Commissioning - Observator Instruments OMC-150 Manual

7

Commissioning

Commissioning procedure
It is impossible to calibrate the OMC-150 anemometer in the field. However, the following procedure
makes sure that the installation was successful.
1) Check the connections
2) Install the interface and (if applicable) the display instrument. Normally the OMC-150 anemometer is
powered through the interface unit.
3) Check the direction readings. A various wind directions, make sure that the change in reading
corresponds to the direction of the vane. For interpretation of the wind direction reading, remind that
the wind direction is defined as the direction where the wind comes from. The readings should be
reasonable
4) Check the wind speed reading. Table 4 can be used for estimation of the actual wind speed. The
reading should be reasonable
Force Speed
knots m/s
[Bft]
0 < 1 <0.2
1 1-3 0.3-1.5 Light air
2 4-6 1.6-3.3 Light breeze
3 7-10 3.4-5.5 Gentle breeze Large wavelets (0.6 m), crests
4 11-16 5.5-7.9 Moderate
5 17-21 8.0-10.7 Fresh breeze
6 22-27 10.8-13.8 Strong breeze Large waves (3 m), probably
7 28-33 13.9-17.1 Near gale
8 34-40 17.2-20.7 Gale
9 41-47 20.8-24.4 Strong gale
10 48-55 24.5-28.4 Storm
11 56-63 28.5-32.6 Violent storm
12 64+ >32.6
Table 4 Beaufort scale
Manual | OMC-150
Status: Final | Not confidential
Name Conditions at sea
Calm Sea like a mirror.
Ripples only.
Small wavelets (0.2 m). Crests
have a glassy appearance.
begin to break.
Small waves (1 m), some
breeze whitecaps.
Moderate waves (1.8 m), many
whitecaps.
some spray.
Mounting sea (4 m) with foam
blown in streaks downwind.
Moderately high waves (5.5
m), crests break into spindrift.
High waves (7 m), dense foam,
visibility affected.
Very high waves (9 m), heavy
sea roll, visibility impaired.
Surface generally white.
Exceptionally high waves (11
m), visibility poor.
Hurricane 14 m waves, air filled with
foam and spray, visibility bad.
Conditions on land
Smoke rises vertically.
Smoke drifts and leaves rustle.
Wind felt on face.
Flags extended, leaves move.
Dust and small branches move.
Small trees begin to sway.
Large branches move, wires
whistle, umbrellas are difficult to
control.
Whole trees in motion,
inconvenience in walking.
Difficult to walk against wind.
Twigs and small branches blown
off trees.
Minor structural damage may
occur (shingles blown off roofs).
Trees uprooted, structural
damage likely.
Widespread damage to
structures.
Severe structural damage to
buildings, wide spread
devastation.
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