Quote: (Originally Posted by James Appel)
When entering the % oxygen asked for (on the Classic Inspiration), the manual says it wants the % in the mixing chamber, not the % in the cylinder (Ok I under stand how to check on what % is in the mixing chamber).
But I was wondering, if you get a real good flush, WHY wouldnt the % in the mixing chamber be the same as that in the bottle. And if not (i.e. I dont get a 100% flush), it seems that this value would be variable and change each time I tried to flush and read what the % is in the mixing chamber as I would never really be able to flush exactly the same amount or precentage each and every time (ie if I cant get a 100% flush, there will always be a small amount of regular air in the mixing chamber).
I have been entering the % of oxygen in the cylinder (but then again I dont dive to the limits, and always keep to rec dive limits).
john,
first,I have only seen 1 unit that the percentage entered equaled the analyzed gas, and this unit had an IP above the recommended setting..
on most units its a 1-2% "error", once you find your number it will be consistent as long as you dont do anything to the solenoid or change the IP..
tosee how accurate you are calibrating it will take a few steps.. first you really need to know what the actual ambient pressure is and a good gas analysis.. I wouls start with 1% less on the oxygen and as close to the ambient pressure as possible.. no cal the unit as normal.. no we haveto verify it..
you need to get 100% in the loop.. expect to use alot of oxygen.. You have to do complete flushing.. start with one complete flush, (suck the loop to negative them fill til the opv vents..suck some more gas out and force gas from the exhale inhlale side through to the exhale side.... sucj the loop dry and do it again.. repeat 4 to 5 times...now we have to get the loop as close to abmient aspossible,make sure the opvis on the lowest settng, and start crushing the inhale counterlung to force gas out.. keep doing this until, you cant vent any more.. If the lungs are still "puffy" vent squeenze both counter lungs.. now look at your handsets if they dont equal ambient pressure multiplied by oxygen percentage (analyzed) the cal is wrong... get some air into the head, and cal again.. keep doing the above procedure until you find out what works then stay with it..