AWG 64 MB MEMORY CARD FOR WII Specifikace Strana 8

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TEAM Climate Monitoring Protocol 3.0
8
3.3.1 Temperature – Relative Humidity Sensor Vaisala HMP45C
The TEAM Climate Protocol uses the Vaisala HMP45C which measures both relative humidity
(%) and air temperature (ºC). The sensor is housed in a radiation shield to avoid the
measurements being affected by solar loading. The shield type used for this sensor is an aspirated
radiation shield (MetOne 076B-5), which stabilizes the readings by allowing air to move past the
sensor. Two temperature/RH sensors are housed in the aspirated radiation shield.
3.3.2 Precipitation Gage – TB4
The use of an automatic but sensitive precipitation gage with low error in recording intense
rainfall events (very common in tropical areas) is essential. The TB4 rain gage (Hydrological
Services Pty. Ltd) funnels rain into a tipping bucket mechanism that tips when 0.25 mm of rain
has been collected. Each tip is marked by a dual reed switch closure that is recorded by the data
logger. After measurement, the water drains through two orifices in the base, allowing the
measured water to be collected in a separate container if desired.
The rain gage includes a siphoning mechanism that allows the rain to flow at a steady rate to the
tipping bucket mechanism regardless of rainfall intensity which reduces typical rain bucket
errors, enabling the gage to record intense rainfall events. As a backup, we recommend installing
a regular precipitation gage (US) to double check heavy precipitation events (>50 mm/hour).
Both precipitation gages should be mounted at least 6 m from the main climate station tower and
at least 30 cm above the ground (see section5.5.3).
3.3.3 Solar radiation – Licor Pyranometer LI200X
This is a silicon-photovoltaic pyranometer that measures global solar radiation (both direct and
diffuse radiation). Although less sensitive than the most sophisticated termophile pyranometers,
the Licor LI200X has medium stability (± 2% per year) and acceptable accuracy (3%-5%) for
baseline measurements. The LI200X should be mounted in an area with near complete view of
the sky (no obstacles 5 degrees above the horizon), which in many cases might require it to be
installed in a separate location from the rest of the sensors (see section 4 below). Sensors are
mounted in duplicate (one facing north and one facing south) to account for seasonal movements
in the solar path (and as backup)(see section 5.5.2 for more details)
3.4 Power supply
The sensors and the data logger are powered by a combination of an energy source (a solar
panel), which charges a 12 V rechargeable battery through a charger regulator. The
recommended solar panel (85 W, 2.24 A, Yinglu) can be mounted to the side of the UT10 (see
section 5.4 for details). The solar panel provides power to a 12V DC-100 Ah rechargeable
battery (UB-121000, Universal Power Group) to ensure proper functioning of the system at night
and during cloudy days. The battery is connected to the solar panel through a charge regulator
(Morningstar Sun Saver – 10 A). The regulator controls the current flowing to the battery and
prevents the battery current from flowing to the solar panel at night.
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