[PSUBS-MAILIST] CO in cabin

[James Frankland via Personal_Submersibles]

Hi All

Last dive at the weekend I was using an MSA Orion plus, multi gas meter.
This came from my uncle who is a safety officer at a UK coal mine.  Its all
in current calibration etc.

Anyway, I am using it really for the O2 sensor, however, it also has 3
other sensors for use in the mine.  Carbon Monoxide, Methane and Hydrogen.
(pity it doesn't have the CO2 sensor instead).

After about 10 mins of diving, I was getting an alarm of 30ppm CO.  This is
the level deemed safe for an 8 hour exposure to CO.  (Time weighted
average).

So, I wasn't particularly worried, but I am mystified where the CO is
coming from, even a small amount.  Battery pods are sealed shut.  Could it
be the scrubber?  The absorbent is calcium hydroxide and lime.

Any ideas anyone?
Thanks
James


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