Campbell Scientific CPEC200 Closed-Path Eddy-Covariance System - Manual (Page 14)

CPEC200 Closed-Path Eddy-Covariance System
4.1.1.4 CPEC200 Pump Module
The pump module (FIGURE 4-4) uses a small, low-power diaphragm pump to
draw air through the EC155 sample cell. The pumping speed is automatically
controlled to maintain the volumetric flow at the setpoint (3 to 7 LPM). The
pump module is temperature controlled to keep the pump in its operating
temperature range of 0°C to 55°C. The pump module includes a large-capacity
filter to protect the pump from contamination and dampen pressure fluctuations
in the sample cell that are caused by the pump.
FIGURE 4-4. CPEC200 pump module
4.1.2 Optional Components
4.1.2.1 CR3000 Datalogger
The CR3000 datalogger (FIGURE 4-5) is housed in the CPEC200 enclosure.
The CR3000 executes and stores measurements from all sensors. It calculates
online flux measurements, and stores both raw and processed data. Although
the CR3000 is a required component, the CPEC200 can be purchased without
the CR3000. However, the user must supply a CR3000 with the low-profile
base option.
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