LI-COR LI-870, Using Manual

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Section 1. Overview of the LI-870
The LI-870 measures CO
2
in 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 CO
2
Flux System, LI-830 and LI-850 CO
2
and CO
2
/H
2
O Gas Analyzers, and
LI-COR eddy covariance analyzers. Water vapor measurements are used in cor-
rections to report CO
2
concentrations with high accuracy. Power to the LI-870 is
supplied from the Smart Chamber or LI-8250 Multiplexer. The LI-870, in turn,
provides CO
2
data 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:
l
Sealed USB-A to USB-B cable (part number 392-17654).
l
Sealed 2.5 × 5 mm IP68 power cable (part number 9982-008).
l
Two 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