CPEC310
CPEC310
OrderableExpandable Closed-Path Eddy-Covariance System with EC155, Pump Module, and Automatic Zero and Span
Pricing
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Configuration
- w/VOLT116, w/Keyboard/Display, w/CSAT3A Harsh, w/Sonic Carrying Case45299-6NA-AM-KD-SS2-SC-GC
- w/VOLT116, No Keyboard/Display, w/CSAT3A Harsh, w/Sonic Carrying Case45299-6NA-AM-NK-SS2-SC-GC
- w/o VOLT116, w/Keyboard/Display, w/CSAT3A Harsh, w/Sonic Carrying Case45299-6NA-NAM-KD-SS2-SC-GC
- w/o VOLT116, No Keyboard/Display, No Sonic Sensor, No Sonic Case45299-6NA-NAM-NK-NS-NC-GC
- w/o VOLT116, No Keyboard/Display, w/CSAT3A Harsh, w/Sonic Carrying Case45299-6NA-NAM-NK-SS2-SC-GC
Select a configuration to add to your quote
- Model:
- CPEC310
- Item Number:
- 45299
- Warranty:
- 1 year
Overview
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 Granite™ Volt 116 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.
Key Advantages
Provides additional ports with automatic zero and span
Technical 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.
CPEC310 System Enclosure
The CPEC310 has two enclosures: a fiberglass enclosure that houses the CR6 datalogger, pump module, three-valve module, and optional Granite Volt 116 , and the EC100 enclosure for data processing. The CPEC310 can also be equipped with a scrub module for automatic zeroing of the EC155.
CPEC310 Pump Module
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.
Benefits
- New conformal coating helps protect sonic transducers in corrosive environments
- Expandable, high-end system with CR6 datalogger processing power and EasyFlux DL software to compute and fully correct up to 20 Hz data
- The three-valve module makes the CPEC310 the only closed-path eddy covariance system on the market with the ability to perform automatic zero and CO<sub>2</sub>/H<sub>2</sub>O span
- Additional port options for energy balance and atmospheric sensors
- Ideal system for short or tall towers
- Simple design provides easy use while maintaining full functionality
Specifications
- Operating Temperature Range
- -30° to +50°C
- Input Voltage Range
- 10.5 to 16.0 Vdc
- Power
- 12 W
(typical)
35 W(maximum, at cold startup)
System Enclosure
- Dimensions
- 54 x 44.5 x 29.7 cm
(21.3 x 17.5 x 11.7 in.)
- Weight
- 15.36 kg
(33.85 lb)
16.24 kg(35.8 lb) with optional Granite Volt 116 module
Pump Module
- 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 8 LPM)
Three-Valve Module
- Inlets for Module
- Zero, CO2, and H2O span
- Outlets
- Analyzer and H2O bypass
- Connections
- ¼-in. Swagelok
- 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)
Scrub Module
- Power
- 0 W
(quiescent)
2 W(with pump running)
8 W(with heater running)
- 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)
Accessories
(12)CABLEPCBL
2-Conductor 16 AWG Power Cable
OrderableCABLE4CBL
4-Conductor 22 AWG Cable with Drain
Orderable45309
CPEC200/300 Pump Tubing Assembly, 0.375 OD
Orderable21823
Calibration Gas Tubing Assembly
Orderable21823
Calibration Gas Tubing Assembly
OrderableEasyFlux DL
Eddy-Covariance Data Logger Program
Orderable44301
Scrub Module for CPEC200/310
Orderable27158
2 GB microSD Flash SLC Memory Card
Orderable38476
16 GB microSD Flash aMLC Memory Card
Orderable45308
CPEC200/300 Pump Tubing Assembly, 0.500 OD
OrderableEasyFlux PC
Eddy-Covariance Post-Processing PC Software
OrderableFluoreSens 10
Sun-Induced Chlorophyll Fluorescence (SIF) System
Orderable
Common Accessories
(8)44301
Scrub Module for CPEC200/310
The 44301 is used to provide a source of zero air (air that contains no CO2 or H2O) to the CPEC310 for zeroing the EC155 gas analyzer. More often, a compressed-gas cylinder of zero air is used for this purpose; however, the CPEC310 scrub module may be preferable in locations where acquiring and replacing gas cylinders is not convenient.
OrderableCABLEPCBL
2-Conductor 16 AWG Power Cable
The CABLEPCBL is a 16 AWG, two-conductor cable with a Santoprene jacket. The conductors are stripped and tinned. This generic cable is used to power remote peripherals.
OrderableCABLE4CBL
4-Conductor 22 AWG Cable with Drain
The CABLE4CBL is a 22-AWG, four-conductor cable with a Santoprene jacket and an aluminum Mylar shield. It is used for SDM communication. The conductors are stripped and tinned and have red, black, green, and white insulation colors.
