LI-COR LI-7700 User manual

LI-7700
Open Path CH4 Analyzer
Instruction Manual

LI-7700
Open Path CH4Analyzer
Instruction Manual
LI-COR, Inc.
4647 Superior Street
P.O. Box 4425
Lincoln, NE 68504-0425
Telephone: [phone]
FAX: [phone]
Toll Free: 1-800-447-3576 (U.S. & Canada)
Email: [email protected]
[email protected]
www.licor.com
®

ii
LI-COR, inc.
Environmental
4647 Superior Street
P.O. Box 4000
Lincoln, Nebraska 68504 USA
Phone: [phone]
FAX: [phone]
Information: 1-800-447-3576 (Toll-free U.S. & Canada)
E-mail: [e-mail]
Manufacturer’s Name: LI-COR, Inc.
Manufacturer’s Address: 4647 Superior Street
Lincoln, Nebraska USA 68504
declares that the product
Product Name: Open Path CH
4
Gas Analyzer
Model Number(s): LI-7700
Product Options: None
conforms to the following Product Specifications:
Supplementary Information:
The product herewith complies with the requirements of the EMC Directive 2004/108/EC.
John Rada
Director of Engineering
Declaration of Conformity
EMC: EN 55011 : 2002 Radiated Emissions, Class A
IEC 61000-4-2 : 2000 ESD, 4KV/8KV Contact/Air
IEC 61000-4-3 : 2002 Radiated RF Immunity, 10V/m
IEC 61000-4-4 : 2004 EFT/Burst
IEC 61000-4-6 : 2003 Conducted RF Immunity, 3V
IEC 61000-4-5 : 2000 Surge Immunity, 1KV
Document #53-11453
February 9, 2010
®

iii
NOTICE
The information contained in this document is subject to change without notice. LI-COR MAKES NO
WARRANTY OF ANY KIND WITH REGARD TO THIS MATERIAL, INCLUDING, BUT NOT
LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE. LI-COR shall not be liable for errors contained herein or for incidental or
consequential damages in connection with the furnishing, performance, or use of this material.
This document contains proprietary information, which is protected by copyright. All rights are reserved.
No part of this document may be photocopied, reproduced, or translated to another language without
prior written consent of LI-COR, Inc.
The LI-7700 is covered by U.S. patents, patents pending, foreign equivalents, and Austrailian patent
AU2009292601.
LI-COR has licensed certain aspects of the LI-7700 that were developed with expertise from Southwest
Sciences, Inc. (Santa Fe, NM). This project was funded in part by the US Department of Energy through a
Small Business Innovation Research grant (DE-FG02-05ER84283).
Microsoft® and Windows® are registered trademarks of Microsoft Corporation. Eurofast® is a registered
trademark of Turck, Inc. All other trademarks are property of their respective owners.
LI-COR, Inc. ●4647 Superior Street ●P.O. Box 4425 ●Lincoln, Nebraska 68504
Phone: [phone] ●FAX: [phone]
Toll-free: 1-800-447-3576 (U.S. & Canada)
[email protected] ●www.licor.com
Printing History
New editions of this manual will incorporate all material since the previous editions. Update packages may
be used between editions that contain replacement and additional pages to be merged into the manual by
the user. The manual printing date indicates its current edition. The printing date changes when a new
edition is printed. (Minor corrections and updates that are incorporated at reprint do not cause the date to
change).
© Copyright 2011, LI-COR, Inc.
Publication No. 984-10751
1st Printing – February 2010
2nd Printing – October 2010; Revised March, 2011

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Notes on Safety
This LI-COR product was designed to be safe when operated in the manner described in this manual. The
safety of the product cannot be guaranteed if the product is used in any other way than is specified in this
manual.
Equipment markings:
The LI-7550 is marked with this symbol for a chassis ground connection.
Manual markings:
Warning: Warnings are to warn about the possibility of minor injury to yourself or others.
Caution: Cautions must be observed in order to prevent damage to your equipment.
Important: Important indicates information that will help prevent procedural mistakes in the
operation of the equipment or related software. Failure to comply may result in poor
experimental outcomes but will not cause bodily injury or equipment damage.
Note: Notes contain important information and useful tips on the operation of your
equipment.

