Provides additional ports without automatic zero and span
Overview
The CPEC306 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, and accommodations for a CDM-A116 allowing for additional sensors.
The gas analyzer’s intake design and small sample cell volume (5.9 mL) provide excellent frequency response (4.3 Hz cutoff frequency) with low total system power (12 W). Additionally, the vortex intake (United States Patent No. 9,217,692) greatly reduces maintenance and maintains frequency response compared to traditional inline filters.
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Benefits and Features
- New conformal coating helps protect sonic transducers in corrosive environments
- Expandable, mid-level system with CR6 datalogger processing power
- Suitable for sites with many sensors and either a short or tall tower
- Simple design for easier troubleshooting
EasyFlux® DL is a free CRBasic program for Campbell closed-path eddy-covariance systems that is available in the Downloads section. To learn more about EasyFlux® DL, visit the software product's web page.
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Detailed Description
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).
Eddy-Covariance Measurements
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.
CPEC306 System Enclosure
The CPEC306 has two enclosures: a fiberglass enclosure that houses the CR6 datalogger, pump module, and optional CDM-A116, and the EC100 enclosure for data processing.
CPEC306 Pump Module
The pump module, a standard component of the CPEC306 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 CPEC306 system enclosure, which provides power, temperature measurement and control, pressure measurement, and pumping speed measurement and control.
Specifications
| Operating Temperature Range | -30° to +50°C |
| Input Voltage Range | 10.5 to 16.0 Vdc |
| Power |
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System Enclosure |
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| Dimensions | 54 x 44.5 x 29.7 cm (21.3 x 17.5 x 11.7 in.) |
| Weight |
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Pump Module |
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| 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) |
Documents
Brochures
Manuals
Technical Papers
- EC150, IRGASON, or EC155: Which CO2 and H2O Eddy-Covariance System Is Best for My Application?
- Quantifying Frequency Response of a Low-power Closed-path CO2 and H2O Eddy-covariance System
- Damping Temperature Fluctuations in the EC155 Intake Tube
- Replacing the Vortex Intake in an Older EC155
- An eddy-covariance system with an innovative vortex intake for measuring carbon dioxide and water fluxes of ecosystems
Miscellaneous
- Performance Evaluation of an Innovative Sampling System for Closed Path Eddy Covariance Measurements
- Using Molecular Sieve to Zero Infrared Gas Analyzers for Eddy Covariance or Atmospheric Profile Measurements
- Field-Performance Verification of Carbon Dioxide, Water, and Nitrous Oxide Closed-Path Eddy Covariance Systems with Vortex Intakes Poster
Downloads
CR6 OS v.13.02 (8.40 MB) 19-03-2024
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 fixes CRAM-MD5 authentication process within SMTP. 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.
Watch the Video Tutorial: Sending an OS to a Local Datalogger.
EC100 OS v.8.02 (560 KB) 14-10-2019
EC100 Operating System.
Watch the Video Tutorial: Updating the EC100 Operating System.
ECMon v.1.6 (10.7 MB) 29-03-2016
EC100-Series Support Software.
Device Configuration Utility v.2.29 (54 MB) 15-11-2023
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 11 or 10 (Both 32 and 64 bit)
EasyFlux DL for CR6CP v.1.06 (132 KB) 09-11-2023
CR6 datalogger program for Campbell closed-path eddy-covariance systems.
Frequently Asked Questions
Number of FAQs related to CPEC306: 5
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No. A valve module is required to use the Scrub Module. Only the CPEC310 comes with a valve module.
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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.
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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:
- It was a safer alternative than using the previous chemicals.
- Increased shipping regulations for the chemicals limited the number of suppliers.
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The molecular sieve is a non-hazardous material that can be shipped to any country.
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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:
- The EC150 needs 22 g (drop-in bottle).
- The IRGASON® needs 22 g (drop-in bottle).
- The EC155 needs 22 g (drop-in bottle).
- The AP200 needs 500 g (refill).
- The 27423 needs 1000 g (refill).
- The 31022 needs 500 g (refill).
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