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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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. Detailed Description The LIR measures incoming solar radiation with a silicon photovoltaic detector mounted in a cosine-corrected head.

It measures, therefore, exactly the energy received by the thermal panel and photovoltaic panel. CRC Press, pp. Nearly all pyranometers use an optical quality glass for their hemispherical single or double domes.

Standard Precision Pyranometer – The Eppley Laboratory, EPLAB

They then measure global irradiance, that is to say one that comes from all sources in the hemisphere located above the surface: The active hot junctions are located beneath the blackened receiver surface and are heated by the radiation absorbed in the black coating. 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.

Oval vortex flowmeter Eggs Delta-Pulsegenerating 4 pulses for one litre, filtering of pulses with a as Schmitt trigger, 4N32 optocoupler, 1-wire DS integrated circuit as pulse counter directly connected to Tini. The pyranometer at the back was lacking its screen when we acquired it.

The graphs are generated using the JPgraph PhP library. Temperature measurements in the thermal collector: The LIR, manufactured by LI-COR, is a silicon pyranometer that accurately monitors sun plus sky radiation pyrranometer solar, agricultural, meteorological, and hydrological applications. Measurements are taken every 10 seconds and at the end of each minute, the average of the 60 measurements is calculated and stored.


Pyranomeetr unit has a black surface which heats up by absorbing the incident light radiation. A DC-DC charge pump converter and a regulator provide the necessary voltage for the op amps from a 12V power adapter. Systronics does the same with TStik. In winter, the solar collector “preheats” the water which is then heated by the central heating in the upper half of the reservoir.

We therefore decided to replace it with a microcontroller, which uses much less energy a few watts. Delft – The Netherlands T: Therefore, virtually no heat is exchanged downwards virtually no heat pyranomter by conduction. Contrarily to the Eppley PSP orthe Apogee pyranometer is equiped with silicon photovoltaic cell.

More recent, higher performance, pyranometers use a Peltier element. How the thermopile pyranometer works The thermoelectric detection principle is used, whereby incoming radiation is almost completely absorbed by a horizontal blackened pyrahometer, over a very wide wavelength range. The pyranommeter cold junctions of the thermopile are in thermal contact with the pyranometer housing, which serves as a heat-sink.

The Apogee pyranometer and the Eppley pyranometer not shown in the picture produced measurements which were different from the three Eppley PSP, which shows that pyranometer can be affected by drift.

Weatherproof anodized aluminum case with acrylic diffuser and stainless-steel hardware; O-ring seal on the removable base and cable assembly. The temperature in the collector red dot rises in an uncontrolled way. To build an reliable data acquisition system resquired to protect it from electrical interference and lightnings due to the fact that some sensors are placed on a roof outside the house.

The amplifier, shown here without its lid, includes a zero offset LTC operational amplifier followed by a LT operational amplifier. Images LIR-L with cable. Depending upon the glass, the transmission is from nm or less to about nm.

Standard Precision Pyranometer

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. It is necessary to protect the black pyraanometer coating against external influences which may affect the measurement; such as precipitation, dirt and wind.


Temperature measurements in the hot water tank: The black surface is in contact with the hot junction of a heat detector that works by thermoelectric effect thermopile consisting of gold-palladium thermocouples. In summer, the collector provides enough heat to run completely without any central heating which is of course turned off during this season.

We also have an Eppley pyranometer and an Apogee pyranometer. The detector generates a small voltage in proportion to the temperature difference between the black absorbing surface and the instrument eplpey.

We resolved this difficulty by discovering of a series of components and examples of circuits by Analog Devices that were ideally suited for our project herehereet here. They provide a total isolation of both the logic signal and the 5 volt supply. The collector consists of 30 glass vacuum tubes, each containing a black metal plate which absorbs solar radiation.

Dallas devoted a team of talented engineers to TINI. Weight 84 g 2.

The data acquistion system has changed several times. The bottom half is heated by the solar collector. A pyranometer Greek pur fire, anaabove and metronmeasure was installed in early November The Apogee pyranometer is at the bottom right end of the picture.

This solution was later abandoned because the datalogger crashed periodically for a reason that could not be determined even with the help of RESOL.

In our installation, we tilted the pyranometer to put it parallel to the solar panels at We have designed and built our own electronic circuitry needed to use the temperature sensors.

Another possibility is to compare several identical pyranometers. Measurement of the hot water drawn out of the tank: The top half of the tank is heated by central heating, as with a conventional system. As it provides a direct measurement of the flux eppey solar energy reaching the solar thermal and photovoltaic, it is the most appropriate instrument to measure the performance of these sensors.