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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>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<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Personal_Submersibles [mailto:personal_submersibles-bounces@psubs.org] <b>On Behalf Of </b>James Frankland via Personal_Submersibles<br><b>Sent:</b> Saturday, 3 October 2015 2:58 a.m.<br><b>To:</b> Personal Submersibles General Discussion<br><b>Subject:</b> [PSUBS-MAILIST] CO in cabin<o:p></o:p></span></p></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>Hi All<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal>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.<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal>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).<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal>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).<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal>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. <o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal>Any ideas anyone?<br>Thanks<br>James<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal><img width=236 height=363 id="_x0000_i1025" src="cid:image001.jpg@01D0FEC0.00BF3010"><br><span style='font-family:"Cambria Math","serif"'></span><o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div></div></div></body></html>