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Table of Contents
Welcome… ................................................................................................................. x
1General Information 1-1
Overview of the LI-7700........................................................................................... 1-1
What’s What ............................................................................................................ 1-2
The LI-7700 Open Path CH4Analyzer ...................................................................... 1-2
Spares Kit and Cables ............................................................................................... 1-3
7550-101 Auxiliary Sensor Interface (optional) ......................................................... 1-5
Sonic Anemometer Interface Cables (optional).......................................................... 1-5
LI-7550 Analyzer Interface Unit (optional) ................................................................ 1-6
LI-7700 Components and Connections..................................................................... 1-7
Basic Setup............................................................................................................... 1-9
Install the LI-7700 Computer Software ...................................................................... 1-9
Power On ................................................................................................................. 1-9
Connect the Ethernet Data Cable ............................................................................ 1-10
Launch the Software and Connect to an LI-7700..................................................... 1-11
Mirrors - Cleaning and Care ................................................................................... 1-12
2

Operation 2-1

Introduction to the LI-7700 Interface Software .......................................................... 2-1

Main View................................................................................................................ 2-1

Tool Bar .................................................................................................................... 2-2

Settings Bar ............................................................................................................... 2-3

Charting Pages .......................................................................................................... 2-3

Charting.................................................................................................................... 2-4

Configuring the LI-7700............................................................................................ 2-6


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PC/Network Data Logging (Ethernet Output) .............................................................2-6
Logging Status Columns ............................................................................................ 2-7
Splitting Files............................................................................................................. 2-7
Operating Temperature Range .................................................................................. 2-8
Manual Controls .......................................................................................................2-9
Configuring Mirror Heater Controls......................................................................... 2-10
Configuring the Spin Motor Control ........................................................................ 2-12
Instrument Name and Address ................................................................................ 2-15
Setting the Time ...................................................................................................... 2-16
Output Rate ............................................................................................................ 2-18
Configuration Files .................................................................................................. 2-19
Creating an Instrument Configuration File ............................................................... 2-19
Implementing a Configuration File .......................................................................... 2-19
LI-7700 Analog Inputs ............................................................................................ 2-20
Auxiliary Sensor Interface Terminals (Option 1) ......................................................2-21
Connecting Sensors to the Auxiliary Sensor Interface ..............................................2-23
Thermocouple Inputs .............................................................................................. 2-24
Configuring Auxiliary Inputs (LI-7700)..................................................................... 2-25
Deploying the LI-7700 and Accessories.................................................................. 2-27
Mounting the LI-7700 ............................................................................................. 2-27
Vibrations ............................................................................................................... 2-27
Positioning the LI-7700 ........................................................................................... 2-28
Grounding .............................................................................................................. 2-29
Mounting the 7550-101 Auxiliary Sensor Interface..................................................2-29
Attaching the Mirror Cleaner/Washer Assembly ...................................................... 2-30
Mounting the Washer Reservoir ..............................................................................2-31
3Operation with the LI-7550 Analyzer Interface Unit 3-1
Introduction to the LI-7550....................................................................................... 3-1
What’s What ............................................................................................................ 3-2

Spares Kit and Cables................................................................................................ 3-2

Cable Connections.................................................................................................... 3-4

Basic Setup............................................................................................................... 3-6

Power On .................................................................................................................3-6

Connecting to the LI-7700 and LI-7550 (Ethernet) .....................................................3-6

Getting an LI-7700 to talk to an LI-7550....................................................................3-7

Using an LI-7700 with an LI-7500A or LI-7200 CO2/H2O Analyzer...........................3-9

Connecting to the LI-7700 and LI-7550 (RS-232 Serial) ........................................... 3-11


