hello all,
I just wanted to update you guys on my problem.
After a long absence from this project, I finally got some time to sit with my problem.

After considering many componants, I have decided to use the INA118 Instrunment amplifire fron TI. This componant has

LOW OFFSET VOLTAGE: 50mV max
LOW DRIFT: 0.5mV/°C max
LOW INPUT BIAS CURRENT: 5nA max
HIGH CMR: 110dB min
INPUTS PROTECTED TO ±40V
WIDE SUPPLY RANGE: ±1.35 to ±18V
LOW QUIESCENT CURRENT: 350mV

My input differential voltage is expected to be in the range of 200mV to 350mV, and I therefore plan to implement this amp with a gain of 10. The problem however arrises when the inputs are across an open cct winding, in this case the full scale supply will be present across the inputs, this will be in the range of 10V to 20V. Considering the gain of 10, a voltage of 100V to 200V should theroticaly appear on the output of the INA118, however the output range will be "clipped" to the +V and -V range.
I therefore plan to use a single +5V supply on order to keep the output in the "safe" range for it to be used as an input to my ADC.

How does this sound? Is this, in your opionion a good soloution or are some of my statements or assumptions incorrect.

Thank you for your time
sun