[PSUBS-MAILIST] CO2 ppm

[James Frankland via Personal_Submersibles]

Hi Scott,

I looked into quite a few instruments.  I was going to get the Analox one,
but its expensive and Jon said he bought one and didnt rate it.  Crowcon
make some good multi meters but again, expensive.  So, i bought one of
these for CO2 which is really good.  Only goes up to 1% mind but that
should be far too much anyway.  Has an alarm and various features.

http://www.test-meter.co.uk/anton-carbon-iaq8494-dioxide-meter-vent-check/

For O2 i first bought the "el cheapo" kit which is "ok", but it seems
really sensitive.  The slightest movemnt of the dial sends the reading all
over the shop.  i wasnt 100% confident with it so i bought this Crowcon
personal O2 monitor.  Its completely idiot proof, has a high and low alarm
and seems really accurate.  I use this and the "el cheapo" now together.

http://www.crowcon.com/uk/products/portables/crowcon-clip-single-gas.html
Emile sent me a link to one he uses which looked really good as well.  Cant
remember which one it was, (Emile, it was the blue one)!

kind regards
James
On 8 June 2014 19:47, swaters via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

>  Thanks for the help on the O2 and CO2 meter guys.
> -Scott Waters
>
>
>
>
>  Sent from my U.S. Cellular© Smartphone
>
> Emile van Essen via Personal_Submersibles <personal_submersibles at psubs.org>
> wrote:
>
> For O2 is this a nice instrument:
>
>
> http://www.conrad.com/ce/en/product/123122/Greisinger-GMH3691-and-GGO369-Oxygen-Meter-with-Sensor?queryFromSuggest=true
>
>
>
> It has adjustable Hi /Lo alarms and is temp/ pressure compensated.
>
>
>
> For CO2  Look at beer brewery suppliers. They use portable and wall
> mounted analyzers where beer is stored in large tanks..
>
>
>
> Emile
>
>
>
>
>
>
>
>
>  ------------------------------
>
> *Van:* Personal_Submersibles [mailto:
> personal_submersibles-bounces at psubs.org] *Namens *via
> Personal_Submersibles
> *Verzonden:* zondag 8 juni 2014 2:07
> *Aan:* Personal Submersibles General Discussion
> *Onderwerp:* Re: [PSUBS-MAILIST] CO2 ppm
>
>
>
> Does anyone know of a O2 and CO2 meter that you can buy off the shelf?
>
>
>
> Thanks,
>
> Scott Waters
>
>
>
>  -------- Original Message --------
> Subject: Re: [PSUBS-MAILIST] CO2 ppm
> From: "Sean T. Stevenson via Personal_Submersibles"
> <personal_submersibles at psubs.org>
> Date: Sat, June 07, 2014 4:39 pm
> To: Personal Submersibles General Discussion
> <personal_submersibles at psubs.org>
>
> Hank, 0.5% by volume is your maximum allowable, which is 5000 ppm, so
> technically that reading is okay; however if that is steady state, it
> doesn't provide a lot of margin for error.  How are you measuring the CO2?
> I would check the calibration of the transducer, and also check that in an
> elevated CO2 environment (unmanned), turning the scrubber on will bring the
> level down to ~0 after some period of time.  The scrubber needs to keep up
> with the worst-case breathing / metabolism rate of the occupants.  Under
> ideal conditions (low stress, low exertion, fresh scrubber media), the
> scrubber should be capable of keeping the CO2 level at the low end of the
> allowable range.  A slow and steady climb in level is your indication that
> the media is becoming exhausted - you don't want to lose that early warning
> by operating close to maximum.
>
> Sean
>
>
> On 2014-06-07 17:26, hank pronk via Personal_Submersibles wrote:
>
>   I am heading to Slocan Lake tomorrow for work and a sub dive.  Today I
> did another life support test and the best I can do is 3700 ppm CO2, I
> think the absorbent is not so good or something.  Is 3700ppm good to go.
>
> Hank
>
>
>  ------------------------------
>
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