Low Noise Low Freq. Amp.

Hello,
I need a very very robust voltage amplifier,using on the shelf parts, which must be very immune to noise, since it'll be used in a high power UPS system, amplifying 0-100mV to 0-5V. It's not to be amplifying high freq. voltages so the bandwidth is not important.
Thanx a lot in advance

Your question is vague to the point of being useless!.

You need to provide FAR more detail, preferably with circuits of the two units it's going to connect together (and why?).

But essentially, an opamp set as non-inverting with a gain of 50 may well be all you need?.

What do you mean "robust"? What do you mean by "immune to noise"? Is the power supply noisy? Why not use more filtering?