LI-COR LI-800 User manual
CO
CO
CO
2Analyzer
Analyzer
Analyzer
®
Environmental Division
Instruction Manual
CO2Analyzer
ii
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.
© Copyright 1998, LI-COR, Inc.
Publication Number 9810-123
Printing History
New editions of this manual will incorporate all material since the previous editions. Update packages may be used between editions which
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
which are incorporated at reprint do not cause the date to change).
LI-COR, Inc. ●4421 Superior Street ●Lincoln, Nebraska 68504
Phone: 402-467-3576 ●FAX: 402-467-2819
Toll-free: 1-800-447-3576 (U.S. & Canada)
iii
Table of Contents
Section 1. General Description
What’s What................................................................................................................................................................................. 1-1
Features ........................................................................................................................................................................................ 1-3
Precautions ................................................................................................................................................................................... 1-3
Getting Started Tutorial ................................................................................................................................................................ 1-4
Section 2. Power On
Power On ...................................................................................................................................................................................... 2-1
Low Battery Indicator .................................................................................................................................................................. 2-1
Alarms .......................................................................................................................................................................................... 2-2
iv
Section 3. Operation
Installing the PC Communications Software on Your Computer ................................................................................................ 3-1
Setting the Communication Parameters ....................................................................................................................................... 3-2
Cabling ......................................................................................................................................................................................... 3-2
RS-232 Output .............................................................................................................................................................................. 3-2
Initial Setup................................................................................................................................................................................... 3-3
Configuration Window - Setting Operational Parameters............................................................................................................ 3-7
Controls ................................................................................................................................................................................. 3-8
Enable Heater ................................................................................................................................................................. 3-8
Pressure Compensation .................................................................................................................................................. 3-8
DAC Offset Enable ........................................................................................................................................................ 3-8
Span ....................................................................................................................................................................................... 3-10
Reset LI-800 .......................................................................................................................................................................... 3-10
Calibration Window - Setting the Zero and Span......................................................................................................................... 3-11
Record Window - Plotting Data .................................................................................................................................................. 3-13
Y-Axis Page........................................................................................................................................................................... 3-14
X-Axis Page........................................................................................................................................................................... 3-14
Sampling Page ....................................................................................................................................................................... 3-16
Plot Page................................................................................................................................................................................ 3-18
Log File Page......................................................................................................................................................................... 3-19
Analog Output .............................................................................................................................................................................. 3-21
Converting Current Output to ppm CO2............................................................................................................................... 3-24
Using the Terminal Strip .............................................................................................................................................................. 3-25
Connecting the GasHound to the LI-1400 Data Logger............................................................................................................... 3-27
v
Section 4. Theory of Operation
System Overview.......................................................................................................................................................................... 4-1
Optical Bench System .................................................................................................................................................................. 4-2
Section 5. Maintenance
Cleaning the Optical Bench .......................................................................................................................................................... 5-1
Changing the Optical Bench ........................................................................................................................................................ 5-5
Changing the Fuse ........................................................................................................................................................................ 5-7
Appendix A. Specifications
Appendix B. Pin Assignments
Appendix C. List of Suppliers
Warranty
General Description 1-1
General Description
What's What
This procedure should be followed if you have just taken delivery of your
LI-800. Check the packing list to verify that you have received everything that was ordered
and that you have also received the following items:
●RS-232 Cable - (Part #392-04993), used to connect the LI-800 to your computer.
●800-50 Data Communications Software - This Windows® 95 and Windows® NT com-
patible software is used to communicate with your computer. The software is provided
on CD. A complete description of this software can be found in Section 3, Operation.
Section 1
1-2 General Description
●Standard Spare Parts Kit (9980-012) - This kit contains replacement parts for your
LI-800. As you become familiar with the analyzer you will learn which items to keep
close at hand and which items can be stored away. The spare parts kit contains these
items:
Description Qty.LI-COR Part No.
Polyurethane Mounting Feet 4 234-02268
Mounting Screws 4 149-02610
Bev-a-line Tubing 12' 222-01824
Disposable Air Filter 2 300-01961
Quick Connect Unions 2 300-03123
1.6A Fuse 2 439-04537
Cleaning Kit, includes: 1 9980-013
3" Cleaning Swabs 5 610-05314
5" Cleaning Swabs 5 610-05315
O-Rings 4 192-00226
Pre-formed Optical Bench Tubing 4 6580-010
Section 1
General Description 1-3
Features
The LI-800 is an economical high performance, non-dispersive infrared gas analyzer designed
to be used for a wide variety of applications. Some of the LI-800's important features include:
●Optional short (2") and standard long (5.5") interchangeable optical benches can be used
to obtain resolutions of 0-20000 ppm and 0-2000 ppm, respectively. No changes in
calibration polynomials or software need to be made when swapping optical benches.
●Optical benches are fully serviceable by the user; cleaning the optical benches is a simple
process, and does not affect the instrument calibration.
●Simple Windows®software provides for easy user calibration and data output.
Precautions
●The optical bench is maintained at a constant 50 °C. Avoid direct exposure to sunlight or
extremely high temperatures that may elevate the temperature inside the LI-800 case.
●The optical source is sensitive to vibration, and can be damaged by strong vibrations or
jarring. Do not drop the LI-800, or expose it to severe mechanical shock.
●Do not use abrasive cleansers when cleaning the optical bench, as damage to the gold
plating may result. Instructions for cleaning the optical bench can be found in Section 5.
●Always filter air entering the LI-800. A Gelman polypropylene filter is included in the
spares kit.
Section 1
1-4 General Description
Getting Started Tutorial
The following section briefly covers the basic steps you might follow to set up the LI-800 to
collect and record data. Many of these steps are described in greater detail throughout this
manual.
1Install the 800-50 PC Communications Software.
This software is required for setting the zero and span of the LI-800 and for setting up data
communication and data transfer parameters. Installation instructions can be found in Section
3, Installing the Software on Your Computer.
2Determine your jumper settings for analog output (if desired) and
high and low alarm output, if required.
There are 4 jumpers inside the LI-800 case (on the main circuit board), two of which
determine the voltage output ranges on the terminal strip (position #9), and the other two,
which toggle the high and low alarm output between 0-5V (TTL levels) and an open drain
condition.
The default jumper positions are set for 0-5V analog output and 0-5V output for both high and
low alarms. This alarm configuration is suitable for logic devices such as dataloggers. To use
the high and/or low alarms to operate a relay switch, the jumpers should be reconfigured for
open drain output. See Section 2, Alarms, for a description of how to change the alarm
jumper settings; see Section 3, Analog Output, for a description of the voltage output jumpers.
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