Campbell Scientific ET107 Evapotranspiration Monitoring Station - Manual (Page 28)

ET107 Weather Station
2.4 Crossarm and Sensor Installation
Refer to Appendix C.2, Crossarm, for a labeled, exploded view of the
crossarm.
2.4.1 Components
(1) ET107 Crossarm with Sensors (see FIGURE 2-6)
(1) Met One 034B or Gill WindSonic Wind Sensor
(1) White Mounting Shaft for 034B or Gill WindSonic
(1) Gill Radiation Shield
2.4.2 Crossarm Installation
Adjust the bolts at the base of the pole to vertically level the top section of the
mounting pole. Install the ET107 Sensor Arm after the ET Enclosure is
mounted on the ET Tower. You may need to temporarily remove the
communications option. Mount the sensor arm as shown in FIGURE 2-8
without the wind sensor attached.
FIGURE 2-8. ET107 sensor arm mounting
1) Remove the front lid and the protective connector cover from the back of
the ET enclosure by loosening the one Phillips screw at the bottom of the
cover.
2) Place the sensor arm on top of the enclosure, lining up the four threaded
holes on the under side of the arm with the four holes in the top of the
enclosure. Attach the arm to the enclosure by inserting and tightening four
Phillips head screws. Adjust the position of the ET Enclosure so that the
crossarm is oriented along a due north to due south axis with the rain gage
and solar radiation sensor (pyranometer) on the south side for northern
latitudes and the reverse for southern latitudes.
18