Specifications

Section 4. Sensor Installation
1. Establish a reference point on the horizon for True North.
2. Sighting down the instrument center line, aim the nose cone, or
counterweight at True North. Display the input location for wind direction
using the *6 Mode of the datalogger, or, the Monitor Mode of LoggerNet
with an on-line PC.
3. Loosen the band clamps or set screws that secure the base of the sensor to the
mast or crossarm. While holding the vane position, slowly rotate the sensor
base until the datalogger indicates 0 degrees. Tighten the band clamps or set
screws loosened previously.
4. Engage the orientation ring indexing pin in the notch at the instrument base
(05103, 05106, and 05305 sensors only), and tighten the band clamp on the
orientation ring.
* Other methods employ observations using the North Star or the sun, and
are discussed in the Quality Assurance Handbook for Air Pollution
Measurement Systems, Volume IV - Meteorological Measurements
4
.
Subtract declination from 360° Add declination to 0°
22 E
18 E
16 E
14 E
12 E
10 E
8 E
6 E
4 E
2 E
0
2 W
4 W
6 W
8 W
10 W
14 W
12 W
16 W
18 W
20 W
20 E
FIGURE 4.17-1. Magnetic Declination for the Contiguous United States
4.17.2 National Geophysical Data Center Web Site
This web site facilitates the task of determining magnetic declination for your
weather station. The web site uses longitude and latitude to determine
declination. Customers located in the US can find their site’s longitude and
latitude. For international customers, a link is provided to help them determine
their longitude and latitude.
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