Tool/software:
We are testing HDC3021 sensors and have come across a situation where a few samples have negative RH offset that cannot be corrected with the rehydration procedure. If we write a positive RH offset the sensor is accurate above the offset value, but it does not return any value below the offset. Is it possible to bring back this low end sensitivity or when an offset is applied is that value the new minimum that the sensor will measure?
Good Morning,
I am comparing the output from these sensors to a dew point sensor in the same system. Here is a plot of the results at the low end. The HDC3021 sensor output is on the y axis and the reference is on the x axis. The three sensor return 0 RH at 1.5% RH and are between 1 and 2 % RH low on the rest of the measurements.
Yes here is the full plot of all test points, I also included the reference line on the plot to get an idea of offset.
Regarding the excel file, that was meant more to just be a quick test on RH response based on temperature to answer your above question. The humidity was likely not uniform throughout the three sensors at the start of the test. By the end it should be uniform. I also did not record a true reference RH measurement, only the ppmv. I can provide a close approximation using the temperature measured at each sensor and assuming 1 atm pressure. Calculated references are attached for each sensor, as well as what the raw output from 103 would have been.