Orderable45309
CPEC200/300 Pump Tubing Assembly, 0.375 OD
The 45309is one option for the pump module. The 45309 is a pre-swaged 3/8 in. OD pump tubing assembly used for connecting the EC155 CO2/H2O Closed-Path Gas Analyzer to the pump module with a recommended maximum distance of 50 ft. For distances longer than 50 ft between the EC155 and the pump module (up to 500 ft), Campbell Scientific recommends using a larger ½ in. OD tubing assembly (45308).
Orderable45308
CPEC200/300 Pump Tubing Assembly, 0.500 OD
The 45308 is one option for the pump module. The 45308 is a pre-swaged ½ in. OD pump tubing assembly used for connecting the EC155 CO2/H2O Closed-Path Gas Analyzer to the pump module with a recommended distance of 50 to 500 ft. For distances shorter than 50 ft between the EC155 and the pump module, Campbell Scientific recommends using a smaller 3/8 in. tubing assembly (45309).
Orderable21823
Calibration Gas Tubing Assembly
Campbell Scientific recommends using one 21823 with the system. The Tee Connection option is not needed. The 21823 provides a calibration gas tubing assembly.
Orderable27158
2 GB microSD Flash SLC Memory Card
Campbell Scientific recommends using at least one microSD card with the system, and the 27158 is one option. The 27158 is a 2 GB microSD flash-memory card designed for use in harsh conditions often presented by environmental and industrial applications.
Orderable38476
16 GB microSD Flash aMLC Memory Card
Campbell Scientific recommends using at least one microSD card with the system, and the 38476 is one option. The 38476 is a 16 GB microSD flash-memory card designed for use in harsh conditions often presented by environmental and industrial applications in which customers require higher reliability, endurance, and performance but also seek a cost-effective solution to meet budget-planning requirements.
Orderable
Other Accessories
(4)44299
Replacement Sonic Head for CSAT3A
This sonic anemometer head is similar to the sensor head from the CSAT3 sonic anemometer, but its cable is modified to connect to the EC100 electronics.
OrderableEasyFlux PC
Eddy-Covariance Post-Processing PC Software
EasyFlux™ PC is a free computer program that processes high frequency time series data, collected using a Campbell Scientific eddy-covariance flux system, into fluxes following community accepted practices. Fully corrected fluxes of CO2, latent heat (H2O), sensible heat, and momentum are available, in generic, AmeriFlux, and GHG-Europe ASCII formats.
OrderableEasyFlux DL
Eddy-Covariance Data Logger Program
EasyFlux™ DL is a free CRBasic program that enables a datalogger to report fully corrected fluxes of CO2, latent heat (H2O), sensible heat, and momentum from a Campbell Scientific open-path eddy-covariance (EC) system. Final fluxes are processed from raw high frequency time series data by applying commonly used corrections found in scientific literature.
OrderableFluoreSens 10
Sun-Induced Chlorophyll Fluorescence (SIF) System
The FluoreSens™10 offers a direct sun-induced chlorophyll fluorescence (SIF) measurement that can provide accurate estimates of gross primary production (GPP) and ecosystem respiration (RECO)—the two largest biospheric carbon sources. This system can be used as a stand-alone system, or it can be paired with an eddy-covariance (EC) station. Additional applications include ground truth for satellite SIF measurements, crop and vegetative early stress detection and warning, and drought or fire risk monitoring.
Orderable
Replacement Parts
(27)44299
Replacement Sonic Head for CSAT3A
This sonic anemometer head is similar to the sensor head from the CSAT3 sonic anemometer, but its cable is modified to connect to the EC100 electronics.
Orderable33384
EC155 Replacement Molecular Sieve Bottles
The 33384 contains two desiccant/scrubber bottles utilizing a non-hazardous molecular sieve. Each bottle contains necessary chemicals and membrane filters for scrubbing CO2 and water vapor from the gas analyzer housing. Empty chemical bottles should be disposed of according to local and federal regulations. SDS (Safety Data Sheet) forms for the chemicals are included in the EC155 manual.
Orderable28902
Spare Sonic Wicks Kit
The Spare Sonic Wicks Kit includes three upper transducer wicks, three lower transducer wicks, and a wick-installation tool.
Orderable42815
Four-Unit Desiccant Bags (quantity of 10)
The 42815 includes 10 large, four-unit desiccant bags, used to absorb humidity within enclosures. Multiple packs are recommended for customers who need to desiccate multiple enclosures or systems.
Orderable28878
Replacement Enclosure Humidity Indicator Card
The 28878 is a replacement humidity indicator card. It provides a visual reference of humidity level inside the enclosure.
