Additional tests for colorimeter (pH, alkalinity, calcium hardness, etc.)
Are you willing to share the API results (bromothymol blue)?
I have pH calibration for API pH 6.0-7.6 and API High Range pH 7.4 to 8.8. The curves are non-linear (polynomial), especially for the high range. I am new to IO Rodeo Forum and I am wondering if there are discussions regarding non-linear calibrations (I looked and didn't find any).
Here's our calibration:
K.Jin, A.Aufdenkampe, B.Fisher
API pH 6.0-7.6 bromothymol blue
pH | Absorbance
I imported your data into the colorimeter-plot program and tried looking at a couple a nonlinear calibrations. The 4-th order polynomial fit looks pretty reasonable.
Any error message? or are the radio buttons disabled?
There isn't an error message. When I select 4th order and hit the plot button, nothing happens. But I choose linear, 2nd order, or 3rd order it works fine. Same data I posted, same that you used. I'm using that Mac OS software version 4, which appeared to be the current version when I looked yesterday.
(Thanks so much for your responsiveness!)
Yes I think you are getting hit with a bug in the nonlinear fitting which I fixed on (2016-09-04). https://bitbucket.org/iorodeo/colorimeter/commits/all
The fix is in the source in the repository (https://bitbucket.org/iorodeo/colorimeter/src), but I don't think I have packaged up new stand alone versions for Mac or Windows since the fix.
I'll try to put together some new standalone versions this weekend.
Hi @Will-Dickson, I haven't noticed a bitbucket update in the downloads, and I'm afraid I don't have sufficient Python experience to update it myself. Keep me posted and I look forward using the updated version. Thanks!
Sorry about the delay. I've put new versions of colorimeter software (colorimeter-v05) for Windows and Mac OS here https://bitbucket.org/iorodeo/colorimeter/downloads/ Let me know if you have any issues.
@Will-Dickson Thank you! I very much appreciate your help!
Is there any changelog available ?
I don't have a change log, but this is probably something I should start doing. There are the repository commits here
https://bitbucket.org/iorodeo/colorimeter/commits/all The new release incorporates all the changes starting at 2016-09-04
@Will-Dickson Hi. We bought io rodeo colorimeter kit last week and we downloaded your new software which is the version 5. We seem to have a problem. When we click the start button of the measurement program, the program exits. But we don't find this issue when using the version 4 software. I am using a Windows 10 OS.
I can reproduce the issue you are seeing. I will look into it this week and see if I can fix the problem.
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