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View Full Version : How do I calibrate this TDS meter?

sammie
03/08/2006, 05:40 PM
I got this TDS meter with the settup I bought last year, and I put batteries in and it works, just don't know how to calibrate it.

Any info anyone???

http://reefcentral.com/gallery/data/500/48850106_0609.JPG

http://reefcentral.com/gallery/data/500/48850106_0610.JPG

http://reefcentral.com/gallery/data/500/48850106_0611.JPG
asnatlas
03/08/2006, 05:56 PM
Get some distilled water from the store and place the meter in and hold down the button ?? I am guessing... maybe someone else can confirm...
radone
03/08/2006, 05:59 PM
R/O water from a friend? :D
asnatlas
03/08/2006, 06:02 PM
<a href=showthread.php?s=&postid=6912356#post6912356 target=_blank>Originally posted</a> by radone
R/O water from a friend? :D

LOL that would work also, distilled water has a TDS of 0, yes ??
verper
03/08/2006, 06:04 PM
<a href=showthread.php?s=&postid=6912378#post6912378 target=_blank>Originally posted</a> by asnatlas
LOL that would work also, distilled water has a TDS of 0, yes ??

That's my understanding and what I calabrate my TDS on.
radone
03/08/2006, 07:02 PM
Yes, but you don't get to see your buddies set up:D
thebrian
03/09/2006, 12:03 AM
RO will have a TDS of more than 0 normally though.
sammie
03/09/2006, 06:13 AM
What about other brands of TDS meters. Do they use a calibrating solution of a known TDS value because in reality no RO/DI system will produce a TDS value of absolutely zero.
TacoKing
03/09/2006, 06:17 AM
You need to get some calibration solution. Hanna makes some that's 1382 ppm, or something along those lines. Check out Hanna's web site for instructions on how to calibrate.

I think a few of the hydroponic stores around town carry the calibration solution.
cadams
03/09/2006, 08:17 AM
<a href=showthread.php?s=&postid=6915548#post6915548 target=_blank>Originally posted</a> by TacoKing
You need to get some calibration solution. Hanna makes some that's 1382 ppm, or something along those lines. Check out Hanna's web site for instructions on how to calibrate.

I think a few of the hydroponic stores around town carry the calibration solution.

Yep .. what he said. You need to calibrate with a known standard. I thyink theres a hydro store up on morse? "garden indoors"?

However, I'm a cheap SOB and I calibrate on a sliding scale. I test tap water, and a friends RO. If RO water is <10 .. and the tap water is ..well, alot....i'm happy. Its far from pinpoint accurate, but its sufficient for me when testing my RO.
sammie
03/09/2006, 06:55 PM
Taco I think your right because when I hold down on the on/off button it flashes cal and then flashed 1382. I'm going to try to get some on that calibration soln. and see what happens.

Thanks
szwab
03/10/2006, 09:41 AM
calibration fluid is the way to go.
not too expensive either.