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AD7746 for Deionized Water level sensing

Category: Hardware
Product Number: AD7746


I'm trying to detect the DI water level in my small tank (160*30*17mm) and I found this note quite helpful. However, I still have some questions:

  1. Can I use this scheme to detect DI water level? or does it just work with salty water?
  2. Can I detect water level below C2 ~ REF level?
  3. Since my tank is relatively small:
    1. How do I calculate the track width and distance? 
    2. How long should the C2 ~ REF track be?  

The PCB i'm using has a 1mm thickness, copper is 1oz.

Thank you very much in advance.

Best Regards,