[PSUBS-MAILIST] scrubber performance

Thu Feb 2 23:04:43 EST 2017

David, hope that you have made some progress on the design work for
SeaQuester. When I first installed life support on the R300, I had sensors
distributed all over the boat.  What I have move to is packaging all the
Life Support related sensors in a single electrical box I call the AMOC
module.  AMOC is an acronym for Air Management and Oxygen Control. This
made it easier to maintain the system and made it easy to bench test. I
feed HP O2 from an external tank to this box.  It in turn breaks the
pressure and emits the O2 to keep the mole percent balanced.  The PLC
interfaces with the AMOC unit to monitor and control the air in the cabin.
If you are interested, send me your email address to
cliffordredus at sbcglobal.net and I will send you the DCI for the drawings
associated with the AMOC  unit and the drawings.  The axial flow scrubber I
use is the same one Alec used for Snoopy.  It has worked great. The PLC
ladder logic code around the life support system is pretty straight
forward.  What I like about the system is that it automatically compensates
for different sized humans in the boat but yet retains a manual mode in the
event both the main and auxiliary power are lost.  The assembly drawing for
the AMOC unit details all the sensors as well as all the Swagelok fittings
and circular disconnect.  This unit should work well with the
AutomationDirect DoMore CPU you have.

Cliff

On Thu, Feb 2, 2017 at 7:50 PM, David Colombo via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Cliff, Thanks for answering the question I was just going to ask.  Did you
> build any special case to mount for replacement? I need to back and see the
> line of code you used so I can use it in my DoMore PLC
>
> Best Regards,
> David Colombo
>
> 804 College Ave
> Santa Rosa, CA. 95404
> (707) 536-1424
> www.SeaQuestor.com
>
>
> On Thu, Feb 2, 2017 at 2:46 PM, via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>> I have had good performance from this company but with their K30 sensor.
>>  $85 and does give 0-5v analog output signal.  It span is 0-10,000 ppm
>> (0-2%).
>>
>> Cliff
>>
>> Sent from my iPad
>>
>> On Feb 2, 2017, at 2:37 PM, River Dolfi via Personal_Submersibles <
>> personal_submersibles at psubs.org> wrote:
>>
>> I did side-by-side tests on several low-cost ambient CO2 sensors when I
>> was doing air quality instrumentation work, and I eventually settled on
>> these units from COZIR.
>> http://www.co2meter.com/products/cozir-0-2-co2-sensor
>>
>> They're only about $70US, have built in self calibration, super reliable,
>> and have very low current draw compared to other sensors. The big rub is
>> that it isn't analog output, but serial.
>>
>> You would have to interface it with a microcontroller (which is an easy
>> enough job with a $20 Arduino) and have it set up to display to an LCD,
>> trip an alarm at critical levels, possible demand control of the scrubber,
>> other sensors, etc.
>>
>> I have an identical system built for the health department currently
>> running 70 (70!!!) of these sensors and others on battery power across the
>> city in the elements. They are that good.
>>
>> I recently found about half of a medical scrubber in a dumpster, so I've
>> been thinking about life support lately.
>>
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