Campbell Scientific eosFDCO2 Chamber User Manual PDF

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Summary of Content for Campbell Scientific eosFDCO2 Chamber User Manual PDF

User Manual

eosFDCO2 eosFD Forced Diffusion Chamber and Software

Version 2.4

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This guide is distributed by EOSENSE INC (Eosense'') for users of the eosFD Forced Diffusion chamber instruments in conjunction with the eosLink-FD software. Eosense is not liable for special, indirect, incidental, or consequential damages. Eosense's obligation under this warranty is limited to repairing or replacing (at Eosense's discretion) defective products. The customer shall assume all costs of removing, reinstalling, and shipping defective products to Eosense where applicable. Eosense will return said products by surface carrier prepaid. This warranty is in lieu of all other warranties, expressed or implied.

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Contents

1 Summary

2 Introduction 2.1 What is Forced Diffusion 2.2 How Flux is Calculated 2.3 The Measurement Cycle

3 Quick Start Guide

4 Hardware 4.1 eosFD Housing 4.2 Main Power & Data Cable 4.3 Power Connectors 4.4 Data Cable 4.5 Analog Data

5 Deployment 5.1 Setup 5.2 Maintenance

6 Using eosLink-FD 6.1 Overview 6.2 Installing and Connecting 6.3 Using the eosLink-FD Interface

6.3.1 Menus 6.3.1 Buttons 6.3.1 Status Bar

7 Logged Data Files

8 TroubleShooting

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This is an infobox It provides extra information about your eosFD!

? This is a warning It tells you important details about how to keep you and your equipment safe!

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1 Summary

This manual outlines the operation and features of the eosFD-CO2 carbon dioxide (CO2) Forced Diffusion (FD) chamber, as well as the included eosLink-FD software package. Before supplying power to the eosFD please ensure that you read the section on Power Connectors to avoid any damage to the sensor. We strongly recommended that all users read the complete manual before use.

This manual is intended for users of the eosFD with version 2.4.0 of the eosLink-FD interface. Please check the Customer Resources section of the Eosense website for the most up-to-date manuals and software.

If you have any specific questions or require additional guidance or information, please contact Eosense Technical Support through our website, by phone or by email:

support@eosense.com 888.352.8313

http://eosense.com/support

Want to jump right into collecting flux measurements? Section 2 (Quick Start Guide) tells you all you need to know to start out. For best results, we do recommend you read the entire manual!

Want to learn more about customizing your eosFD measurements? Section 5 (Using eosLink-FD) explains how to change the measurement frequency and collect data, as well as other important instrument settings

Running into problems? Section 7 (Troubleshooting) covers some of the most common issues and how to address them. And you can always contact us directly at support@eosense.com

Summary 1-1

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2 Introduction

2.1 What is Forced Diffusion

The eosFD is a stand-alone soil CO2 flux sensor, containing a single NDIR sensor, an internal data logger and small diaphragm pump. The eosFD uses Eosenses patented Forced Diffusion technology to measure soil CO2 flux directly. Traditionally, gas fluxes from the soil surface are measured using closed chamber systems, with these accumulation chambers trapping gas during the measurement period. CO2 concentrations continue to increase while the chamber is down, and different mathematical fits (typically linear or exponential) are applied to this data in order to indirectly estimate the original rate of flux.

Forced Diffusion is a membrane-based steady-state approach for measuring gas flux that establishes an equilibrium between gas flowing into the chamber and gas flowing out of the chamber through the membrane, without any external chamber movement. By carefully characterizing the diffusive properties of the membrane used in the instruments, the eosFD chamber gas concentration can be correlated directly to the gas flux rate. Essentially, the amount that this membrane limits the flow of gas out of the chamber is known, and thus by comparing the internal concentration to that outside of the instrument, the flux rate can be calculated. Unlike other automated chambers that lift and lower onto the soil surface, the Forced Diffusion approach does not require external moving parts, allowing it to be deployed in the harshest climates for extended periods without intervention.

For more information: Risk, D., Nickerson, N., Creelman, C., McArthur, G., Owens, J., 2011. Forced diffusion soil flux: a new technique for continuous monitoring of soil gas efflux. Agric. For. Meteorol. 151, 16221631.

