Sampling and processing Question

Im trying to setup an electronic sampling system to monitor the force on a metal bar that supports a heavy sensor. Now I have 3 questions regarding my theory about doing it:

i) easiest way is to use strain gauge, so setting two of them up, both along longitudinal axis, so via push-pull setup would compensate for non-linearity. Is that a good thing to do? Again why and why not.

ii) knowing temperature fluctuations in environment, i chose an op-amp with small temperature drift. Also have a fan in the room where sensor is to keep temperature constant. Is that good thing to do? why or why not?

iii) In control software i would monitor results from strain gauge, and get computer to notify me about an error that has occurred if the output from sensor is outside some "reasonable" result. Is that good thing to do? why or why not?

Thanks.

Hi Carlos,
Please would you give us a diagram of the set up, an idea of the weights and forces involved, the circuit and op-amp you are using, and the overall purpose of the system ? Thanks !

(Allegedly Chinese proverb: A picture is worth a thousand words !")

Have a look at the following

Search key words (easiest way to use a strain gauge)

http://www.ing.unp.edu.ar/electronica/asignaturas/ee016/anexo/r-an078.pdf

here is an image to help show you what the method