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Steve Lindblom Wrote: >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. I have had good results with this sensor. I have used it with a MiniOx unit, and it is stable even when you shake the sensor around (it uses a gel electrolite). The only problem is wiring it. They have 3 wiring versions of this sensor: 1) a Molex connector, 2) wires coming out the top, 3) a screw on plug (different than the MiniOx). I had to make a converter cable to make it work with the MiniOx. -Jon -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send list subscription requests to `techdiver-request@aquanaut.com'.
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