October 16, 2021 at 9:05 am
#29074
WolferlModerator
Hi Ken,
Yes, bad power supplies are responsible for most sensor failures. The sensors are indeed of good quality, the wall warts supplied are super cheap.
Do you have access to an oscilloscope to check your power supply?
What levels of ozone does your unit show when you used batteries?
A dose of 30 to 50 ppb is already considered to be harmful to humans.
WHO 2021 global air quality guidelines
Ozone is nothing to do with pollution like nitrogen or carbon oxides.
Concentration can be high on warm and sunny days.
Cheers,
Wolferl