The LIR, manufactured by LI-COR, is a silicon pyranometer that accurately Calibrated against an Eppley precision spectral pyranometer (PSP) for the. CR23X, or CR7 datalogger to an EPPLEY Precision Spectral Pyranometer (PSP). The. PSP is a high quality pyranometer used for extremely accurate solar. Eppley PSP The Eppley Precision Spectral Pyranometer (PSP) is a World Meteorological Organization First Class Radiometer, designed for the measurement of.

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Generally, pyranometers are installed horizontally.

Accurate, Versatile Compatible with most Campbell Scientific data loggers. The temperature eppely the collector red dot rises in an uncontrolled way. We have designed and built our own electronic circuitry needed to use the temperature sensors.

Global Precision Pyranometer

The pyranometer at the back was lacking its screen when we acquired it. The amplifier, assembled according to the schematics described by Harrison and Knight is shown below. Because of the thermopile characteristics the instruments could be small, light, low cost, have a continuous voltage output signal, and not require any external electrical power or control systems. Our site was heavily inspired by the technical solutions and programs designed by Tim Bitson.

The LIR measures incoming solar radiation with a silicon photovoltaic detector mounted in a cosine-corrected head. The thermopile provides a very low voltage, which must be amplified in order to be measured. The data acquistion system has changed several times. We also have an Eppley pyranometer and an Apogee pyranometer. The LIR, manufactured by LI-COR, is a silicon pyranometer that accurately monitors sun plus sky radiation for solar, agricultural, meteorological, and hydrological applications.


The detector outputs current; a shunt resistor in the sensor cable converts the signal from current to voltage, allowing the LIR to be measured directly by Campbell Scientific data loggers. The following shows notable compatibility information.

Dallas devoted a team of talented engineers to TINI. The collector consists of 30 glass vacuum tubes, each containing a black metal plate which absorbs solar radiation. The higher refractive index further improves the directional response and better thermal conductivity than glass provides other performance benefits.

Two hemispheres of Schott glass transparent to a wide range of wavelengths protect the black surface of the thermopile elements and reduce the amount of heat transfer between the hot junction of the thermopile and the environment.

The resulting increase of temperature is measured via thermocouples connected in series or series-parallel to make a thermopile. The water in the reservoir is stratified i. It measures, therefore, exactly the energy received by the thermal panel and photovoltaic panel.

Overview The LIR, manufactured by LI-COR, is a silicon pyranometer that accurately monitors sun plus sky radiation for solar, agricultural, meteorological, and hydrological applications.


Depending upon the glass, the transmission is from nm or less to about nm.

The passive cold junctions of the thermopile are in thermal contact with the pyranometer housing, which serves as a heat-sink. The three Eppley PSP pyranometers we tested gave very similar results.

Because of its inclination, the pyranometer is facing the sun more directly than if placed horizontally. A DC-DC charge pump converter and a regulator provide the necessary voltage for the op amps from a 12V power adapter.

As it provides a direct measurement of the flux of solar energy reaching the solar thermal and photovoltaic, it is the most appropriate instrument to measure the performance of these sensors. The Apogee pyranometer is at the bottom right end of the picture.

LIR-L: Pyranometer

They provide a total isolation of both the logic signal and the 5 volt supply. The circuit of the glycolated water is represented in the diagram above.

The current acquisition system is built around pyranometr Maxim Tini microcontroller. Therefore, virtually no heat is exchanged downwards virtually no heat transfer by conduction.

Systronics does the same with TStik. Review of Scientific Instruments, 77,p.