Re: KillieTalk Digest V3 #1096

[BizEcology at aol_com]

It's worth investing a small amount of money in some TDS standard solution in order to check the performance of your meter with the new batteries.  Even if the performance is off, you can do the following:

1.  put the new batteries in and check the reading with distilled or DI water.  It should be zero.

2.  Check the reading with an 800ppm standard solution.  If it's not right around 800, you can try recalibrating the meter (a pain in the fundament) or just write down the reading.  Then go to step 3.

3.  Dilute the 800ppm solution with Distilled Water 50/50 and take another reading.

4.  Plot the actual vs. displayed ppm against each other on log paper.  With three points, you should be able to have close to a straight line, which will allow you to read the ppm accurately.  It's been a while since I used that technique to calibrate Atomic Absorbtion trace metals tests, but the technique should be valid.



<<From: "Clint Venable" <kg6ch at gte_net>
Subject: Re: TDS Meter batteries

I was trying to match the number on the battery.  They were quite expensive.
I found hearing aid batteries that were the same size and same voltage.  I
wonder if they could be substituted?  I was afraid to try it for fear that
they would make the meter read incorrectly, but still I wonder.>>

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