2.2 How Flux is Calculated

Forced diffusion flux is calculated by calibrating the diffusive transport of gas across the eosFDs membrane. This flux rate depends on the effective diffusivity of the interface, the concentrations on either side and the path length between the two points. The relationships between these parameters are linear, and everything but the soil and atmospheric concentrations are assumed to be constant, which simplifies to a single calibration slope (G). The flux is then calculated by multiplying the difference in soil and atmosphere concentrations by the calibration slope:

Introduction 2-1

The full differential equation showing the (volume/surface area) scaled rate of change in flux rate equal to the flux from the soil surface (FS) minus the difference in concentration, C (scaled by both the path length L and the diffusivity of the interface, D).

The change in the flux rate is assumed to be zero (steady-state) over the timespan of the concentration measurements (~60 s).

The steady-state assumption reduces the equation to a linear dependence. As the path length and interface (membrane) diffusivity are constant, this can be represented by a single coefficient, G.

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In order to measure the difference in concentration used to calculate flux, the eosFD has two internal chambers where gas is exchanged with the atmosphere - the Soil Cavity and the Atmospheric Cavity. Gases emitted from the soil surface flow into the bottom of the eosFD and accumulate in the Soil Cavity. This gas is exchanged with the atmosphere through two of the membrane covered windows near the bottom of the eosFD. The other two windows lead to the Atmospheric Cavity, which encircles the inner Soil Cavity, but is isolated from direct exposure to soil gas.

When the measurement cycle occurs, samples from these two cavities are drawn (via internal pump) to the NDIR CO2 sensor for analysis, before being returned to the original cavity. These measurements are used to calculate the difference in concentration, C.

Introduction 2-2

For more information: Risk, D., Nickerson, N., Creelman, C., McArthur, G., Owens, J., 2011. Forced diffusion soil flux: a new technique for continuous monitoring of soil gas efflux. Agric. For. Meteorol. 151, 16221631.

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2.3 The Measurement Cycle

The eosFD samples gases from both the atmospheric and soil cavities within the device. The flow diagram below breaks down the steps that the eosFD goes through to calculate flux.

When gas is being transported to and from the sensor cavity, the eosFDs pump will be active, creating a distinct buzzing sound. This sound is also emitted when the unit is turned on (three short pulses) or when the eosFD accepts a command or data from the eosLink-FD software (one longer pulse).

Please note that how frequently the eosFD pump is active will depend on your measurement frequency. For the default 10 minute setting, you will hear the eosFD alternate between long (~20 second) pump activation and shorter (~2 second) pulses. This pattern will repeat twice per eosFD flux measurement, with the length of silence between measurements depending on the measurement frequency setting.

Gas enters the soil and ATM

cavities diffusively

Gas is pulled from the atmospheric cavity to the sensor for 20 seconds to purge the sensor cavity, then sampled (2 seconds)

every 7 seconds for five samples

Gas is then pulled from the soil cavity for 20 seconds,

then pulsed every 7 seconds for five samples

The CO2 sensor reports concentration data and temperature to internal datalogger

The eosFD applies the calibration slope, calculating flux from the soil/atmosphere

CO2 difference

The measurement is stored in internal memory, and

output as analog signals for external dataloggers

PC software can be used to collect data, change unit

settings

Introduction 2-2

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3 Quick Start Guide

The following steps will guide you through the basic setup and use of an eosFD chamber, with detailed information available in later sections of the manual.

1. First connect the uncapped socket of the eosFD to the single, 12-pin end of the SSC

Power and Data cable. Connect the DC+ Power Cable to the 2-pin end of the SSC Power and Data Cable then to

a 12+ VDC power supply, with the red lead going to positive and the black going to negative/ground (see Section 3). The eosFD should pulse the pump three times

Connect the 3-pin end of Serial Extension cable to the SSC, and the other (DB9) end to the USB/Serial converter.

