[PSUBS-MAILIST] CO in cabin

[Antoine Delafargue via Personal_Submersibles]

Hi James,
I am no specialist but when I searched for meters for Pilot Fish, I
was told that
these type of meters based on electrochemical cells are not be rated
for near 100% humidity, since they can misidentify water vapor or
droplets as CO2 (CO I don t know but could be similar effect)
Did you record humidity level?

regards
Antoine

On 10/2/15, James Frankland via Personal_Submersibles
<personal_submersibles at psubs.org> wrote:
> 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
>
>
> ​
>