Two new RECOMs arrived today from element 14 in Sydney, installed them using thin automotive trim double sided tape.
I am willing to bet that someone when laying out the AQ6 PCB forgot to leave adequate ground relief around the ground pins for the RECOM, particularly the one near the I2C socket, it takes a lot of heat to melt the solder on the GND pin for the RECOM a LOT more than what it should take, I know it is a large GND plane but nevertheless, I bet there is no GND relief on those pads, this needs to be rectified in future versions of AQ6 PCB as it already has and will lead to further soldering issues for the RECOM pins, same issue with GND pin on the power connector.
Anyway, my AQ6 is alive and I am back in the beta testing.
Did the first static calibration curves look good, only problem is it is winter here in Australia and down in my basement it is cold, about 6C so after 100 minutes the small insulated food container only got up to 35C which is not hot enough since the places I plan to use this run 45C in the shade. I will do them with the sun warming up the food container tomorrow.
An observation, the 2 new RECOMs seem to me to be running cooler, the old ones when left on the bench switched on for over an hour they got fairly warm, the new ones are running cooler after being switched on for over an hour.