Quote: (Originally Posted by
RonMicjan)
When I calibrater a 4th cell (in adv housing i.e. meg) I pull the adv housing and put it in a small plastic bag and flow oxygen into the bag until I get a steady reading on the VR3 that is 4.76x the reading on air. I wouldnt calibrate it in the lung. Are you calibrating in air and verifying the cal in oxygen, or cal in oxygen and verify in air? Best to cal in oxygen and verify in air as operationally you will be closer to the cal poing when diving.
Hey Ron,
That's a great idea. I have been wasting heaps of O2 trying to get the cell to it's maximum reading whilst still in the CL. I tried your method calibrating it in a plastic bag and it was so easy not to mention the tiny amount of O2 used!!
On another note, I dived last week with the O2 manual add connected to the exhale CL and have to say I had no trouble going for the right manual add valve and the VR3 behaved beautifully and followed the handset readings within a couple of seconds.
One thing I did find was I needed to isolate the ADV as it was just too close to the MGB valve and was too easy to accidentally fire it. I am diving with a Drager FFM and have the ADV isolated almost full time now because to add to the loop I inhale through my nose and exhale through my mouth into the loop.
All up a win win situation......
Lance