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FAQ ABOUT REBREATHERS

Products - Rebreathers

FAQ ABOUT REBREATHERS

Open circuit divers considering transitioning to closed circuit diving need basic information about rebreather equipment and safety, course descriptions, costs and logistics. Without getting bogged down in too much detail, the best place to start may be to read our article Closed-Circuit Rebreather Instruction.

Yes, we have diving grade oxygen sensors used in rebreathers, plus we have replacement analyzer oxygen sensors for a variety of nitrox analyzers. We also have an article on Oxygen Sensor Handling Best Practices.

For logistics reasons, our Customer Care team is unable to answer questions regarding specific dates of manufacture or expiration on products with limited shelf life such as: rebreather oxygen sensors with 6 month shelf life, CO2 absorbents with 60 month (five year) expiration dates, and cylinders with 60 month (five year) hydro re-test dates. We guarantee you will receive products dated well within current supply-chain norms: rebreather absorbent and cylinders will be less than two years from date of manufacture, oxygen sensors will be less than six months from date of manufacture.

We turn over our inventory frequently and can assure you that the products we ship are fresh.

Oxygen sensors and absorbent are some 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. These consumables 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 CCR Cylinders and Valves in our Rebreather category have differences in their configuration than those in our Gas-Tanks category. The cylinders and valves themselves are physically the same in both categories; equally oxygen compatible and oxygen clean. However, the CCR cylinder selections are only appropriate for rebreather in-board mounting and include options to add Oxygen/Diluent contents decals. Cylinders configured for CCR will ship with the VIP decal unaffixed so it can be later applied to the cylinder wall in a location unobstructed by rebreather tank mounting systems. The CCR valve configuration options include our specialized versions typically only seen on rebreathers, along with options to select knob color and do not include a No Valve/No VIP option. Rebreathers only use DIN regulator fittings, so the included valve accessories for CCR are a threaded dust plug rather than a vinyl cap and do not include a DIN-to-Yoke insert adapter.

Yes, Sofnolime™ 8-12 Mesh NI (Grade 797) is a suitable granular option for your Dive Rite O2ptima, Poseidon VI or Se7en, and rEvo CCRs.

The Dive Rite models with the 2015 packable/EAC scrubber can accept either granular or Extendaire cartridge, earlier versions can only accept the Extendaire cartridge. The Poseidon models originally used a Molecular cartridge that is no longer available, and now require a self packable granular adapter. The rEvo only accepts granular for the self packable cassettes used in its dual scrubber system.

The primary difference today from the user standpoint is that the Poseidon Se7en+ electronics module has been updated to include native support for Poseidon's optional Solid State Oxygen Sensor. Due to improvements in gas injection the Se7en+ design now requires three instead of four solenoids, theoretically improving reliability by reducing parts count. There also are some internal differences that make the e-module easier to manufacture, assemble and service at the factory. Support for granular absorbent (in the form of a self-pack cartridge) is also now included as standard on the Se7en+ model, as the pre-pack cartridge has been discontinued.

The typical intermediate pressure setting for most first stages is around {135 psi | 9.5 bar}. Upon request a Dive Gear Express service technician will adjust the IP to your specified non-standard setting prior to shipment but only for diaphragm first stage designs. We also offer 3rd party modifications to the Apeks DS4 to change the behavior of the intermediate pressure; enabling use with constant mass flow orifices and needle valves found on some types of rebreathers.

The IP adjustment on diaphragm type first stages is simple enough for most divers to learn to do themselves. The IP adjustment screw is located under the environmental seal cap on the bottom of the regulator. The only tools needed are a round surface spanner wrench to remove the cap, a hex key set to turn the adjustment screw to change the IP setting, and an IP pressure gauge to measure the setting. These are all available in our Regulator Service Tools category. A few minutes with a knowledgeable peer or Google will show you how.

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