B) Units "Med/H" And "Uvi - Conrad 64 61 09 Bedienungsanleitung

b) Units "MED/h" and "UVI"

The base station evaluates the readings of the UV sensor included in delivery and it can display this
data in two different units, namely "MED/h" and "UVI". Both units indicate the energy quantity of the
existing UV radiation per area unit.
The level of the values mainly depends on the position of the sun (and therefore also on
the time of the year and the geographical latitude). Naturally, there are also other factors
which play various important roles (atmosphere, weather, sky cover, altitude, reflexion/
scatter on water, sand or snow etc.).
• MED/h
The abbreviation "MED" stands for minimal erythema dose, meaning the lowest does which still
causes a reddening of the skin.
In Central Europe, the value "1 MED" is assigned to the energy quantity, where skin type II shows
signs of reddening of the skin after one hour (about 0.0694 Watts per square meter).
"4 MED/h" means, for example, that skin type II can spend about 15 minutes (1/4 of an hour)
unprotected in the sun, before the skin starts to redden.
• UVI
The abbreviation "UVI" means "UV index". UVI indicates the maximum value of sunburn effective
UV radiation on the ground.
On an unclouded sky the maximum value is reached at midday (take summer time into account!).
The higher the UVI, the higher the risk of sunburn (and the shorter the time until you will get
sunburned).
A UVI with a value of "1" corresponds to about 0.025 Watts per square meter; 1 MED/h therefore
means a UVI value of about 2.8.
Depending on the skin type, different times apply until a sunburn occurs.
Examples for skin type II with untanned skin in Central Europe:
From UVI 8:
UVI 5 to 7:
UVI 2 to 4:
UVI 0 to 1:
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Very high UV exposure, sunburn in under 20 minutes, protective measures
by all means necessary.
High UV exposure, sunburn possible after 20 minutes, protective measures
necessary.
Intermediate UV exposure, sunburn possible after 30 minutes, protective
measures sensible/recommended.
Low UV exposure, sunburn unlikely, no protective measures necessary