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Category: LI-7000

Zero and Span Gas Guidelines

Zero and Span Gas Guidelines

LI-COR technical support often receives questions about choosing a set of CO2 calibration gases for our analyzers.   While we realize that every customer’s measurement situation may be slightly different, we do have a few suggestions for selecting a set of calibration gases.

We recommend having a zero gas, or the equipment to perform a chemical zero at the very least.  A zero gas is best if the gas is really CO2-free.   It’s not necessary to purchase pure nitrogen or argon…

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Obtaining Calibration Coefficients for Your LI-COR Gas Analyzer(s) Online

Obtaining Calibration Coefficients for Your LI-COR Gas Analyzer(s) Online

The calibration coefficients for LI-COR gas analyzers are factory installed, or may be re-entered if the instrument is returned for service at LI-COR. If the original calibration certificate that was sent with the instrument is misplaced, you can get a copy of it from LI-COR’s technical support web page by following these steps:

1. Go to http://www.licor.com/env/support/ and scroll down until you see the following:

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LI-COR Analyzers Monitoring Carbon Dioxide Worldwide as Atmospheric Levels Reach 400 parts per million

LI-COR Analyzers Monitoring Carbon Dioxide Worldwide as Atmospheric Levels Reach 400 parts per million

On May 13, the National Oceanic and Atmospheric Administration (NOAA) reported a preliminary daily average carbon dioxide (CO2) reading of 400.07 parts per million (ppm) at the Mauna Loa Observatory on the Big Island of Hawaii.

On May 9, a reading over 400 ppm was reported at the site for the first time ever. But that reading (400.03 ppm) was later revised to 399.89 ppm. The first CO2 measurement at the observatory was 313 ppm in 1958. According to the…

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An Often-Overlooked Constraint to Powering Instruments: Voltage Drop

An Often-Overlooked Constraint to Powering Instruments: Voltage Drop

LI-COR occasionally receives an inquiry from users who are concerned that after fielding their instrument for the first time it has failed. When they tested the instrument in the lab everything worked fine. After they connected it to the power supply in the field, however, the instrument would not start up. After checking that the connections were made with the correct polarity, the fuses are OK and that the power supply is outputting something nominally close to 12…

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Troubleshooting Ethernet Connectivity Issues with LI-COR Gas Analyzers

Troubleshooting Ethernet Connectivity Issues with LI-COR Gas Analyzers

Newer generations of LI-COR gas analyzers are Internet Protocol (IP) enabled devices that enable remote connectivity over wired or wireless networks. Below are some tips to troubleshoot Ethernet connectivity issues when connecting to an instrument directly through Ethernet or over a network.

1.  Using a wired and a wireless network at the same time can make it difficult for the computer to find a device, because it is on two different networks at the same time.  The wireless connection in…

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