http://hyperphysics.phy-astr.gsu.edu/hbase/electric/resis.html#c2
http://www.hydrocheck.com/WhatsC&R.html
----- Original Message -----
From: "Steve Gregory" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, February 26, 2004 8:35 PM
Subject: [TN] Conductivity and Resistivity Correlation


> Hi All!
>
> Is there any chart, formula, or conversion that I can use to correlate a
> conductivity reading to a resistivity reading?
>
> The reason I'm asking is that I have a new batch cleaner that has been up
and
> running the last three weeks or so. One of the neat things with the
cleaner
> is that during the rinse cycle, it monitors the rinse water resistivity to
a
> setting that you program in the machine. If it reaches that pre-programmed
> resistivity setpoint before completing the number of rinse cycles that you
program,
> it will terminate the rinse cycles and go into the dry cycle. If it never
> reaches the resistivity setpoint within the number of rinse cycles that
you've
> programmed, it will display "FAILED" on the touch screen. You can then run
> another cycle, or start trying to figure out why the boards didn't come
clean.
>
> Well, everything has been going fine with the cleaner up until yesterday.
> Every batch of boards I ran failed the resistivity setting I had in the
machine.
>
> The manual recommends a setting between 350-750 kohms, I've had my setting
at
> 550 kohms from the beginning, and everything has been fine. I've had to
lower
> the setting to 400 kohms so the batches would pass. It's still within the
> 350-750 kohm range, but I'm curious why all of a sudden things won't pass
at 550
> kohm like it's been doing the few weeks.
>
> So I called tech support for the cleaner, and they feel that my input DI
> water may be going bad. I have a US Filters reverse osmosis filtering
system that
> dumps that water into Ion exchange columns and that water goes directly to
my
> cleaner. The DI system displays the conductivity of the output water in µS
> (micro-siemins). I want to correlate that to resistivity to see if my DI
water is
> truly going bad.
>
> Thanks!
>
> -Steve Gregory-
>
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