The CPEC200 is a turn-key, closed-path eddy-covariance (EC) flux system for long-term monitoring of atmosphere-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 (CR3000 datalogger), and sample pump. A valve module is also available for automated zero and span.
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.Read More
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.
A 16 in. by 18 in. fiberglass enclosure houses the data logger, optional data storage peripheral, optional valve module, and the electronics that interface with the CPEC200 pump module. The CPEC200 system enclosure can be mounted to a tripod mast, CM106 tripod leg base, tower legs, or a large diameter pole.
The pump module, a standard component of the CPEC200 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 CPEC200 system enclosure, which provides power, temperature measurement and control, pressure measurement, and pumping speed measurement and control.
Campbell Scientific offers two valve module versions. The basic three-valve module (pn 27559) enables the CPEC200 system to automatically perform zero, CO2 span, and H2O span measurements. The six-valve module (pn 26578) includes three additional valves to allow more CO2 span tanks to be measured. The valve module is housed inside the CPEC200 system enclosure. The outlet of the manifold has a proportional valve to automatically control the flow of zero/span gas.
A scrub module (pn 27423) is available for the CPEC200 which provides a zero air reference source for the CPEC200 without the need for an extra cylinder which can be useful in remote applications. The CPEC200 scrub modules pulls ambient air through three bottles of molecular sieve, effectively scrubbing CO2 and water vapor from ambient air to produce the reference zero. The scrub module and its small diaphragm pump are housed within a weather-tight fiberglass enclosure which is compatible with a variety of mounting options.
|Note: Contact the Campbell Scientific Micromet group for questions or updates regarding the data logger program.|
|Operating Temperature Range||-30° to +50°C|
|Input Voltage Range||10.5 to 16.0 Vdc|
|Dimensions||52.1 x 44.5 x 29.7 cm (20.5 x 17.5 x 11.7 in.)|
|Inlet Connection||3/8-in. Swagelok|
|Pumping Speed||3 to 9 LPM (automatically controlled at the setpoint, typically 7 LPM)|
|Pressure Sensor Range||15 to 115 kPa|
|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) without mounting bracket|
|Inlets for Three-Valve Module||Zero, CO2, span, and H2O span|
|Inlets for Six-Valve Module||Zero, CO2 span 1 to CO2 span 4, 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 of Three-Valve Module||1.5 kg (3.3 lb)|
|Weight of Six-Valve Module||1.9 kg (4.2 lb)|
|Cylinder Volume||480 cm3 each (29.29 in.3)|
|Molecular Sieve Size||1.6 to 2.5 mm 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)|
Execution of this download installs the CR3000 Operating System and Compiler on your computer. It also updates the CR3000 support files for the CRBasic Editor.
Note: The Device Configuration Utility is used to upload the included operating system to the datalogger.
Upgrading from versions prior to version 28 of the Operating System will reset the datalogger’s CPU drive. This is due to a change in the format of the file system from FAT16 to FAT32. In order for the datalogger to operate correctly, as part of the upgrade, the CPU drive is formatted to FAT32. Any programs stored and running from the CPU drive will be lost. It is not recommended to update the datalogger’s Operating System over a remote connection where program control regulates the communication equipment (turning it on or off, etc.). In these cases, an on-site visit and a backup using DevConfig’s backup utility is necessary to update the datalogger’s Operating System.
In all cases where the datalogger is being updated from an Operating System prior to 28, the use of DevConfig’s backup utility is recommended due to the CPU drive being formatted using the new FAT32 format.
Micrometeorology Group (435) 227-9100.
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)
EC100 Operating System.
EC100-Series Support Software.
The CSAT3H Heater Controller ships with this encrypted program. This program is for the unlikely event that the program needs to be re-installed or updated to a newer version. Please contact Campbell Scientific if you have questions about the program or would like the algorithm modified for a specific application.
Number of FAQs related to CPEC200: 16
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There is no heater along the intake pipe of the CPEC200. An air gap insulates the intake pipe (1/8 in. OD) from the outer shell (1/2 in.ID), so the air traveling down the intake tube retains most of the heat absorbed at the intake.
The pump module fan continues to draw 0.7 W while operational.
The heater for the CPEC200 is not positioned along the intake pipe. The heater is in the "snout/rain-cap" of the vortex intake.
Yes, the heater is controlled the same way. Campbell Scientific recommends leaving the heater on all the time.
Yes, the pump works a little harder with the new vortex. The recommended flow for the new vortex system is 8 LPM (6 to sample cell + 2 to bypass). 7 LPM was recommended for the original system. Also, the sample cell “differential” pressure is slightly lower (~-6kPa_new versus ~-3kPa_original). It’s a balance of parameters to maintain good frequency response, low power, and low maintenance.
If the pump fails, it must be replaced. Contact Campbell Scientific for details. For the process of returning equipment to Campbell Scientific, refer to the Repair and Calibration page.
The pump has a one-year warranty. Although the pump’s manufacturer does not specify an expected lifetime, the pump’s lifetime is expected to be significantly longer than one year.
Campbell Scientific recommends Synflex 1300 (pn 15702, Raw Plastic Tubing .250 in. OD). This tubing has a durable polyethylene jacket and an aluminum wrap to limit diffusion through the wall. The aluminum layer also makes this tubing easier to work with, as it does not tend to spring back into a coiled shape as much as other tubing types.