What is "Full Scale" for a rebreather cell?

4ster · 25th October 2007, 15:02

They say there are no dumb questions, well "they" are wrong. It never stops me from asking anyway.

For the last day or so I have been trying to find a reference from the one of the cell manufacturers that explains what the specification "X% of Full Scale" actually means.

I am waffling between full scale being 0-100% (0-1 ppO2), or a wider range than that. We are using cells at partial pressures in the 1.0 to 1.4 range and testing in a pot to 2.0 and above. Is a partial pressure of 2.0 the upper end of full scale?

The definition is probably more complicated than above, could someone enlighten me?

**nigelh** · 25th October 2007, 19:39

Quote: (Originally Posted by 4ster)

For the last day or so I have been trying to find a reference from the one of the cell manufacturers that explains what the specification "X% of Full Scale" actually means.

FSD is the whole range of reading. Accuracies are normally quoted against that. Think of a meter with a pointer. Full scale is, well, full scale.

For the cells for the Inspiration the Telidyne spec says 0-2bar and 2% (well it did in 2000) so +/-0.04bar of any reading.

4ster · 28th October 2007, 21:58

Thanks, that makes sense.

25th October 2007, 15:02	#1 (permalink)
4ster Steve Sprague Current Rebreather/s: rEvo Other Rebreather/s: rEvo Join Date: Mar 2006 Location: Arlington, Washington Posts: 294	What is "Full Scale" for a rebreather cell? They say there are no dumb questions, well "they" are wrong. It never stops me from asking anyway. For the last day or so I have been trying to find a reference from the one of the cell manufacturers that explains what the specification "X% of Full Scale" actually means. I am waffling between full scale being 0-100% (0-1 ppO2), or a wider range than that. We are using cells at partial pressures in the 1.0 to 1.4 range and testing in a pot to 2.0 and above. Is a partial pressure of 2.0 the upper end of full scale? The definition is probably more complicated than above, could someone enlighten me? __________________ Steve "My problem is that I have trouble reconciling my gross habits with my net income." Errol Flynn
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25th October 2007, 19:39	#2 (permalink)
nigelh New Member Current Rebreather/s: Inspiration Vision Other CCR Other Rebreather/s: Inspiration Classic Other CCR Join Date: Mar 2005 Location: Brighton, Sussex, UK Posts: 837	Re: What is "Full Scale" for a rebreather cell? Quote: (Originally Posted by 4ster) For the last day or so I have been trying to find a reference from the one of the cell manufacturers that explains what the specification "X% of Full Scale" actually means. FSD is the whole range of reading. Accuracies are normally quoted against that. Think of a meter with a pointer. Full scale is, well, full scale. For the cells for the Inspiration the Telidyne spec says 0-2bar and 2% (well it did in 2000) so +/-0.04bar of any reading. __________________ nigelh
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28th October 2007, 21:58	#3 (permalink)
4ster Steve Sprague Current Rebreather/s: rEvo Other Rebreather/s: rEvo Join Date: Mar 2006 Location: Arlington, Washington Posts: 294	Re: What is "Full Scale" for a rebreather cell? Thanks, that makes sense. __________________ Steve "My problem is that I have trouble reconciling my gross habits with my net income." Errol Flynn
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