Specifications

32
TEAM Climate Monitoring Protocol 3.1
 Plastic cable ties
 Two Temperature/RH sensors (HMP45C)
 Aspirated Radiation Shield (076B)
Two HMP45C sensors are housed inside a MetOne Aspirated Radiation Shield. (076B-5). Follow these
steps to mount the shield and the sensors inside it.
Q
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: 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 by 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.
1. C
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In order to connect the sensors to the shield cabling box, the
sensor cables must be shortened so that all of the inner wires are accessible. It is a good idea
to leave enough cable intact so moving a sensor does not cause wires to come loose, but keep
in mind that leaving too much of the cable intact can take up a lot of space and may cause the
shield to malfunction. Try to cut the cable to a length that allows free movement for the
sensors, but won’t interfere with the functioning of the radiation shield (there should be enough
cable left to be coiled into 2-3 small loops).
2. C
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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. If you are using the A
A
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version of the sensors follow
the diagram in Figure 13 on the next page to connect the sensor cables to the shield cabling
box. For those using the E
E
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version refer to Figure 14 on page 33.
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:
:
If the sensor was bought in the United States or Canada, (US version) there is one
extra green wire in the sensor cable bundle. If the sensor was bought in Europe (Europe
version), there is an extra yellow wire instead. These extra wires can be ignored. You can
watch a video of the connecting process called “Connecting the temperature and relative
humidity sensors” on the TEAM portal in the Climate Protocol section
(http://www.teamnetwork.org/en/protocols/climate).