Quote: (Originally Posted by UWSojourner)
The "thought" wasn't that the dry air prevents diffusion or acts as a cushion. I was just wondering whether the near-staturated warm air already inside the sensor was condensing when cooled slightly upon entry to the water. I hadn't heard of condensation problems of this magnitude (only 1.3 PPO2 at 20fsw and that after relatively short dives) so thought ruling out other factors was worth a shot.
No mV's yet, but I'll be diving for 5 days starting toward the end of the week and will try and get some data.
We get the same effect as Giles.
If anything, in this region we probably have the least difference between air and water temperatures. Air 27-33 water 28-29.
Giles your night dive would have been a good example of this.
IMHO the difference between loop temperature and water temperature is the key - we produce far more humidty whilst diving than enters the loop from natural humidity pre dive.
For you guys with a large difference between water and loop temperatures - where does the majority of your condensation occur? either in the lungs or in the canister I presume - for us perhaps there is another factor causing the condensation to occur in the head?
We have a new rulling this season 1 weekend in 4 will not be diving - so as it is the weekend nearest spring tides - this weekend is the one we are not diving, but next weekend along with mV I will log temperatures - pre dive, and then from the meg, loop and water temp, I suppose if I record what the computer says for water temp as well then we will have 2 points to calibrate that over as well
