The direct measurement of evapotranspiration hasn’t been widely performed because of the cost and complexity of measurement methods. Indirect methods rely on estimates based on crop coefficients and reference or potential evapotranspiration, which leads to uncertainty.
The LI-710 measures actual evapotranspiration—water vapor moving out of the field and into the atmosphere—without the need for crop coefficients. It works over any relatively flat and uniform ground cover at field or ecosystem scale.
A comparison of the LI-710 to traditional eddy covariance and Penman-Monteith Estimates shows that the LI-710 reports evapotranspiration with the accuracy of traditional eddy covariance.
The LI-710 applies the eddy covariance method to measure vertical wind and water vapor concentration at 10 Hz, then provides fully processed results every 30 minutes.
The LI-710 Evapotranspiration Sensor gives you answers—no data processing is necessary. From mounting to output, it is designed for ease-of-use.
Attach it to a simple pole—no tower or tripod needed—and it is compatible with NuRail® and other commonly used mounting hardware.
Its 1.5 W power requirement means you only need a battery and small solar panel to run it.
SDI-12 output from a single cable makes it easy to collect data and integrate the sensor into existing infrastructures.
It requires no calibration and is low maintenance.
With the LI-710, you get high-quality evapotranspiration measurements for a fraction of the cost of more complex direct measurement methods. You can deploy multiple sensors to expand your data collection footprint. You don’t need to hire a data analyst, and it has low ongoing power and maintenance costs.
The LI-710 measures evapotranspiration at the field scale as accurately as traditional eddy covariance systems, but there are differences.
The LI-710 is a straightforward solution if you want to directly measure water vapor moving from the field into the atmosphere. However, if you want to measure CO2 flux, integrate other sensor inputs, or process raw data, you’ll want a complete eddy covariance system.
Which is right for you—the LI-710 Evapotranspiration Sensor or a traditional eddy covariance system? The table below compares the two.
|Measures actual evapotranspiration||Yes||Yes|
|Measures at the field scale||Yes||Yes|
|Measures CO2 flux||No||Yes|
|Allows customized data processing||No||Yes|
|Provides raw data||No||Yes|
|Integrates other sensor inputs||No||Yes|
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