2. Connect to the device using a Windows based PC, the eosLink-FD software, and the included data cable.

3. Check that the devices system time is set appropriately, and choose a measurement frequency (see Using eosLink-FD). Exit the program and then disconnect the Serial Extension cable. Sampling will begin automatically once disconnected from the eosLink-FD software if the eosFD remains connected to power (when the first measurement begins depends on the frequency settings).

The eosFD must be connected to power in order to connect to the eosLink-FD software and collect data

Quick Start Guide 3-1

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SSC Power and Data Cable Serial Extension Cable DC+ Power Cable USB/Serial converter.

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4. Attach the provided Mounting Ring to the top of the eosFD. Clear any vegetation from the soil surface and gently insert the chamber into the soil surface (depth of approximately 1.5 cm) or a previously installed collar, making sure that the bottom of the eosFD is flush with the soil surface. Use the provided pegs and line to secure the eosFD to the soil surface via the Mounting Ring.

5. If using an external datalogger to record FD measurements, connect the purple wire for flux, the grey wire for temperature and/or the blue wire for soil CO2 concentrations. Each wire should be connected with one of the black grounding wires as a 0-5 VDC differential voltage measurement.

6. After the desired monitoring time period has elapsed, connect to the device again as described in step 2 above. Use the Get Data button to transfer the data file to your computer.

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Quick Start Guide 3-2

Flux (-10-10 mol m-2s-1)

CO2 (soil) (0-5000 ppm)

Temperature (-20-50 C)

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4 Hardware

4.1 eosFD Housing

The eosFD housing is machined from acetal plastic, allowing for a durable, water-resistant and lightweight design. The instrument contains a single CO2 sensor, an internal datalogger and a small diaphragm pump. The housing incorporates a diffusive membrane, electrical interface ports and detachable leg mounting points for a stable field deployment.

The eosFD membrane is critical to proper operation of the device. The membrane should always appear uniform in colour and free from visible defects. It is important to periodically check the membrane, as use in field conditions may cause it to tear or otherwise become defective, and the membrane will degrade naturally over time. Membranes should be replaced annually for best results, though the membrane life-cycle may be shortened by exposure to harsh conditions. If dirty, membranes can be cleaned using a gentle tool, such as a soft toothbrush, and a squirt bottle of deionized water. Use the toothbrush lightly to dislodge any stubborn mud/sediment and then the squirt bottle to wash it off. Avoid using any solvents such as alcohol, as this can damage the probe's water resistance

The eosFD has two 12-pin sockets, one socket is capped and the other uncapped. Be mindful to use the uncapped socket when connecting the eosFD to power and/or the computer. The capped socket is for troubleshooting purposes only and should not be used.

4.2 Main Power and Data Cable

Sensor data is stored on the internal datalogger, which can be accessed using the 3-pin Data connector on the SSC, combined with the Serial Extension cable and the Serial/USB converter. The eosLink-FD software is used to collect stored data, as well as change any of the instruments settings (see Using eosLink-FD).

The eosFD ships with a standard 5 m power and data cable (SSC), shown in Figure 1, which plugs directly into the uncapped 12-pin socket on the eosFD housing. Power is supplied to the eosFD via the two pin connector on the opposite end of the SSC. This connector also has a tab and notch type system to ensure that the user connects power with the correct polarity. The eosFD may be powered by supplying regulated 12 VDC to the sensor via data logger, battery or other power supply device. Please see Power Connectors for more details. A longer 10 m cable (SLC) is also available. Figure 1 SCC Power and Data cable

Hardware 4-1

Align the notch on the connector with the tab on the 12-pin socket then push gently while hand tightening.

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4.3 Power Connectors

The DC+ external power cable (Figure 2) included with the eosFD is used to power the chamber from a DC power supply.

The DC+ cable includes a 2-pin connector for attachment to the SSC/SLC cables. The opposite end of the cable has bare leads, to allow for connection to a DC power supply. The black wire should be attached to the ground terminal of the DC power device, and the red wire should be attached to the positive terminal. The eosFD operates on 12 V DC power. Exceeding 12 V may damage the eosFD, please ensure that the voltage is regulated correctly before connecting the power supply to the unit. The power consumption will vary slightly depending upon the supplied voltage. The average draw for a 10 minute cycle is 100 mA (1.2 W) with a peak of 300 mA (3.6 W).

