Comptus A70-DL0, Инструкция по эксплуатации

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INTRODUCTION
The A70 Wind Direction Transmitter monitors
wind direction and produces a electrical output
signal proportional to wind direction (azimuth). The
wind vane is balanced to prevent “parking” should
the mounting not be level. The signal may be moni-
tored by a computer, instrumentation or displayed
on a meter.
The Transmitter converts the information from
the sensor to a 4-20 ma signal proportional to
wind direction.
An external source of excitation in the range of
12 - 24 VDC is required. Both operating power
and output signal are provided by the same wire
pair.
Two wind direction ranges, 0 - 360
o
and 0 -
540
o
are available. The 540
o
range is recom-
mended if a mechanical chart recorder will
record wind direction. This range reduces
transitions from zero to full scale when the wind
is from the North, preventing the entire chart
from being “painted.” The 360
o
range is recom-
mended when wind direction is electronically
recorded. The 360
o
range provides the best
resolution and the least cost. The 540
o
range is
best when abrupt transitions from zero to full
scale are undesirable.
Figure 1
Recorder Trace with Predominate
North Wind
540
o
Scale 360
o
Scale
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N E S W N E S N E S W N
Figure 2
Recorder Trace with Predominate
South Wind
540
o
Scale 360
o
Scale
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N E S W N E S N E S W N