Related Manuals for GHM DeltaOHM LPPYRA10
Summary of Contents for GHM DeltaOHM LPPYRA10
- Page 1 English Operating manual Pyranometer LPPYRA10 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 ................10 LPPYRA10 ................... 10 CONNECTIONS LPPYRA10AC[4] ................11 CONNECTIONS LPPYRA10AV[4] ................11 CONNECTIONS LPPYRA10S .................. 12 CONNECTIONS LPPYRA10S12 ................13 CONNECTIONS LPPYRA10ACS[4] ................. 14 CONNECTIONS MEASUREMENT IN THE MODELS WITH ANALOG OUTPUT ........ -
Page 3: Introduction
INTRODUCTION LPPYRA10 pyranometer measures the irradiance on a flat surface (W/m ). The meas- ured irradiance (Global Irradiance) is the sum of direct solar irradiance and diffuse ir- radiance. LPPYRA10 is a Spectrally Flat Class A (Secondary Standard) pyranometer in accord- ance with ISO 9060:2018 and with the criteria of the WMO “Guide to Meteorological Instruments and Methods of Observation”. -
Page 4: Working Principle
2 WORKING PRINCIPLE LPPYRA10 pyranometer is based on a thermopile sensor. The thermopile sensitive sur- face is coated with a black matt paint, which allows the pyranometer not to be selec- tive at different wavelengths. In order to grant the thermopile a proper thermal insulation from the wind and reduce the sensitivity to thermal irradiance, LPPYRA10 is equipped with two concentric domes having 50 mm and 32 mm outer diameter. - Page 5 Temperature (°C) Fig. 2.2: : percentage change of LPPYRA10 pyranometer 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 pyranometer, refill the cartridge containing silica-gel crystals. Sil- ica gel absorbs humidity in the dome chamber and prevents, in particular climatic conditions, condensation on the internal walls of the domes and measurement altera- tion. 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 • The pyranometer must be mounted in an easy-to-reach location in order to clean the dome regularly and carry out maintenance. At the same time, make sure that no buildings, constructions, trees or obstructions exceed the horizontal plane where the pyranometer lies. If this is not possible, select a site where obstructions in the path of the sun from sunrise to sunset do not exceed 5 degrees of elevation.
- Page 8 HD2003.79K HD2003.85K HD2003.83 HD2003.83.1 HD2003.77C HD9007 LPPYRA10 80° MAX TP32MTT.03.C HD9007T29.1 A = Palo 750 mm B = Raccordo di base C = Piastra di supporto graduata int. D = Staffa per piranometro M37 x 2 Fig. 3.3: fixing accessories LPPYRA10 V2.6...
- Page 9 Fig. 3.4: fixing accessories LPPYRA10 V2.6...
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Page 10: Electrical Connections
4 ELECTRICAL CONNECTIONS LPPYRA10, LPPYRA10AC[4] and LPPYRA10AV[4] have a 4-pole connector and use the CPM12AA4... optional cables, with 4-pole connector on one side and open wires on the other side. LPPYRA10S and LPPYRA10S12 have a 8-pole connector and use the CPM12-8D... optional cables, with 8-pole connector on one side and open wires on the other side. -
Page 11: Lppyra10
4.2 LPPYRA10AC[4] CONNECTIONS The pyranometer LPPYRA10AC[4] has 4…20 mA output and requires 10…30 Vdc ex- ternal power supply. It is to be connected to a power supply and an instrument with 4…20 mA input as shown in fig. 4.2. The load resistance of the instrument reading the signal must be ≤... -
Page 12: Lppyra10S
4.4 LPPYRA10S CONNECTIONS The pyranometer LPPYRA10S has RS485 Modbus-RTU output and requires 5…30 Vdc external power supply. It is to be connected to a power supply and to a PLC, a data logger or a RS485/USB or RS485/RS232 converter for PC as shown in fig. 4.4. -
Page 13: Lppyra10S12
4.5 LPPYRA10S12 CONNECTIONS The pyranometer LPPYRA10S12 has SDI-12 output and requires 7…30 Vdc external power supply. It is to be connected to a power supply and to an acquisition system (data logger) as shown in fig. 4.5. Connector Function Cable color Power supply negative (GND) Blue SDI-12 output negative... -
Page 14: Lppyra10Acs
4.6 LPPYRA10ACS[4] CONNECTIONS The pyranometer LPPYRA10ACS[4] has two outputs: • One 4…20 mA output, requiring 10…30 Vdc external power supply. It is to be connected to a power supply and an instrument with 4…20 mA input as shown in fig. 4.6. The load resistance of the instrument reading the signal must be ≤ 500 Ω. •... -
