Campbell Scientific HMP60 Temperature and Relative Humidity Probe - Manual (Page 16)

HMP60 Temperature and Relative Humidity Probe
7. Installation
7.1 Siting
Sensors should be located over an open level area at least 9 m (EPA) in
diameter. The surface should be covered by short grass, or where grass does
not grow, the natural earth surface. Sensors should be located at a distance of
at least four times the height of any nearby obstruction, and at least 30 m
(EPA) from large paved areas. Sensors should be protected from thermal
radiation, and adequately ventilated.
Standard measurement heights:
1.5 m (AASC)
1.25 – 2.0 m (WMO)
2.0 m (EPA)
See Section 10 for a list of references that discuss temperature and relative
humidity sensors.
7.2 Mounting and Assembly
Pull off the yellow shipping cap (see Figure 4-1 in Section 4, Quickstart).
The HMP60 must be housed inside a solar radiation shield when used in the
field. The HMP60 is typically housed in the 41303-5A 6-Plate Radiation
Shield (Figures 4-2 and 4-3 in Section 4, Quickstart). The HMP60 is held
within the 41303-5A by a mounting clamp (Figure 4-4 in Section 4,
Quickstart).
This probe may also be housed in a 41003-5 10-plate shield if additional
hardware is used. A 41322 Adapter Plate allows the HMP60 to be mounted in
the lower part of the 41003-5 10-plate shield. Alternatively, a 41381 extension
tube and the 6637 split nut plug can be used to mount the HMP60 in a higher
part of the 41003-5; the #41381 cable is also required.
Both the 41303-5A and the 41003-5 attach to a crossarm, mast, or user-
supplied pipe with a 1.0-in. to 2.1-in. outer diameter.
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