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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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Vaisala HMP60 Handbuch Seite 16