I've experimented the cups, they bear the heat, and the mixer bowl is from an old coffee machine.
You haven't answered me sir about the two suggestions
This sensor is for 105C, I will use it for the low level and a floating sensor for high level , I will not use this transistor sensor in the tank because at the bottom I have a 220v heater tube so, i will use it in the mixer bowl because is just a plastic and it's isolated from any power source
i have an idea to put 3 level in the mixer bowl each one for one cup, for example, the valve to pour the coffee in the first cup is opened, when the liquid reaches the second level, the valve is turned off and the second cup placed under the valve ...
What do you think?