[PSUBS-MAILIST] Scrubber color sensor

[hank pronk via Personal_Submersibles]

Alan,Yes KIC will wind me up lol.  I love the dual scrubber plan, I am doing the same.  No model T, but no power windows and a rubber floor mat.  Hank 

    On Monday, April 24, 2017 2:15 PM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
 

 Hank,I nearly said it is in line with my KIC ( Keep It Complicated) principal towind you up.In my case, in a very small hull, I will have a lot less time to respond ifmy air content / pressure changes. That's why I'll need 2 scrubbers like DW. I am going to pursue this colour sensor thing as it's just anotheraid to help monitor absorbent usage. As you say monitoring the timeis the best way, & I'll probably do that electronically too!BTW, I notice from your video thar you are not driving a model T Ford anymore!Alan


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On 25/04/2017, at 12:14 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:


Alan,I love your solutions,  not within the KISS principal mind you.  I like your idea to use a toy helicopter levelling system to control solenoids for level sinking.   I just keep track of the time my scrubber is on. Hank 

    On Sunday, April 23, 2017 10:14 PM, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
 

  I like the idea of color indicating absorbent, only problem is my scrubber will be positioned where I can't see it.I just did a quick Google & came up with this color sensor.RGB Color Sensor with IR filter and White LED - TCS34725
  
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RGB Color Sensor with IR filter and White LED - TCS34725
 By Adafruit Industries Your electronics can now see in dazzling color with this lovely color light sensor. We found the best color sens...  |  |

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If you put multiple sensors down the outside of an acrylic scrubber canister you couldread the color change in the absorbent & have it displayed elsewhere. You could perhaps use the one sensor board with multiple sensors. Another variation isthat you may be able to pick up the heat from the chemical reaction with the infraredsensor & monitor levels that way.  An additional thought on this subject is to put a second CO2 sensor at the outlet of the scrubber to pick up early when there were higher concentrations of CO2 coming out.So sensor 1 is the ambient atmosphere concentration & sensor 2 is showing whatlevel of CO2 there is from the scrubber that will be mixing with the atmosphere.Alan

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