At 09:58 AM 12/28/2005 -0800, you wrote:
Hi Marshall,
The TDS reads about one half the ionic silver content so you double the
reading. The PWT reads about one to one. Does that make sense?
Once the PWT meter is calibrated using the standard solution of 84 uS the
meter is reading directly in uS from 0-99.9. That would also be 0-99.9
ionic silver PPM.
We do not calibrate the meters. That's up to the customer to do using the
calibration solution.
I hope this helps you,
Best regards,
Trem
customer_serv...@silvergen.com
www.silvergen.com
## I haven't run across one yet where the factory calibration was
off...but doing that calibration yourself is a whole 'nuther can of worms.
[Especially when you discover the factory supplied solution is off by
exactly 50%......which it usually isn't]
Hints:
1] Store both the meter and the solution in the same spot for a while
and Don't let the solution be warming up in your hand as you calibrate the
meter. [Temperature compensation compensates for the meters temperature]
2] Ignore the temperature chart on the solution bottle.
So long as the meter and the solution is at the same temperature, it all
works out.
Why Hanna doesn't tell you that in the calibration instructions, I have
no clue.
Hanna Tech should be named the product defense department.
The only info I ever got out of them was " The PWT is a good meter [it is],
Yer and idiot, [ I already knew that] , the solution is accurate [it
wasn't], the instructions are complete [they aren't]....so don't ask questions"
Ode
----- Original Message ----- From: "Marshall Dudley" <mdud...@king-cart.com>
To: <silver-list@eskimo.com>
Sent: Wednesday, December 28, 2005 9:43 AM
Subject: CS>TDS measurements
I am a little confused on TDS measurements. Trem says that when using
the Hanna
TDS meter he supplied me for measuring EIS, that the ppm of the molecular
ionic
part and the reading on the meter are approximately 1:1. The meter says
that it
is reading uS, but that is a nonsense unit, it has to be uS/cm or uS/in or
something, not just uS. Ole Coyote says that the reading should be
multiplied by
2 to get the correct ppm, and Frank Key at
http://www.silver-colloids.com/Papers/CSProperties.PDF indicates that TDS
meters
are calibrated for calcium carbonate, that has a ratio of .5 ppm/uS, and that
ionic silver has a ratio of about 1.1. Thus one should multiply the
reading on
the meter by about 2.1 to get an approximation of the molecular ionic silver
content which argees with Ode..
Then http://educate-yourself.org/products/tdsmeterdescrip.shtml indicates
a 1:1
ratio again which agrees with Trem.
So I am confused if I should be multipling the reading by 2 or
not. Trem, do you
recalibrate the meter for EIS before shipping it out, or is it the standard
factory calibration?
Can anyone enlighten me on this?
Thanks,
Marshall
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