[PSUBS-MAILIST] 02 sensor and coms

Tue Mar 27 08:38:52 EDT 2018

The sensitivity on the pot isn't a lot.  Its not THAT bad, but its
enough for you to not trust it.  I just have it now as a backup, but I
wouldn't recommend it in all honesty.

On 27 March 2018 at 13:27, Jon Wallace via Personal_Submersibles
<personal_submersibles at psubs.org> wrote:
> 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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