I have the following sensor:26PCAFG6G
The output of the signal is a differential output from a Wheatstone bridge with 0 - 1 psi, or 0 - 70.3 cmH20 corresponding to 0 - 16.7 mV, I am using AD623AN for the instrumentation amplifier. I apply gain around 49.91, with the resistor of 2k to apply the gain, to fit the measurement scaling to the ADC.
I intend to apply the sensor with this configuration. On one end I will apply pressure with a bag, and the other will be the discharge place of the water. Here is my setup:
However, I haven't got any significant pressure measurement, as when the water flows through, it only provides around 1.2 mV, when I used a multimeter to read the two points of the Wheatstone bridge. I have calibrated my pressure source, and it is measured to around 44 cmH20, which should be sufficient, and the voltage should be more than 1.2 mV. Here is my oscilloscope reading when I applied the gain by 50.
Would like to know if the sensor is used correctly and if someone has an experience with this particular sensor.
The question is, how is it to interface this sensor, and what went wrong?