Hi.
Firstly, sorry my bad English. I cannot be expressed as it wanted.
I am using 4 sensors of Honeywell, concretely is a 40PC series (0-15PSI, Vout is 266.6mV/PSI) is compensated and amplified. Previously it had used another model nonamplified, 26PC series.
With 40pc series, I have only needed an a power supply of 5V and a I read the Vout with a datalogger of 10bit. I don´t need more amplification in order to increase the resolution. The system still is in phase of verification
The sensors are this:
I calculate the differential pressure by sofware, but it´s posible reading Vout with a multÃ*meter and to obtain the subtraction between the sensors by means of op amps
I have obtained good resolution, aprox 0.002 mH2O, but since it has commented, the measurement fluctuates enough according to my measures. I have needed to make average of several values. For example:
This is a graph obtained with a normal pump of aquarium, 220V ac. The sensor are in water out of pump.
value of the signal
amplitude of the wave, 10 msec aprox
In this, the sensor are in the water out of WB, the singal has diminished and modified.
In this, is with a mcp350 in water out of pump. With a diferent rotor and motor of pump, the value of the signal diminishes.
Graph or resolution
