Introduction to the instruments
The LI-830 and LI-850 gas analyzers both measure CO2 in air at concentrations from 0 to 20,000 ppm. The instruments differ in that the LI-850 measures water vapor in air, but the LI-830 does not. As a consequence of the water vapor measurement, the LI-850 is able to measure CO2 concentrations with greater accuracy than the LI-830. Regardless of this difference, operating both instruments is essentially the same. This document provides basic operating instructions for the analyzers.
Online resources
In addition to the contents of your box, you may be interested in the following resources.
Application software
The software used to interact with the instrument is available for both Windows® and macOS® operating systems. It is used to configure the instrument, read measurements, and configure data logging to a computer. For Windows 7 and 8, the device drivers must be installed manually before you can connect with the instrument. Software is available from licor.com/830-850-support.
Integrator's guide
The Integrator's Guide describes how to control the instrument using a terminal program and read data in a command-line interface.
Instruction manual
A .pdf version of this document can be downloaded to your computer.
What's what
The LI-830 and LI-850 include a core set of components and each may include optional components. These are described below.
Gas analyzer
This is the gas analyzer in an enclosure. It may include an optional built-in pump and display.
- Power indicator: Illuminates when the instrument is powered on.
- Low Battery indicator: Illuminates if the power supply voltage drops below 10.5 volts. The instrument will continue to operate with a low battery, but expect a corresponding decline in performance.
- Alarm indicators illuminate if an alarm threshold has been crossed. See Using alarms.
- RS-232 Serial and USB connectors to connect with a computer or serial device.
- Air Inlet and Air Outlets are shipped with covers in place. Keep the covers so you can put them back over the ports when the analyzer is not in use.
- Power In: Compatible with 12 to 30 VDC power supplies.
- The Terminal Strip has another power connector and outputs for alarms and digital-to-analog converters (DAC).
Accessories kit
Part Number 9980-065
The instrument includes a standard accessories kit, which has accessories and some replacement parts for your gas analyzer. The accessories kit includes the following components:
| Description | Quantity | Part Number |
|---|---|---|
| Universal power supply; Input: 100 to 240 VAC, 50 to 60 Hz; Output: 12 VDC, 2.5 amps | 1 | 591-19495 |
| Outlet adapter kit for universal power supply | 1 | 591-13033 |
| USB cable; Standard 1.8 m USB-A to USB-B1 | 1 | 392-06652 |
| RS-232 null modem, cross-over cable kita | 1 | 9975-016 |
| 14-pin terminal block; Includes label sticker (250-05340) | 1 | 331-05273 |
| Tube fitting nuts for air inlet and outlet | 2 | 9861-036 |
| Bev-a-line IV plastic tubing; 3.6 meter roll | 1 | 222-01824 |
| Air filters | 2 | 9967-008 |
| Quick-connect straight unions | 2 | 300-03123 |
| Cleaning kit | 1 | 9980-066 |
| 3" Source and detector cleaning swabs | 5 | 610-05314 |
| 5" Optical path cleaning swabs | 5 | 610-05315 |
| O-Rings (AS-018 Nitrile 70) | 4 | 192-00226 |
| Black polyurethane feet | 4 | 234-02268 |
Air pump (optional)
An optional air pump is available for the gas analyzer. The pump (if applicable) is installed in the gas analyzer case. If you want to add a pump, you can order one later.
Display (optional)
An optional display is available. The display shows CO2 concentration, H2O concentration (LI-850 only), bench temperature, and pressure.