TDS standard WD-35653-09

VCoo71

VCoo71

Active member
so what should i set/calibrate my tds meter too

kinda confused with the 10,4.7,4.8, and the 7.0

TIA Randy

charlie
 
Those are ph calibration numbers...... As far as I know most TDS meters calibrate with numbers like 342 ppm.....1000ppm. You've got to find out what calibration number was used to initially calibrate your particular unit..
 
Yes I know the differance between us/cm, KCI, ppm etc.

Your instructions should tell you what the original calibration unit was used. What did it say ?
 
Factory Calibrated: our meters are calibrated with a 342 ppm NaCl solution. Meters can be recalibrated with a mini-screwdriver

charlie
 
Then go to tdsmeter.com and look up the 342 ppm solution they sell. I just bought some. Their cheap.

You must have an HM :)
 
i have this packet already sent from air water and ice

WD-35653-09 do i use the chart .... NaCl and set the meter at 4.7 ppm?

charlie
 
Charlie

Get the 442 solution and calibrate it to 7 ppm. This will make it more accurate when testing RO/DI water. You can recalibrate with the 342 for testing tap water to get an idea what it is. Ruffley 342 ppm NaCl = 482 ppm 442, close enough.
 
the solution i have now (WD-35653-09) says to calibrate NaCl at 4.7 and to calibrate 442* (*a calibration standard) at 7.0

almost like the WD-35653-09 solution can be used for diffrent applications..... its listed on the chart on Randys TDS page but still confusing....im still waiting to see what air water and ice reccomends! and what Randy has to say

thanks Boomer i would have never thought this could be so confusing!

charlie
 
the solution i have now (WD-35653-09) says to calibrate NaCl at 4.7 and to calibrate 442* (*a calibration standard) at 7.0

Yes that is the same, WD-35653-09 for either if NaCl then 4.7 ,if 442 then 7.00. 442 @ 7 ppm is more accurate for our needs
 
In the end, what you set it to doesn't really matter, as long as you know which scale it is. It is like setting a thermometer to deg F or deg C. The solution is just a fixed conductivity solution that has different values on different scales.

Regardless of the scale, I'd swap out a DI as soon as it rose above 1 ppm TDS. :)
 
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