CS IRGASON User manual

INSTRUCTION MANUAL
IRGASON®Integrated CO
2
/H
2
O
Open-
Path Gas Analyzer and
3D Sonic Anemometer
Revision: 4/16
Copyright © 2010-2016
Campbell Scientific, Inc.

Guarantee
This equipment is guaranteed against defects in materials and workmanship.
We will repair or replace products which prove to be defective during the
guarantee period as detailed on your invoice, provided they are returned to us
prepaid. The guarantee will not apply to:

Equipment which has been modified or altered in any way without the
written permission of Campbell Scientific

Batteries

Any product which has been subjected to misuse, neglect, acts of God or
damage in transit.
Campbell Scientific will return guaranteed equipment by surface carrier
prepaid. Campbell Scientific will not reimburse the claimant for costs incurred
in removing and/or reinstalling equipment. This guarantee and the Company’s
obligation thereunder is in lieu of all other guarantees, expressed or implied,
including those of suitability and fitness for a particular purpose. Campbell
Scientific is not liable for consequential damage.
Please inform us before returning equipment and obtain a Repair Reference
Number whether the repair is under guarantee or not. Please state the faults as
clearly as possible, and if the product is out of the guarantee period it should
be accompanied by a purchase order. Quotations for repairs can be given on
request. It is the policy of Campbell Scientific to protect the health of its
employees and provide a safe working environment, in support of this policy a
“Declaration of Hazardous Material and Decontamination” form will be
issued for completion.
When returning equipment, the Repair Reference Number must be clearly
marked on the outside of the package. Complete the “Declaration of
Hazardous Material and Decontamination” form and ensure a completed copy
is returned with your goods. Please note your Repair may not be processed if
you do not include a copy of this form and Campbell Scientific Ltd reserves
the right to return goods at the customers’ expense.
Note that goods sent air freight are subject to Customs clearance fees which
Campbell Scientific will charge to customers. In many cases, these charges are
greater than the cost of the repair.
Campbell Scientific Ltd,
80 Hathern Road,
Shepshed, Loughborough, LE12 9GX, UK
Tel: [phone]
Fax: [phone]
Email: [e-mail]
www.campbellsci.co.uk

PLEASE READ FIRST
About this manual
Please note that this manual was originally produced by Campbell Scientific Inc. primarily for the North
American market. Some spellings, weights and measures may reflect this origin.
Some useful conversion factors:
Area: 1 in2(square inch) = 645 mm2
Length: 1 in. (inch) = 25.4 mm
1 ft (foot) = 304.8 mm
1 yard = 0.914 m
1 mile = 1.609 km
Mass: 1 oz. (ounce) = 28.35 g
1 lb (pound weight) = 0.454 kg
Pressure: 1 psi (lb/in2) = 68.95 mb
Volume: 1 UK pint = 568.3 ml
1 UK gallon = 4.546 litres
1 US gallon = 3.785 litres
In addition, while most of the information in the manual is correct for all countries, certain information
is specific to the North American market and so may not be applicable to European users.
Differences include the U.S standard external power supply details where some information (for
example the AC transformer input voltage) will not be applicable for British/European use. Please note,
however, that when a power supply adapter is ordered it will be suitable for use in your country.
Reference to some radio transmitters, digital cell phones and aerials may also not be applicable
according to your locality.
Some brackets, shields and enclosure options, including wiring, are not sold as standard items in the
European market; in some cases alternatives are offered. Details of the alternatives will be covered in
separate manuals.
Part numbers prefixed with a “#” symbol are special order parts for use with non-EU variants or for
special installations. Please quote the full part number with the # when ordering.
Recycling information
At the end of this product’s life it should not be put in commercial or domestic refuse but
sent for recycling. Any batteries contained within the product or used during the
products life should be removed from the product and also be sent to an appropriate
recycling facility.
Campbell Scientific Ltd can advise on the recycling of the equipment and in some cases
arrange collection and the correct disposal of it, although charges may apply for some
items or territories.
For further advice or support, please contact Campbell Scientific Ltd, or your local agent.
Campbell Scientific Ltd, 80 Hathern Road, Shepshed, Loughborough, LE12 9GX, UK
Tel: [phone] Fax: [phone]
Email: [e-mail]
www.campbellsci.co.uk

