A: With regards to the 3060E O2 scrubber, the scrubber can scrub 200 cc of pure 100% O2 (per vendor O2 scrubber life information). Using this information, calculations were made.
TAI has generated a formula depending on flow rate used for scrubber life in two cases, 1 ppm and 400 ppb.
Note: Enter flow in box provided and life calculations are automatically calculated. We assumed 70% efficiency due to some air exposure during initial connection.
-- If 1 ppm of O2 is being scrubbed at a rate of 150 ccm, this translates to 2.5 years of life. Considering that during the connection of the scrubber to the analyzer, the scrubber is exposed to air (21% O2) for a brief time, the life of the scrubber will be decreased to approximately 1.5 to 1.75 yrs (at 1ppm at 150 ccm). If the scrubber is exposed to air even longer, the life will decrease substantially.
-- If 400 ppb of O2 is being scrubbed at a rate of 150 ccm, than the scrubber life increases by factor (1ppm / 400ppb = 1000ppb / 400ppb = 2.5 times). So, 1.5 to 1.75 years times the 2.5 factor = 3.75 to 4.37 years at 400 ppm level at 150 ccm flow.
FYI, we have scrubber in the lab which supplies many O2 instruments (as many as 15 units - Model 316 and 3000 type), and the scrubber has lasted 2.5 years.
