for accurate oxygen measurement in diving and life-support applications.

The AST-22D diving oxygen sensor is designed, developed, and manufactured in the United States by Applied Sensing Technologies.

Model AST-22D Diving O2 Sensor Replaces

  • Teledyne R-22D and R-22S
  • Analytical Industries Inc. PSR-11-39-MD and PSR-11-39-rEvo
  • City CT-1 and Max Tech MAX-12
Download Datasheet (pdf)
Specifications and compatibility references
Product family
O2 Sensors for Scuba Diving
References
% O2 sensor, MAX-12, PSR-11-39-MD, PSR-11-39-rEvo, R-22S

Explore alternatives

View product family

Application support

Not sure this is the right sensor?

Send the existing sensor or analyzer model and AST will help confirm the correct replacement.

Talk to engineering