4.4 Data Cables

Figure 2 DC+ Power Cable

Communication between eosLink-FD and an eosFD uses the RS-232 Serial protocol. The following components may be used to facilitate this interface.

SSC Data/Power Cable - (Included) Used to power an eosFD as well as provide an RS-232 interface.

Serial Extension Cable- (Included) Connects the SSC data port to a USB-Serial converter. USB/Serial Converter - (Optional) Used to create a virtual COM Port, allowing the eosFD to be

connected to a computer through a USB port.

Figure 3 From left to right: SSC Power and Data Cable, Serial Extension Cable and USB/Serial converter.

Hardware 4-2

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4.5 Analog Data

In addition to the internal memory of the eosFD, users also have the option of recording analog data on an external data logger, using the three wires on the SCC Data/Power Cable.

Each wire should be connected along with one of the black grounding wires as a 0-5 V DC differential voltage measurement, with ranges as shown in the table below:

In order to interpret the analog signals, simply apply the appropriate linear transformation to the voltage data, as determined by the range. For example, to transform a temperature voltage signal, first divide the voltage by the 0-5 V range, then multiply by the -20-50 C temperature range. Finally, add the minimum of the temperature range. The example below shows each step for a reading of 3 V.

(1) 3 V / (5 V - 0 V) = 0.6 (2) 0.6 * (50 C - -20 C) = 42 C (3) 42 C + -20 C = 22 C

Thus a 3 V analog signal for temperature corresponds to 22 C.

Output Colour Range Units

CO2 Flux Purple -10 - 10 mol/m2/s

CO2 Concentration (Soil) Blue 0 - 5000 ppm

Sensor Temperature Grey -20 - 50 C

Figure 4 Analog adapter with three grounds

Hardware 4-3

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5 Deployment

5.1 Setup

Deployment 5-1

Situate the collar in a flat location, clear of any rocks or debris. Remove any larger vegetation from the general area. When possible, deploy the collar at least 24 hours prior to the start of eosFD measurement collection (or allow for some disturbance -related fluxes in the early portion of your data).

Gently tap the collar into the ground, ensuring that the force is distributed evenly across the top of the collar. This can be accomplished by placing a board or other flat object on top of the collar, and using a broad-head hammer. Ensure that the collar top of the collar remains parallel to the ground by tapping directly above the collar and not to one side or the other.

Where possible, insert the collar to near full depth, as excessive distance between the soil surface and the bottom of the eosFD can increase how long it takes the instrument to respond to changing flux rates. Ideally, a centimeter of space should be left, to aid in installation of the eosFD itself as well as collar retrieval.

Inspection of the edges of should show no significant gaps between the soil and collar, though some near-surface spacing is unavoidable. Upon subsequent visits to the field site, review these edges, as the soil should naturally fill in any gaps created during installation.

Try to minimize disturbance to the soil during collar installation, as this can increase the equilibration time between the eosFD and the soil, and potentially cause measurement errors if there is a particularly bad seal between the soil and collar at depth.

To deploy the eosFD in the installed collar, simply insert one side of the bottom ring into the collar until flush, then gently push on the opposite side until the eosFD is securely seated. Inspect all sides to ensure no gaps exist.

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Deployment 5-1

While the eosFD is water resistant, avoid situating the probe in areas of standing water or hollows where flooding is a possibility. For best results choose a flat, clear soil surface that is free of large rocks to insert the chamber. Where stability is a concern, use pegs and line to secure the eosFD to the soil surface via the attached Mounting Ring, ensuring that the guy-lines remain taut when the pegs are driven into the soil.

Connect the eosFD to the 12-pin end of the SSC Power and Data cable. Connect the DC+ Power Cable to the 2-pin end of the SSC Power and Data Cable then to a 12 VDC power supply. Once powered, the eosFD will make pulse the pump 2-3 times, which indicates that it is properly connected.

