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Campbell SP-LITE Instruction Manual

Silicon pyranometer
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SP-LITE Silicon Pyranometer
Revision: 7/04
C o p y r i g h t
©
1 9 9 8 - 2 0 0 4
C a m p b e l l
S c i e n t i f i c ,
I n c .

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Summary of Contents for Campbell SP-LITE

  • Page 1 SP-LITE Silicon Pyranometer Revision: 7/04 C o p y r i g h t © 1 9 9 8 - 2 0 0 4 C a m p b e l l S c i e n t i f i c ,...
  • Page 2 CAMPBELL SCIENTIFIC, INC. CAMPBELL SCIENTIFIC, INC. will return such products by surface carrier prepaid. This warranty shall not apply to any CAMPBELL SCIENTIFIC, INC. products which have been subjected to modification, misuse, neglect, accidents of nature, or shipping damage. This warranty is in lieu of all other warranties, expressed or implied, including warranties of merchantability or fitness for a particular purpose.

  • Page 3: Table Of Contents

    1. SP-LITE Sensor without Leveling Fixture ..........1 2. SP-LITE Electrical Circuit................2 3. Spectral Sensitivity of Pyranometers Compared with Solar Radiation ..2 4. Cosine Response of a Typical SP-LITE Pyranometer ........3 5. Dimensions of SP-LITE with Leveling Device ..........4 6. 015ARM Mounting Arm ................5 7.
  • Page 4 SP-LITE Table of Contents Tables 1. Datalogger Connections for Differential Measurement ......7 2. Datalogger Connections for Single-Ended Measurement......7 3. Multipliers Required for Flux Density and Total Fluxes ......8...

  • Page 5: General Description

    The SP-LITE measures incoming solar radiation (sun plus sky radiation) with a photodiode detector. Output from the photodiode is a current, which is converted to voltage by an internal shunt resistor. The SP-LITE can be used in solar energy applications such as plant growth, thermal convection and evapotranspiration.

  • Page 6: Spectral Properties

    FIGURE 2. SP-LITE Electrical Circuit 1.2 Spectral Properties The spectral properties of the SP-LITE are mainly determined by the spectral response of the photodiode, which is shown in Figure 3, below. FIGURE 3. Spectral Sensitivity of Pyranometers Compared with Solar Radiation The SP-LITE is calibrated for solar radiation under clear sky conditions.

  • Page 7: Directional/Cosine Response

    At any angle between 0 and 90 degrees the sensitivity should be proportional to the cosine of the angle of incidence. Figure 4 shows the behavior of a typical SP-LITE. The vertical axis shows the deviation from ideal behavior, expressed in percentage deviation from the ideal value.

  • Page 8: Sensor Specifications

    Anodized aluminum Cable material: Polyurethane Weight: 110 g Cable length: 5 m (can be extended up to 100 m) Physical Dimensions: See Figure 5 Environmental Working temperature: -30 to +70°C Dimensions ∅ 80 FIGURE 5. Dimensions of SP-LITE with Leveling Device...

  • Page 9: Installing The Sp-Lite

    SP-LITE Silicon Pyranometer 3. Installing the SP-LITE The SP-LITE and PN 14282 base/leveling fixture are attached to a tripod or tower using one of two mounting configurations (see Figures 6 - 7). Mount the sensor on the mounting arm so that no shadow will be cast on it at any time of day, at any time of year, from obstructions such as trees, buildings or the mast or structure on which it is mounted.
  • Page 10 Mount the sensor on the mounting arm at a height of at least 1.5 m above the ground surface to minimize shading effects. PN 14282 mounting bracket has a built-in bubble level that is used to mount the SP-LITE to the 025STAND or 015ARM. Mount and adjust the SP-LITE as follows: Attach the mounting arm to the tripod or tower at the required height.

  • Page 11: Datalogger Programming

    Shield Clear 5. Datalogger Programming The SP-LITE outputs a low-level voltage ranging from 0 to a maximum of about 15mV. A differential voltage measurement (Instruction 2, VoltDiff) is recommended because it has better noise rejection than a single-ended measurement. If a differential channel is not available, a single-ended measurement (Instruction 1, VoltSE) can be used.

  • Page 12: Wiring

    Measurement instructions for the CR1000 have a separate parameter for the integration time. 5.2 Calibration Factor and Multiplier All SP-LITE sensors have a sensitivity, or calibration factor, of 10 µV/(W m Solar radiation can be reported as an average flux density (W m ) or daily total flux density (MJ m ).
  • Page 13 SP-LITE Silicon Pyranometer EXAMPLE 1. Sample Instructions used to Measure an Average Flux with a CR10X ;{CR10X} *Table 1 Program 01: 10 Execution Interval (seconds) 01: Volt (Diff) (P2) 1: 1 Reps 2: 23** ± 25 mV 60 Hz Rejection Range...

  • Page 14: Program Example 2, Total Solar Radiation

    SP-LITE Silicon Pyranometer 5.4 Program Example 2, Total Solar Radiation In Example 2 a daily total flux density is found. This total flux density is in MJ . Negative values are set to zero before they are added to the running total.
  • Page 15 SP-LITE Silicon Pyranometer EXAMPLE 2. Sample Instructions used to Measure a Daily Total Flux Density with a CR10X ;{CR10X} *Table 1 Program 01: 10 Execution Interval (seconds) 01: Volt (SE) (P1) 1: 1 Reps 2: 23** ± 25 mV 60 Hz Rejection Range...

  • Page 16: Program Example 3, Average And Total Solar Radiation

    Public Slr_kW Public Slr_MJ 'Declare Hourly Data Table DataTable(Table1,True,-1) DataInterval(0,60,Min,0) Average(1,Slr_kW,IEEE4,0) EndTable 'Declare Daily Data Table DataTable(Table2,True,-1) DataInterval(0,1440,Min,0) Totalize(1,Slr_MJ,IEEE4,0) EndTable 'Program BeginProg Scan(10,Sec,1,0) 'SP-LITE Pyranometer measurements Slr_MJ and Slr_kW: VoltDiff(Slr_kW,1,mV25,1,True,0,_60Hz,1,0) If Slr_kW<0 Then Slr_kW=0 Slr_MJ=Slr_kW*0.001 Slr_kW=Slr_kW*0.1 CallTable(Table1) CallTable(Table2) NextScan EndProg...

  • Page 17: Maintenance

    SP-LITE Silicon Pyranometer 6. Maintenance The SP-LITE is an ‘all weather’ instrument and is very stable, but should be handled with care. It requires little periodic maintenance, apart from cleaning the sensor surfaces carefully with a soft cloth using water or alcohol.
  • Page 18 SP-LITE Silicon Pyranometer This is a blank page.
  • Page 19 This is a blank page.
  • Page 20 Campbell Scientific Companies Campbell Scientific, Inc. (CSI) 815 West 1800 North Logan, Utah 84321 UNITED STATES www.campbellsci.com info@campbellsci.com Campbell Scientific Africa Pty. Ltd. (CSAf) PO Box 2450 Somerset West 7129 SOUTH AFRICA www.csafrica.co.za sales@csafrica.co.za Campbell Scientific Australia Pty. Ltd. (CSA)

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