Page 15: Measurement In The Models With Analog Output
5 MEASUREMENT IN THE MODELS WITH ANALOG OUTPUT Below are the ways to calculate the global irradiance in the models with analog output LPPYRA10, LPPYRA10AC[S][4] and LPPYRA10AV[4]. 5.1 LPPYRA10 Each pyranometer is distinguished by its own sensitivity (or calibration factor) S ex- pressed in µV/(Wm ) and shown in the label on the pyranometer (and in the calibra- tion report). -
Page 16: Rs485 Modbus-Rtu Output
6 RS485 MODBUS-RTU OUTPUT Before connecting the pyranometer to the RS485 network, an address must be assigned and the communication parameters must be set, if different from the factory preset. 6.1 S ETTING THE COMMUNICATION PARAMETERS Connect the pyranometer to the PC in one of the following two ways: A. - Page 17 4. Within 10 seconds from the pyranometer power on, send the @ command and press Enter. Note: if the pyranometer does not receive the @ command within 10 seconds from power on, the RS485 MODBUS mode is automatically activated. In such a case, it is necessary to switch off and on again the pyranometer.
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Page 18: Rtu Protocol
6.2 R -RTU EADING THE MEASURES WITH THE ODBUS PROTOCOL In MODBUS mode, you can read the values measured by the pyranometer through the function code 04h (Read Input Registers). The following table lists the quantities available with the appropriate register address: Number Address Quantity... -
Page 19: Sdi-12 Output
7 SDI-12 OUTPUT The LPPYRA10S12 pyranometers are compatible with version 1.3 of SDI-12 protocol. The protocol communication parameters are: Baud rate = 1200. Data bits = 7, Parity = Even, Stop bits = 1. The communication with the instrument is performed by sending a command in the following form: <Address><Command>! with <Address>... - Page 20 Command Instrument reply Description a<CR><LF> Request of the address of the instrument. If more than one sensor is connected to the bus, a conflict occurs. START MEASUREMENT AND TYPE START CONCURRENT MEASUREMENT COMMANDS Irradiance, signal internal level and internal temperature atttn<CR><LF>...
- Page 21 Command Instrument reply Description Internal temperature atttn<CR><LF> Request to execute the aM2! measurement. aC2! with: ttt = number of seconds necessary for the in- strument to make the measure available (3 characters) n = number of detected variables (1 character for aM2!, 2 characters for aC2!) Note: ttt = 000 means datum immediately available.
- Page 22 1) Send the command aXSCAL USER ON! (note: a=instrument address). 2) Send the command aXSCFD! (to set °C) or aXSCFE! (to set °F). 3) Send the command aXSCAL END! For more information about the SDI-12 protocol, visit the website "www.sdi-12.org". LPPYRA10 V2.6...
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Page 23: Maintenance
8 MAINTENANCE In order to grant measurements high accuracy, it is important to keep the outer glass dome clean. Consequently, the more the dome will be kept clean, the more measure- ments will be accurate. You can wash it using water and standard papers for lens. If necessary, use pure ETHYL alcohol. -
Page 24: Technical Specifications
TECHNICAL SPECIFICATIONS Thermopile Sensor Typical sensitivity 6÷11 µV/Wm 5÷50 Ω Impedance Measuring range 0÷2000 or 0÷4000 W/m depending on model 2π sr Viewing angle Spectral range (50%) 283÷2800 nm -40÷80 °C / 0÷100% Operating temperature/humidity Output Analog in µV/Wm (LPPYRA10) Analog 4÷20 mA (LPPYRA10AC[S]) Analog 0÷1 V, 0÷5 V or 0÷10 V (LPPYRA10AV) Digital RS485 Modbus-RTU (LPPYRA10[AC]S) -
Page 25: Safety Instructions
10 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 26: Accessories Ordering Codes
11 ACCESSORIES ORDERING CODES UV-resistant shade disk (spare part). LPSP1 Fixing bracket for the pyranometer, suitable for ∅ 40 ÷ 50 mm LPS1 mast. Installation on horizontal or vertical mast. Base with levelling device and adjustable holder for mounting the LPRING02 pyranometer in an inclined position (specify upon ordering on which pyranometer model has to be mounted). - Page 28 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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