Comptus A70-DL0, Instruction Manual

Page: 12 / 22

12
OPERATION
Operation of the system is fully automatic and
commences when loop power is supplied.
The wind direction vane has a 8 degree dead
band centered about North. When in the dead
band the output signal will be at its minimum.
360 Degree Wind Direction Scale
The wind direction may be determined from the
output current with the use of Formula # 2
D - Wind Azimuth in Degrees
I - Loop Current in ma
D = (I - 4) X 360/16 Formula #2
Figure 11
Graph of Wind Direction Transfer Function
360
o
Range
0 180 360
4
12
20
L
o
o
p
C
u
rr
en
t
in
m
A
Wind Azimuth
Degrees
N E S W N
540 Degree Wind Direction Scale
The wind direction may be determined from the
output current with the use of Formula # 3
D - Wind Azimuth in Degrees
I - Loop Current in ma
D = (I - 4) X 540/16 Formula 3
Figure 12
Graph of Wind Direction Transfer Function
540
o
Range
N E S W N E S
0 180 360 540
L
o
o
p
C
u
rr
en
t
in
m
A
4
12
20
Wind Azimuth
Degrees
540 Degree Wind Range Conversion
To convert the 540 degree range to a 360 degree
range, subtract 360 degrees from any azimuth
greater than 360 degrees.