First CYA test with tf-100

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kevin.gt

kevin.gt

Bronze Supporter
Aug 7, 2020
31
Atlanta, GA
I received my tf-100 today and am struggling with the CYA test and when to stop adding mix to view tube. I still see the dot in the example pics from Taylor. I know it’s going to be difficult to advise from a pic, but how close to “done” am I in this photo? Maybe I should order the cya 50ppm standard to learn.
 

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When you do the CYA test, try this next time.

Once you have your solution ready, back to the sun, etc. Fill the vial to a line, say 80, lower the vial to your waist level and glance for the dot, you see it, add solution to the 70 line, glance, see it, repeat until you no longer see it with a glance. Then use the CYA value one step above the line you read. So if you stopped at 50, use 60 ppm CYA.

The vial is in logarithmic scale. So it is not viable to interpolate between the lines. Just use the whole numbers, such as 50, 40, 30, ....
 
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mknauss said:
When you do the CYA test, try this next time.

Once you have your solution ready, back to the sun, etc. Fill the vial to a line, say 80, lower the vial to your waist level and glance for the dot, you see it, add solution to the 70 line, glance, see it, repeat until you no longer see it with a glance. Then use the CYA value one step above the line you read. So if you stopped at 50, use 60 ppm CYA.

The vial is in logarithmic scale. So it is not viable to interpolate between the lines. Just use the whole numbers, such as 50, 40, 30, ....
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When I glance, should I be holding it feet off the ground, or is it okay to be sitting on a table? I noticed the dot was much more visible to me when I was “done” and sat it on the table vs. when I was holding it was my waist.
 
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