Automatic Weather Station with UT20/UT30 Tower
2-4
4.
Attach the mounting arm and pyranometer to the top mast assembly with the
universal mounting bracket, as shown in Figure 2-6. Orient the arm to face
approximately south relative to the tower to minimise the possibility of any part
of the structure or other instruments casting a shadow onto the pyranometer.
5.
Make final adjustments for level and orientation, and fully secure the
pyranometer to the arm, and the arm to the mast.
6.
Slide the whole top tower section into place on the main tower, and secure with
the bolts supplied (see Figure 2-3). This will need to be done with extreme care
in order to avoid altering the alignment and levelling of the pyranometer.
7.
The windset should now be fitted to the top mast assembly, before the tower is
raised, as outlined in the following section.
Figure 2-3 Attaching the Top Tower Section
If you are not mounting the pyranometer on the top mast assembly as
described above, you should mount the arm to face approximately
south relative to the tower and always bear in mind, and attempt to
minimise, any possible shading effects of the structure on the
pyranometer. See Section 2.6.
2.3.2 Fitting the 011E Mounting Arm and Vector Instruments
Wind Speed/Direction Sensors
The 011E cross-arm sensor mount is supplied with a special tri-clamp connector
and is attached to the tower top mast assembly, above the pyranometer (if fitted).
See Figure 2-6, below.
As it is essential that the windset is set up and mounted as accurately as possible, it
must be attached to the tower mast assembly and aligned while the tower is lying
flat along the ground. The procedure outlined below must be followed exactly to
ensure that your windset will provide accurate and reliable readings.
1.
Assemble the windset components on their mounting arm and lightly secure.
2.
Ensure that the tower structure is lying flat along the ground in an
approximately horizontal position. You may need to pack the structure to
achieve this.
NOTE
Top Mast Section
complete with
pyranometer etc.
