Vaisala HUMICAP HMP41 Spécifications télécharger pdf (Page 7)

Model HMP45C Temperature and Relative Humidity Probe

3. Installation

3.1 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 +/- 1.0 m (AASC)

1.25 – 2.0 m (WMO)

2.0 m (EPA)

2.0 m and 10.0 m temperature difference (EPA)

See Section 10 for a list of references that discuss temperature and relative

humidity sensors.

3.2 Assembly and Mounting

Tools Required:

• 1/2” open end wrench

• small screw driver provided with datalogger

• UV resistant cable ties

• small pair of diagonal-cutting pliers

The HMP45C must be housed inside a radiation shield when used in the field.

The 41003-5 Radiation shield has a U-bolt for attaching the shield to tripod

mast / tower leg (Figure 3-1), or CM200 series crossarm (Figure 3-2). The

radiation shield ships with the U-bolt configured for attaching the shield to a

vertical pipe. Move the U-bolt to the other set of holes to attach the shield it to

a crossarm.

Loosen the split-nut on the bottom plate of the 41003-5. Remove the yellow

protective cap on the HMP45C, and insert the sensor into the shield. Tighten

the split-nut to secure the sensor in the shield. Route the sensor cable to the

instrument enclosure. Secure the cable to the tripod/tower using cable ties.

The HMP45C must be housed inside a radiation shield when used in the field.

The 41003-5 Radiation Shield (Figure 3-1 and 3-2) mounts to a tripod mast,

tower leg, or CM200 series crossarm.

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Vaisala HUMICAP HMP41 Spécifications Page 7