NovaLynx Corporation_____________________________________________________________________________
200-WS-23
Page 7
Oct 2020
6
CALIBRATION
The
200-WS-23 and 200-WS-23S Current Loop Wind Sensors
are pre-calibrated and should require no
adjustment over their lifetime. However, if the cable between the anemometer and the transmitter is
extended beyond 250 feet (75 m), then resistance losses may introduce errors in the wind direction
readings.
A calibration procedure is beyond the scope of this manual. However, for those with the technical
expertise, the board can be adjusted by means of multi-turn potentiometers located on the 4-20 mA
driver circuit board.
Offset
Span
Wind Speed
R-33
R-17
Wind Direction
R-26
R-28
The following table can be used as a guide if it becomes necessary to check the calibration of the
monitoring equipment. Disconnect the 200-WS-23 or 200-WS-23S from the device before doing these
tests.
1.
Use a 4-20 mA signal generator to feed 6 mA into the selected channel on your monitoring
device.
2.
Compare the output of the monitoring equipment to the values in the table.
3.
Switch the signal generator to output 18 mA. Compare the output to the table.
4.
If both readings are higher or lower than in the table by the same amount, the zero offset
parameter in the monitoring equipment needs to be adjusted.
5.
If the readings are off by different amounts, then the slope parameter needs to be adjusted,
and after that it may be necessary to adjust the zero offset also.
mph
m/s
kph
degrees
compass
4.0
0.00
0.00
0.00
0
N
6.0
12.50
6.25
25.00
45
NE
8.0
25.00
12.50
50.00
90
E
10.0
37.50
18.75
75.00
135
SE
12.0
50.00
25.00
100.00
180
S
14.0
62.50
31.25
125.00
225
SW
16.0
75.00
37.50
150.00
270
W
18.0
87.50
43.75
175.00
315
NW
20.0
100.00
50.00
200.00
360
N
Wind Speed
Wind Direction
Loop Current