Precautions
DANGER —MANY HAZARDS ARE ASSOCIATED WITH INSTALLING, USING, MAINTAINING, AND WORKING ON
OR AROUND TRIPODS, TOWERS, AND ANY ATTACHMENTS TO TRIPODS AND TOWERS SUCH AS SENSORS,
CROSSARMS, ENCLOSURES, ANTENNAS, ETC. FAILURE TO PROPERLY AND COMPLETELY ASSEMBLE,
INSTALL, OPERATE, USE, AND MAINTAIN TRIPODS, TOWERS, AND ATTACHMENTS, AND FAILURE TO HEED
WARNINGS, INCREASES THE RISK OF DEATH, ACCIDENT, SERIOUS INJURY, PROPERTY DAMAGE, AND
PRODUCT FAILURE. TAKE ALL REASONABLE PRECAUTIONS TO AVOID THESE HAZARDS. CHECK WITH YOUR
ORGANIZATION'S SAFETY COORDINATOR (OR POLICY) FOR PROCEDURES AND REQUIRED PROTECTIVE
EQUIPMENT PRIOR TO PERFORMING ANY WORK.
Use tripods, towers, and attachments to tripods and towers only for purposes for which they are designed. Do not
exceed design limits. Be familiar and comply with all instructions provided in product manuals. Manuals are
available at www.campbellsci.eu or by telephoning [phone] (UK). You are responsible for conformance
with governing codes and regulations, including safety regulations, and the integrity and location of structures or land
to which towers, tripods, and any attachments are attached. Installation sites should be evaluated and approved by a
qualified engineer. If questions or concerns arise regarding installation, use, or maintenance of tripods, towers,
attachments, or electrical connections, consult with a licensed and qualified engineer or electrician.
General
•Prior to performing site or installation work, obtain required approvals and permits. Comply with all
governing structure-height regulations, such as those of the FAA in the USA.
•Use only qualified personnel for installation, use, and maintenance of tripods and towers, and any
attachments to tripods and towers. The use of licensed and qualified contractors is highly recommended.
•Read all applicable instructions carefully and understand procedures thoroughly before beginning work.
•Wear a hardhat and eye protection, and take other appropriate safety precautions while working on or
around tripods and towers.
•Do not climb tripods or towers at any time, and prohibit climbing by other persons. Take reasonable
precautions to secure tripod and tower sites from trespassers.
•Use only manufacturer recommended parts, materials, and tools.
Utility and Electrical
•You can be killed or sustain serious bodily injury if the tripod, tower, or attachments you are installing,
constructing, using, or maintaining, or a tool, stake, or anchor, come in contact with overhead or
underground utility lines.
•Maintain a distance of at least one-and-one-half times structure height, or 20 feet, or the distance
required by applicable law, whichever is greater, between overhead utility lines and the structure (tripod,
tower, attachments, or tools).
•Prior to performing site or installation work, inform all utility companies and have all underground utilities
marked.
•Comply with all electrical codes. Electrical equipment and related grounding devices should be installed
by a licensed and qualified electrician.
Elevated Work and Weather
•Exercise extreme caution when performing elevated work.
•Use appropriate equipment and safety practices.
•During installation and maintenance, keep tower and tripod sites clear of un-trained or non-essential
personnel. Take precautions to prevent elevated tools and objects from dropping.
•Do not perform any work in inclement weather, including wind, rain, snow, lightning, etc.
Maintenance
•Periodically (at least yearly) check for wear and damage, including corrosion, stress cracks, frayed cables,
loose cable clamps, cable tightness, etc. and take necessary corrective actions.
•Periodically (at least yearly) check electrical ground connections.
WHILE EVERY ATTEMPT IS MADE TO EMBODY THE HIGHEST DEGREE OF SAFETY IN ALL CAMPBELL
SCIENTIFIC PRODUCTS, THE CUSTOMER ASSUMES ALL RISK FROM ANY INJURY RESULTING FROM IMPROPER
INSTALLATION, USE, OR MAINTENANCE OF TRIPODS, TOWERS, OR ATTACHMENTS TO TRIPODS AND TOWERS
SUCH AS SENSORS, CROSSARMS, ENCLOSURES, ANTENNAS, ETC.

