i would like some help to clarify the +- .4kPa absolute accuracy parameter in the MPL3115A2 data sheet: has this accuracy to be intended as an offset error which stays constant over the whole measurement range? I need to measure not an absolute pressure but pressure intervals over time, so, on reading P1 and P2, i wouldn't mind an offset error, as long as it stays constant for both readings, cancelling itself out during the calculations. Conversely, a variable uncertainty (of -.4 to + .4 kPa) on every reading wouldn't be acceptable. So, is the true pressure accuracy for differential readings the +-.05 kPa stated on the data sheet? Is the "pressure absolute accuracy" an offset error, constant over the rated pressure range?
Thanks and best regards,
PS I am aware that other sensor with different ranges/methods may seem to be better suited for this application.