Patent ID: 9726627
Date: 2017-08-08
CPC Classifications: A61L,C01B,C07C,G01N,G16C

Claim:
1. A fluid analysis system including a sensor, the sensor comprising: a non-conductive housing; first and second operational amplifier, each having an inverting input, a non-inverting input, and an output; an electrode array for interfacing with a fluid sample and mounted in a first face of the non-conductive housing, the electrode array comprising: a switch coupled to the output of the second operational amplifier and comprising a first position and a second position, such that a sense resistor coupled between either (a) the output of the first operational amplifier and the first electrode or (b) the output of the second operational amplifier and the switch; a switching mechanism for (i) connecting the non-inverting input of one of the first operational amplifier and the second operational amplifier to a first voltage source, defining a powered amplifier, and (ii) connecting the non-inverting input of the other of the one of the first operational amplifier and the second operational amplifier to a second voltage source, defining a reference amplifier; and a differential amplifier configured to output an electrical signal corresponding to a current flowing through the sense resistor.