Impedance to voltage range
Your circuit has 7 resistors and produces a nonlinear response of voltage with respect to resistance. 

Here is a circuit with only 5 resistors that can operate from a single 5.0V supply (using a rail-to-rail input* and rail-to-rail output op-amp) and which produces a linear voltage proportional to resistance. 







simulate this circuit &ndash; Schematic created using CircuitLab

The variable resistance sees a constant current of 39.78uA. 

To synthesize this circuit for other ranges, pick R1, R2 to something reasonable
considering the op-amp input bias current, accuracy required, and current capability
of the variable resistor, and overall consumption. 

Pick R4 to maintain a constant current. 

Pick R5 and R6 to make the output voltage correct at minimum and maximum resistance. 

As simple as that! (some algebra omitted, but it's straightforward)

* actually the input range is only 0.87 to 1.59V so many R-R output op-amps will work.