Throw the cell out.
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See that's the real concern I have here. Is there something with the calibration procedure itself? People have said "PO2 is PO2", but the point is that we are all relying on whatever procedure we use to put 100% O2 on the cell face. If that isn't happening with reproducible precision, then everything downstream is off as well.
Not getting the same results with 2 calibrations in a row means the calibration sequence or instructions are wrong. 2 calibrations 10mins apart? You need to be getting exactly the same answer. My guess is there is not enough flushing to ensure a 100% o2 content in the loop.Well the calibration procedure on my unit is very reproducible done even once. But I have noticed that I get 1-2 mV higher readings with a second run. Again very consistently.
It may be due to oxygen diluting with air or a cell response time issue, but it is consistent. Some divers have noticed the same with newer batches of JJ-CCR cells and think it is due to slower response time of their new cells.
Not getting the same results with 2 calibrations in a row means the calibration sequence or instructions are wrong. 2 calibrations 10mins apart? You need to be getting exactly the same answer. My guess is there is not enough flushing to ensure a 100% o2 content in the loop.
Not getting the same results with 2 calibrations in a row means the calibration sequence or instructions are wrong. 2 calibrations 10mins apart? You need to be getting exactly the same answer. My guess is there is not enough flushing to ensure a 100% o2 content in the loop.
the unit is very clean and this has been from the beginning, but that’s a good point. Will try the cell checker (although I have the mini checker which uses the rebreather head)