[PSUBS-MAILIST] CO in cabin

[Hugh Fulton via Personal_Submersibles]

James,  I suggest testing with sausage & onions.  Seriously though, I have found that hydrogen from the batteries will trigger CO alarms.  We have a ratio somewhere which relates H2 with CO.  So I think it must be coming from your batteries.  My alarm was a Crowcon T4 and that alarmed.  They must have to breathe somehow.  Hugh

 

From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of James Frankland via Personal_Submersibles
Sent: Saturday, 3 October 2015 2:58 a.m.
To: Personal Submersibles General Discussion
Subject: [PSUBS-MAILIST] CO in cabin

 

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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