Ventus W155 Handbuch Seite 12

repeatedly to scroll through the current & last 6 days/weeks/months data corresponding to your
selected rainfall mode. On the bar chart display, the "0" represents the current period. –1, –2, etc
indicate the prior periods. The precise rainfall reading of the selected period will be shown on the
display.
Example 1:
In April, press "RAIN HISTORY" repeatedly in the monthly rainfall mode until "–3" bar chart is shown.
The bar chart and reading indicate the monthly rainfall record in January (from 1st Jan to 31st Jan)
Example 2:
On Wednesday, press "RAIN HISTORY" repeatedly in the weekly rainfall mode until "-1" bar chart is
shown. The bar chart and reading indicate the weekly rainfall recorded last week (from last Sunday to
last Saturday).
Example 3:
On Friday, press "RAIN HISTORY" repeatedly in the daily rainfall mode until "–2" bar chart is shown.
The bar chart and reading indicate the daily rainfall record on this Wednesday.
WIND SPEED & DIRECTION
The weather station uses the anemometer to sample the wind speed and direction. You can set the
monitor to display the wind speed in miles per hour (mph), kilometers per hour (km/h), meters per
second (m/s), knots and Beaufort. Press "WIND UNIT" on the back casing until the desired unit
appears.
The monitor displays 16 wind directions (N for north, S for south, SW for south-west and so on).
Press "WIND" to select gust & average wind speed display.
Wind direction:
Average wind speed:
Gust wind speed:
Beaufort Knots
0 Under 1
1 1 – 3
2 4 – 6
3 7 – 10
4 11 – 16
5 17 – 21
6 22 – 27
7 28 – 33
Average wind direction over a 2-minute period
Average wind speed over a 2-minute period
Maximum wind speed over a 10-minute period
Wave height Wave height
(meter) (feet)
- -
0.07 0.25
0.15 – 0.3 0.5 – 1
0.6 – 0.9 2 – 3
1 – 1.5 3.5 – 5
1.8 – 2.4 6 – 8
2.9 – 4 9.5 – 13
4.1 – 5.8 13.5 – 19
WMO description
Clam
Light air
Light breeze
Gentle breeze
Moderate breeze
Fresh breeze
Strong breeze
Near gale breaking waves begins to be blown in
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Effects observed on the sea
Sea is like a mirror
Ripples with appearance of scales;
no foam crests
Small wavelets; crests of glassy
appearance, not breaking
Large wavelets; crests begin to
break; scattered whitecaps
Small waves, becoming longer;
numerous whitecaps
Moderate waves, taking longer form;
many whitecaps; some spray
Larger waves forming; whitecaps
everywhere; more spray
Sea heaps up; white foam from
streaks