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oxygen sensors

Travel by Boat of Car with Your CCR

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When using a car and boat, your dive destination may be a lot closer to home, but there are still a few special tips to consider.

  • Bring extra bungee cords for boat travel. Many boats are specifically constructed for single tank divers. The benches may be awkward for a rebreather diver. Bring your own method of securing the rebreather to the bench or the floor.
  • Consider the orientation of your rebreather scrubber. If your rebreather is lying on its back, vibrating on a moving boat or in a car for hours, will your particular canister design be subjected to drastic settling? Some canister designs are equipped with springs that help to resolve settling issues, but if the orientation of the rebreather in relation to the settling forces is incorrect, you could get some channeling of material.
  • Fully assemble and check your rebreather before leaving the dock. You don’t want to be packing sorb on a bouncing boat and also don’t want to capture diesel fumes within the breathing loop.
  • Beware of extreme heat. If you gear is sitting sealed in a hot car for a long period of time, you can damage the oxygen sensors.
  • Beware of extreme cold. If your packed rebreather sits in a freezing car overnight, the moisture in the sorb can freeze causing damage to the canister and dusting in the material itself.
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Kevin Gurr May Save Your Life

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White Paper on Oxygen Sensors May Save Your Life

O2 cells Tempstik 7735lThis article, painstakingly written by Kevin Gurr and aggressively peer reviewed by colleagues, may be the most important thing you will read about your rebreather. Your oxygen cells are the key to your life support and yet many people abuse them and use them beyond their working life. Kev’s article spells out everything you need to know about cells and why we are all so adamant about proactively changing them out. Read this and read it again. The information may save your life.

This is a very long article, but well worth your time. You can read it or download it here: Oxygen-Sensors-for-use-in-rebreathers-release-V1

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Rebreather Diving: Mixing Sensors

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Mixing Sensors is a Crap Shoot

SensorsP1010693lYour oxygen sensors are the heart of your CCR, offering critical information about your life support status. Attempting to save money by stretching your sensors beyond their service life may greatly increase your diving risks.

Teledyne stopped supplying sensors to the diving market quite a while ago. If your rebreather contains any Teledyne sensors, they are beyond their expiration, whether they have just been installed recently or not. While you are checking your sensors, ensure that you have not mixed different brands within your rebreather. Your three sensors should be of the same brand. Each manufacturer has a proprietary algorithm that compensates for temperature changes within the unit. If you mix brands you may find that they drift apart through the duration of your dive. This might not be attributed to depth, but rather temperature changes. Ensure the sensors within your rig are made by one manufacturer and are approved by the manufacturer of the unit.

It is critical that these sensors were tested by the CCR manufacturer. CE standards ensure these critical tests have been completed. If your rebreather is not CE EN:14143 approved, then contact the manufacturer for verification of their test protocols for sensors and the approved brands that are documented through their testing. If your sensors are in good order, risks are reduced and without reliable sensors, its all a crap shoot.

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