I need help in designing/choosing a simple amplifier.

I have a humidity sensor which supplies .8 to 3.9 Vdc as a measurement of %
RH (.8 = 0% RH - 3.9 = 100% RH). The current range is 20 uA to 100 uA.

I assume I'll need to amplify the output since I am looking to collect the
data from multiple devices into one data logger.

I am hoping to run the humidity sensor and the amplifier off of one 9v
battery. The humidity sensor draws 200u amps at 5v dc.


TIA

Jim