Orderable30028
Replacement Lithium Battery
The 30028 fits inside a CR6-series datalogger. This lithium battery powers the clock and SRAM when external battery power, a charging source, or a USB power source is not connected. The 30028 is a 3.6 Vdc, 2.4 Ah, AA size cell. The 30028 needs to be periodically replaced.
Orderable8125
Flat-Bladed Screwdriver, 2.5 mm Blade x 50 mm Shaft
The 8125 is a small, flat-bladed screwdriver that is extremely useful for opening the guillotine terminals on our dataloggers and measurement control devices.
Orderable26563
USB Data Cable, Type A Pin (Male) to IP68 Panel Type Mini-B Pin (Male), 4.5 m
The 26563 cable is 4.5 m long. It may be purchased to replace a lost or damaged cable for EC100s that have a plastic USB connector. If the EC100 has a metal USB connector, order the 30179 replacement cable instead.
Orderable30179
USB Data Cable, Type A Male to Type Mini-B Male, IP68, 5 m
The 30179 cable is 6 ft long. It may be purchased to replace a lost or damaged cable for EC100s that have a metal USB connector. If the EC100 has a plastic USB connector, order the 26563 replacement cable instead.
Orderable27555
USB 2.0 Cable, Type A Pin (Male) to Micro B Pin (Male), 6/6.5 ft
The 27555 is a USB Type A to Micro B, pin (male)-to-pin (male) cable, 6 to 6.5 ft long. It connects devices using the Micro B interface to a USB port on a computer.
Orderable32203
EC155 Replacement Vortex Filter Kit
The 32203 is a replacement in-line filter kit for the EC155 heated vortex. The kit includes a 25 µm filter and new ¼ in. Swagelok® nuts.
Orderable560
Screw #10-32 x .312 Pan Phillips
The 560 screw is used to attach a backplate to the inside of an enclosure.
Orderable33241
Replacement Pump Kit for CPEC200/300 or AP200
The 33241 is the replacement for the CPEC310 pump. As of January 2024, this pump's tachometer has a different reading (two pulses per revolution) than the previous replacement pump (one pulse per revolution) and requires a program update to output the correct calculated sample flow rate. Please contact Campbell Scientific for assistance on code modifications.
Orderable27153
EC155 Replacement Carrying Case with Foam Insert
The 27153 replaces a damaged EC155 carrying case and includes a foam insert. The carrying case may also be ordered as a separate item if it wasn't ordered initially with the EC155.
Orderable31461
CSAT3A Replacement Carrying Case with Foam Insert
The 31461 facilitates transporting the CSAT3A from site to site. The 31461 is offered as a replacement item for customers who do not have the foam that originally shipped with the CSAT3A.
Orderable33434
CSAT3A Replacement Carrying Case without Foam
The 33434 is a carrying case without foam inserts that facilitates transporting the CSAT3A. The 33434 is intended for customers who already have foam inserts that were shipped with their CSAT3A.
Orderable27559
CPEC310 or CPEC200 3-Valve Module
The optional 27559 three-valve module is housed in the CPEC310 enclosure. It is used to automate zero and CO2 span checks, as well as automatically perform a field zero and field CO2 span on a user-defined interval.
Orderable28640
Replacement CR6 18-Position Universal Terminal
The 28640 universal terminal connector is shipped attached to our CR6-series dataloggers. This lockable connector provides screw terminals for connecting digital or analog sensor or control wires to the CR6.
Orderable25600
Replacement CR6 12-Position Control Terminal
The 25600 control terminal connector is shipped attached to our CR6-series dataloggers. This lockable connector provides screw terminals for connecting digital sensor, general I/O, and control wires to the CR6.
Orderable27651
Replacement CR6 Power Connector
The 27651 power connector is shipped attached to our CR6-series dataloggers. This green, removable connector provides screw terminals for connecting the wires of a 12 V battery and/or a 16 to 32 Vdc charging source, such as a power converter or solar panel, to the CR6.
Orderable32243
EC155 Mounting Platform for New-Style CSAT3A
The 32243 is required to mount the EC155 closed-path gas analyzer and the CSAT3A sonic anemometer head to a mounting structure.
OrderableCM250
Leveling Mounting Kit
The CM250 is a leveling mount kit for attaching the EC155 to a crossarm.
Orderable16005
2.4 GHz 0 dBd Omnidirectional 1/2 Wave Whip Antenna
Note: This replacement part is only applicable to the -WIFI option.
