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GHM Delta OHM LPPYRA11, Operating Manual

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GHM Delta OHM LPPYRA11 Operating Manual Download Page 5

 

LPPYRA11 

-   5   -

 

V1.1

 

 

Fig. 2.2: : percentage change of LPPYRA11 albedometer sensitivity in the 

temperature range -20…50 °C compared to the sensitivity at 20 °C 

To prevent internal condensation forming on the internal side of the dome under cer-

tain climatic conditions, silica gel tablets are inserted inside the pyranometer to ab-

sorb humidity. 

 

Fig. 2.1: scheme of principle LPPYRA11 

Thermopile 

Surge 

Protector 

Connector 

pins 

Housing 

To cable shield 

Thermopile 

Surge 

Protector 

Temperature (°C) 

%

 ch

an

ge

 o

f 

se

nsitiv

ity

 

Thermopile 

Thermopile 

Temperature 

compensation 

Summary of Contents for Delta OHM LPPYRA11

Page 1: ...Operating manual Albedometer LPPYRA11 www deltaohm com English Keep for future reference Companies Brands of GHM ...

Page 2: ...V1 1 TABLE OF CONTENTS 1 INTRODUCTION 3 2 WORKING PRINCIPLE 4 3 INSTALLATION 6 4 ELECTRICAL CONNECTIONS 8 5 MEASUREMENT 9 6 MAINTENANCE 10 7 TECHNICAL SPECIFICATIONS 11 8 SAFETY INSTRUCTIONS 12 9 ORDERING CODES 13 ...

Page 3: ...ers can be processed to get the desired phys ical quantity The LPPYRA11 can be used as a pyranometer for measuring global radiation As a py ranometer the LPPYRA11 is a Spectrally Flat Class A Secondary Standard pyranom eter in accordance with ISO 9060 2018 and with the criteria of the WMO Guide to Meteorological Instruments and Methods of Observation The albedometer is supplied factory calibrated ...

Page 4: ...ng a standard solar spectrum the portion of solar irradiation measured by the pyranometer is greater than 99 8 Figure 2 1 shows the relative spectral sensi tivity of the LPPYRA11 albedometer and a standard solar spectrum Fig 2 1 LPPYRA11 albedometer relative spectral sensitivity blue line com pared with a standard solar spectrum red line Radiant energy is absorbed by the thermopile black surface t...

Page 5: ...ensation forming on the internal side of the dome under cer tain climatic conditions silica gel tablets are inserted inside the pyranometer to ab sorb humidity Fig 2 1 scheme of principle LPPYRA11 Thermopile Surge Protector Connector pins Housing To cable shield Thermopile Surge Protector Temperature C change of sensitivity Thermopile Thermopile Temperature compensation ...

Page 6: ... a coin 3 Remove the cartridge perforated cap 4 Open the sachet containing silica gel supplied with the pyranometer 5 Fill the cartridge with the silica gel crystals 6 Close the cartridge with its own cap paying attention that the sealing O ring be properly positioned 7 Screw the cartridge to the pyranometer body using a coin 8 Check that the cartridge is screwed tightly if not silica gel life wil...

Page 7: ...any kind of obstruction which might re flect sunlight or sun shadow onto the pyranometer itself In compliance with ISO TR9901 standard and WMO recommendations when the pyranometer is used without the white shade disk it must be positioned so that its connector is pointed to the North Pole if the instrument is used in the Northern Hemisphere and to the South Pole if used in the Southern Hemisphere ...

Page 8: ... albedometer features the readout instrument should have 1 µV res olution Connector Function Color 1 Output positive Vout upper pyranometer Red 2 Output negative Vout upper pyranometer Blue 3 Not connected 4 Not connected 5 Output negative Vout lower pyranometer Brown 6 Housing White 7 Cable shield Black 8 Output positive Vout lower pyranometer Green Fig 4 1 LPPYRA11 connections The cable shield i...

Page 9: ...at the ends of the sensor and applying the following formula Ee DDP S where Ee is the irradiance expressed in W m2 DDP is the difference of potential expressed in µV measured by the multimeter S is the sensitivity of the albedometer expressed in µV Wm 2 Albedo is the fraction of solar radiation that is reflected from the ground with respect to incident radiation ALBEDO Ee Ee With the albedometer i...

Page 10: ...ters In this case the performed reading is highly over estimated To minimize the condensation the albedometer is provided with a cartridge containing dessicant material silica gel The efficiency of the silica gel crystals decreases over time while absorbing humidity Silica gel crystals are effi cient when their color is yellow while they turn white translucent as soon as they loose their efficienc...

Page 11: ...ice 0 1 Protection degree IP 67 MTBF 10 years Technical Specifications According to ISO 9060 Response time 95 5 s Zero offset a response to a 200 W m2 thermal radiation 7 W m2 b response to a 5 K h change in ambiente temperature 2 W m2 Long term instability 1 year 0 5 Non linearity 0 2 Response according to the cosine law 10 W m2 Spectral selectivity 3 Temperature response 10 40 C 1 Tilt response ...

Page 12: ...well as the specific measures described in this manual are followed The instrument proper operation and operating safety can be ensured only in the cli matic conditions specified in this manual Do not use the instruments in places where there are Corrosive or flammable gases Direct vibrations or shocks to the instrument High intensity electromagnetic fields static electricity User obligations The ...

Page 13: ...wer pyranometer spare part CPM12AA8 2 Cable with 8 pole M12 connector on one end open wires on the other end Length 2 m CPM12AA8 5 Cable with 8 pole M12 connector on one end open wires on the other end Length 5 m CPM12AA8 10 Cable with 8 pole M12 connector on one end open wires on the other end Length 10 m LPSG Cartridge to contain desiccant silica gel crystals complete with O ring and cap LPG Pac...

Page 14: ...LPPYRA11 14 V1 1 NOTES ...

Page 15: ......

Page 16: ...zed third parties is excluded from the guarantee The instrument shall be returned FREE OF SHIPMENT CHARGES to your dealer The jurisdiction of Padua applies in any dispute The electrical and electronic equipment marked with this symbol cannot be disposed of in public landfills According to the Directive 2011 65 EU the european users of electrical and electronic equipment can return it to the dealer...

Page 17: ...he result of the constant development of the product This may produce some differences between the information written in this manual and the instrument you have purchased We cannot completely exclude the possibility of errors in the manual for which we apologize The data images and descriptions included in this manual cannot be legally asserted We reserve the right to make changes and corrections...

Page 18: ...GHM GROUP Delta OHM Delta Ohm S r l a socio unico Via Marconi 5 35030 Caselle di Selvazzano Padova ITALY Phone 39 049 8977150 Fax 39 049 635596 www deltaohm com info deltaohm com V1 1 04 12 2019 ...

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