Figure 5 An eosFD deployed in the field, with uncovered aux port

Before deployment, ensure that the frequency and time are set appropriately

Prior to powering on the eosFD, verify all cables and wires are installed correctly to reduce the risk of fire or shock

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Figure 6 Top: Mildly fouled membrane. Bottom: Clean eosFD membranes

5.2 Maintenance

The eosFD should be checked every few months (monthly for best results). Check the power supply and connection, ensuring that the eosFD pump sounds when power is cycled. In the event of fouling, the eosFD membrane can be cleaned by first gently removing any particles using a dry, non-abrasive cloth. Then, use a damp (no solvents) cloth to gently remove any remaining dirt or substance. If the membrane appears to be significantly clogged or punctured in any way, contact Eosense immediately to determine if the membrane needs to be replaced. A damaged or fouled membrane can lead to inaccurate flux measurements by the device. Make sure to remove any vegetation growing in the collar or directly around the eosFD that may block the side membrane. Finally, ensure the collar is still flush with the surface, re-adjusting if necessary.

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6 Using eosLink-FD

6.1 Overview

eosLink-FD is an application that allows the user to communicate with the eosFD chamber in order to change various instrument settings, as well as collect and clear logged data. eosLink-FD is compatible with Windows PCs.

6.2 Installing and Connecting

Once the port is selected, the eosFD will automatically attempt to connect. When the connection is successfully established, the grayed out buttons and text will become active, and the eosFD serial number and storage capacity will be shown at the bottom of the window.

6.3 Using the eosLink-FD Interface

The eosLink-FD window consists of four menus, five buttons and a status section at the bottom, as detailed in the following subsections. Once the eosFD has been connected, the user can begin modifying instrument settings. Left idle, the eosFD will automatically disconnect after ten minutes of disuse (timeout restarted every time a command is sent.)

Figure 7 eosLink-FD Change COM Port window

Using eosLink - FD 6-1

Simply copy the eosLink-FD.zip file (available on the Customer Resources section of our website, or by contacting us at: support@eosense.com) to a suitable directory on the PC in question, then unzip the file, which contains the eosLink-FD software folder. None of the files in this folder should be removed or changed in any way. If this occurs, simply delete the entire folder from your PC and re-extract from the zip file to recreate the folder.

We recommended that you connect the data cable to your computer prior to launching eosLink-FD; however you may also refresh the program from the Connection menu. You may have to refer to the Windows Device Manager if several serial port devices are connected to the computer, and choose the correct port through (OptionsChange COM Port).

If your eosFD is an older model or has older firmware, the eosLink-FD software may display Compatibility Mode in the title bar. This indicates that some of the newer features of the software may be unavailable - contact support@eosense.com for more information

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6.3.1 Menus

There are four menus visible at the top of the eosLink-FD window:

File: This menu provides the ability to collect both the measurement data file as well as the error log file (both commands also have their own dedicated button) as well as a means of exiting the program.

Connection: The Connection menu has three options, including the ability to refresh the list of available COM ports and choose a specific port number. If the program was launched prior to the eosFD being connected, you will need to refresh the connection to allow the correct port to be chosen.

Options: This contains a number of secondary functions which are described below.

Pump Options window allows the user to change the pump settings used to draw and analyzer soil and atmospheric cavity CO2 gas concentrations. Altering these values may affect the accuracy of measured flux rates. Purge Time refers to the length of the purge cycle between atmospheric and cavity samples. The Number of Samples sets the number of concentration measurements from which the median concentration is taken. Finally, the Draw Time controls how long to allow for pump-transport of gas from a soil or atmospheric cavity to the sensor for analysis.

The Device Settings window allows the user to change the eosFDs operating mode, serial number and stored calibration. Please contact Eosense for access to these options if required. Changing these options may prevent the eosFD from collecting flux measurements. Logging Mode is the normal operating mode for the eosFD, while Calibration Mode allows for recalibration of the internal CO2 sensor. Reset Aux Flags reverts any changes to the internal diagnostic values, and Factory Restore reverts any changes made to the eosFD settings, including calibration parameters and measurement frequency settings.

