Campbell Scientific CM6/CM10 Tripod Weather Station Installation - Manual (Page 57)

Section 4. Sensor Installation
4.16 CS210 Enclosure Humidity Sensor
Mount the CS210 inside the environmental enclosure or onto a datalogger
using the mounting block and the wire tie included with the sensor (Figure
4.16-1).
The black outer jacket of the cable is Santoprene ® rubber. This
compound was chosen for its resistance to temperature extremes,
moisture, and UV degradation. However, this jacket will
support combustion in air. It is rated as slow burning when
tested according to U.L. 94 H.B. and will pass FMVSS302.
Local fire codes may preclude its use inside buildings.
NOTE
FIGURE 4.16-1. CS210 Installed on a CR1000
4.17 Wind Direction Sensor Orientation
4.17.1 Determining True North and Sensor Orientation
Orientation of the wind direction sensor is done after the datalogger has been
programmed, and the location of True North has been determined. True North is
usually found by reading a magnetic compass and applying the correction for
magnetic declination*; where magnetic declination is the number of degrees
between True North and Magnetic North. Magnetic declination for a specific site
can be obtained from a USFA map, local airport, or through the National
Geophysical Data Web site at:
www.ngdc.noaa.gov/geomag . A general map
showing magnetic declination for the contiguous United States is shown in Figure
4.17-1.
Declination angles east of True North are considered negative, and are subtracted
from 0 degrees to get True North as shown Figure 4.17-2. Declination angles
west of True North are con-sidered positive, and are added to 0 degrees to get
True North as shown in Figure 4.17-3. For example, the declination for Logan,
Utah is 16
° East. True North is 360° - 16°, or 344° as read on a compass.
Orientation is most easily done with two people, one to aim and adjust the
sensor, while the other observes the wind direction displayed by the
datalogger.
4-17