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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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Just a Reminder – Calibration Data Available Online

Just a Reminder – Calibration Data Available Online

Did you know that you can download calibration data for several LI-COR instruments online?  Calibration certificates for all light sensors, gas analyzers (LI-840/A, LI-7500/A, LI-7200, LI-7000) and the LI-6400/XT Portable Photosynthesis System can be accessed here.  To download an electronic copy of your calibration certificate, which includes the calibration constants and applicable multipliers, find the box called ‘Calibration Data’ on the right-hand side panel of the technical support page, enter your serial number (including the appropriate…

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Pyranometer Calibration Season

Pyranometer Calibration Season

The LI-200 Pyranometer Calibration schedule will be reaching its annual suspension on October 1st, 2012 and continuing through until February 28th, 2013.

LI-COR encourages our customers to return their LI-200 Pyranometer Sensors for recalibration (suggested every 2 years after field deployment) between the months of March and September. Why? Because pyranometer sensors need to be calibrated outdoors in natural sunlight in order to construct an accurate relationship between the output of each sensor and incoming solar radiation. During LI-COR’s 40…

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Recovering from a bad zero or span; how to undo your doings.

Recovering from a bad zero or span; how to undo your doings.

The LI-7700 is an inherently stable laser-based analyzer that requires minimal user calibration during normal use. User calibrations can still be performed to validate instrument performance, and are required when changing the instrument from its warm to cold temperature operating range. The possibility does exist, however, to perform an incorrect user calibration, which will have undesirable effects on instrument performance.  The instrument software provides multiple ways to help prevent, and even undo, a bad user calibration to ensure high quality…

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