Dive Rite O2ptima Owner's Manual download pdf (Page 40)

Dive Rite

Ch. 5 Pg. 4

CO Scrubber Duration

The O2ptima CO scrubber duration was conducted using the ExtendAir EP CO absorbent

cartridge and scrubber canister designed by Micropore. The Dive Rite recommended duration

for sport diving depths is maximum of 240 liters of CO produced. To avoid CO production

tracking the duration can be adjusted down to three hours in warm water and two hours in cold

water.

CO production can be approximated y tracking oxygen usage. Depending on the source of

energy (proteins, carbohydrates, fats) the ratio of CO to oxygen will be between .7 to 1.0. This

is called he respiratory quotient.

Defined as :

2 produced 2 consumed

RQ = CO / O

Carbohydrates 1.0

Fats 0.7

Proteins 0.8 - 0.9

Anaerobic respiration >>1.0

A diver with a normal diet and proper caloric intake will average approximately .9l of CO for

every liter of oxygen consumed.

Dive Rite s recommendation is based on testing performed by Micropore using the same

procedures and equipment as the U.S. Navy. At depths beyond recreational limits or near

freezing temperatures, scrubber duration is significantly shorter.

The U.S. Navy testing protocol calls for a CO production rate of 1.35 lpm at 40F at a series of

test depths. The fittest divers could not maintain the required level of activity to match the test

parameters for more than a few minutes. The temperatures used for O2ptima testing were

chosen to approximate typical recreational activities, 50F for cold water diving and 75F for

warm water diving. The maximum durations are based on recreational depth limits of 130fsw.

The CO testing graphs are available from Micropore.

1 2 ... 35 36 37 38 39 40 41 42 43 44 45 ... 57 58

No comments

Dive Rite O2ptima Owner's Manual Page 40