MoistNeoprene
Registered
I just recently completed the PADI enriched air course. My coursework said that it was important to calibrate the O2 measuring device from a compressed air source having the same flow rate as the enriched air source you would later test on. My instructor disagreed, and said that it wouldn't make any difference if you calibrate based on ambient air and then tested on enriched air which is under pressure. After calibrating on ambient air, he then proceeded to test several enriched air containers, and came up at least 2 percent shy of the O2 that had been marked on each of the cylinders by the person who previously filled and tested them. I suggested that perhaps it was a result of him not calibrating on compressed air, and he dismissed me. Since I don't own an O2 measuring device of my own, I can't really test if this is true or not, but I'm just curious -- does it make a difference like PADI says, or is my instructor correct?