Automated testing

Request new hardware or ideas for the controller
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Posts: 5328
Joined: Fri Jul 20, 2012 9:42 am
PostPosted: Sat Aug 26, 2017 7:17 pm
With all these automated Alk testers and now Neptune coming out with their Alk, Cal, and Mag testing automation....what can we do from an open source / RA perspective.

I'm sure we can improve on whats out there and make something great. I don't have the chemistry background to do it, but I'm sure we can code whats needed.

Anyone have any ideas we can share and build on?

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Joined: Mon Oct 15, 2012 7:21 pm
PostPosted: Sat Aug 26, 2017 9:52 pm
Where there is a will there is a way......Have always followed you coding examples to use myself and playing with the Particle Photon that was a major thread on testing for Nitrates,Nitrites and Ammonia.
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PostPosted: Sun Aug 27, 2017 8:14 am
89delta wrote:Where there is a will there is a way......Have always followed you coding examples to use myself and playing with the Particle Photon that was a major thread on testing for Nitrates,Nitrites and Ammonia.


You have any links?

Posts: 126
Joined: Mon Oct 15, 2012 7:21 pm
PostPosted: Sun Aug 27, 2017 10:57 am
lnevo wrote:
89delta wrote:Where there is a will there is a way......Have always followed you coding examples to use myself and playing with the Particle Photon that was a major thread on testing for Nitrates,Nitrites and Ammonia.


You have any links?

https://community.particle.io/t/sensors ... ite/6379/8

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PostPosted: Wed Oct 18, 2017 10:30 am
Interesting...what do we need to measure co2???

https://reefbuilders.com/2017/10/18/sen ... -just-200/

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Joined: Wed Apr 27, 2011 9:08 am
PostPosted: Thu Oct 19, 2017 9:50 am
I've searched around and the way to sense dissolved CO2 in water is to get a NDIR that senses CO2 gas and wrap it with a CO2 permeable membrane but impermeable to water such as expanded polytetrafluoroethylene(PTFE) tube or sleeve. It's explained in the paper that I linked. From the CO2 number and pH we can calculate the alkalinity in code.

Possible sensor
http://sandboxelectronics.com/?product= ... peberry-pi

CO2 Membrane
http://ipeweb.com/index.php/products/eptfe-tubes

Research paper describing the method and the diffusibility of the membrame.
http://ecohydro.ires.ubc.ca/pdfs/Johnso ... ,68-78.pdf

Tim
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PostPosted: Thu Oct 19, 2017 2:44 pm
Very cool Tim!!! This could be a real breakthru. Roberto, whats your thoughts?

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Joined: Fri Mar 18, 2011 6:47 pm
PostPosted: Thu Oct 19, 2017 3:47 pm
Maybe something like this?
http://www.pro-oceanus.com/mini-co2.php
Roberto.

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Joined: Wed Apr 27, 2011 9:08 am
PostPosted: Thu Oct 19, 2017 4:40 pm
That probe would be a neater package. Though I'm not sure what the copper/antifouling is for. Also, not sure what the cost for this would be.

Tim
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PostPosted: Thu Oct 19, 2017 7:32 pm
That is an analog sensor so need additional circuitry for analog 2 digital. The digital signal is a RS232 so more work involved I think, whereas the other is I2C.
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