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Year: 2014

How to Prevent Negative Readings with LI-COR Light Sensors

How to Prevent Negative Readings with LI-COR Light Sensors

This tech tip helps to prevent mistakes that result in negative readings. When getting negative readings from your light sensor, check your multiplier, the connection between your light sensor and recorder/data logger, or the cable connection.

1. Did you enter the standard multiplier with a negative sign?

The Calibration Multiplier is always a negative number, because the shield of the coaxial cable of the sensor carries the positive signal instead of the negative signal. If you reverse the sign…

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Estimating Run Time of the LI-610 Portable Dew Point Generator

Estimating Run Time of the LI-610 Portable Dew Point Generator

The LI-610 dew point generator is an instrument designed for generating an air stream with a set dew point with very good accuracy (±0.2 °C for dew point between 0 and 50 °C). This instrument is primarily used for calibrating infrared gas analyzers and systems (e.g. LI-840A, LI-7200, LI-7500A, LI-6400XT, and LI-8100A). The LI-610 can generate a maximum flow rate of about 1.7 liters per minute. During typical use for calibration purposes the LI-610 is operated only for short intervals. …

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LI-COR Systems Selected for Nationwide Measurement of Evapotranspiration in China

LI-COR Systems Selected for Nationwide Measurement of Evapotranspiration in China

To better understand and control drought and water management for China’s 1.3 billion people, a Chinese research project selected LI-COR Biosciences and its eddy covariance system for nationwide use. The Chinese Ecosystem Research Network (CERN) is measuring a portion of the water cycle called evapotranspiration, a combination of evaporation and transpiration (from plants) on a large “ecosystem-wide” scale to provide insights into water-use efficiency, drought and water management issues.

An expansion…

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Protecting Your Cables

Protecting Your Cables

It is often necessary to lay cables and hoses on the ground when installing instrumentation at field sites. For short term deployments, this may not cause problems. For longer-term deployments, however, exposed cables or hoses at ground level are going to have problems. Damage can occur from ultraviolet radiation, submersion in standing water, gnawing by rodents or other small animals, or stepping on the cables when servicing the site.

It is quite easy to prevent these kinds of problems before…

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