What do you set your O2 injection to be?

stephenk

For those relying on the automatic injection of 02 on the meg, what do you set the o2 injection to? The default on my handsets (apex 2 version k) is 2.5 second injection with a minimum of 8 seconds off after this. I find this works fine for dives below about 30 meters and the set point is held pretty well, but below 30 meters in the region of 35 - 40m I find after an injection by po2 will can go as high as 1.45 when the set point is 1.3. At first I thought it was something I was doing, like descending and not injecting dil, but I've been carefully watching it over a number of dives in this range while in scapa last week and I'm sure that this happens when I've just swimming around on the level. For the last few dives I've changed the oxygen injection to be 1.5 seconds on 8 seconds off once I get to about 20 meters and this gives me a much better set point typically varying between say 1.26 and 1.35.

What settings do you use for this when not flying the unit manually? And how close does it hold the setpoint at different depths?

thanks
Stephen