Writing code to measure pressure using pressure transducers

[Argjenta]

I have a program already that measures displacement, and load but I need to add more code for measuring pressure transducers and I am wondering how to calibrate these transducers and how that will be incorporated into the program.

[Ole_H]

I use a high precision pressure source connected to the transducer and measure the voltage output from the transducer. This way I calibrate the whole measurement chain from the transducer to the computer. For a 0-20 bar transducer I read the voltage V0 at 0 bar, P0 and V20 at 20 bar, P20. Then the linear coefficient, pressure to voltage k=(P20-P0)/(V20-V0). I can then calculate the pressure, P from transducer voltage, V by the formula P=P0+k(V-V0). I usually check the linearity of the transducer i steps 0%, 10%, 25% 50% 75%, 90% and 100% of max pressure.