Morning Carlos,
>> At 08:44 AM 5/31/2007, you wrote:
You are doing a much better job than most.
I am all confused about the uS/ppm issue.
Understandable.
If you continue to keep records on the changes, you will have some
valuable information that others will analyze and report what they think.
I have limited knowledge relative to chemistry.
Most of what I learned was by observation and hands on practice.
Others can answer your questions relative to uS better than I can.
>> some of the more knowledgeable ones in the list even said it
>> will last "for years".
I think they are right. I have given away CS over 1 year old and the
people have excellent results with it.
I meticulously have registered the V/mA readings every 15 minutes or every
30 minutes, depending on the length of the process in any case, in every
batch I have made since I started many months ago.
Very good. Not you have developed knowledge and instinct and could
continue without doing that if necessary.
Record keeping never hurts. I did that for a time, then stopped.
I still have the records but as long as my memory works, I use the times
that I remember and no longer make records.
I would suggest that you work with larger batches. I make one gallon per
batch, and often make two runs and two gallons.
After I finish, I introduce the data in the Faraday Equation sheet you
guys gave me at the beginning, in order to get an estimate on the ppm
concentration for every batch, which I try to maintain around 15 ppm
allowing for some slight loss later.
I think the uS will serve little if any purpose for you.
It is not as exact as the other parts of your methods.
>>The only sophisticated method I have in order to guess what I >> made is
to maintain a very low mA all along the process,
Are you controlling all this manually? I hope so.
As I have said many time, You have the best control system of all,
your brain.
When I used to study Chess and Computers playing chess, the one thing I
learned that was superior about the brain, relative to the computer.
The brain can change, reanalyze, ect, and the computers could not.
If you read about the size of the computer required to beat the human brain
playing chess, and the cost, you would be amazed.
>> small colloidal particles), no residues, and the conductivity mA
>> readings which are later fed into the Faraday equation sheet.
Excellent.
Now I am all confused. Even Ode said that the larger the batch, the
greater the changes. What am I getting and how can I give my EIS to others
not knowing if will be of any effect after some time?
Yes, I think you can. Just ask them about the results.
That is better than all the uS readings in the world.
The uS, and the EC meter is at best a compromise when working with
ppm. We have known that for years in the plant nutrient field.
It is handy, quick, and serves the purpose that was intended.
Everyone agrees that calculation and absolute methods are by far better and
more reliable. Still many professional growers use the
EC meter. Most realize the limitations.
If they use a high quality meter, they can learn things about plant feeding
within seconds that can allow them to make adjustments and corrections to
plant conditions, ........ whenever possible.
I am not saying that the EC meter does not server a valuable purpose in the
world of instrumentation.
The most knowledgeable, know that the things they do before they pick up
the EC meter is more important and is etched in stone.
For example, they know that a specific nutrient solution should have a
range of uS. If they make a check and it does not, then, someone left
something out or a tank is low or empty, or an injector pump may be out of
calibration or failed completely.
It serves as a quick reference and a check point to assist in finding the
problem and correcting it.
Honestly, I think you have studied and mastered the CS process.
Your worries are over, and you could stop worrying any time you want.
I do belive you like numbers, record keeping, and strive for perfection.
I am a little like that but after a time, I slack off a bit and things
still go right.
Maybe you will get some other replies to explain things better.
Wayne
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