Hi Fausto,
Yes you are correct it should be using differential analog input.
I'm using our internal sensors which I do not want to post information on a public forum. Resolution of orange line is 12 bit with a full scale of 200 psi. It has some input protections. Blue line is Prosense EPS25-1450 psiprosenseeps1001dps.pdf. Sense resistors are just some 0.5% through hole resistors that were selected based on the output. What are you looking for specifically?
The blue line sensor has a PNP switch that commands a solenoid which either vents or pressurizes the manifold. The grey line indicates the change of state of the solenoid. The solenoid circuit has a flyback diode and a voltage divider to allow the DAQ to measure (grey vertical line). Sensors are parallel and connected to negative of the power supply. Solenoid negative is on the same line. Solenoid ground is connected to power bar.
Laptop uses an external power supply that is connected to the same power bar.
Thanks,
-Greg
Series2200_0.pdf