@Burt_N wrote:
Thank you for your response. Yes, the absolute pressure reading is converted to a pressure altitude, using standard atmospheric calculations. And, yes 😀 I do correct for local altimeter setting.
As I mentioned, initial installation outputs correct altitude (within max 30'), which is then zeroed out in software as a fixed offset. This results in a reading that ALWAYS match the local FAA approved official altimeter setting, located 200m from my location. This is the scenario before the drift occurs.
Once the drift starts creeping in, it is permanent. The drift is always in one direction -- too high pressure (too low altitude reading). Under stress or not, the reading is identical.
This is not an expected behavior in our experience. Our sensors are for example used in several drones, for which we have not observed such persistent offsets. In my opinion, some other leads should be investigated. Is the altitude correction a one-time offset compensation only? If so the offset will change over time based on weather conditions, and should be updated live or frequently enough. If weather compensation is not relevant, is it possible that the harsh conditions are creating some permanent stress in your system(e.g. bending of the PCB)?
@Burt_N wrote:
I am aware of the wording "not for use in safety-critical applications". Should I look for another vendor?
Only you can tell from your usage of the sensor and if you are within the product's terms of use!
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