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Summary of Contents for GHM DeltaOHM LPPYRA11
- Page 1 English Operating manual Albedometer LPPYRA11 www.deltaohm.com Keep for future reference.
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Page 2: Table Of Contents
TABLE OF CONTENTS INTRODUCTION ....................3 WORKING PRINCIPLE ................... 4 INSTALLATION ..................... 6 ELECTRICAL CONNECTIONS .................. 8 MEASUREMENT ..................... 9 MAINTENANCE ....................10 TECHNICAL SPECIFICATIONS ................11 SAFETY INSTRUCTIONS ..................12 ORDERING CODES ....................13 LPPYRA11 V1.2... -
Page 3: Introduction
INTRODUCTION The LPPYRA11 albedometer measures the net global radiation, as well as the albedo of grounds (albedo is the ratio between diffuse radiation from a determined surface and the quantity of radiation that arrives on the surface). The LPPYRA11 is manufactured mounting two LPPYRA10 pyranometers in one housing only. -
Page 4: Working Principle
2 WORKING PRINCIPLE The LPPYRA11 albedometer is based on a pair of thermopile sensors, one of them measuring the incident radiation on the ground [ ↓ ] and the other one the reflected radiation [ ↑ ]. Each thermopile works as an independent pyranometer. The thermo- pile sensitive surface is coated with a black matt paint, which allows the pyranometer not to be selective at different wave lengths. - Page 5 Temperature (°C) 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.
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Page 6: Installation
3 INSTALLATION Before installing the albedometer, refill the cartridge containing silica-gel crystals. Sili- ca gel absorbs humidity in the dome chamber and prevents, in particular climatic con- ditions, condensation on the internal walls of the domes and measurement alteration. Do not touch the silica gel crystals with your hands while refilling the cartridge. Carry out the following instructions in an environment as drier as possible: 1. - Page 7 • Mount the albedometer 1 – 2 m above the ground. Grass should be kept at the same height all the year long. In snowy regions, keep the instrument above the blanket of snow so that the distance from the albedometer to the snow be constant. •...
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Page 8: Electrical Connections
4 ELECTRICAL CONNECTIONS LPPYRA11 has a 8-pole connector and uses the CPM12AA8... optional cables, with 8-pole connector on one side and open wires on the other side. The metallic housing of the albedometer should preferably be grounded ( ) locally. In this case, do not connect the wire of the cable corresponding to the housing to prevent ground loops. -
Page 9: Measurement
5 MEASUREMENT Each of the two pyranometer that make up the albedometer is distinguished by its own sensitivity (or calibration factor) S expressed in µV/(Wm ) and shown in the label on the pyranometer (and in the calibration report). The irradiance E is obtained by measuring with a multimeter the difference of potential DDP at the ends of the sensor and applying the following formula: = DDP / S... -
Page 10: Maintenance
6 MAINTENANCE In order to grant measurements high accuracy, it is important to keep the outer glass domes clean. Consequently, the more the domes will be kept clean, the more meas- urements will be accurate. You can wash it using water and standard papers for lens. If necessary, use pure ETHYL alcohol. -
Page 11: Technical Specifications
TECHNICAL SPECIFICATIONS Sensor Thermopile Typical sensitivity 6÷11 µV/Wm 5÷50 Ω Impedance Measuring range 0÷4000 W/m Viewing angle 2π sr Spectral range (50%) 283÷2800 nm Operating temperature/humidity -40÷80 °C / 0÷100% Output Analog in µV/Wm Connection 8-pole M12 connector Dimensions Fig. 3.2 Weight 1.35 kg approx. -
Page 12: Safety Instructions
SAFETY INSTRUCTIONS General safety instructions The instrument has been manufactured and tested in accordance with the safety standard EN61010-1:2010 “Safety requirements for electrical equipment for meas- urement, control and laboratory use” and has left the factory in perfect safety tech- nical conditions. -
Page 13: Ordering Codes
ACCESSORIES ORDERING CODES LPSP1 UV-resistant shade disk for the upper pyranometer (spare part). LPSP3 UV-resistant shade disk for the lower pyranometer (spare part). CPM12AA8… Cable with 8-pole M12 connector on one end, open wires on the other end. Length 2 m (CPM12AA8.2), 5 m (CPM12AA8.5) or 10 m (CPM12AA8.10). - Page 14 OTES LPPYRA11 V1.2...
- Page 16 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 | sales@deltaohm.com WARRANTY Delta OHM is required to respond to the "factory warranty" only in those cases provided by Legislative Decree 6 September 2005 - n.
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