Need help in conductivity meter design

[priyesh p p]

Hi all,
I am planning to build a conductivity meter. I am using a conductivity cell of K=5 and i want to measure conductivity in the range of 4mS/cm to 6ms/cm .While doing a back ground study i came to know that using DC voltage for cell excitation is not a good approach as there is a chance of polarization and hence we should use ac voltage.Is there any other method for exciting the cell? because using ac may make my the circuit complex.
I am planing to use a voltage divider for the cell. Is this a good method ?
Hope some one will be there to help me.

 

[FvM]

mS/cm range cells are usually 4-electrode designs. They should be used in four-wire impedance measurement circuit with separate source and sense.

 

[moffy]

Use AC, because you can get electrode battery type voltages, and DC will give a false reading. Found this out building my own water conductivity meter.