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I am wondering how parasitic parallel resisitance affects capacitance measurements? We have an application where electrodes will be immersed in the water, but water conductivity will vary stronlgy (e.g. sea water and fresh water). Application only needs to detect water presence - no absoulte values are needed. However, no re-calibration is allowed once the device is assembled. So, it should reliably detect both salt water and fresh water immersion.
Oh, just for information - resistance in fresh water is in order of 100-200kOhms with current probe configuration, did not try (yet) with salt water. According to general data, it can be ~100 times lower, therefore in order of 1-2kOhm.
- Deni