Figure 8 The pump Options Window

Figure 9 The Device Settings Window

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Record Concentrations window has three suboptions; Soil cavity, Atmospheric Cavity, and Alternating. The suboptions are convenient for troubleshooting purposes as it allows the user to directly measure soil, atmosphere or alternating concentrations at a relatively high frequency. While recording, a pop-up window displays the sampling measurements which allows the user monitor the concentrations live. When sampling is complete, the data will automatically save to the eosLink-FD software folder.

Alternating data will correlate atmosphere and soil concentrations by an identification number (0 or 1) located in the fourth data column (Figure 9). The Atmospheric Cavity is identified by 0 and Soil Cavityas 1.

Figure 10 Example of eosFD Alternating Cavity Data, viewed as a spreadsheet

The eosFD Settings File menuallows a calibration batch file (concentration and flux) to be uploaded to the eosFD, or exported to a local file. This functionality allows for easy restoration of factory calibration settings. To export a settings file, choose Export Settings. The eosFD serial numbers and calibration parameters will be requested from the instrument, and then displayed in a new window. Clicking the Export Settings will then allow you to choose a location to save these values for future use.

To upload a settings file, choose Upload File from the menu, and then navigate to a compatible file (.cal extension). The contained calibration settings will be read in and displayed beside the current instrument parameters. Click the Upload Settings button to transfer the new coefficients to the connected eosFD.

The time at which the measurement occurred (seconds) The soil/atmosphere concentration of CO2 in ppm. The approximate internal temperature of the eosFD in C. Atmosphere Identity (0) Soil Identity (1)

Time Elapsed Concentration Temperature ATM/Soil Identity

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Figure 11 Uploading an eosFD Settings File

The eosFD Template Files menu allows the user to export eosFD measurement settings as a local file, which can be used to quickly customize the instrument for different deployment conditions (e.g. less frequent measurements for off-grid sites) or to standardize settings amongst multiple eosFDs.

To create a template, choose Export Template from the eosFD Template Files menu, then choose a save location and filename. The current measurement frequency and start time will be shown, along with the option to embed a command to synchronize the clock of the eosFD with the local PC when the template is applied.

Figure 12 Exporting an eosFD Template File

To apply a template file to an eosFD, choose Upload Template from the eosFD Template Files menu, then navigate to a compatible file (.efd extension). Once the file has been read, the applicable eosFD measurement settings will be displayed for confirmation. Clicking Upload Template will apply the frequency and start time settings, and sync the instrument clock with the local PC (if applicable)

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Figure 13 Uploading an eosFD Template File

The Performance Check option allows the user to assess the atmospheric concentration and zero flux stability of the eosFD. Choosing this option displays a short explanation of the required procedure, with the Start Check button used to launch the data collection.

Before proceeding, ensure that the eosFD side windows and bottom opening are exposed to atmospheric air. For best results, avoid standing directly beside the unit during the Performance Check.

Figure 14 Starting an eosFD Performance Check test

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Once the Performance Check has begun, the eosFD will run through several accelerated measurement cycles. During this time, the internal pump will operate frequently, as will the valves. Two progress bars will show the tests progression.

Figure 15 An eosFD Performance Check in progress

Once the data collection is complete, the results will be quickly analyzed and presented in two tabs.

Figure 16 Performance Check results for the zero flux measurements (left) and the atmospheric comparison (right).

The results should show an average flux within 0.2 umol/m2/s of zero under normal conditions, while the Concentration Results will show an average CO2 concentration near 400 ppm. Differences between the concentration observed by the eosFD (e.g. concentration drift) can be resolved through the Upload Offset button, though this is not necessary for accurate flux measurements due to the Forced Diffusion method.

Admin Mode allows the user to enter a password to enable additional eosFD modifications. These are not required for normal eosFD operation (see Note below).

NOTE: Pump Options, Device Settings and Upload Settings File are restricted to administrator access only. These settings should not require alteration, however, in special cases where this is necessary please contact support@eosense.com for access.

Using eosLink - FD 6-3

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Help: This menu contains a brief information window about the version of eosLink-FD that is being used and the option to record a debug file for troubleshooting purposes.

