Campbell Scientific HMP60 HMP60 Temperature and Relative Humidity Probe - 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 usersupplied pipe with a 1.0-in. to 2.1-in. outer diameter. 10