At the end of the
Pump Adapter Manual it says:
Fill level sensor (art. no. 41095 only)
Please refer to the manual “mps”. The sensor installed into the pump adapter is a “mps
pressure ∆40“. Install a pressure equalizing membrane into the top of the reservoir.
So select the ∆40 you have highlighted in your image.
EDIT: be sure to instal the
Pressure equalisation membrane mentioned into one of the top ports of the reservoir, or the results will be incorrect.