6.3.2 Buttons

Get Data: This command (also available from the File menu) allows the user to collect all stored data from an eosFD Chamber and save it on their local PC. Clicking the button opens a file selection window, allowing the user to chose a path and filename to store the logged data. Once they have selected a location, the file transfer will begin. Depending on the size of the data file, this may take several minutes, during which time a progress bar will be displayed over the main window with to show estimated time remaining. Collected data will be appended to the end of the selected file if it already exists.

Figure 18 The save eosFD Data window

Using eosLink - FD 6-4

Figure 17 eosLink-FD main window, showing a connected eosFD Chamber.

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When the data collection is complete, a summary of the three most recent measurement periods (determined by when the eosLink-FD software is used to connect to the instrument) will be shown.

Figure 19 The eosFD Data Summary window, showing average flux and temperature values during the last measurement period, as well as power outages.

This data summary provides average flux and temperature values, along with their standard deviations. It also highlights any potential problems encountered, such as frequent power cycling or unusual flux measurements (e.g. very high or negative CO2 fluxes). This data can be exported to a text file using the Export Summary button.

Figure 20 An exmaple eosFD data summary text file

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Set Time: This option allows the user to change the clock setting on the eosFDs internal data logger. Clicking this button opens a window that allows the user to chose a time and date to update the eosFDs on-board clock. The timestamp used in the logged data file will correspond to the eosFDs internal clock, so ensure that this time is set correctly. The date is chosen using a small calendar, while the time is set by entering the current time in a 24-hour format (e.g. 6:30 PM would be 18:30:00). To sync the eosFD clock with the connected PC, click the System Time button in the upper right, then click Apply.

Frequency: This command allows the user to change the frequency of data logging by changing the amount of time that elapses between the beginning of measurements in minutes (minimum of 5 minutes, maximum of 1440 minutes or 1 day). From this window, the user may also choose the starting time, which is used to align the starting point for measurements. For example, if the desired measurement frequency is twice an hour, at :00 and :30, then the user would select a Data Frequency of 30 m and a start time with 0 for minutes. Please note that the start time does not prevent the eosFD from recording data before this time is reached.

Figure 13 The Set Time and Date window

Figure 14 The Set Measurement Frequency window

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Example: From the data shown below, the eosFD was powered on at 22:48 with a frequency of 10 minutes and the default Starting Time of 0:00. As you can see, the eosFD aligned measurements so that regardless of when it was powered on, a sample would be taken at the default Starting Time of 0:00:00.

eosFD powered on, began taking samples

Automatically aligning timestamps to Starting Time

Sample taken at Starting Time

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Calibration: This command changes the calibration used to calculate the flux of CO2. This option is included to facilitate recalibration during membrane replacement and to correct for CO2 sensor drift. This command should not be used without consulting Eosense. Setting the calibration parameters incorrectly will result in flux measurement errors.

Clear Data: This command erases all stored data from the eosFD while leaving the time, frequency and calibration settings unchanged. The user must confirm the deletion of stored data by clicking Delete in the popup window. As the eosFD has enough memory to store over seven months of data at the highest frequency (every five minutes), this should rarely be required. Clearing the data periodically allows for quicker file transfers on subsequent uses. This process will take 5-10 minutes

6.3.3 Status Bar

The status bar found at the bottom of the eosLink-FD program window is used to communicate status updates to the user. While the majority of important notifications will come in the form of popup windows, the status bar is used to update the user regarding connection status, as well as the serial number and storage capacity of the connected eosFD. When working with multiple eosFDs, ensure that the displayed serial number matches the connected unit, to avoid issues with incorrectly named data files.

Figure 15 The Calibration Settings window

Figure 16 The confirmation window for clearing store data

Figure 17 eosLink-FD main window, showing Status Bar

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Warning!! there is no way to recover the stored data once it has been cleared.!

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7 Logged Data Files

The measurement data file is formatted as a comma separated values file (.csv), allowing for easy importing into spreadsheet or plotting software.

