Dear Vicent, Thank you for our detailed response. We are going to use the sensors (2 Numbers) in stationary location, where the air velocity will differ. Our Objective is to measure the "Pressure Difference" (So to estimate the air velocity) and our requirement is "10pa difference should be measurable". From your comments and datasheets we are sure that +-10pa relative change shall be measured by BME280. 1) Assume we have two BME280 sensors and they are calibrated (Offset corrected) once per day. 2) What is the "expected error in Pa" between two sensor reads over one full day (There is no change in Pressure and temperature). This data is not availble in the datasheet. I call this as a "Part to Part" variation. correct me if i am wrong. We couldn't use BMP390L as we also want to measure Humidity. Advance thanks and looking forward to hear from you
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We are considering "bme280" Digital humidity and pressure sensor for our application. Need some clarification related to "pressure sensor" performance. 1) In datasheet, relative accuracy stated as 12 Pa. a. Is it a Part to Part variation? b. What is the repeatability of this Sensor over time (say 24 hours) (measured drift / oscillations in pascal, if there is no change in environment)? 2) In end application (0 to 1000 Meter altitude), we need to measure the as close as 10 Pa Pressure difference (Difference from two sensors readout). a. We have a flexibility of doing error cancellation (Read the two sensor values and the difference is marked as offset error which will be used to calibrate the reading). Will this bring the effective error less than 10Pa (peak to peak)? b. If above solution gives 10 Pa (peak to Peak) accuracy, how frequent (24hours once / 48 hours once) we need to do a new error calculation? Your clarification will help us to proceed the design. Looking forward to receive your response ASAP.
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