AWG 64 MB MEMORY CARD FOR WII Specifikace stáhnout pdf (Strana 29)

TEAM Climate Monitoring Protocol 3.0

5.5.1 Vaisala HMP45C Temperature/RH sensor

Two HMP45C are housed inside a MetOne Aspirated Radiation Shield. (076B). Follow these

steps to mount the shield and the sensors inside it.

Quick description of the radiation shield: The shield consists of two main components: 1) a

large umbrella-like roof that contains the fan and 2) a lower tube that is attached through four

clamps to the upper portion and houses the sensors. The fan at the top draws air from the bottom

of the tube at high speed which is funneled through the sides of an inner tube containing the

sensors. This air cools down the walls of the shield, minimizing the effects of direct solar

radiation on air temperature, which can be important on days with high solar radiation and little

or no wind. The bottom part of the shield (tube) can be easily detached to install/inspect the

sensors.

Connecting the sensor cables: The shield is designed to connect the sensor cables directly into

a wiring box on the top of the tube (the J-Box in the instructions of the shield). Unscrew the top

of the cabling box to expose the connectors. The cabling box contains room for 10 cables (there

are 12 slots but only 10 are wired), which is enough to connect two Vaisala Temperature/RH

sensors. Follow the diagram in Figure 10 to connect the sensor cables to the shield cabling box.

Figure 10. Cabling diagram showing 1) how to connect the cables coming from the Vaisala sensors to the

cabling box inside the aspirated radiation shield; ground cables can be combined into one slot (e.g. black &

white into slot 3) and 2) cabling the whole system into the CR 1000 data logger.

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AWG 64 MB MEMORY CARD FOR WII Specifikace Strana 29