Hi Pavel,
  What you are seeing is VERY REAL!!!!!. That is the true conductance of your 
EIS.
  That number can be related to the silver ion concnetration. 
   
  If you would divide that number by 1.2 you would come very close to the 
actual PPM of your EIS.
   
  I can't tell you why taht happens but after making over 500 brews in 8 years 
and all of them have recorded data it is real.
   
  "Ole Bob"

Pavel Hochmut <[email protected]> wrote:
  Hi there,
I have some problem which I do not know how to explain. 
If I make EIS and I make the PWT test immediately after finishing the batch, 
the readout is e.g. 34 microSiemens.
If I repeat the measurement after some hours, I can read about 23 microSiemens. 
Within 24 hours after the batch finish I can measure 16,5 microSiemens in the 
same batch.
Can anybody give me the explanation of this?
Thanks Pavel H.