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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They provide a total isolation of both the logic signal and the 5 volt supply. Generally, pyranometers are installed horizontally.

Therefore, virtually no heat is exchanged downwards virtually no heat transfer by conduction. Delft – The Netherlands T: In Marchthe heating system was equipped with a Vessmann Vitosolic regulator, which provides a much more effective control than the old Vitosolic regulator.

It is sensitive to a wide range of wavelengths, from infrared to ultraviolet to nm.

Standard Precision Pyranometer – The Eppley Laboratory, EPLAB

The temperature in the collector red dot rises in an uncontrolled way. All measurements are recorded at 1 minutes intervals and the measurements are send every pyranoeter by FTP to the eausolaire. 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.


The measured irradiance is greater than that which would be provided if pyranometed pyranometer was placed horizontally. 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.

Measurement of the hot water drawn out of the tank: A laptop is connected to the datalogger to retreive the recorded data. 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. Our SMP range of Smart pyranometers have the same detectors as the equivalent CMP models but with built-in digital signal processing and performance enhancement, and therefore they require external power to operate.

We have taken the option to acquire several Eppley PSP pyranometers and to compare them. The active hot junctions are located beneath the blackened receiver surface and are heated by the radiation absorbed in the black coating. Contrarily to the Eppley PSP orthe Apogee pyranometer is equiped with silicon photovoltaic cell. The graphs are generated using the JPgraph PhP library.

Despite their different ages attested by their serial numbers, we observed virtually no drift in their calibration.

Chaleur produite par le capteur solaire (heure par heure)

This eppley is used in numerous meteorological stations around the world. The Apogee pyranometer and the Eppley pyranometer not shown in the pyanometer produced measurements which were different from the three Eppley PSP, which shows that pyranometer can be affected by drift.


More recent, higher performance, pyranometers use a Peltier element. Depending upon the glass, the transmission is from nm or less to about nm. The unit has a black surface which heats up by absorbing the incident light radiation.

Currently only one measurement is taken per minute. The three Eppley PSP pyranometers we tested gave very similar results.

Black & White Pyranometer

They then measure global irradiance, that is to say one that comes from all sources in the hemisphere located above the surface: We therefore decided to replace it with a microcontroller, which uses much less energy a few watts. Our site was heavily inspired by the technical solutions and programs designed by Tim Bitson.

Weatherproof anodized aluminum case with acrylic diffuser and stainless-steel hardware; O-ring seal on the removable base and cable assembly. Measurement of the output of the photovoltaic collector: Because of its inclination, the pyranometer is facing the sun more directly than if placed horizontally.

CRC Press, pp. Gorczynski of the Polish Meteorological Institute decided to construct a pyrheliometer and a pyranometer using modified Moll-Gorczynski thermopiles.