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Summary of Contents for Delta OHM LPSD18
- Page 1 English Operating manual Sunshine duration sensor LPSD18 www.deltaohm.com Keep for future reference.
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Page 2: Table Of Contents
-RTU .......... 13 EADING THE MEASURES WITH THE ODBUS PROTOCOL ............14 HANGE OF THE HEATING ACTIVATION TEMPERATURE SDI-12 OUTPUT ....................15 MAINTENANCE ....................19 TECHNICAL SPECIFICATIONS ................20 SAFETY INSTRUCTIONS ..................21 ACCESSORIES ORDERING CODES ............... 22 LPSD18 V1.6... -
Page 3: Introduction
(SRD), therefore it can be used as a low cost alterna- tive to a pyrheliometer, which use is bound to a solar tracker. LPSD18 is equipped with a heating element separately powered and galvanically iso- lated, which prevents the formation of condensation on the glass surface onto which the sensitive elements are placed. -
Page 4: Operating Principle
2 OPERATING PRINCIPLE The Sunshine Duration LPSD18 is based on the use of 16 sensors arranged in such a way that, in the presence of sun, at least one of the photo-detectors is exposed to sun light directly from the sun (besides the diffusion component). -
Page 5: Installation
5° from the horizontal plane of the sunshine duration sensor. It should be also checked that there are no re- flective elements that may alter the measure. The LPSD18 does not need any positioning adjustment during the year. LPSD18 V1.6... - Page 6 Fig. 3.2: LPSD18.19K support • Installation on the base LPSD18.O. The base allows the inclination of the sensor up to 80° (with graduated scale) respect to the vertical. Two adjustable feet and one fixed foot allow the sensor horizontal levelling.
- Page 7 Adjustable installation on a mast Adjustable installation on a flat base with LPSD18.VK with LPSD18.O support Fig. 3.5: supports Before orienting the Sunshine Duration Sensor to its final position, place it vertically and adjust the base (for installation on a plane) or support (for installation on a ø 40 mm mast) feet so that the level on the upper side of the instrument is perfectly lev- elled (Fig.
- Page 8 The angle that instrument axis should make with respect to the ground is equal to the latitude of the installation site, this way the axis of the instrument will be parallel to the earth axis North-South (Fig. 3.8). Fig. 3.8: Sunshine Duration Sensor parallel to the Earth axis LPSD18 V1.6...
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Page 9: Lectrical Onnections
Cable CP18…. Instrument M12 male Connector Fig. 3.9: connections Connector CP18… cable Function pin N° wire N°/colour LPSD18.1[R] (**) Power supply negative 12/Black + 7/Violet + 6/Pink (**) Power supply positive 1/Red + 2/Blue + 4/Grey-Pink Heating 3/Yellow RS485 A/-... - Page 10 7…30 Vdc - Power supply + Power supply Shield Fig. 3.10: RS485 connection Power Supply 7…30 Vdc CP18… cable - G ND DATA SDI-12 BUS Data logger Other SDI-12 Other SDI-12 input sensor sensor Fig. 3.11: SDI-12 connection LPSD18 V1.6...
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Page 11: Rs485 Modbus-Rtu Output
5. Send the command CAL USER ON. Note: the command CAL USER ON is disabled after 5 minutes of inactivity. 6. Send the serial commands given in the following table to set the RS485 MODBUS parameters: LPSD18 V1.6... - Page 12 5 8O2 Read waiting time after transmission Rx Mode (0,1) 0 Immediate reception (violates protocol) 1 Waiting 3.5 characters (respects protocol) Note: it is not required to send the CAL USER ON command to read the settings. LPSD18 V1.6...
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Page 13: Reading The Measures With The Modbus -Rtu Protocol
Radiation detected by sensor #16 in W/m [x10] 16-bit integer For the numbering of the sensors see the following figure. To identify the sensors, the reference is the square mark at the top when the sensor is installed. LPSD18 V1.6... -
Page 14: Change Of The Heating Activation Temperature
: in order to check if HECK OF THE CORRECT INTERPRETATION OF THE COMMANDS the last MODBUS command sent to the instrument has been interpreted correctly, verify that the Holding Register with address 0 contains the value 0. LPSD18 V1.6... -
Page 15: Sdi-12 Output
5 SDI-12 OUTPUT LPSD18.3 is equipped with an SDI-12 communication interface compliant with the version 1.3 of the 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>! - Page 16 Note: ttt = 000 means datum immediately available. Reads the measurement of a+rrrr<CR><LF> aD0! direct solar radiation with: rrrr = SRD with resolution 1 W/m (SRD) in W/m Example of response: 0+0135 The instrument with address 0 measures SRD = 135 LPSD18 V1.6...
- Page 17 = 0 if SRD < 120 W/m , x = 1 if SRD ≥ 120 of sun). a+rrrr<CR><LF> Reads the measure of the aR1! direct solar radiation with: rrrr = SRD with resolution 1 W/m (SRD) in W/m LPSD18 V1.6...
- Page 18 <CR><LF>. The format of these commands is obtained from the pre- vious by adding the letter C: aMC!, aMC1!, aMC2!, aMC3!, aCC!, aCC1!, aCC2!, aCC3!. For more information about the SDI-12 protocol, visit the website "www.sdi-12.org". LPSD18 V1.6...
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Page 19: Maintenance
Read instructions on 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 sensors works. LPSD18 V1.6... -
Page 20: Technical Specifications
-40…+80 °C Weight 0.9 kg Protection degree IP66 Outputs • RS485 MODBUS-RTU LPSD18.1 • Galvanically isolated contact closed = SRD ≥ 120 W/m open = SRD < 120 W/m • RS485 MODBUS-RTU LPSD18.2 • Analog output 0…1 V (0…2000 W/m •... -
Page 21: 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. LPSD18 V1.6... -
Page 22: Accessories Ordering Codes
Cartridge for containing crystals of silica gel with O-ring. Pack of 5 cartridges of the silica-gel. DELTA OHM metrology laboratories LAT N° 124 are ISO/IEC 17025 accredited by AC- CREDIA for Temperature, Humidity, Pressure, Photometry / Radiometry, Acoustics and Air Velocity. They can supply calibration certificates for the accredited quantities. - Page 24 | 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. 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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