Quote: (Originally Posted by
NEDIVER)
Sotos,
I think all of your points are well received. I think we need to know from here what the hypothesis is?
Are you simply looking for average by product weight post dive?
Are we setting up permitters for an international experiment? If so, we need to standardize all of the data. I would start by suggesting that, to your point, we weigh the scrubber post drying. To be more specific, we need to agree on a drying time and way of drying to be most accurate.
Secondly, I would make a suggestion that it be recorded in Kilograms/Liter. This way it doesn't matter the size of the scrubber, it can all be calculated into a constant.
I can't believe that this is starting to form into an actual experiment
I look forward to your thoughts and guidance on the hypothesis (after all it was your idea to begin with).
.
Tom,
The ultimate idea is to develop a simple method to be able to answer the very difficult question: Is my scrubber good for my next dive or shall I have to use fresh soda lime?
The hypothesis is that salts are being formed inside the scrubber. As the scrubber is being consumed its weight is being increased. There is a certain maximum in the scrubber content weight above which the scrubber is useless.
The question we are trying to answer is what that weight is in terms of percentage (compare to the weight of fresh scrubber)?
How are we going to meaure the weight? What procedure should we follow in order to have a standard method? We need to think about it and as a team to have an input on this idea.
My idea is to measure the scrubber cartridge empty (we need to do this just once). Then pack the cartridge with a given soda lime and record what grade that soda lime is. Then weight the cartridge before the dive.
Record dive profile, oxygen consumed, temperature inside the loop (if possible), temperature outside the loop (water temperature), record any major leaks in notes. Record any Carbon Dioxide poisoning symptoms in notes if occured.
After the dive, open the canister remove the cartridge, wipe off the excess water droplets around the cartridge neck and body, weight the cartridge in 5 minutes after opening.
Then weight it again before the next dive as some water might have been evaporated within this interval and start over again with recording the next dive.
Eventually when we have enough data we might try to approach the question again and try to see if we can reach to any usefull conclusions.
How is that?
Sotos