Campbell ET101, Instruction Manual

SECTION 3.  ET INSTRUMENTATION INSTALLATION

3-3

b) After determining the tilt angle,

loosen the two bolts that attach the
mounting bracket to the panel.
Adjust the angle, then tighten the
bolts.  Secure the lead wire to the
mast using wire ties.  Make
electrical connections as described
in 2b above.

3.1.3  AC POWER INSTALLATION

a) The AC power option includes a

120 VAC to 16 VAC.  The
transformer should be mounted
inside a user supplied junction box
according to local electrical codes.
Dangerous electrical accidents may
be avoided by locating the
transformer remotely and burying a
low voltage line to the station.  The
low voltage will carry up to 500 feet
on an 18 AWG power cable.

b) Shut off 110 VAC power at the

main breaker.  Connect the primary
leads of the transformer to 110
VAC following instructions provided
with the transformer.  Connect a
two conductor cable to the
secondary terminals of the
transformer.  Route the cable from
the transformer to the ET Enclosure
according to local electrical codes.

3.1.4  ENCLOSURE INSTALLATION

1.

Mount and ground the ET enclosure on the
ET Tower as shown in Figure 3.1-4.

a) Place the enclosure low on the

tower.  Do not tighten clamps.

b) Install the sensor arm (ET106) or

reduced sensor set as described in
Section 4.

NORTH 

FIGURE 3.1-4.  Mounting and Grounding

the ET Enclosure

c)

Slide the enclosure to the top of the
ET tower.  Position it on the north
side of the tower (northern
hemisphere).  The top of the
enclosure should be flush with the
top of the tower, with the width of
the sensor arm extending above
the tower.  Tighten the clamps until
the enclosure is snug.  Do not over-
tighten since doing so may damage
the tower or enclosure.

d) Carefully mount the lightning rod

and clamp to the top of the ET
Tower.  Clearance between the
clamp and the enclosure is
minimal.  Care should be taken not
to scratch the enclosure or sensor
assembly.  Strip 1 inch of insulation
from the top end of the 12 AWG
green tower ground wire, curl the
end and place the curled end under
the head of one of the lightning rod
clamp bolts.  Tighten the bolt.

e) Strip 1 inch of insulation from each

end of the 9 inch piece of 12 AWG
ground wire.  Insert one end into
the brass ground lug located at the
top back of the enclosure.  Curl the
other end and place under the head
of one of the lightning rod clamp
bolts.  Tighten the bolt.

9-inch

Ground

Wire

Tower

Ground

Wire