CPEC310 Expandable Closed-Path Eddy-Covariance System with EC155, Pump Module, and Automatic Zero and Span
Fully Expandable Design
Provides additional ports with automatic zero and span
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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 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.

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Benefits and Features

  • 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 CO2/H2O 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

Images

Main enclosure for the CPEC310
CPEC310 plumbing

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.

CPEC310 System Enclosure

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.

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.

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 CDM-A116 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 7 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)

Downloads

EC100 OS v.8.02 (560 KB) 14-10-2019

EC100 Operating System.

Watch the Video Tutorial: Updating the EC100 Operating System.

View Update History

ECMon v.1.6 (10.7 MB) 29-03-2016

EC100-Series Support Software.

Device Configuration Utility v.2.31 (47.0 MB) 18-12-2024

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)

View Update History

EasyFlux DL for CR6CP v.1.08 (132 KB) 13-06-2024

CR6 datalogger program for Campbell closed-path eddy-covariance systems.

View Update History

CSAT3H Heater Controller v.14.2 (46 KB) 02-02-2021

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.

Frequently Asked Questions

Number of FAQs related to CPEC310: 5

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  1. Can the CPEC310 Scrub Module as a source of zero gas be used with the CPEC300 or CPEC306?

    No. A valve module is required to use the Scrub Module. Only the CPEC310 comes with a valve module.

  2. Which countries can the molecular sieve be shipped to?

    The molecular sieve is a non-hazardous material that can be shipped to any country.

  3. Why did Campbell Scientific start using molecular sieve? Does it have the same effect as the previously used chemicals?

    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:

    1. It was a safer alternative than using the previous chemicals.
    2. Increased shipping regulations for the chemicals limited the number of suppliers. 
  4. Can molecular sieve be used in the future to replace bottles for gas analyzers sold before July 2017?

    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.

  5. To prepare the molecular sieve, how many grams are needed per bottle?

    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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