Re: [APD] double dropchecker setup

[rader at hep_wisc.edu]

 > >Another thought: overcome the issue of how your eye sees green by comparing
 > >the dropchecker with actual known bromo blue solutions... make 5ml vials
 > >with stable pH ref. solns. + bromo. blue... e.g.  6.0, 6.4, 6.6 and 6.8
 > >!?
 > >http://delloyd.50megs.com/moreinfo/buffers2.html#buffer
 > 
 > This is a simple and awesome idea I have not seen before.  I'm
 > interested in where you go here if you play with the idea.  Much
 > cheaper than pH probes.

...I'm decided to not do this because my (and my family's) eyes CAN clearly
discern between "yellow-green" (pH >= 6.4) vs "some shade of green" (pH < 6.4).

And FWIW thus I'm going to "engineer" a double dropchecker setup like so...

 Target: 35 ppm CO2 +/- 5ppm
 
 Low-range Dropchecker:
   3.0 dKH...
    green < 35 ppm
    yellow-green >= 35 ppm
 
 High-range Dropchecker:
   3.4 dKH...
    green < 40 ppm
    yellow-green >= 40 ppm
 
 Usage:
   low-range green, high-range green ... < 35 & < 25 ergo... < 35 ...  INCREASE co2
   low-range yellow-green, high-range green ... >= 35 & < 40 ergo... ~ 35 ...  OKAY co2
   low-range yellow-green, high-range yellow-green ... >= 35 & >= 40 ergo... > 35 ...  DECREASE co2

steve
--

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