Yeah, I screwed up the gain calc. I meant 1K instead of 10K. since you would most likely end up with a 47K instead of a 50K, that would calc out to 48 (close enough to 50 for this app.).Since the OP is looking for a limit, not measuring steps, this should do.Not sure where the idea of bridge in the sensor came from, but i would conceed that a differential or instrumentation amp would better serve in such case, but again, I do not think step accuracy was a criteria in the OP.As far as drift and offset, you are correct, but we going for the quick and dirty here, not great step accurach. it will all settle out within the specified needs of the OP.No, the 386 is NOT an ideal op-amp for this issue/application, but it will serve (as a starting point).