Hi,
Please see my answers below.
1) Yes, BMP585 needs to be exposed to external ambient environment in order to make pressure measurement.
2) If you want to use pressure sensor in the enclosure without exposing the sensor to outside, then you can use BMP581. There must be some ventilation hole on your enclosure for BMP581 to make measurements. You may attach a Gore membrane to cover the vent hole on the enclosure.
3) yes, BMP581 or BMP585 needs to be calibrated in the production line after your product is fully assembled to remove the offset.
4) You can refer to https://community.bosch-sensortec.com/t5/Question-and-answers/How-to-calculate-the-altitude-from-the-pressure-sensor-data/qaq-p/5702 for the formula.
Thanks.
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