Re: [PSUBS-MAILIST] O2 & CO2 sensors

["Cliff Redus" <dr_redus@devtex.net>]

Alec, I to am working the O2 & CO2 sensor issue.  The www.amronintl.com site
has a number of analyzers for O2, CO2 and combined units. This is a great
site.  You have to set up an account with them to get prices.  Having set up
an account and checked out their prices, they are definitely set up for
commercial traffic.  Example, rack mounted O2 &CO2 unit (Sub Mk II - CO2,
O2, Depth) is over $7,000!

Best I have found so far for Oxygen sensor is to use the Maxtec, formally
Ceramatec, CAG-250 sensor.
http://www.cisatlantic.com/trimix/Analyzer/analyzer.htm  shows how you can
build a simple unit out of a CAG-250 sensor ($77) and some simple electrical
components.  Since I am using a PLC and a touchscreen display, all I will
have to do convert the mV signal from the CAG-250, that is proportional to
O2 partial pressure, into a 4-20 mA signal and waire to my PLC analog input
module.

So far I have not found a economical CO2 sensor. If anyone has a lead on a
economical 4-20mA or mV output sensor for CO2, please post.

Cliff


----- Original Message -----
From: "Alec Smyth" <Asmyth@changepoint.com>
To: <personal_submersibles@psubs.org>
Sent: Tuesday, September 10, 2002 2:09 PM
Subject: RE: [PSUBS-MAILIST] sofnolime


> Adam,
>
> I'm just building my scrubber. What are you using to monitor the O2 and
CO2? I'm curious if you've come across any economical analyzers you'd
recommend. Or are you bilding your own?
>
> thanks,
>
> Alec