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Had an interesting talk with a Cerametec rep the other day. Cerametec (1-800-748-5355) manufacturers a variety of O2 sensors, and their CAG 250 sensor has been mentioned in the OXYGEN HACKER book (www.conknet.com/~g_packard/oxyhacker.html) and on Roger Lacasse's great DIY gear page as a cheaper, longer life sensor. I think this is the industrial sensor that was mentioned here awhile back. The rep told me that there is no difference in quality between the med and ind. sensors - bascically, it's the same unit, only the med one is "optimized" for mixes towards 100% and the industrial one for mixed gases in the 0-60% range even though both are rated for use from 0 to 100%. This sensor goes for $50 or $65, depending on whether you buy it as an individual, or have a biz name and can convince them it's for resale. It's rated for 900,000 02% hours, as compared to 750.000 for the Miniox (though this probably doesn't accurately reflect the service life, and various vendors of this sensor are claiming it will last 4-5 years in typical dive/nitrox service, compared with 1-2 for the Miniox). There's a screw on hose adaptor available for it, for about $5 extra. Most interesting, if one has any lingering doubts about using an "industrial" sensor, is that he said they are all of a sudden selling a heck of a lot of them these days to the dive industry - he knew what I was talkin about the second I mentioned nitrox - and said that that my Pequot was probably a relabled Cerametec, and hinted that Scubapro, OMS and Oceanic are also using the same unit. I've been using a Pequot all summer, and have been very happy with its stability - unlike the Mini, it doesn't seem to give a damn about flow rates or movement - which the Cerametec rep said is characteristic of their unit. It has a hose connection on it, and I have found that I get exactly the same result whether I use a med. flow gauge/reg sampler, or just hold the sensor up to the hole in the valve, as G3 suggested here a while back. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send list subscription requests to `techdiver-request@aquanaut.com'.
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