I am using an Arduino Nano to read the pressure data from 2 Bar02 sensors. They are connected via an I2C multiplexer TCA9548A and each sensor has an I2C level converter. I have both sensors out of the water and one seems to be working fine and showing a pressure of 1017 mbar. However, the other sensor reads a negative pressure of -14 mbar. The sensor that reads the correct pressure works fine when connected to either of the level converters, which makes me think that the multiplexer and the level converters are working properly. Does this mean that one of the sensors is faulty? If so, what could cause this? The sensor has not been used before.
Thanks for any suggestions.