We are going to start a project of a sensor that should be used Capacitance Level Measurement.
The principle of capacitive level measurement is based on the capacitance change of a capacitor.
The probe and the tank wall form a capacitor whose capacitance is dependent on the amount of product in
the tank: an empty tank has a lower, a filled tank a higher capacitance.
Would you recommend the right choice for this project. I mean - ICs and etc.
For this type of application you want to use one of the following devices. AD7745, AD7746, or AD7747 which are capacitive measuring devices. You can do a search for each of those part numbers on the analog.com website, or by using Google.
There are evaluation kits available for these parts as well. (http://www.analog.com/en/analog-to-digital-converters/capacitance-to-digital-converters/ad7746/products/EVAL-AD7746/eb.html , http://www.analog.com/en/analog-to-digital-converters/capacitance-to-digital-converters/ad7747/products/EVAL-AD7747/eb.html )
There is also an application circuit which might be helpful. (www.analog.com/cn0129 )
Hope that helps you get started.