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2.4 Basic Equipment Description

In order to be an adequate tool for monitoring climate, the sensors and equipment used in the

Climate Protocol must comply with minimum standards of quality and accuracy required by

other standard climate monitoring efforts (e.g. United States Climate Reference Network at the

National Oceanic Atmospheric Administration). The following section describes briefly each of

the components required to implement the TEAM Climate Protocol. A list of the equipment

with providers and model numbers can be found on Appendix A.1. The range, resolution,

required uncertainty and other technical specifications for the variables measured in the TEAM

Climate Protocol are summarized in Table 22 on page 8.

Data logger – Campbell Scientific CR1000

The data logger receives all the information from the sensors and organizes the data that can be

exported later to a computer, memory card or broadcasted through a radio signal or network. The

protocol requires a data logger that can accommodate a wide array of sensors, is expandable, is

fully programmable, has network communication capabilities, and is rugged for the conditions

encountered at tropical forest sites. An adequate data logger that fits these specifications is the

Campbell Scientific CR1000. More detailed information on how to setup, program, maintain and

retrieve data from the CR1000 is found in later sections of this document.

Sensors

The sensors are the instruments that make the actual measurements of given climatic variables.

Suitable sensors accurately translate environmental change into measurable electrical properties

by outputting a voltage, changing resistance, outputting pulses, or changing states. The data

logger receives this information and transforms it into the measurement of the variable in a

suitable unit (e.g. ºC, mm). The protocol uses sensors to measure four climatic variables: Air

Temperature (in duplicate), Relative Humidity (in duplicate), Precipitation and Global Solar

Radiation (in duplicate). The sensors used in the TEAM Climate Protocol are described below in

more detail.

Temperature/Relative Humidity Sensor – Vaisala HMP45C-L

The TEAM Climate Protocol uses the Vaisala HMP45C-L 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 a passive

radiation shield (41003-5). Two temperature/RH sensors are housed in the aspirated radiation

shield.

Precipitation Gauge – Hydrological Services TB4MM-L

The use of an automatic but sensitive precipitation gauge with low error in recording intense

rainfall events (very common in tropical areas) is essential. The Hydrological Services TB4MM-

L rain gauge 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.

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Campbell CM10K Spezifikationen Seite 7