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Re: [APD] dropchecker setup



 > Good luck!  Interested to see how your tank goes and hope you share
 > more scripts and ideas :)

Hi Carlo,

I think I found another bug?

Your bromothymol pH test card image...

  http://dropcheck.petalphile.com/public/pHrange_scale.png

...doesn't match up with my API pH test kit card.

My test card looks like the pH card here...

  http://www.hep.wisc.edu/~rader/api-test-cards.jpg

Then, with my 4.4 dKH ref soln, my card corresponds with...

  $ for i in 6.0 6.4 6.6 6.8 7.0 7.2 7.6; do phkh2co2 $i 4.4; done
  If the pH is 6.0 and dKH is 4.4, then the CO2 concentration is 132 ppm
  If the pH is 6.4 and dKH is 4.4, then the CO2 concentration is 52 ppm
  If the pH is 6.6 and dKH is 4.4, then the CO2 concentration is 33 ppm
  If the pH is 6.8 and dKH is 4.4, then the CO2 concentration is 20 ppm
  If the pH is 7.0 and dKH is 4.4, then the CO2 concentration is 13 ppm
  If the pH is 7.2 and dKH is 4.4, then the CO2 concentration is 8 ppm
  If the pH is 7.6 and dKH is 4.4, then the CO2 concentration is 3 ppm

When I put 50 ppm +/- 2.5 two green dropcheckers into your web form...
the low-end ref soln is 4.4 dKH...  and reading the left hand side it seems
your script assumes your test card corresponds with 6.0, 6.4, 6.6, 6.8 and
7.0 ...but by inspection it seems the last two color blobs are "off": they
look more like 7.0 and 7.6?

Most notably, my "blue" reads pH 7.6, whereas your web form indicates your
blue is pH 7.0?  (i.e. it reads 13.2 ppm co2 @ 4.4 dKH.) 

Oh, I just glanced at the source, and I see "$co2_min_60" through "$co2_min_70" 
:) 
I think, e.g. lines 131 and 132 (and maybe 130) are wrong?  Shouldn't they
calculate co2 at pHs 7.0 and 7.6?  (Ditto for the max checker range labels.)

steve
--

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