i
Table of Contents
PDF viewers: These page numbers refer to the printed version of this document. Use the
PDF reader bookmarks tab for links to specific sections.
1. Introduction ................................................................1
2. Precautions ................................................................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........................7
6. Installation ..................................................................7
6.1 Orientation ...........................................................................................7
6.2 Mounting..............................................................................................7
6.3 Wiring and Connections.....................................................................11
7. Settings.....................................................................15
7.1 Factory Defaults.................................................................................16
7.2 Bandwidth ..........................................................................................16
7.3 SDM Address.....................................................................................16
7.4 Unprompted Output ...........................................................................17
7.5 Unprompted Output Rate ...................................................................17
7.6 RS-485 Baud Rate..............................................................................17
7.7 Analog Output....................................................................................17
7.8 ECMon Update Rate ..........................................................................17
7.9 Temperature Sensor ...........................................................................17
7.10 Fixed Temperature Value...................................................................17
7.11 Pressure Sensor ..................................................................................18
7.11.1 Pressure Gain ..............................................................................18
7.11.2 Pressure Offset............................................................................18
7.11.3 Fixed Pressure Value ..................................................................18
7.12 Pressure Differential Enable ..............................................................18
7.13 Heater Control....................................................................................18
7.14 ECMon...............................................................................................19
7.15 Device Configuration Utility..............................................................21
8. EC100 Outputs .........................................................22
8.1 SDM Output.......................................................................................22
8.2 USB or RS-485 Output ......................................................................22
8.3 Analog Outputs ..................................................................................24

Table of Contents
ii
9. Maintenance .............................................................25
9.1 Routine Maintenance......................................................................... 25
9.2 Wick Maintenance............................................................................. 25
9.2.1 Sonic Wicks ............................................................................... 25
9.2.2 Gas Analyzer Wicks................................................................... 27
9.3 Gas-Analyzer Window Cleaning....................................................... 28
9.4 Zero and Span.................................................................................... 28
9.5 Replacing Desiccant and Scrubber Bottles........................................ 32
9.6 Factory Recalibration ........................................................................ 33
10. Datalogger Programming ........................................34
10.1 EC100() Instruction........................................................................... 34
10.2 EC100Configure() Instruction........................................................... 37
10.2.1 ConfigCmd 11 Zero-and-span Control ....................................... 39
10.2.2 ConfigCmd 18 Heater Voltage ................................................... 39
10.3 Example CRBasic Program............................................................... 40
11. Theory of Operation .................................................41
11.1 IRGASON Sonic Anemometer ......................................................... 41
11.1.1 Wind Speed ................................................................................ 41
11.1.2 Temperature ............................................................................... 42
11.2 IRGASON Gas Analyzer .................................................................. 43
11.3 Theory References............................................................................. 44
Appendices
A. Filter Bandwidth and Time Delay ..........................A-1
B. Equations................................................................B-1
C. Material Safety Data Sheets (MSDS) .....................C-1
C.1 Magnesium Perchlorate MSDS ....................................................... C-1
C.2 Decarbite MSDS ............................................................................. C-8
Figures
5-1. IRGASON dimensions, side view....................................................... 6
5-2. IRGASON dimensions, front view...................................................... 6
6-1. Exploded view of mounting the IRGASON........................................ 9
6-2. EC100-enclosure mounting bracket mounted on a vertical mast
(left) and a tripod leg (right) .......................................................... 10
6-3. Exploded view of mounting the EC100 enclosure ............................ 10
6-4. Mounting the IRGASON Temperature Probe ................................... 11
6-5. EC100 electronics front panel with enhanced barometer. At left,
as received from Campbell Scientific. At right, all wiring and
connections complete..................................................................... 12
6-6. Base of EC100 enclosure .................................................................. 13
6-7. Sensor connections to EC100............................................................ 13
7-1. Main window of ECMon software .................................................... 20
7-2. Setup window in ECMon .................................................................. 21
8-1. An example of USB data output in terminal mode............................ 23

