We have had reports that some (but not all) devices with old V1.17 firmware have lost their PAR calibrations when updating to V 2.036 or above. We are looking into this issue, and are testing a fix, which we will release as soon as possible. It is pretty clear, though that once the devices are recalibrated there should be no issues, Meanwhile, if you have a device with V1.17, hold off on updating until the fix arrives.
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Dave, thanks for posting this announcement.
A way for users to test if they have this issue is to take a quick PAR measurement under full sunlight. If your the PAR intensity is greater than 2200 umol/m^2^/s, then your PAR calibration may have been lost as a result of the firmware update.
We have checked our device and calibration is also lost. We don't have the light box readily available to recalibrate the device, are there any other ways? Also, is there a way to go back to V1.17?
Yes, I have a fix for devices like these. I tested it over the weekend on some of our devices, and it seems to work.
However, you will need to update your firmware, which is not a problem, and use the latest Desktop App. I understand that we can send you and IMG for the new Desktop App for macOS, but we are waiting for a security certificate for the Windows version. Hopefully that will come very soon.
All, We have a fix for the PAR calibration issue! Craig tried it and it seemed to work. We will post instructions shortly.
I re-calibrated my devices using a LiCor PAR sensor. It was a good exercise as it helped me understand how these devices work.