Morning David,
Thanks David for some comments and ideas.
>> At 05:11 AM 6/2/2008, you wrote:
I agree with most of them, a few I do not.
>>Not really true. Most reasonable people understand pretty quickly
that a meter is just a guide.
Now that is a Great Statement.
That will be news to all the makers of PPM meters.
No, they know it already. And that was not MY IDEA. Others have said
the same thing.
One is a JOKE. They call it Both, and the ranges are not the same.
1 to 9999 of EC and 1 to 8900 or similar for PPM.
There's no 'move' to combine EC and PPM. There are PPM meters, and
there are EC meters. Some meters have offer both in separate modes
but no-ones trying to 'combine' them.
Yes, and that was not my idea either. The Industry said it. Maybe
long ago.
Just about every measuring instrument gives an 'approximation'. How
accurate is your speedo? Most people can live with this fact.
Certainly ! You know that and I know that, but I fear many do not.
TWO BIT meters are fine when used in their place and as long as your
expectations aren't unreasonable.
Yes Indeed.
As the author of the 'TWO BIT' statements you refer to perhaps I
should be offended but I can barely be bothered to respond.
How did I do that. OK....... I am sorry.
Again, even you suggested the same thing.
TDS or PPM meters measure the electrical conductivity of the water
and, using a built in program convert that to an approximate PPM
using known conductivity>ppm values.
Yes, and I knew all that also.
They are pretty reliable in the ranges they are designed for and when
measuring what they designed to measure (Basically thats dissolved
salt). Using a TDS or PPM meter
to measure CS (way down at the bottom of the range) is pushing things
to extremes but nevertheless I've found they are extremely handy and
surprisingly consistent.
OK........... I understand all that also.
To say, as you do, that 'no PPM meter exists in the world today' is a
bit like saying no 'Laser Measuring Device' actually exists.
Again, many others have stated this, not just me.
Technically thats true because laser beams doesn't actually 'measure'
anything but by adding a little step to the equation (like knowing
the speed of light) then they do a pretty good job and, I think,
satisfy the Fair Trading authorities, and NASA.
NO doubt they use the best they can get. Not the 19.95 specials.
One other thing that may be confusing you Wayne. PPM isn't an
indication of the number of particles anyway. Its an alternative way
of saying 'milligrams per litre'.
Of course I knew that.
Nothing is confusing me. I spent one solid year studying sensors, and
found a manufacturer that would build anything I wanted.
I can calculate PPM, forward, backwards, and crossways.
I even wrote a program, Backwards PPM Calculations.
I know how to get it right. Scale Factors and Offsets, and everything else.
I became tired or working Scale Factors, I wrote a program to do that.
I can specify then number of decimals, 4, 10, or 99. Anything you want.
The statements below are certainly not 'half truths' or 'lies'. In
fact they were very carefully worded to provide maximum clarity for
the reader. Perhaps that something you should consider in your own
ramblings.
Ramblings, Another Joke.
Even Your message suggest virtually everything I have said.
You stated they are approximations. And I agree with that.
WE don't disagree on that, or most things. We just say it a bit
different.
Most of my experience is with computer based
EC, pH, Flow Rates, Liquid level measurement, Drop Counters, Sunlight
Sensors, Event Counters,
And anything else you can dream up.
This is a world not understood by many. The hardest part of all is
Calibration and Standards of devices. Usually involving Laboratory Grade
instruments.
The computer industry has messed up lots of things. One customer has a
board that cost 2
grand, and the software is over 3000. Today you cannot buy a motherboard
for that particular monitoring board. The last computer I built and
installed there worked 9.5 years, 24 hours per day.
They are eliminating serial ports on computers, and millions of special
software still uses serial ports.
I hated to see my customer have to spend 5 grand for the lack of a 100
dollar mother board.
Finally managed to find an old one and get the critter going again. Over
100 systems report to this one computer.
We use some expensive small servers, 8 to 10 Grand, the best in the world
today for the application.
Cameras that cost 25 K, 175 power zoom lens, and often catch many bands of
thieves.
We work at several Government Installations across the south.
So when you say I am confused, you might be. No two Bit meters confuse me.
In case you missed it, I designed and manufactured medical equipment a few
years.
I would like to see some standardization in the low cost instrument field.
Call them what they are, and not sell them for specific tasks.
And I fully realize that may be best and serve the purpose so people can
buy what they need.
I will rest my case on this for a time. I don't have to prove anything to
anyone.
Wayne Fugitt, RNX
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