In the equipment we used to make, a long time ago, the test ran until 
there was no further significant change or 15 minutes, whichever was the 
longer. We then mathematically analysed the curve of measured 
contamination against time and were able to extrapolate it to infinite 
time. The shape of the curve was used to give an idea of the nature of 
the contaminants (and their relative danger) and whether they were 
trapped under components or whether the substrate was leaching. All 
these data were on the print-out.

The danger of letting a test go along too long is that leaching from the 
substrate, which may actually be harmless, may give higher levels than 
the real contaminants.

Brian

Chris Schaefer wrote:
> Hey all,
> 
> There is a big hubub about how our Static Ionic test machine (600SMD) 
> should be configured. Meaning what industry standard and its interpretation 
> dictates if the machine should be setup in auto-terminate mode or set a timed 
> mode. Is a heating solution better for enabling improved measurement of OA 
> species or rosin species. We use our machine to measure product coming off 
> of two cleaning processes - one hot DI water and other semi-aqueous using 
> soap hot DI water. I interpret the standard as saying that the test should 
> continue until there is no more change in conductivity - thus meaning that it 
> should be in auto-terminate mode letting the machine do the math and shut 
> down when no change is measured.
> 
> Any thoughts... Thanks in advance.
> 
> Chris
> 
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