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
[email protected] 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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