Amplifying milli Volts to Volts
I suggest using a low-Vos op-amp with low input bias current, in a non-inverting configuration. The sensitivity is not well controlled on that type of sensor so you may either wish to add a trimpot or adjust the sensitivity digitally.

Input impedance must be higher than 1M ohm, which is a low bar to achieve. For example, you could use a 12V supply and an OPA189 There are cheaper amplifiers too, but since you have a PLC just about anything will look relatively reasonable.