R. Canister Head and O2 sensors

MX Rebreather - Canister Head and O2 sensors

The MX series rebreather canister needs to be able to be accessed to remove the CO2 cartridge, so one end needs to have a removable cap or “head.” This head is a simple cap that is double O-ring sealed and easy to attach and detach as well as transport, dry and clean. It also has a separate sealed area that contains the three O2 sensors. This sealed area can also be opened, dried and cleaned, keeping the moisture away from the O2 sensors. The head also has cable through ports  allowing the PPO2 meter cables to penetrate through the head and connect to the O2 sensors. It also has the breathing loop attachment points to connect the breathing loop to the canister and CO2 Cartridge.  The breathing loop ports are situated in such a way to allow the exhaled gas to come in from the left side, flowing down into the canister, through the radial CO2 cartridge, and up through the center into the sealed sensor area on the head and out the right side of the head to the diver.

The O2 sensors are sensitive to moisture and therefore are designed to be in a sealed area on top of the canister, after the gas has passed through the radial cartridge. This is considered to be the driest area, with the O2 sensors facing downward, allowing the least amount of moisture to accumulate or contact the face of the O2 sensors. This is also the last place the gas passes that we can analyze it, making sure we are getting the most accurate PPO2 reading before the diver get’s it.