If you dont mind me answering in english, i think i may help you.
Consider Boyle-Mariotte: (P1 x V1)/T1 = (P2 x V2)/T2.
P= pressure (ata)
T= temperature (K!)
V= volume (or flow)
Your flowmeter has been calibrated at fixed circonstances: temperature and pressure at calibration should be found on the apparatous or in the manual.
So if you know the press. and temp. at calibration circonstances (say P1 and T1), then you're capable of calculating the correction factor for your measured value.