Hi Shehzad,
A correction in my last comment.Please ignore that.
The ADuCM350 needs a minimum series resistance of 100 ohm to maintain IN-AMP stability.Hence,you can not measure 30 Ohms alone with ADuCM350. You need to have 100 ohm series resistance along with sensor resistance(Z).The sensor resistance(Z) can be less than 1 Ohm .Please refer to the AFE Measurement range FAQ for more details:ADuCM350 FAQ AFE Measurement Circuit Impedance Range
With this in your configuration ,you can select RTIA accordingly and use as RTIA will be more than 100 ohms.
Thanks
Balaji