Orderable
The 16005 is a unity gain (0 dBd), 1/2 wave whip, omnidrectional antenna that features an articulating knuckle joint for easy orientation, weatherized jacket for outdoor applications, and internal counterpoise for ground plane independence.27008
EC155 Foam Case Set
The EC155 Foam Case Set is typically ordered as a replacement part for the foam set that came with the original EC155. The foam set is designed to be used in either the EC155 carrying case or a cardboard box. This foam set protects the EC155 and its parts when travelling with the instrument.
Orderable34007
CPEC300-Series Replacement Auxiliary Feed through 2-inch Cap with Screw
This replacement part is for any lost or broken feedthrough cap that comes with the CPEC310. The 34007 includes the cap and a screw to secure the cap to the CPEC310 main enclosure.
Orderable32127
20 x 20 Mesh Screen Disc
he 32127 is a screen that prevents insects (such as mosquitoes or gnats) from entering the vortex intake. This 1.27 cm (0.5 in.) diameter screen disc fits into the inlet of the vortex sample air cleaner. It is held in place with an interference fit and does not require adhesive or fasteners. It may be easily removed by using a needle or similar tool. The screen is made from 316 stainless steel.
Orderable31693
Heated Vortex Intake for the EC155
The EC155 Heated Vortex Intake is designed to separate particulates from the sample flow and reduce condensation. This newer vortex intake replaces the old vortex intake design that was susceptible to cracking near the intake. While the cracking on old vortex intakes is just cosmetic and does not affect measurements, users may want to replace their old intake with this new one.
Orderable
Note: EC155 units that were shipped after March 29, 2018, have the new vortex intake already. The 31693 is intended for customers with an older EC155 unit.
Services
(3)27332
EC155, CPEC200, and CPEC3XX Calibration with Zero and Span
The 27332 provides a recalibration with zero and span. When drift between zero and span checks seems unstable, or when diagnostic output indicates a problem, the instrument should be sent in for a full factory calibration with zero and span. An RMA is required.
Orderable27333
EC155, CPEC200, and CPEC3XX Zero and Span
The 27333 allows customers to send their EC155 or CPEC310 to Campbell Scientific and have Campbell Scientific perform a zero and span; an RMA (Return Material Authorization) is required. The zero and span should be done when ambient conditions change significantly (i.e., seasonally).
Orderable38944
Gas Analyzer Inspection, Diagnosis, and Evaluation
The 38944 service is for Campbell Scientific gas analyzers (EC150, EC155, and IRGASON) that are sent in for repair service, but, after diagnosis, it is determined that the analyzer cannot be repaired or calibrated, or repair is not required. This service fee covers the required analyzer testing for the evaluation.
Orderable
Need Something Not Listed?
(45299)Don't see what you need from among these options? Download the complete configuration list below.
View all product configurationsShips With
(10)27008
EC155 Foam Case Set
Orderable32243
EC155 Mounting Platform for New-Style CSAT3A
OrderableCM250
Leveling Mounting Kit
Orderable8125
Flat-Bladed Screwdriver, 2.5 mm Blade x 50 mm Shaft
Orderable30179
USB Data Cable, Type A Male to Type Mini-B Male, IP68, 5 m
Orderable27555
USB 2.0 Cable, Type A Pin (Male) to Micro B Pin (Male), 6/6.5 ft
Orderable16005
2.4 GHz 0 dBd Omnidirectional 1/2 Wave Whip Antenna
Orderable- EC155 Certificate of Conformance
- 34054 CPEC310 Quick Deployment Guide
- EC155 Packing Information Sheet
Similar Products
(5)CPEC306
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OrderableIRGASON
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OrderableEC150
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OrderableEC155
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OrderableAP200
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Orderable
Related Resources
Case Studies
Documents
- Technical Paper
Molecular Sieve CO2 and H2O Scrubbing Solution
September 2017
View Document - Technical Paper
Eddy Covariance Hardware Troubleshooting — Preparing for a Site Visit
June 2026
View Document - Document
Qingyuan Project Update
December 2019
View Document - Manual
CPEC306/310 Closed-Path Eddy-Covariance Systems
November 2025
View Document
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- CR6 OSv15.0.0Login required
April 17, 2026
OS and FirmwareThis download is for the CR6 datalogger. Execution of this download places the current CR6 Operating System file(.obj) and WiFi, RF45x and RF4xx operating systems (iobj) on your computer. It also updates the CRBasic Editor compiler and support files. Why Update? New features and 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. Watch the Video Tutorial: Sending an OS to a Local Datalogger.
- EC100 OSv8.02Login required
October 14, 2019
OS and FirmwareEC100 Operating System. Watch the Video Tutorial: Updating the EC100 Operating System.
- ECMonv1.6Login required
March 29, 2016
Software ApplicationsEC100-Series Support Software.
- Device Configuration Utilityv2.36Login required
June 22, 2026
Software ApplicationsA 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)
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