Month Day Year Time Flux Temperature CO2_Soil CO2_Soil_STD CO2_ATM CO2_ATM_STD Mode

The month in which the measurement was collected. The day of the month in which the measurement was collected. The year in which the measurement was collected. The time at which the measurement occurred (24 hour clock). The estimated CO2 flux rate from the soil surface in mol m2s1. The approximate internal temperature of the eosFD in C. The soil surface concentration of CO2 in ppm. The standard deviation of the soil surface concentration of CO2 in ppm. The atmospheric concentration of CO2 in ppm. The standard deviation of the atmospheric concentration of CO2 in ppm. A status indicator showing when events occur (e.g. power outages)

0: Normal measurement data 1: Unit startup / power cycle 2: eosLink-FD connection detected 10-19: Unit startup with error code (contact support@eosense.com)

Figure 18 Example eosFD data, viewed as a spreadsheet

Logged Data Files 7-1

Example flux data showing diurnal variation:

Time (days)

C O

2 F lu

x (

m ol

/m 2 /s

)

The Mode field is useful for diagnosing power issues, as frequent 1s indicates the unit starting up after a power outage

?

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8 Troubleshooting

This section provides a few example problems that may occur during use, and the appropriate action that should be taken to resolve the issue. For these issues as well as any others that arise, please contact Eosense through email at support@eosense.com with subject eosFD Support, or through the support section of our website (http://www.eosense.com/support/).

I cannot connect to the eosFD on my computer using eosLink-FD. First, try refreshing the connection through the Connection menu. Ensure that the COM port set in the software matches the one used by the data cable (the Windows Device Manager may be useful for identifying the eosFD COM port). If the problem persists, try unplugging the data cable from the USB port, waiting several seconds, and then plugging it in again (remember to refresh the connection or close and relaunch eosLink-FD). Connecting through a different USB port on your computer may also help. If the problem is still not resolved, try a different data cable if available (additional data cables can be ordered from Eosense). If the problem still occurs, please contact Eosense for additional guidance.

The eosFD housing or wires have been damaged, what should I do? Contact Eosense before attempting any repairs.

I am getting odd flux values, how should I correct this? The eosFD membrane may have become damaged, or the CO2 sensor calibration may have drifted unexpectedly. Contact Eosense to see if recalibration is required.

The logged data file shows just the header, no values.

Double check that enough time has elapsed that the measurement frequency has been met. If the problem persists, please contact Eosense.

The timestamp in the data file is incorrect.

Reset the eosFD clock using eosLink-FD and then disconnect the eosFD from power. Reconnect the eosFD and check the system time (from the defaults in the Set Time and Date window). If the problem persists, please contact Eosense.

Running the software gives an error: libgdk-win32-2.0-0.dll is missing from the

computer This error indicates that the executable is missing the (hidden) system files. This happens when the .exe is moved from its original position in the software folder. To resolve this problem, keep the executable in the same folder as it was downloaded in (or re-extract the .zip file and use that as the new software folder).

Trou

Manualsnet FAQs

If you want to find out how the eosFDCO2 Campbell Scientific works, you can view and download the Campbell Scientific eosFDCO2 Chamber User Manual on the Manualsnet website.

Yes, we have the User Manual for Campbell Scientific eosFDCO2 as well as other Campbell Scientific manuals. All you need to do is to use our search bar and find the user manual that you are looking for.

The User Manual should include all the details that are needed to use a Campbell Scientific eosFDCO2. Full manuals and user guide PDFs can be downloaded from Manualsnet.com.

The best way to navigate the Campbell Scientific eosFDCO2 Chamber User Manual is by checking the Table of Contents at the top of the page where available. This allows you to navigate a manual by jumping to the section you are looking for.

This Campbell Scientific eosFDCO2 Chamber User Manual consists of sections like Table of Contents, to name a few. For easier navigation, use the Table of Contents in the upper left corner.

You can download Campbell Scientific eosFDCO2 Chamber User Manual free of charge simply by clicking the “download” button in the upper right corner of any manuals page. This feature allows you to download any manual in a couple of seconds and is generally in PDF format. You can also save a manual for later by adding it to your saved documents in the user profile.

To be able to print Campbell Scientific eosFDCO2 Chamber User Manual, simply download the document to your computer. Once downloaded, open the PDF file and print the Campbell Scientific eosFDCO2 Chamber User Manual as you would any other document. This can usually be achieved by clicking on “File” and then “Print” from the menu bar.