Quote:
| Originally Posted by Brian Garner
"Also, you may want to change the setpoint to a low value before ascent"
This is a new idea on me. The Po2 drops on ascent so setting it to a low value may push it too close to a hypoxic situation.
|
Maybe this is an unconventional idea, but you waste a lot of oxygen if you keep a high setpoint when you come up. You (or the ccr) inject o2, then you dump loop gas, then you go up, then you add O2, ....
on a square profile, this isn't a problem, but on a long sawtooth profile (eg following certain cave passages), the volume of oxygen injected then exhaled on ascents can rapidly eat through your O2 (as well as your dil)
clearly though you need to maintain a life supporting value (that works for your decompression calcs), but for an inspiration specifically, unless you do a bouyant ascent the solenoid will keep up. on a CMF ccr, you have manual control and so don't waste O2 as much.
John