LI-COR LI-870 Mode d’emploi

Using the LI-870

CO2/H2O Analyzer

Using the LI-870

CO2/H2O Analyzer

LI-COR Biosciences

4647 Superior Street

Lincoln, Nebraska 68504

Phone: +1-402-467-3576

Toll free: 800-447-3576 (U.S. and Canada)

envsales@licor.com

Regional Offices

LI-COR Biosciences GmbH

Siemensstraße 25A

61352 Bad Homburg

Germany

Phone: +49 (0) 6172 17 17 771

envsales-gmbh@licor.com

LI-COR Biosciences UK Ltd.

St. John’s Innovation Centre

Cowley Road

Cambridge

CB4 0WS

United Kingdom

Phone: +44 (0) 1223 422102

envsales-UK@licor.com

LI-COR Distributor Network:

www.licor.com/env/distributors

Notice

The information 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 held 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.

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property of their respective owners.

Printing History

Publication number: 984-17878

Created on: Monday, February 22, 2021.

iii

Notes on Safety

This LI-COR product has been designed to be safe when operated in the manner described in this manual. The safety of

this product cannot be assured if the product is used in any other way than is specified in this manual. The product is

intended to be used by qualified personnel. Read this entire manual before using the product.

Equipment markings:

The product is marked with this symbol when it is necessary for you to refer to the manual or

accompanying documents in order to protect against injury or damage to the product.

The product is marked with this symbol when a hazardous voltage may be present.

The product is marked with this symbol if a Chassis Ground connection is required.

The product is marked with this symbol to indicate that a direct current (DC) power supply is

required.

WARNING Warnings must be followed carefully to avoid bodily injury.

CAUTION Cautions must be observed to avoid damage to your equipment.

Manual markings:

Warning Warnings must be followed carefully to avoid bodily injury.

Caution Cautions must be observed to avoid damage to your equipment.

Note Notes contain important information and useful tips on the operation of your equipment.

CE Marking:

This product is a CE-marked product. For conformity information, contact LI-COR Support at envsupport@licor.com.

Outside of the U.S., contact your local sales office or distributor.

California Proposition 65 Warning

WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other

reproductive harm.

Federal Communications Commission Radio Interference Statement

WARNING: This equipment generates, uses, and can radiate radio frequency energy and if not installed in accordance

with the instruction manual, may cause interference to radio communications. It has been tested and found to comply

with the limits for a Class A computing device pursuant to Subpart J of Part 15 of FCC rules, which are designed to

provide a reasonable protection against such interference when operated in a commercial environment. Operation of this

equipment in a residential area is likely to cause interference in which case the user, at his own expense, will be required

to take whatever measures may be required to correct the interference.

Waste Electronic and Electrical Equipment (WEEE) Notice

This symbol indicates that the product is to be collected separately from unsorted municipal waste. The fol-

lowing applies to users in European countries: This product is designated for separate collection at an

appropriate collection point. Do not dispose of as household waste. For more information, contact your

local distributor or the local authorities in charge of waste management.

Contents

Section 1. Overview of the LI-870

What's what 1-1

LI-870 CO2/H2O Analyzer 1-1

LI-870 cable and tube assembly 1-2

Shoulder strap 1-2

Split ring assembly 1-2

Spares kit 1-3

Software 1-3

Section 2. Using the LI-870

Connecting the cable assembly 2-1

Powering the analyzer and making measurements 2-3

Identifying the LI-870 serial number 2-3

Storing the LI-870 2-5

Section 3. Troubleshooting

Smart Chamber or LI-8250 software not recognizing LI-870 3-1

Unable to Zero or Span the Instrument 3-2

Instrument Reports -50 ppm CO2 or Measurements Jump Around 3-2

Section 4. Maintenance

Cleaning the optical bench 4-1

Connecting to LI-870 for calibration 4-4

User calibration 4-5

Setting the H2O zero and spans 4-6

Setting the CO2 zero 4-6

Setting the primary CO2 span 4-7

Setting the secondary CO2 span 4-8

Recovering from a bad zero or span 4-8

Appendix A. Specifications

General A-1

CO2 Measurements A-1

H2O Measurements A-1

Appendix B. Equations summary

Appendix C. Warranty

Section 1.

Overview of the LI-870

The LI-870 is a CO2/H2O Gas Analyzer that is designed for use with the Smart

Chamber and LI-8250 Multiplexer in soil gas flux systems. This document provides

basic operating instructions for the LI-870. Refer to the Smart Chamber and LI-

8250 manuals for additional information.

What's what

If you have just taken delivery of your LI-870, check your packing list to ensure the

following items have been included.

LI-870 CO2/H2O Analyzer

Part number:

870-01.

The LI-870 is a portable gas analyzer designed for use with the Smart Chamber or

LI-8250 Multiplexer for soil CO2flux measurements.

1-1Using the LI-870 CO₂/H₂O Analyzer

Section 1. Overview of the LI-870

The LI-870 measures CO2in air at concentrations from 0 to 20,000 ppm using

non-dispersive infrared gas analysis technology. This technology is well-established

in other LI-COR products, including the widely-published LI-8100A Automated

Soil CO2Flux System, LI-830 and LI-850 CO2and CO2/H2O Gas Analyzers, and

LI-COR eddy covariance analyzers. Water vapor measurements are used in cor-

rections to report CO2concentrations with high accuracy. Power to the LI-870 is

supplied from the Smart Chamber or LI-8250 Multiplexer. The LI-870, in turn,

provides CO2data to the Smart Chamber or LI-8250 Multiplexer for storage and

processing.

LI-870 cable and tube assembly

Part number:

9982-010.

A 1.2 meter cable and tubing assembly is included with the LI-870 to connect the

LI-870 with the Smart Chamber or LI-8250 Multiplexer. This assembly includes:

lSealed USB-A to USB-B cable (part number 392-17654).

lSealed 2.5 × 5 mm IP68 power cable (part number9982-008).

lTwo lengths 1.2 meter 1/4" Bev-A-Line® tubing (part number 222-01824) with

quick-connect fittings (part numbers 300-07124 (male) and 300-07125

(female)).

The assembly components are zip tied in plastic conduit.

Shoulder strap

Part numbers:

604-18146

The shoulder strap is to carry the LI-870.

Split ring assembly

Part number

9882-019

The LI-870 ships with a split ring and standoff assembled for attaching the

shoulder strap. The rings are attached near the clasps of the case. Each assembly

consists of a machined standoff (part number 9882-019), screw (part number 122-

07715), split ring (part number 610-10353), and two washers (part number 167-

00154).

1-2 Using the LI-870 CO₂/H₂O Analyzer

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