[PSUBS-MAILIST] 02 sensor and coms

Tue Mar 27 08:27:47 EDT 2018

A board mount with screw driver access would probably be best, but it looks like OxyCheq sells a ten-turn pot for the kit.  The issue James enunciated is almost certainly with the potentiometer not being sensitive enough because even my $1100 Analox uses the same type gas sensor as El Cheapo and other rebreather analyzers.  It's all in the interface...I'm expecting my Arduino based analyzer to be as sensitive as the Analox since I will be passing the voltage through a 16 bit ADC and there won't be any potentiometer involved.
Jon

      From: Al Secor via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Tuesday, March 27, 2018 7:55 AM
 Subject: Re: [PSUBS-MAILIST] 02 sensor and coms

I wonder if replacing the single turn pot with a ten turn pot with a recessed access would help the sensitivity? Al Secor

      From: James Frankland via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Tuesday, March 27, 2018 6:44 AM
 Subject: Re: [PSUBS-MAILIST] 02 sensor and coms

I wouldn't get that "el cheapo" one.  I have it and its meadiocre at
best.  Its soo sensitive on the control pot, you are never quite sure
if its reading right as just the slightest bump and it moves.  I know
Scot had the same one and experienced the same.  I think it would be
ok for what its intended for, mixed gas diving.  But for permenant O2
monitoring, its not so good.

I use a crowcon disposable one.
https://www.crowcon.com/uk/products/portables/clip-sgd-single-gas.html

Going to check out that one Hank mentioned now though....

James

On 24 March 2018 at 22:45, hank pronk via Personal_Submersibles
<personal_submersibles at psubs.org> wrote:
> Rick,
> Just Google "confined space O2 meter."
> Hank
>
>
> On Saturday, March 24, 2018, 2:09:09 PM MDT, Rick Patton via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> Hank,
> how can I read up on them and get costs?
> Rick
>
> On Sat, Mar 24, 2018 at 10:03 AM, hank pronk via Personal_Submersibles
> <personal_submersibles at psubs.org> wrote:
>
> Rick,
> You can also buy a O2 meter that just tells you when the O2 is low or high
> but does not give percentage.  They are pretty cheap.
> Hank
>
> On Saturday, March 24, 2018, 1:50:06 PM MDT, Rick Patton via
> Personal_Submersibles <personal_submersibles at psubs. org> wrote:
>
>
> Thanks guys,
> since I didn't hear anything back at all from my post, I figured it didn't
> go out properly. I plan on keeping it as simple as possible regarding lap
> tops and things hooked up to it as that stuff is way out of my league!
> Rick
>
> On Sat, Mar 24, 2018 at 9:03 AM, Alan via Personal_Submersibles
> <personal_submersibles at psubs. org> wrote:
>
> Rick,
> I did receive the original post, but like Jon & Cliff I am going to
> use a computer to receive the signal from my sensors.
>    It sounds fancy, but instead of having several sensors for O2,
> CO2, pressure, humidity, temperature, water temperature etc
> with their individual electronics & display units, you can pick the
> sensors up reasonably cheaply & use the one computer& display
> screen for all.
> Alan
>
>
> Sent from my iPad
>
> On 25/03/2018, at 7:43 AM, Alan via Personal_Submersibles
> <personal_submersibles at psubs. org> wrote:
>
> Rick,
> there is the Famous Elcheapo O2 analysing kit, that you assemble.
> The cost is not a lot more than the included sensor.
> I am not sure of the voltage, but would guess you would use a 9V
> battery.
>  https://www.oxycheq.com/el- cheapo-ii-analyzer-kit.html
> Alan
>
> Sent from my iPad
>
> On 25/03/2018, at 5:55 AM, Rick Patton via Personal_Submersibles
> <personal_submersibles at psubs. org> wrote:
>
> Thanks Jon
> Yeah I hope he was mistaken as well though he was in tech support at OTS. If
> that’s the case, I’ll lose coms less than a third of the way down to my
> design depth!
> Hank, didn’t you post once about an affordable O2 monitor that you were
> using?
> Rick
>
> On Sat, Mar 24, 2018 at 12:40 AM Jon Wallace via Personal_Submersibles
> <personal_submersibles at psubs. org> wrote:
>
> I saw it Rick, just haven't completely decided yet so didn't respond,
> however you did get me thinking about it again and I believe I'm going to
> use an O2 sensor intended for rebreathers that will be interfaced with an
> Arduino microprocessor.  They are manufactured by Analytical Industries and
> distributed by Dive Gear Express, most under $100 and have a life of two
> years.
>
> I have no experience with OTS yet but sure hope it is better for more than
> 100 feet.
>
> Jon
>
>
> ________________________________
> From: Rick Patton via Personal_Submersibles <personal_submersibles at psubs.
> org>
> To: psubs chat room <personal_submersibles at psubs. org>
> Sent: Saturday, March 24, 2018 12:32 AM
> Subject: [PSUBS-MAILIST] 02 sensor and coms
>
> I sent out a post the other day regarding what others were using for a 12
> volt oxygen sensor but didn't get a response so not sure it went threw??
> Maybe I typed in the wrong address? I was on the phone with tech support at
> OTS the other day and asked him what range I could expect under standard
> conditions and he said about 100'. Can anyone out there speak to that?
> Rick
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