Campbell EC150 User manual

EC150 CO2and H2O Open-Path
Gas Analyzer
Revision: 6/13
Copyright © 2010-2013
Campbell Scientific, Inc.

Warranty
“PRODUCTS MANUFACTURED BY CAMPBELL SCIENTIFIC, INC. are
warranted by Campbell Scientific, Inc. (“Campbell”) to be free from defects in
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months from date of shipment unless otherwise specified in the corresponding
Campbell pricelist or product manual. Products not manufactured, but that are
re-sold by Campbell, are warranted only to the limits extended by the original
manufacturer. Batteries, fine-wire thermocouples, desiccant, and other
consumables have no warranty. Campbell's obligation under this warranty is
limited to repairing or replacing (at Campbell's option) defective products,
which shall be the sole and exclusive remedy under this warranty. The
customer shall assume all costs of removing, reinstalling, and shipping
defective products to Campbell. Campbell will return such products by surface
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locations, Campbell will return such products best way CIP (Port of Entry)
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performed by Campbell such as programming to customer specifications,
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Assistance
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CAMPBELL SCIENTIFIC, INC.
RMA#_____
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
Table of Contents
PDF viewers: These page numbers refer to the printed version of this document. Use the
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1. Introduction.................................................................1
2. Cautionary Statements...............................................1
3. Initial Inspection .........................................................2
4. Overview......................................................................2
5. Specifications .............................................................2
5.1 Measurements ......................................................................................2
5.2 Output Signals......................................................................................5
5.3 Physical Description.............................................................................5
5.4 Power Requirements During Power-up and Operation ........................6
6. Installation...................................................................6
6.1 Orientation ...........................................................................................6
6.2 Mounting..............................................................................................6
6.3 Wiring and Connections.....................................................................11
7. Settings......................................................................14
7.1 Factory Defaults.................................................................................14
7.2 Details ................................................................................................15
7.2.1 SDM Address..............................................................................15
7.2.2 Bandwidth...................................................................................15
7.2.3 Unprompted Output ....................................................................15
7.2.4 Unprompted Output Rate ............................................................15
7.2.5 RS-485 Baud Rate.......................................................................16
7.2.6 Analog Output.............................................................................16
7.2.7 ECMon Update Rate ...................................................................16
7.2.8 Temperature Sensor ....................................................................16
7.2.9 Fixed Temperature Value............................................................16
7.2.10 Pressure Sensor ...........................................................................16
7.2.10.1 Pressure Gain....................................................................17
7.2.10.2 Pressure Offset .................................................................17
7.2.10.3 Fixed Pressure Value........................................................17
7.2.11 Pressure Differential Enable .......................................................17
7.2.12 Heater Control.............................................................................17
7.3 ECMon...............................................................................................17
7.4 Device Configuration Utility..............................................................19
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8. EC100 Outputs ..........................................................19
8.1 SDM Output ...................................................................................... 20
8.2 USB or RS-485 Output...................................................................... 20
8.3 Analog Outputs.................................................................................. 22
9. Maintenance ..............................................................23
9.1 Routine Site Maintenance.................................................................. 23
9.2 Gas Analyzer Wicks.......................................................................... 23
9.3 Analyzer Window Cleaning .............................................................. 24
9.4 Zero and Span.................................................................................... 25
9.5 Replacing the EC150 Desiccant/CO2Scrubber Bottles..................... 29
9.6 Factory Recalibration ........................................................................ 30
10. Datalogger Programming with CRBasic .................30
10.1 EC100() Instruction ........................................................................... 30
10.2 EC100Configure() Instruction........................................................... 33
10.2.1 ConfigCmd 11 Zero-and-Span Control ...................................... 35
10.2.2 ConfigCmd 18 Heater Voltage................................................... 35
10.3 Example CRBasic Program............................................................... 36
11. Theory of Operation..................................................37
Appendices
A. Filter Bandwidth and Time Delay...........................A-1
B. Useful Equations.....................................................B-1
C. Material Safety Data Sheets (MSDS) .....................C-1
C.1 Magnesium Perchlorate MSDS ....................................................... C-1
C.2 Decarbite MSDS.............................................................................. C-2
D. Packing Information................................................D-1
D.1 EC150-GH Packing Information ..................................................... D-1
D.2 EC150-SH Packing Information...................................................... D-2
Figures
5-1. Dimensions of EC150 analyzer head................................................... 6
6-1. Exploded view of mounting the CSAT3A sonic head and EC150
gas analyzer head ............................................................................. 8
6-2. Exploded view of mounting the EC150 gas analyzer head without
the CSAT3A .................................................................................... 8
6-3. EC100 enclosure mounting bracket mounted on a vertical mast
(left) and a tripod leg (right) .......................................................... 10
6-4. Exploded view of mounting the EC100 enclosure ............................ 10
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Table of Contents
6-5. EC100 electronics front panel. The one on the left shows
how the EC100 will look shipped from the factory (enhanced
barometer shown). The one on the right shows the panel
after the user has done all the wiring and made all connections
(basic barometer shown).................................................................11
6-6. Bottom of EC100 enclosure ...............................................................12
7-1. The Main screen in ECMon ...............................................................18
7-2. The Setup screen in ECMon...............................................................19
8-1. An example of USB data output in terminal mode ............................21
9-1. Proper location of the gas analyzer top wick (left) and bottom
wick (right) .....................................................................................24
9-2. The zero-and-span shroud mounted on the zero-and-span stand.
