[PSUBS-MAILIST] CO2 ppm

[swaters via Personal_Submersibles]

James,
That is soooo helpful. I started with the el chepo and had the same experience of it being really sensative. Again thank you very much!
Thanks,
Scott Waters




Sent from my U.S. Cellular© SmartphoneJames Frankland via Personal_Submersibles <personal_submersibles at psubs.org> wrote: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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