Quote: (Originally Posted by
schford)
I also think whether the evodream HUD is classed as a primary depends on what you mean by Primary - for me Primary means it shows me the exact PPO2 of every cell.Stuart
The rEvodream HUD must be a primary then as it shows the exact PP02 of every cell, using a scheme almost exactly like the Mark-15 Primary. This is symantics in any case... the rEvodream provides a handset digital display of every cell and a HUD analog display of every cell. What you call each component really means zero.
Any system with (2) isolated PP02 measurement systems is going to require calibration on two instruments *minimum*. Have three like a KISS? You'll calibrate 3. Have an old Mark-15? You calibrate *SIX* potentiometers (one for each cell primary, one for each cell secondary). Have a new Mark-15 system (digital)? You'll cal twice: Once for the pod and once for the secondary (digital secondary). It's no big deal, but I'd say this: If you have to do *two* calibrations, it's likely that you have a safely redundant system. If you only have to calibrate *once*, you have a non-redundant system that is not anything that I would dive...
Calibration on the rEvodream/VR-3 combination? I do it every 6 weeks or so... even though both the VR-3 and the rEvodream's calibrate in less than 15 seconds each while sitting strapped in and ready to dive (if you had planned so badly that you needed to).
And I'm not sure that a single system failure needs always to mean an aborted dive. the rEvo has dual rEvodreams, each one fully capable of completing a dive all on their own. Failure of one would not, to me, mean "abort now", it would be "continue and fix after surfacing". That all depends naturally on a divers inclination, so actual mileage may vary. Single rEvodream configfuration fails? Definately an abort.
As some have mentioned, the Copis Meg has space for a 4th cell, the stock Meg has no room at all. My brain is turning to mush in this heat... I need more gin and tonic to keep the malaria at bay.
Dave