The CPEC310 with EasyFlux® is a turn-key, closed-path eddy-covariance (EC) flux system for long-term monitoring of atmospheric-biosphere exchanges of carbon dioxide, water vapor, heat, and momentum. A complete system consists of a closed-path gas analyzer (EC155 closed-path gas analyzer), sonic anemometer (CSAT3A sonic anemometer), data logger (CR6 datalogger), sample pump, three-valve module that enables automatic zero and CO2 span measurements (manual H2O span), and accommodations for a CDM-A116 analog input expansion module allowing for additional sensors.
The gas analyzer’s patented vortex intake design (United States Patent No. 9,217,692) and small sample cell volume (5.9 mL) provide a much lower flow rate than other closed-path systems while maintaining excellent frequency response (4.3 Hz cutoff frequency). Additionally, this design makes the system virtually maintenance free while still maintaining an ideal frequency response compared to traditional inline filters. Lower flow allows the CPEC310 to have one of the lowest total system power requirements (12 W) of any closed-path eddy covariance system. Campbell Scientific manufactures all components of the CPEC310, including the data logger and EasyFlux® DL software for computing and correcting fluxes, which gives our system the most reliable functionality.
The gas analyzer’s small sample cell volume (5.9 mL) minimizes the sample residence time (50 ms at the system’s nominal flow rate, 7 LPM). This gives excellent frequency response (5.8 Hz half-power bandwidth) with low total system power (12 W).
CO2 and H2O are measured with an EC155 Closed-Path Gas Analyzer. Three-dimensional wind speed and sonic air temperature are measured with a CSAT3A sonic anemometer head.
The CPEC310 has two enclosures: a fiberglass enclosure that houses the CR6 datalogger, pump module, three-valve module, and optional CDM-A116, and the EC100 enclosure for data processing. The CPEC310 can also be equipped with a scrub module for automatic zeroing of the EC155.
The pump module, a standard component of the CPEC310 system, consists of a small dual-head diaphragm pump with a brushless dc motor mounted inside a fiberglass enclosure. An integral cable connects the pump module to the CPEC310 system enclosure, which provides power, temperature measurement and control, pressure measurement, and pumping speed measurement and control.
|Operating Temperature Range||-30° to +50°C|
|Input Voltage Range||10.5 to 16.0 Vdc|
|Dimensions||54 x 44.5 x 29.7 cm (21.3 x 17.5 x 11.7 in.)|
|Inlet Connection||3/8-in. Swagelok|
|Pressure Sensor Range||15 to 115 kPa|
|Pumping Speed||3 to 9 LPM (automatically controlled at the set point, typically 7 LPM)|
|Cable Length||3.0 m (10 ft)|
|Dimensions||35.6 x 29.2 x 13.5 cm (14.0 x 11.5 x 5.3 in.)|
|Weight||5.4 kg (11.8 lb)|
|Inlets for Module||Zero, CO2, and H2O span|
|Outlets||Analyzer and H2O bypass|
|Dimensions||14.0 x 12.7 x 14.0 cm (5.5 x 5.0 x 5.5 in.)|
|Weight||1.5 kg (3.3 lb)|
|Cylinder Volume||480 cm3 each (29.29 in.3 each)|
|Molecular Sieve Size||1.6 to 2.5 mm beads (0.063 to 0.098 in. beads)|
|Enclosure Dimensions||39.4 x 34.3 x 20.3 cm (15.5 x 13.5 x 8.0 in.)|
|Weight||9.6 kg (21.1 lb)|
This download is for the CR6 datalogger. Execution of this download places the Operating System file(.obj) on your computer. It also updates the CRBasic Editor compiler and support files.
Why Update? This OS contains updates to the GOESTable() and GetRecord() instructions and additional bug fixes. With this OS update it is recommended that you also update the Device Configuration Utility to the most recent version so that new datalogger features are available in the utility.
Note: Campbell Scientific always recommends updating operating systems on site if possible. When remote updates are required, it is recommended that you implement the necessary precautions to handle unexpected OS upload complications. All datalogger settings should be retained when updated remotely. If you choose to roll back to a previous operating system, the datalogger settings will be reset to default.
EC100 Operating System.
EC100-Series Support Software.
A software utility used to download operating systems and set up Campbell Scientific hardware. Also will update PakBus Graph and the Network Planner if they have been installed previously by another Campbell Scientific software package.
Supported Operating Systems:
Windows 10, 8.1, 8, and 7 (Both 32 and 64 bit)
CR6 datalogger program for Campbell closed-path eddy-covariance systems.
Note: This version corrects the compile error that the previous version had with the GPS instruction.
Number of FAQs related to CPEC310: 6
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No. A valve module is required to use the Scrub Module. Only the CPEC310 comes with a valve module.
Yes. For more information, refer to the "CPEC200 Scrub Module Installation, Operation and Maintenance" appendix in the CPEC200 Closed-Path Eddy-Covariance System Instruction Manual.
The molecular sieve is a direct replacement for the old magnesium perchlorate bottles. The molecular sieve may be used for any Campbell Scientific analyzer that used the old bottles.
The molecular sieve has been demonstrated here by our engineering department to be effective at removing CO2 and H2O from the air sample. The change was made for two reasons:
The molecular sieve is a non-hazardous material that can be shipped to any country.
The bottles of sieve for drop-in replacement contain the pellets and a membrane on top. The membrane is necessary to keep the pellets contained while allowing gas to pass over the zeolite. The bottle has the same footprint as the old magnesium perchlorate bottles. The amount in each bottle is listed on the bottle. The amount of sieve needed for each analyzer is the following: