Campbell ET101, Instruction Manual, Page: 18 / 38

SECTION 3. ET INSTRUMENTATION INSTALLATION
3-2
3.1 ENCLOSURE, DATALOGGER,
POWER SUPPLY
3.1.1 BATTERY OPTION INSTALLATION
a) Alkaline Option: The BPALK
houses 8 "D" cell batteries. Install it
as shown in Figure 3.1-1. Remove
the external circuit board with wire
and connector by loosening the 2
phillips head screws. Discard the
external circuit board. Mount the
BPALK into the enclosure. To
install the battery pack, loosen the
thumb screw and remove the
cover. Insert the battery pack and
plug the battery lead into the
connector labeled "ALK".
INTERNAL BATTERY
MADE IN USA
12V ALKALINE BATTERY PACK
BPALK
Logan, Utah
TEMPORARY BATTERY
FIGURE 3.1-1. Alkaline Power Mounting
and Connections
YUASA
FIGURE 3.1-2. Rechargeable Power
Mounting and Connections
b) Sealed Rechargeable Battery
Option: Install the kit as shown in
Figure 3.1-2. An unregulated solar
panel or 17 to 24 VAC must be
used with the rechargeable battery
at all times. In either case, power is
routed through the Heyco fitting on
the enclosure back and connected
to the CHG ports by depressing
connector levers. Polarity of the
CHG connection does not matter.
Install the rechargeable battery and
plug the battery lead into the
connector labeled “LA”.
3.1.2 SOLAR PANEL INSTALLATION
FIGURE 3.1-3. Solar Panel Mounting
a) Mount the solar panel to the tower
using the mounting brackets as
shown in Figure 3.1-3. Mount the
solar panel to the tower so it faces
south (northern hemisphere).
Position it as high off the ground as
practical, ensuring it cannot
interfere with air flow or sunlight
around the sensors. The solar
panel should be oriented to receive
maximum insolation over the
course of the year. Suggested tilt
angles (referenced to the horizontal
plane) are listed below.
Site Latitude Tilt Angle
0 to 10 degrees 10 degrees
11 to 20 La 5
degrees
21 to 45 La 10
degrees
46 to 65 La 15
degrees
>65 80 degrees
ALK Battery
Connection
LA Battery Connection
Solar Panel or 16 VAC
Power Cable