Hi,
I have bought MPS20N0040D pressure sensor.I want to know
1)which kind of this sensor for injecting the air is correct?

2)according to datasheet we have these specs:

a)it means we have 25mv for 0 kPa and for range from 50mV to 100mV we have 0kpa to 40kpa?(50mv for 0kpa or 25mv?)
b)what is this sensor accuracy? and what is output voltage variation between 0 to 1kpa?

 

The datasheet is not exactly a model of clarity. I suspect the 'bias' voltage is actually an offset error voltage, i.e with zero applied pressure (0kPa) the output voltage should be somewhere in the range +-25mV, rather than the hoped-for 0V. My understanding of the datasheet is that at 40kPa pressure the output voltage could be anywhere in the range 50-100mV. It looks as though absolute accuracy is low, but relative accuracy is better (+-0.3% of full scale is quoted).

 

Hi
Thanks for your explanation and kindness
Actually I have found another pressure sensor with this specs

1)It means that for 0psi I get (.428 to .572)? and what is the voltage step for 0psi to 1psi?
2)In this datasheet what is FS 's value? (it is related to which voltage?)
3)what is this sensor accuracy?(for example can it measure 0ps to 1ps with .1psi step or not)?

Thanks in advance

 

FS = Full Scale. FS pressure = 5psi. FS output = 4.5V (assuming a 5V supply).
So for 0-5 psi in you get 0.5-4.5V out.
The 'span' is the difference between min and max.
Here the span is 4V. At 1psi the output should be 0.5V + 1 * (span/5) = 1.3V ± about 0.1V for the 'zero output' tolerance and overall accuracy.
Presumably you would calibrate your device to determine what the actual 'zero output' figure is? If so you could compensate the output voltage to cancel that source of error, leaving the overall error of ±1.8% of FS.