BME280 Temp & RH accuracy

[simonk]

Hi everyone,

We have designed some kind of a industrial sensor using two of your BME280 sensor on the same board for measurment of ambient and sorrounding contitions. We have made a test batch of more than 100 pcs and compared readings with calibrated sensors.

We are constantly getting to low readings for temperature and relative humidity compared with reference sensors. Deviation is between -0.1 to -0.9°C for temperature and -2 to -4 or even -5% for relative humidity compared to reference sensors. All that at normal room conditions. 

Do you have any idea what is the reason for this? I can provide data excel sheet if needed.

Many thanks for you answer.

[Jet]

Hi Sir:

     The sensor need be done an additional compensation after soldering.

    Please see the following picture, which was captured from End-of-line Offset Calibration AN of BME280.

If you want to get the whole AN , please visit https://www.bosch-sensortec.com/about-us/contact/contact-form, and use the contact form to submit your request.