Table of Contents
iii
9-1. Proper location of the sonic top wick (left) and bottom wick
(right)..............................................................................................26
9-2. PN 28902 CSAT3 Sonic Wick Spares Kit contents...........................26
9-3. Proper location of the gas analyzer top wick (left) and bottom
wick (right) .....................................................................................28
9-4. 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. ...............30
9-5. ECMon zero-and-span window..........................................................31
9-6. Replacing the desiccant and CO2 scrubber bottles ............................33
A-1. Frequency and amplitude response of EC100 filter at various
bandwidths................................................................................... A-2
A-2. Frequency response comparison of the EC100 10 Hz bandwidth
and a 50 ms moving average ....................................................... A-3
Tables
6-1. EC100 SDM Output to a Campbell Scientific CR1000, CR3000,
or CR5000 Datalogger....................................................................14
7-1. Factory Default Settings.....................................................................16
8-1. USB and RS-485 Output Elements ....................................................23
8-2. Multipliers and Offsets for Analog Outputs.......................................25
9-1. Rain Wick Replacement Parts............................................................27
10-1. Output Modes for EC100 Instruction.................................................35
10-2. Bits in the Sonic Diagnostic Flag.......................................................35
10-3. Bits in the Gas Diagnostic Flag..........................................................36
10-4. ConfigCmd Values for Setting and Retrieving Settings .....................38
A-1. Filter Time Delays for Various Bandwidths ................................... A-3
B-1. Table of Equation Variables and Constants .....................................B-1

Table of Contents
iv

1
IRGASON®Integrated CO2/H2O Open-
Path Gas Analyzer and 3D Sonic
Anemometer
1. Introduction
The IRGASON, U.S. Des. Patent No. D680455, is an in-situ, open-path, mid-
infrared absorption gas analyzer integrated with a three-dimensional sonic
anemometer. The gas analyzer provides measurements of absolute densities of
carbon dioxide and water vapor, while the sonic anemometer measures
orthogonal wind components.
Before using the IRGASON please study:
•Section 2, Precautions (p. 1)
•Section 3, Initial Inspection (p. 2)
•Section 6, Installation (p. 7)
More details are available in the remaining sections.
2. Precautions
•DANGER:
oThe scrubber bottles (see Section 9.5, Replacing Desiccant and
Scrubber Bottles (p. 32)) 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 IRGASON by the arms or the strut between the
arms. Always hold it by the block, where the upper and lower
arms connect.
oHandle the IRGASON 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.

IRGASON®Integrated CO2/H2O Open-Path Gas Analyzer and 3D Sonic Anemometer
2
oThe SDM, USB, and RS-485 output options include IRGASON
diagnostic data. Be aware that the absence of diagnostic data in
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 (p. 22)).
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, Gas-Analyzer
Window Cleaning (p. 28)).
3. Initial Inspection
Upon receipt of the IRGASON, inspect the packaging and contents for
damage. File damage claims with the shipping company.
4. Overview
The IRGASON is an in-situ, open-path, mid-infrared absorption analyzer
integrated with a three-dimensional sonic anemometer. The gas analyzer
provides measurements of absolute densities of carbon dioxide and water
vapor, while the sonic anemometer measures orthogonal wind components.
The IRGASON is measured and controlled by the EC100 electronics, which
synchronizes gas and wind data, essential for valid flux calculations using the
eddy-covariance method. The EC100 electronics also uses inputs from an
included temperature thermistor probe and a barometer. “IRGASON” and
“EC100” are often used interchangeably in this manual.
The IRGASON has been optimized for remote eddy-covariance- flux
applications, addressing issues of aerodynamics, power consumption, spatial
displacement, and temporal synchronicity. Specifically, its unique design
contains no obstructions surrounding the sample volume; it operates with only
5 Watts of power at room temperature; it has no spatial displacement between
the sample volumes of the gas analyzer and the sonic anemometer; and the
EC100 synchronously samples data from the gas analyzer and sonic
anemometer.
5. Specifications
5.1 Measurements
Features
•To compute carbon dioxide and water vapor fluxes using the eddy-
covariance method, the IRGASON measures:
oabsolute carbon dioxide
owater vapor densities
othree-dimensional wind speed
osonic air temperature
oair temperature
obarometric pressure

