Gravity: 0-10V 15-Bit ADC Module - i2c connection issue with ras pi 4

https://www.dfrobot.com/product-2917.html

After having bought the DFRobot Gravity for the purpose of connecting it  between my raspberry pi 4 and my graf silentio pump which has a 0-10v connector to read the water level inside the water tank, I wanted to make an api which gives the value (percentage) from how full the tank is, so that I could add it in other home automations. This seems to not work out, as i somehow have problems when i try to read the data from the 0-10v connection.

when trying "i2cdetect -y 1" on the raspberry pi it will show me the right connection (0x48) and i then try to read data from it, but it will not show any data 

do i have to make a1 or a0 to 1 and what do those switches there do exactly? do they enable the inputs or what do they exactly do? 

Would appreciate help!:)