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5. Unscrew the 2 screws at the bottom of the radiation shield.
6. Gently pull out the shield.
7. Remove carefully any dirt or insects inside the sensor casing.
Note
The radiation shield comprises different parts inserted one inside another. Two bottom parts are
closed. Do not change their order! Do not let the sensors inside get wet!
• Clean the shield with water and remove any dirt or insects.
• Install all the parts back when they are fully clean and dried.
Cleaning the UV sensor and calibration
8. For the most accurate readings, please use pure water to clean the UV sensor cover lens before
mounting, and then periodically.
9. You can also calibrate the UV sensor and adjust the UV gain factor in the Wi-Fi Setup (AP mode).
The value can be increased or decreased in 0.1 steps. For more information about UV sensor cal-
ibration, see section "UV Sensor calibration".
21 Disposal
Dispose of the packaging materials properly, according to their type, such as paper or card-
board. Contact your local waste-disposal service or environmental authority for information
on the proper disposal.
Do not dispose of electronic devices in the household garbage!
According to the European Directive 2012/19/EU on Waste Electrical and Electronic Equip-
ment and its transposition into national law, used electrical equipment must be collected sep-
arately and recycled in an environmentally sound manner.
Batteries and rechargeable batteries must not be disposed of with household waste. You are
legally obliged to return used batteries and accumulators and can return the batteries after use
either in our sales outlet or in the immediate vicinity (e.g. in the trade or in municipal collection
points) free of charge.
Batteries and accumulators are marked with a crossed-out dustbin and the chemical symbol of
the pollutant, "Cd" stands for cadmium, "Hg" stands for mercury and "Pb" stands for lead.
