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Summary of Contents for Delta OHM LPPYRA10
- Page 1 English Operating manual Pyranometer LPPYRA10 www.deltaohm.com Keep for future reference.
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Page 2: Table Of Contents
LPPYRA10S12 ................13 CONNECTIONS LPPYRA10ACS[4] ................. 14 CONNECTIONS MEASUREMENT IN THE MODELS WITH ANALOG OUTPUT ........15 LPPYRA10 ..................... 15 LPPYRA10AC[S][4] ..................15 LPPYRA10AV[4] ..................... 15 RS485 MODBUS-RTU OUTPUT ................16 ............... 16 ETTING THE COMMUNICATION PARAMETERS -RTU .......... 18... -
Page 3: Introduction
(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
10. The pyranometer is ready for use. The figure below shows the operations necessary to fill the cartridge with the silica gel crystals. Silica-gel Sealed sachet cartridge of silica-gel crystals Perforated cap Filling Closing the cartridge Fig. 3.1: filling the silica-gel cartridge LPPYRA10 V2.6... - Page 7 • It is preferably to thermally insulate the pyranometer from its mounting bracket ensuring, at the same time, a good electrical contact to ground. Fixing holes ∅ 6 mm Levelling device Fig. 3.2: fixing holes and levelling device LPPYRA10 V2.6...
- 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
4.1 LPPYRA10 CONNECTIONS The pyranometer LPPYRA10 is passive and does not require power supply. It is to be connected either to a millivoltmeter or to a data acquisition system. Typically, the py- ranometer output signal does not exceed 20 mV. In order to better exploit the pyra- nometer features, the readout instrument should have 1 µV resolution. -
Page 11: Lppyra10
Color Output positive (+Vout) Output negative Blue Power supply negative (GND) Power supply positive (+Vdc) White Cable shield (SH) Black Instrument with voltage input Pyranometer M12 male connector CPM12AA4… cable +Vout +Vdc Power supply Fig. 4.3: LPPYRA10AV[4] connections LPPYRA10 V2.6... -
Page 12: Lppyra10S
Connect to ground only if it is not possible to ground locally the housing of the pyranometer Fig. 4.4: LPPYRA10S connections Before connecting the pyranometer to the RS485 network, set the address and the communication parameters, if different from the factory preset (see chapter 6). LPPYRA10 V2.6... -
Page 13: Lppyra10S12
Due to its low power consumption (< 200 µA), LPPYRA10S12 is particularly suitable for battery/solar panel-powered data acquisition systems. Before connecting the instrument to an SDI-12 network containing other sensors, set the address by using the proper SDI-12 command (see chapter 7). LPPYRA10 V2.6... -
Page 14: Lppyra10Acs
Connect to ground only if it is not possible to ground locally the housing of the pyranometer Fig. 4.6: LPPYRA10ACS[4] connections Before connecting the pyranometer to the RS485 network, set the address and the communication parameters, if different from the factory preset (see chapter 6). LPPYRA10 V2.6... -
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... -
Page 16: Rs485 Modbus-Rtu Output
Parity: None Stop Bits: 2 In the program, set the COM port number to which the pyranometer will be con- nected. 3. Switch the pyranometer on (if the CP24 cable is used, connect both ends of the cable). LPPYRA10 V2.6... - Page 17 0 Violate protocol and go in Rx mode right after Tx 1 Respect protocol and wait 3.5 characters after Tx Note: it is not required to send the CAL USER ON command to read the settings. LPPYRA10 V2.6...
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Page 18: Rtu Protocol
PERATING MODE onds from power on. In the first 10 seconds from power on the pyranometer does not reply to requests from the MODBUS master unit. After 10 seconds, it is possible to send MODBUS requests to the pyranometer. LPPYRA10 V2.6... -
Page 19: Sdi-12 Output
A00 = firmware version A.0.0 16051518 = serial number b<CR><LF> Modification of the instru- aAb! ment address. Where: Note: if the b character is not an acceptable ad- b = new dress, the instrument responds with a instead of b. address LPPYRA10 V2.6... - Page 20 Reads the measurement. aD0! with: w…w = irradiance in W/m t…t = internal temperature in the set unit of measurement (default °C) Example of response: 0+228.7+25.0 probe address = 0 irradiance = 228.7 W/m internal temperature = 25.0 °C LPPYRA10 V2.6...
- Page 21 Sets °F as temperature aXSCFE! unit of measurement. aXSCAL END! a> LOCKED!<CR><LF> Disables the configuration mode. The extended commands allow setting the temperature unit of measurement (if the temperature sensor is present). To change the unit of measurement: LPPYRA10 V2.6...
- 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
Read instructions at chapter 3 about how to replace the silica-gel crystals. Silica-gel typical lifetime goes from 2 to 6 months depending on the envi- ronment where the pyranometer works. To exploit all the pyranometer features, it is highly recommended that the calibration be checked annually. LPPYRA10 V2.6... -
Page 24: Technical Specifications
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) Digital SDI-12 (LPPYRA10S12) Power supply 10÷30 Vdc (4÷20 mA, 0÷1 V and 0÷5 V outputs) 15÷30 Vdc (0÷10 V output) 5÷30 Vdc (RS485 Modbus-RTU output) -
Page 25: Safety Instructions
High-intensity electromagnetic fields, static electricity. User obligations The instrument operator shall follow the directives and regulations below that refer to the treatment of dangerous materials: • EEC directives on workplace safety. • National law regulations on workplace safety. • Accident prevention regulations. LPPYRA10 V2.6... -
Page 26: Accessories Ordering Codes
LPRING12 Ring base for measuring the diffused radiation. DELTA OHM metrology laboratories LAT N° 124 are ISO/IEC 17025 accredited by ACCREDIA for Temperature, Humidity, Pressure, Photometry / Radiometry, Acous- tics and Air Velocity. They can supply calibration certificates for the accredited quantities. - Page 27 OTES...
- Page 28 WARRANTY The manufacturer is required to respond to the "factory warranty" only in those cases provided by Legislative Decree 6 September 2005 - n. 206. Each instrument is sold after rigorous inspections; if any manufacturing defect is found, it is necessary to contact the distributor where the instrument was purchased from.
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