IRGASON®Integrated CO2/H2O Open-Path Gas Analyzer and 3D Sonic Anemometer
3
These measurements are required to compute carbon dioxide and water vapor
fluxes using the:
•Standard outputs:
oux, uy, and uzorthogonal wind components
osonic temperature (based on the measurement of c, the speed of
sound)
osonic diagnostic flags
oCO2density, H2O density
ogas analyzer diagnostic flags
oair temperature, air pressure
oCO2signal strength, H2O signal strength
oAir temperature and air pressure are auxiliary sensor inputs
Datalogger compatibility: CR6
CR1000
CR3000
CR5000
Measurement
Rate: 60 Hz
Output bandwidth2:5, 10, 12.5, or 20 Hz
Datalogger-prompted
output rate: 1 to 60 Hz
Output rate2:10, 25 or 50 Hz
Operating temperature: –30 to 50 °C
Gas analyzer
Measurement precision1
CO2 density: 0.2 mg·m–3 (0.15 µmol·mol–1)
H2O density: 0.00350 g·m–3 (0.006 mmol·mol–1)
Factory calibrated range
CO2:0 to 1000 µmol·mol–1
H2O: 0 mmol·mol–1 to 37 °C dewpoint
Analyzer temp: –30 to 50 °C
Baro pressure: 70 to 106 kPa
CO2performance
Zero max drift3:±0.55 mg·m–3·°C–1 (±0.3 μmol·mol·°C–1)
Gain Drift: ±0.1% of reading·°C–1 (maximum)
Sensitivity to H2O: ±1.1 x 10–4 µmol CO2·mol–1 H2O (max)
H2O performance
Zero max drift3:±0.037 g·m–3·°C–1 (±0.05 mmol·mol–1·°C–1)
Gain Drift: ±0.3% of reading·°C–1 (maximum)
Sensitivity to CO2:±0.1 mol H2O·mol–1 CO2 (maximum)
Sonic measurement precision4
ux:1 mm·s–1
uy:1 mm·s–1
uz:0.5 mm·s–1
Sonic temperature: 0.025 °C

IRGASON®Integrated CO2/H2O Open-Path Gas Analyzer and 3D Sonic Anemometer
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Sonic accuracy5
Offset error
ux, uy:< ±8 cm·s–1
uz:< 4 cm·s–1
Gain error
Wind vector ±5° horizontal: < ±2% of reading
Wind vector ±10° horizontal: < ±3% of reading
Wind vector ±20° horizontal: < ±6% of reading
Sonic reporting range
Full scale wind: ±65.553 m/s
Sonic temperature: –50 to 60 °C
Auxiliary sensors6
Barometer
Basic barometer
Accuracy
–30 to 0 °C: ±3.7 kPa at –30 °C, falling linearly to ±1.5
kPa at 0 °C
0 to 50 °C: ±1.5 kPa
Measurement rate: 10 Hz
Optional enhanced barometer:
Manufacturer: Vaisala
Model: PTB110
Accuracy
–30 to 0 °C: ±0.15 kPa
Measurement rate: 1 Hz
IRGASON temperature sensor:
Manufacturer: BetaTherm
Model: 100K6A1A Thermistor
Accuracy: ±0.15 °C (–30 to 50 °C)
1 noise rms, assumes:
o25 °C
o85 kPa
o14 g·m–3 H2O
o597 mg·m–3 CO2
o25 Hz bandwidth.
2 user selectable
3 –30 to 50 °C
4 noise rms
5 assumes:
o–30 to 50 °C
owind speed <30 m·s–1
oazimuth angles between ±170°
6 refer to manufacturer’s product brochure or manual for details

IRGASON®Integrated CO2/H2O Open-Path Gas Analyzer and 3D Sonic Anemometer
5
5.2 Output Signals
Features
•EC100 electronics outputs data using:
oCS SDM
oRS-485
oUSB
oAnalog out
Digital
SDM (Synchronous Device for Measurement)1
Data type: FLOAT
RS-485
Data type: ASCII
Output rate: 1 to 60 Hz
Baud rate: 1200 to 230400 bps
USB
Data type: ASCII
Output rate: 10, 20, or 60 Hz
Analog (two outputs for CO2and H2O densities)
Voltage range: 0 mV to 5000 mV
Resolution: 76 µV (16 bit)
Update rate: 60 Hz
Accuracy (at 25 °C): ±3 mV
CO2density equation: mg·m–3 = 0.38632·(mVout) – 102.59
Full scale range: –103 to 1829 mg·m–3
H2O density equation: g·m–3 = 0.00865·(mVout) – 2.26
Full scale range: –2 to 41 g·m–3
1Synchronous Device for Measurement. A Campbell Scientific, Inc. proprietary serial interface for
datalogger to peripheral and sensor communication. See Section 8.1, SDM Output (p. 22), for details.
2 user selectable
5.3 Physical Description
Optical path length: 15.37 cm (6.05 in)
Sonic path length: 10.0 cm
Sonic path angle from vertical: 30°
Spatial separation between gas analyzer and sonic volumes: 0 cm
Dimensions
IRGASON
Length: 51.5 cm (20.3 in)
Height: 31.1 cm (12.2 in)
Cable Length: 3 m (9.8 ft)
EC100 Enclosure: 24.1 x 35.6 x 14 cm (9.5 x 14.0 x 5.5 in)
Weight
IRGASON with Cable: 2.8 kg (6.1 lbs)
EC100 with Enclosure: 3.2 kg (7 lbs)

