If you use the same equipment at the same temperature with the same water and batch size with the same electrode spacing for the same amount of time...take a PPM reading with the meter after letting the CS stabilize for a few days and send samples to Ole Bob.
You'll get your own personal fudge factor/multiplier for your meter.
The difference between your reading and Ole Bobs numbers will reflect the ionic to colloidal ratio that you are making.
Ken
At 10:04 PM 8/18/01 -0700, you wrote:
>>>>
Hi Cheli,<<<<
Not to be argumentative with Ole Bob but for practical purposes, you can measure the ionic content of your CS fairly closely with the Hanna PWT meter. It is a conductance meter and when you apply the correction factor, it relates quite well. We routinely have samples measured using the atomic absorption spectrophotometry method and then correlate those readings to our PWT results. It is always quite repeatable. We check with 3 PWT's to average the reading. Not as accurate as Bobs method but very inexpensive over the long haul. It will give you thousands of readings and you only need to change batteries occasionally. The meter is $44.50 (factory price). It is temperature compensated and is accurate to + - 2% of full scale so it isn't off more than 2 parts at any reading. It reads from 0 to 99.9 uS (microsiemens) so it can measure your water first and then the CS afterward for a PPM determination.
This sounds like a commercial for us but the question begged to be answered. There is more than one way to measure CS and this is an inexpensive way for the general user. The unit can be seen at our website by clicking on <http://www.silvergen.com/ppm.htm>www.silvergen.com/ppm.htm Specifications for the unit are also on this page.
I hope Mike doesn't take umbrage at this blatant advertisement but newbies need to know of the various options.
Regards to all,
Trem
<http://www.silvergen.com>www.silvergen.com
----- Original Message -----
From: <mailto:[email protected]>Cheli Anne
To: <mailto:[email protected]>[email protected]
Sent: Saturday, August 18, 2001 4:25 PM
Subject: CS>ppm tester
What is a good way to test ppm? I have a Hanna TDS 1 tester, but it seems
VERY inaccurate if color is any indicator. The accuracy range is also very
large. Is there something that can be used that is accurate, yet
inexpensive? Cheli
----- Original Message -----
From: <mailto:[email protected]>Cheli Anne
To: <mailto:[email protected]>[email protected]
Sent: Saturday, August 18, 2001 4:25 PM
Subject: CS>ppm tester
What is a good way to test ppm? I have a Hanna TDS 1 tester, but it seems
VERY inaccurate if color is any indicator. The accuracy range is also very
large. Is there something that can be used that is accurate, yet
inexpensive? Cheli
---
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