My experience says that all the Hanna meters are VERY good at
repeatability, so once it reads right once, it will always read right.
The question is, what is right?
All the meters I have read almost exactly the same regardless of purchase
date or model but none of them match the calibration solution I bought from
Hanna...not by a long shot.
Ode
At 06:31 PM 6/7/2003 +0200, you wrote:
I did a Google search for 'tds-1 calibration curve' and got
http://www.google.com/search?q=cache:sOl1Pc1aKr0J:www.hannainst.com/downloads/instr/hi9835.pdf+tds-1+calibration+curve&hl=en&ie=UTF-8
and found an html version of
http://www.hannainst.com/downloads/instr/hi9835.pdf. which I have saved as
HI9835 Instruct manual.htm
If this is the TDS-1 that has been spoken of on the list in the past then I
am now greatly impressed. Measures conductivity, TDS, temperature and NaCl
1% accuracy 1% deviation and autoranging
eg Accuracy: EC +_1% of reading +_(0.05uS/cm or 1 digit whichever greater
TDS +_1% of reading +_(0.03uS/cm or 1 digit whichever greater)
Lowest TDS range is 0.00 to 14.99ppm
The TDS factor is default at 0.5 but can be changed within the range .4 to .8
The specs look OK to me.
Tony
ascottsil...@aol.com wrote:
Hi Jay and Mike,
The thing that scares me about the TDS-1 is that the accuracy is
guaranteed at plus or minus 10 PPM. So if you are measuring a solution of
10 PPM the meter can read anywhere from 0 to 20 PPM and still be in spec
as far as the company is concerned. Probably the wrong meter for CS
production at any cost.
Best wishes,
Andy
From: M. G. Devour
Well, Jay, there's value and there's value...
The TDS-1 from Hanna Instruments is a good bit cheaper, but it reads
from 0 to 2000 ppm. You'll be using it at the *very* bottom of its
range, which means the accuracy will not be tremendous. Sorta like
measuring grains of sand with a yardstick. Do you see what I mean?
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