The top tube is the gas intake, the black cable is the temperature
thermistor, and the short bottom tube is the gas exhaust. ...............26
9-3. ECMon zero-and-span window..........................................................27
9-4. Replacing the desiccant/CO2scrubber bottles....................................29
A-1. Frequency and amplitude response of the EC100 filter at various
bandwidths................................................................................... A-2
A-2. Frequency response comparison of the EC100 10-Hz bandwidth
and a 50-msec moving average.................................................... A-3
Tables
6-1. EC100 SDM output to a Campbell Scientific CR1000, CR3000,
or CR5000 Datalogger....................................................................13
7-1. Factory Default Settings.....................................................................14
8-1. USB and RS-485 Output Elements ....................................................21
8-2. Multipliers and Offsets for Analog Outputs.......................................22
9-1. Rain Wick Replacement Parts............................................................23
10-1. Output Modes for EC100 Instruction.................................................31
10-2. Bits in the Sonic Diagnostic Flag .......................................................31
10-3. Bits in the Gas Diagnostic Flag..........................................................32
10-4. ConfigCmd Values for Setting and Retrieving Settings.....................34
A-1. Filter Time Delays for Various Bandwidths ................................... A-3
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
EC150 CO2and H2O Open-Path Gas
Analyzer
1. Introduction
The EC150 is an in-situ, open-path, mid-infrared absorption gas analyzer that
provides measurements of absolute densities of carbon dioxide and water
vapor. The EC150 may be used in conjunction with the CSAT3A sonic
anemometer, which measures orthogonal wind components.
Before using the EC150, please study
•Section 2, Cautionary Statements
•Section 3, Initial Inspection
•Section 6, Installation
More details are available in the remaining sections.
2. Cautionary Statements
•DANGER:
oThe scrubber bottles (see Section 9.5, Replacing Desiccant and
Scrubber Bottles) contain the strong oxidizing agents sodium
hydroxide (caustic soda, NaOH) and anhydrous magnesium
perchlorate (Mg(ClO4)2).
Avoid direct contact with the chemicals.
Ensure your work area is well ventilated and free of
reactive compounds, including liquid water.
Store used chemical bottles in a sealed container until
disposal.
Dispose of chemicals and bottles properly.
Materials Safety Data Sheets (MSDS) are provided in
Appendix C. MSDS are updated periodically by
chemical manufacturers. Obtain current MSDS at
www.campbellsci.com.
•WARNING:
oDo not carry the EC150 or CSAT3A by the arms or carry the
EC150 by the strut between the arms. Always hold them by the
block, where the upper and lower arms connect.
oHandle the EC150 carefully. The optical source may be damaged
by rough handling, especially while the analyzer is powered.
oOver-tightening bolts will damage or deform the mounting
hardware.
•CAUTION:
oGrounding the EC100 measurement electronics is critical. Proper
grounding to earth (chassis) will ensure maximum ESD
(electrostatic discharge) protection and improve measurement
accuracy.
oDo not connect or disconnect the gas analyzer or sonic connectors
while the EC100 is powered.
oThe SDM, USB, and RS-485 output options include EC150
diagnostic data. Be aware that the absence of diagnostic data in
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EC150 CO2and H2O Open-Path Gas Analyzer
the analog output option could make troubleshooting difficult and
may lead to the user not being aware of potential problems with
the instrumentation (see Section 8, EC100 Outputs).
oResting the analyzer on its side during the zero-and-span
procedure may result in measurement inaccuracy.
oWhen cleaning the gas-analyzer window, make sure the alcohol
and any residual water completely evaporate before proceeding
with the zero-and-span procedure (see Section 9.3, Analyzer
Window Cleaning).
3. Initial Inspection
Upon receipt of your equipment, inspect the packaging and contents for
damage. File damage claims with the shipping company.
4. Overview
The EC150 is an in-situ open path mid-infrared absorption analyzer that
measures absolute densities of carbon dioxide and water vapor. It has been
designed specifically for eddy covariance flux measurements and may be used
in conjunction with the CSAT3A 3D sonic anemometer sensor head. The
analyzer has a rugged, aerodynamic design with low power requirements,
making it suitable for field applications.
The EC150 gas analyzer head, along with a temperature probe and optional
external barometer, connect directly to the EC100 electronics. After receiving
inputs from these sensors, the EC100 computes CO2and H2O absolute
densities. A CSAT3A sonic anemometer head may also be connected to the
EC100. The EC100 synchronizes data from the EC150 and the CSAT3A,
essential for valid flux measurements using the eddy covariance method.
The EC150 has been designed specifically to address issues of aerodynamics,
power consumption, spatial displacement, and temporal synchronicity. Its
unique design contains no obstructions surrounding the sample volume; it
operates with 5 W of power at room temperature; it has minimal spatial
displacement from the sample volume of a CSAT3A sonic anemometer head;
and the EC100 synchronously samples data from the EC150 and CSAT3A.
5. Specifications
5.1 Measurements
Features
•To compute carbon dioxide and water vapor fluxes using the eddy-
covariance method, the EC150 measures:
oabsolute carbon dioxide
owater vapor densities
othree-dimensional wind speed (requires the CSAT3A)
osonic air temperature (requires the CSAT3A)
oair temperature
obarometric pressure
2