I want to use Arduino for monitoring the electrical conductivity of a fluid at two different places in the same container. I follow this link, where the fluid acts as the second resistance of two voltage dividers. The problem is that because I am measuring at two places through e.g. A0 and A1, the electricity used for measuring A0 affects the readings of A1, and viceversa. So for measuring the correct fluid electrical conductivity at A0 I need to manually interrupt the 5V-A1-GND circuit. And that's quite far from my monitoring aims! And I do not want to use two arduinos.
Now I would like to ask you whether there's a way of interrupting and alternating the measurents of A0 and A1 automatically? I.e. a way of interrupting the 5V-A0-GND circuit and the 5V-A1-GND circuit automatically?
Cheers from the kingdom of Denmark