DAVIS Vantage Vue Manual

26
UV Dose and Sunburn - Use this plot to estimate the MED dose leading to sunburn. A
person with Type II (Environment Canada) skin type might choose 0.75 MED as the
maximum for the day; in contrast, a person with Type V (Environment Canada) Skin Type
might consider 2.5 MEDs a reasonable dose for the day. NOTE: the Weather Envoy
assumes a Fitzpatrick (Environment Canada) Skin Type of II.
UV Index
Weather Envoy can also record UV Index, an intensity measurement first
defined by Environment Canada and since been adopted by the World
Meteorological Organization. UV Index assigns a number between 0 and 16
to the current UV intensity. The US EPA categorizes the Index values as
shown below. The lower the number, the lower the danger of sunburn. The
Index value published by the U.S. National Weather Service is a forecast of
the next day’s noontime UV intensity. The Index value displayed in Weath-
erLink is the result of a real-time measurement.
TABLE A-3: UV INDEX
Index
Values
Exposure
Category
0 - 2 Minimal
3 - 4 Low
5 - 6 Moderate
7 - 9 High
10+ Very High
UV Dose that Causes Sunburn
All Burn
Some Burn
I
II
III
IV
V
VI
1
2
3
4
Skin Type (Environment Canada)
Skin Phototype (EPA)
UV Dose (MEDs)
12345
6
20 40 60 80 100 120
mJ/cm
2

DAVIS Vantage Vue Specifications

General

Wind Speed Range	2 to 150 mph (3 to 241 km/h)
Rain Collector Resolution	0.01 in (0.2 mm)
Rain Collector Type	Tipping bucket
Update Interval	2.5 seconds
Temperature Accuracy	±1°F (±0.5°C)
Humidity Accuracy	±3%
Wireless Transmission Range	up to 1000 ft (300 m)
Humidity Range	1 to 100% RH
Wind Direction	0 to 360°
Wind Direction Accuracy	±3°
Power Supply	Solar-powered with battery backup
Console Display	LCD with backlight
Power (Console)	3 C batteries or AC adapter
Wind Speed Accuracy	±2 mph (±3 km/h) or ±5%, whichever is greater
Solar Radiation Sensor	Not included
UV Sensor	Not included
Rain Measurement Accuracy	±4% at rates up to 2 in (50 mm) per hour