sen0257 in a compressed air system

Hello everyone
I bought a sen0257 sensor because the description says it can measure liquids and gases. Since air is also a gas, I installed it and started it up with an Arduino micro. Now it shows me the pressure at very large intervals, about 250 kPa increments. Am I doing something wrong, or is this not possible to read pressure in a compressed air system with this sensor?
The code for reading:
Vpress = analogRead(DruckPin) * 5.00 / 1024;
P = ((Vpress - OffSet) * 2.5);
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