Mailing List Archive

Mailing List: cavers

Message Display

Rich, was this when you did two 60 minute bottom times at 300 feet in one
day. I agree with you - there is no way there ever could be any problems
with a Cis Lunar, no matter how ricidulous it it. What does NEDU or Diving
Sytems know anyway compared to Bill Stone?

Just read the Wakulla 2 updates - there are clearly never any problems with
anything but the divers - everything works perfectly. In fact things go so
smoothly that these guys are able to complete dives in only "triple" the
time of the WKPP, and they have done in a mere 45 days what the WKPP could
only hope to get done in a single morning. In addition, the Cis Lunar is
proving invaluable as a decompresion tool, allowing divers to do three or
four times the required decompression.

Rick, this is one fine piece of technology, and I for one can understand
your enthusiam in lying about it so consistenly.


-----Original Message-----
From: Richard Pyle <deepreef@bi*.or*>
To: rebreather@nw*.co* <rebreather@nw*.co*>
Cc: "mike bruic" <mikebruic@di*.co*>
Date: Wednesday, January 13, 1999 6:27 AM
Subject: O2 Sensor Condensation


>
>> What's next???????? try flushing your O2 sensors after a 5 hr. bottom
time
>> (been there, done that). The sensor pod goes erratic from condensation
>after
>> about 2 hours. DECO on the unit can be done, but, F^$$$$&&&&#%$ the
tables
>> it provides (no I dont want pizza).
>
>I missed the thread that started this (seems as though someone cross-posted
>this to the rebreather list), but I'd really like some follow-up
>information.  I've "been there, done that" on 5-hour dives several times,
>and sensor flushing has always worked just as well then as it does 30
>minutes into the dive.  I've been on many dives over 2 hours in duration.
>The trend I've noticed on my rebreather is that erroneous O2 sensor
readings
>due to condensation almost never happen before about 90 minutes into the
>dive, and thereafter are rare (about one sensor per 15 dives of this
>duration), and always are immediately correctible with a sensor flush. In
>400 plus hours of dive time, only once did I have two simultaneous erratic
>readings, and again that was immediately corrected with a sensor flush
>(sensors worked fine for the remaining 120 minutes of the dive). It's also
>very apparent that the condensation problem gets worse in warmer ambient
>water (which at first seems paradoxical, but actually makes sense when you
>think about it).
>
>I hear a lot of talk about condensation causing serious sensor error, but I
>just don't see it happening.  My "reality checks" always confirm that the
>sensors are responseive and correct, and a flush with O2 at 20 feet
>consistently results in 1.62 on all three sensors.  On the rare cases when
a
>sensor does drop out of line from the others dure to condensation, a flush
>has always brought it back online immediately, and it has stayed on line
for
>the remainder of the dive (sometimes hours).
>
>I'm not trying to rehash the old arguments we've seen on this list (Lord
>knows we've beat that one to death) - I just want to get some more concrete
>information on these reported O2 sensor failures from condensation, and try
>to understand why they don't happen to me.
>
>Aloha,
>Rich
>
>

Navigate by Author: [Previous] [Next] [Author Search Index]
Navigate by Subject: [Previous] [Next] [Subject Search Index]

[Send Reply] [Send Message with New Topic]

[Search Selection] [Mailing List Home] [Home]