Op Amp is wired like this.
The power is from a 9v battery reading 8.62v (I was using it for temp testing)
The goal was to get a x50 gain. The pressure transducer (PT) has an output of 0-100mV. So the op amp output should be 0-5v (well 5.1v actually). Right now I have a 7.48v reading on the output (labeled UNO). I double checked everything twice (data sheet, online gain calculator, etc.) I was worried about the non-inverting input being too high, so I grounded the non-inverting pin and it still reads 7.48v. Any ideas?
ALSO... That darn pressure transducer has a 4 wire configuration (Excite +, Excite -, Output +, Output -). I called the manufacture to find out if I could share a ground between the excite circuit and the output and they said "Yes this is fine". When I connect the PT to the 9v battery and share the ground, I get a reading of more than 2 volts @ 0psi. The published output range is 0-100mV for 0-100PSI!!! When I do not share the ground and read the output across the output + and -, I get 0.001mV (the correct reading). My question is what to do with the output - when connected to the op amp???
Pressure Transducer Data sheet (422 H2):
A little bit of wiring info...
Thank you for any help.