IRGASON®Integrated CO2/H2O Open-Path Gas Analyzer and 3D Sonic Anemometer
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FIGURE 5-1. IRGASON dimensions, side view
FIGURE 5-2. IRGASON dimensions, front view

IRGASON®Integrated CO2/H2O Open-Path Gas Analyzer and 3D Sonic Anemometer
7
5.4 Power Requirements During Power-up and Operation
Power requirement
Source: 10 to 16 Vdc
Load
at 25 °C: 420 mA
at 25 °C in power-down mode1:250 mA
1sonic anemometer fully powered and gas analyzer in stand-by
6. Installation
6.1 Orientation
During operation, the IRGASON should be leveled and pointed into the
prevailing wind to minimize flow distortions from the instrument arms and
other supporting structures. Leveling can be done using the leveling bubble on
top of the instrument block. In the proper orientation, the product label will
read right-side-up, with the upper arm (source) of the gas analyzer directly
above the lower arm (detector).
6.2 Mounting
The IRGASON is supplied with mounting hardware to attach it to the end of a
horizontal pipe with a diameter of 1.31 in., such as the Campbell Scientific
CM202, CM204, or CM206 crossarm. The following steps describe the normal
mounting procedure. Refer to FIGURE 6-1.
1. Secure the chosen crossarm to a tripod or other vertical structure using a
CM210 Crossarm-to-Pole Mounting Kit (pn 17767).
2. Point the horizontal arm into the direction of the prevailing wind and
tighten the nuts and bolts.
Do not carry the IRGASON by the arms or the strut
between the arms. Always hold it by the block, where
the upper and lower arms connect.
3. Bolt the IRGASON mounting bracket (pn 27496) to the CM250 Leveling
Mount (pn 26559) (see FIGURE 6-1).
4. Install the IRGASON to the mounting bracket by inserting the mounting
bolt and pin into the corresponding holes. Tighten the bolt. Make sure the
analyzer is vertically oriented so the label is right-side-up and the upper
arm (source) is directly above the lower arm (detector).
5. Mount the IRGASON assembly by fitting the boom adapter over the end
of the crossarm. Tighten the set screws on the boom adapter with a 3/16-
inch hex socket head wrench.
WARNING

IRGASON®Integrated CO2/H2O Open-Path Gas Analyzer and 3D Sonic Anemometer
8
Handle the IRGASON carefully. The optical source may
be damaged by rough handling, especially while the
analyzer is powered.
6. If the assembly is not level, slightly loosen the bolt that holds the
mounting bracket on the boom adapter and adjust the assembly until the
leveling bubble on top of the IRGASON block is within the bullseye.
Retighten the bolt.
7. Attach the EC100 enclosure to the mast, tripod leg, or other part of the
mounting structure. To do this, attach the EC100-enclosure mounting
bracket (pn 26604) to the pipe by loosely tightening the u-bolts around the
pipe. The u-bolts are found in the mesh pocket inside the EC100
enclosure. If the pipe does not run vertically (for example, if the enclosure
is being attached to a leg of a tripod), rotate the bracket to the side of the
pipe. The enclosure must hang upright. Make angle adjustments as needed
by loosening the four nuts and rotating the bracket plates relative to one
another. If the necessary angle cannot be achieved in the given orientation,
the four nuts may be removed and the top plate indexed by 90° to allow
the bracket to travel in the other direction (see FIGURE 6-2). Once
adjusted, tighten all the nuts. Finally, attach the EC100 enclosure to the
bracket by loosening the bolts on the back of the enclosure, hanging the
enclosure on the mounting bracket (it should slide into place and be able to
securely hang from the bracket), and tightening the bolts (see FIGURE
6-3).
WARNING