Evening Neville,
Your last message, ( the long one ) was a good explanation.
At 03:31 PM 11/14/2008, you wrote:
Forget the ppm, just tell me why these two readings are so close.
EC is an accepted method of measurement.
If nothing changes, the good meters will often be very uniform.
Seems I have at least two, standards for calibration, and maybe three.
Plus my meter has 3 ranges, which makes it even better.( and of
course, better ones exist )
No matter how good the cheap meters are, you cannot expect them to
be in the class with better ones, and using multiple calibration points.
>> Wayne, here's one I found.......ec to ppm multiply by 1.5
Now, .......... If you had said, "this is good enough for most
practical purposes".
I would have said, ...........
Yes, that is a scientific answer, it is acceptable, and I agree. <grin>
Most of my EC measurement has been relative to plant solutions, not
the original EC, but leachate after the pants removed all the
nutrients that if could absorb,
( often measure water before additions, have spent hours adding drops
of acid to a 500 gallon take to get the EC just right ) A few drops
and test, a few drops and test.
I have measured this leachate from a complete greenhouse, and data
logged the information.
The sensors cost from 350 to 500 dollars, .......... and guess what ?
They have to be calibrated with an accepted standard, and at times,
an EC meter is used.
That is why I need a better meter
No matter the application, no matter the accepted accuracy, it is the
same ball game with
all the same problems.
Of course, I calculate the ppm, ( for plant nutrients ) which if very
critical at some stages or growth.
At other stage, I deviate from the industry standard, by 75 to 150,
or even 200 ppm.
I have proven some thing by doing this, many of which few people in
the world,knows.
Here is one. 50 cherry tomatoes on one cluster, they fork 5 times.
Ask the scientist and horticulturist how to do that. Some might be
able to tell you.
Here is picture of the proof.
http://www.fugitt.com/chertom.htm
You can see the forks, maybe not the 5 forks, but I have counted them
and the 50 tomatoes.
On a full size tomato, I have produced clusters 1 inch apart, and
can grow the stalk
50 feet tall, maybe 75 to 100.
And they can reach hundreds of feet in length.
Tell me anything you can about plants, or EC measurement either.
I am anxious to learn a few tricks I do not know.
Wayne
When you run out of anything to do, calibrate humidity, and make the standard
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