CS>Hanna Meter Model Number
From: Wayne Fugitt
Date: Fri, 15 Oct 2004 12:34:48
> Evening Mike,
> At 09:54 PM 10/14/2004, you wrote:
>> Anything that gives 20uS or more with a calibrated Hanna should
>> be ok.
> Can you tell us the exact model number of the Hanna Meter? I have
> an EC meter I use for nutrient solutions.
> For CS, I rather use the same model that everyone else uses. Plus,
> I hope the Hanna is not as much trouble to calibrate as the one I
> use.
> Wayne
Hi Wayne,
The tester most people recommend for cs is the Hanna Model HI 98308
PWT, shown here:
http://www.hannainst.com/products/testers/pwt.htm
Here is the operating manual:
http://www.hannainst.com/downloads/instr/hi98308.pdf
It is available at various prices from about US$51.75 to US$64.00.
However, Trem at Silvergen is the west coast distributor, and he
includes a bottle of calibration solution. Trem is very familiar
with using the Hanna to measure cs:
http://www.silvergen.com/ppm_meter.htm
Correction Factors
~~~~~~~~~~~~~~~~~~
You will see various correction factors ranging from 1.2:1 to 2:1.
They are all wrong. Here is 2:1 and 1.7:1
"Has a digital readout that reads from 0.1 to 99.9 yS/CM. Which
translates to aproximately 0.005 ppm to 49.95 ppm. The digital
reading is divided by two as a simple method to interpret the
reading into approximate PPM of the tested solution, this allows
for 1 -2 PPm already present at start. The more accurate approch
is to note PPM in water at start, divide the finished product by
1.7 and subtract the initial PPM that was present. Comes with
manufacturer 1 year warranty. Our tests show a level of accuracy
compared to mineral digestion tests done at an EPA FDA approved
lab of approximately 1-3 ppm variance. Most tests match closely.
Comes with Calibration solution."
http://www.wishgranted.com/ec_store/item12.htm
Here is 1.2:1
"A standard conversion factor used by many producers is 1.2;
however, this number will not be entirely accurate, and depends
upon many variables that cannot be easily isolated. The 1.2
specification applies to Silvergen Colloidal Silver Generators
specifically, and was developed by comparing a laboratory analysis
(total silver content measured in PPM) with readings from the
Hanna PWT meter. Silvergen colloidal silver is 80-85% ionic,
15%-20% particulate."
http://www.silvermedicine.org/colloidal-silver-ppm.html
What you really want is the ionic content - the particulate content
consists of various oxides which are inert and have no biological
activity. Contrary to common myth, there are no pure silver
particles in cs. There is no way to generate them through
electrolysis. So you can disregard the particulate portion.
I researched the relation between conductivity in microsiemens read
on the Hanna and the ionic content in ppm. Compiling information
from various sources, I found that 1 uS = 1 ppm. I posted the
results here some time ago but don't have the url handy.
Note the uS readings may be affected if the cs is contaminated or if
various substances like H2O2 or baking soda are added. Accidental
contamination could be from bleach, vinegar, etc. used while
cleaning. The salt test is a simple way to verify the ppm.
Mike Monett
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