[PSUBS-MAILIST] scrubber performance

Fri Feb 3 10:30:18 EST 2017

Sounds like you are having fun coming up to speed on PLCs. Get your wife
to take the video of your hand waving.  We would all appreciate the
entailment value!  It a lot of fun to bench test components being operated
by PLC and see them come to life based on your code.  As to compass
heading, roll, pitch and yaw sensor, I use the Ocean-server
http://www.ocean-server.com/compass.html   OS5000-S Solid State tilt
compensagted 3 axes digital compass,  This is a RS-232 serial device. You
have to write some PLC ladder logic code to parse the ASCII string sent to
the PLC to extract the data,  I packaged mine in a small 1-atm aluminum
anadoized pod about the size of a tennis ball that I have mounted outside
the steel pressure hull behind the pilot.  Even though the DoMore CPU you
are using has several serial input ports that could be used for this
sensor, I ended up getted a dedicated coprocessor module that plugs into
one of the AutomationDirect PLC bases that enables me to write the parsing
code in BASIC and enables me to dedicate the coprocessor to this sensor.
It took me a while to come up to speed on RS-232 comuncations but I now
have this working petty much bullet proof.  The coprocedssor then sends the
heading, pitch, roll and yaw values to the PLC cpu to be used any way you
want them.  Currently, I am only using this data on my HMI.Cliff

On Fri, Feb 3, 2017 at 12:52 AM, David Colombo via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Hi Cliff,
> Its been slow going as I am finishing building my home. Should be finished
> in 45 days. But I have been making progress as I learn PLC coding and
> ladder logic in the evenings. Currently I am working thru the flight Joy
> Stick switch controls combined with a 4 position joystick base to control
> the (2) forward canard wings, (2) vertical thrusters  (2) horizontal
> thrusters, and (2) vectored rear thrusters to have a flight experience. I
> spend many hours in the evening when my wife is not looking waving my hands
> thru the air simulating flight and then coding the switches needed to make
> the maneuver. I'm sure it would be entertaining to record a video.  I am
> curious, are you using any gyroscopic sensors for pitch and roll? I'm
> thinking I need to have some build into the coding so as to limit my human
> abilities as safety overrides.
> The next step is to get a bench setup with the joystick and canard wings
> to run tests on the coding and for flight training purposes. Just need to
> finish the house first. Mean while I'll be waving my hands in the air for a
> while.
>
>
>
>
> Best Regards,
> David Colombo
>
> 804 College Ave
> Santa Rosa, CA. 95404
> (707) 536-1424
> www.SeaQuestor.com
>
>
> On Thu, Feb 2, 2017 at 8:04 PM, Cliff Redus via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>> 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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>>>>
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>>>
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