Re: Re: [PSUBS-MAILIST] Which gases to detect?

[siblack10000@googlemail.com]

Hello

Just a quick word of warning regarding gas detector heads from one of the Companies mentioned above.  I have a project ongoing at the moment at work where a number of detector heads have been "poisoined" (Crowcon's words not mine) by use of cleaning chemicals close to detectors, with the result that the detectors had to be replaced at £400 pounds a piece.  I suspect it was a silicon or window cleaning chemical, as high level windows are located close to the detectors.  

So best bet might be to make the detector heads quickly removable for storage and check all chemicals you use near them against the detector data sheets to ensure you don't wind up having to replace them.

Also bear in mind detector heads have limited life so you need to consider replacement recommendations when deciding which to go with.  Just my experience.

Regards Simon

On , Jon Wallace <jonw@psubs.org> wrote:
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>     True, however all CO2 monitors are expensive and when you add the
>     cost of a separate O2 monitor and then consider some of the features
>     provided by Analox and Crowcon it's not too difficult to justify
>     going with a single all inclusive unit.
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>     For example, Crowcon sells a single gas (CO2) monitor called the
>     GASMAN with retail prices anywhere from $650-$800 (US).  Now add an
>     O2 sensor from OxyCheq for around $300 (US) and you're above the
>     cost of the Crowcon T3 with O2 and CO2 sensors included.  Even if
>     you purchase the OxyCheq "El Cheapo" unit and build it yourself the
>     combined cost with a CO2 monitor is going to be in the $500-800(US)
>     range.  Also consider that the Analox and Crowcon units allow you to
>     set alarms and collect logging information via computer interface,
>     and the Analox aspira unit is specifically certified for submarine
>     use.  Those may be nice features you can use and may be worth the
>     extra money.
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>     Jon
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>     On 4/26/2011 11:05 AM, James Frankland wrote:
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>       Hi Jon,
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>       Yes, that was the one i was thinking about.  Looks like a
>         nice unit but blimey its expensive.  I'll keep looking around
>         first, to see what else is available.   
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>       Thanks
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>       James
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>       On 26 April 2011 14:50, Jon Wallace jonw@psubs.org>
>         wrote:
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>         Hi James,
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>           I sent email to members back in early-mid march.  Members can
>           purchase the Analox Aspira for $1200 and the Crowcon T3 for
>           $899 through PSUBS.  I have not added an order page for them
>           yet so please send me an email if either one interests you.
>            If we had a bulk order of 10 or more I might be able to get
>           slightly lower prices, but I can't guarantee that.  I could
>           put up cash for one of either unit if that gets the ball
>           rolling.
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>             Jon
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