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Using the LI-7550................................................................................................... 3-12
USB Data Logging .................................................................................................. 3-12
About USB Devices................................................................................................. 3-14
USB Storage Capacity ............................................................................................. 3-14
Analog Inputs (LI-7550) .......................................................................................... 3-15
Auxiliary Sensor Interface Terminals (Option 2) ...................................................... 3-16
Electrical Connections............................................................................................. 3-18
Analog Input Time Delays....................................................................................... 3-19
LI-7550 Clock......................................................................................................... 3-20
LI-7550 Outputs ..................................................................................................... 3-21
Ethernet .................................................................................................................. 3-21
SDM ....................................................................................................................... 3-21
RS-232.................................................................................................................... 3-25
Analog.................................................................................................................... 3-26
Analog Output Time Delays.................................................................................... 3-27
Analog Output Hardware Configuration (Option 3)................................................. 3-27
Mounting the LI-7550 Analyzer Interface Unit........................................................ 3-29
4Data Files 4-1
File Header............................................................................................................... 4-1
Data ......................................................................................................................... 4-2
Diagnostics Header .................................................................................................. 4-4
Status Columns......................................................................................................... 4-6
5Making Flux Measurements with the LI-7700 5-1
Computing Fluxes..................................................................................................... 5-2
Example Calculation................................................................................................. 5-5
Full Computation ...................................................................................................... 5-5

Simplified Computation ............................................................................................ 5-7

Finding Multipliers.................................................................................................... 5-8

Low Resolution Look-up Tables ................................................................................ 5-8

Parametric Equations............................................................................................... 5-11

High Resolution Digital Tables................................................................................ 5-14

Zero Flux Validation............................................................................................... 5-19

References.............................................................................................................. 5-20
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6Theory and Equation Summary 6-1
Absorption of Infrared Radiation by a Gas ................................................................ 6-1
Temperature Dependence of Absorption Line Strength.............................................. 6-2
Line Broadening Mechanisms ...................................................................................6-2
Wavelength Modulation Spectroscopy ..................................................................... 6-4
Compensating for Temperature and Pressure Changes .............................................. 6-5
Compensating for Water Vapor: Equivalent Pressure, Pe............................................ 6-7
Derivation of Multipliers for Flux Measurements ...................................................... 6-9
References.............................................................................................................. 6-14
7Advanced Operation 7-1
Calibration ............................................................................................................... 7-1
Diagnostics .............................................................................................................. 7-3
Laser Temperature Control ........................................................................................ 7-3
Opening the Laser Temperature Control Dialog ........................................................ 7-4
Manual Line Lock Example ....................................................................................... 7-5
Re-enabling Automatic Line Lock.............................................................................. 7-7
Networking .............................................................................................................. 7-7
Enabling IPv6 on Windows XP .................................................................................. 7-7
The LI-7700 Finder Application................................................................................ 7-8
Communications Grammar .................................................................................... 7-14
Introduction ............................................................................................................7-14
LI-7700 Communications........................................................................................ 7-14
Element Descriptions ..............................................................................................7-15
Grammar ................................................................................................................7-15
Configuration File Grammar.................................................................................... 7-21
Sending Commands ................................................................................................ 7-24
8

Appendices 8-1

Appendix A. Specifications....................................................................................... 8-1

LI-7700 Open Path CH4Analyzer ............................................................................. 8-1

7700-101 Washer Assembly .....................................................................................8-2

LI-7550 Analyzer Interface Unit (optional) ................................................................8-2

7550-101 Auxiliary Sensor Interface (optional)..........................................................8-2

Power Requirements Summary..................................................................................8-3


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Appendix B. Maintenance ........................................................................................ 8-4
Changing the Internal Desiccant Bottle ..................................................................... 8-4
Changing the Thermocouple..................................................................................... 8-6
Changing the LI-7700 Fuse ....................................................................................... 8-7
Changing the LI-7550 Fuse ....................................................................................... 8-7
Appendix C. Troubleshooting ................................................................................... 8-8
Appendix D. Suppliers............................................................................................ 8-11
Chemical Sources ................................................................................................... 8-11
Calibration Gases ................................................................................................... 8-12
Turck® Cables........................................................................................................ 8-13
Industrial Rated USB Flash Drives........................................................................... 8-14
Mounting Hardware ............................................................................................... 8-14
Warranty
Index