Hey guys,
This might be my first post here. I Scuba dive for a living. I live it, I love it and I like learning all about it. Recently, one of my oxygen analyzers bit the dust. It wasn't apparent until I bought the $80 Oxygen cell for it. Needless to say, it's not being made any longer. Consequently, I took it apart and finally reverse engineered it enough to fix it as well as to create another one for when this one fails again. Here is the story on that: http://2sb.us/473123
A couple of years ago, I became certified in Rebreather diving. This is where you scrub your breath of C02, add a bit of oxygen and breathe it over again. Some rebreathers use quite a bit of electronics, but in the end I want something that I fully understand to act as a back up. A fully redundant method of measuring the PPO2. I've seen a number of home brewed devices and a couple that are being sold for what seems a sizable profit. Here's a diagram of the circuit I sussed out earlier:
The meter is a Lascar SP200. I want something about half the size. I want to fit the circuit, including batteries, in a small tube. I don't know what diameter tube I'll need until I come up with the final circuit. The battery package needs to last 10+ hours of constant use. I'll need to calibrate this just once before I dive and then it will be sealed. It can be off by 3 or 4 percent, maybe even more. It's a backup to make sure I don't go below 0.2 PPO2 or above 1.4 PPO2.
This might be my first post here. I Scuba dive for a living. I live it, I love it and I like learning all about it. Recently, one of my oxygen analyzers bit the dust. It wasn't apparent until I bought the $80 Oxygen cell for it. Needless to say, it's not being made any longer. Consequently, I took it apart and finally reverse engineered it enough to fix it as well as to create another one for when this one fails again. Here is the story on that: http://2sb.us/473123
A couple of years ago, I became certified in Rebreather diving. This is where you scrub your breath of C02, add a bit of oxygen and breathe it over again. Some rebreathers use quite a bit of electronics, but in the end I want something that I fully understand to act as a back up. A fully redundant method of measuring the PPO2. I've seen a number of home brewed devices and a couple that are being sold for what seems a sizable profit. Here's a diagram of the circuit I sussed out earlier:
The meter is a Lascar SP200. I want something about half the size. I want to fit the circuit, including batteries, in a small tube. I don't know what diameter tube I'll need until I come up with the final circuit. The battery package needs to last 10+ hours of constant use. I'll need to calibrate this just once before I dive and then it will be sealed. It can be off by 3 or 4 percent, maybe even more. It's a backup to make sure I don't go below 0.2 PPO2 or above 1.4 PPO2.