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Campbell SP-LITE, Instruction Manual

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SP-LITE Table of Contents 

ii 

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 
 
 
 
 

Summary of Contents for 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 I n c ...

Page 2: ... other warranties expressed or implied including warranties of merchantability or fitness for a particular purpose CAMPBELL SCIENTIFIC INC is not liable for special indirect incidental or consequential damages Products may not be returned without prior authorization The following contact information is for US and International customers residing in countries served by Campbell Scientific Inc direc...

Page 3: ...Example 1 Average Solar Radiation 8 5 4 Program Example 2 Total Solar Radiation 10 5 4 1 Output Format Considerations 10 5 5 Program Example 3 Average and Total Solar Radiation 12 6 Maintenance 13 6 1 Calibration 13 7 Troubleshooting 13 7 1 Pyranometer produces no apparent output 13 7 2 Readings are not as expected 13 Figures 1 SP LITE Sensor without Leveling Fixture 1 2 SP LITE Electrical Circuit...

Page 4: ... LITE Table of Contents ii 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: ...s designed for continuous outside use and its calibration is valid only for unshaded natural daylight not for artificial light It is most usually used to measure solar radiation being received on the horizontal plane However the SP LITE can if required be used in an inverted or tilted position 1 1 Electrical Properties The SP LITE consists of a photodiode complete with housing and cable The circui...

Page 6: ...adiation under clear sky conditions The spectrum for these conditions at sea level is also shown in Figure 3 Unfortunately however the actual solar spectrum varies as a function of cloud cover season and solar elevation Since the pyranometer does not have a flat sensitivity across the whole solar spectrum the accuracy of its response will vary However the error range across the whole spectrum has ...

Page 7: ...zero sensitivity at an angle of incidence of 90 degrees radiation passing over the sensor surface 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 FIGURE 4 Cosine Respons...

Page 8: ...tral range 400 to 1100 nm Detector type BPW 34 Directional Cosine corrected between 80 angle of incidence error within 10 Cosine errors averaged over opposite azimuth error at 60 angle of incidence within 10 Tilt response zero error Mechanical Housing material Anodized aluminum Cable material Polyurethane Weight 110 g Cable length 5 m can be extended up to 100 m Physical Dimensions See Figure 5 En...

Page 9: ... time of day at any time of year from obstructions such as trees buildings or the mast or structure on which it is mounted In the northern hemisphere the instrument is normally oriented towards the South to avoid potential problems from shading The SP LITE will only perform to specification under clear sky conditions It must not be mounted where it is subject to shade beneath structures or beneath...

Page 10: ...d adjust the SP LITE as follows 1 Attach the mounting arm to the tripod or tower at the required height 2 Loosely attach the 14282 Kipp Zonen Base and Leveling fixture to the mounting arm using the three mounting screws provided with the mounting arm 025STAND or 015ARM 3 Level the 14282 by adjusting the three outside leveling screws as required to center the bubble in the level Tighten the three m...

Page 11: ...R10X CR510 CR23X 21X CR7 CR1000 Radiation Signal White S E Channel S E Channel S E Channel S E Channel Signal Reference Green AG Shield Clear G 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 d...

Page 12: ...measurement instruction are listed in Table 3 Programming examples are given for both average and daily total solar radiation TABLE 3 Multipliers Required for Flux Density and Total Fluxes Units Multipliers Output Processing MJ m 2 t 0 0001 P72 total fluxes KJ m 2 t 0 1 P72 total fluxes W m 2 100 P71 flux density KW m 2 0 1 P71 flux density cal cm 2 t 0 0239 0 1 P72 total fluxes cal cm 2 min 1 1 4...

Page 13: ... W_m2 2 4 3 0 F 4 30 Then Do 03 Z F P30 1 0 F 2 0 Exponent of 10 3 1 Z Loc W_m2 04 End P95 05 If time is P92 1 0 Minutes Seconds into a 2 30 Interval same units as above 3 10 Set Output Flag High Flag 0 06 Real Time P77 1 0110 Day Hour Minute 07 Average P71 1 1 Reps 2 1 Loc W_m2 Input Locations 1 W_m2 Proper entries will vary with program and input channel assignments The 25 mV range for CR10 X an...

Page 14: ...urs This value was found by taking the maximum flux density the datalogger can record in low resolution and dividing by the total hourly flux density 3 9 6999 0 5 3600 2 2 1 1 hr kJ m kJ m s s hr 1 To circumvent this limitation record an average flux see Example 1 Then during post processing multiply the average flux by the number of seconds in the output interval to arrive at a output interval fl...

Page 15: ...c MJ_m2 2 4 3 0 F 4 30 Then Do 03 Z F P30 1 0 F 2 0 Exponent of 10 3 1 Z Loc MJ_m2 04 End P95 05 If time is P92 1 0 Minutes Seconds into a 2 1440 Interval same units as above 3 10 Set Output Flag High Flag 0 06 Real Time P77 1 0110 Day Hour Minute 07 Totalize P72 1 1 Reps 2 1 Loc MJ_m2 Input Locations 1 MJ_m2 Proper entries will vary with program and input channel assignments The 25 mV range for C...

Page 16: ...with a CR1000 CR1000 Declare Variables 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 ...

Page 17: ...c or your local representative for further details 7 Troubleshooting 7 1 Pyranometer produces no apparent output If your pyranometer does not appear to be working at all do the following checks With the SP LITE disconnected from the datalogger connect a volt meter to the white and green wires The voltage range should be 0 15 mV for 0 1500 W m 2 radiation If this appears to produce no results measu...

Page 18: ...SP LITE Silicon Pyranometer 14 This is a blank page ...

Page 19: ...This is a blank page ...

Page 20: ... campbellsci com br suporte campbellsci com br Campbell Scientific Canada Corp CSC 11564 149th Street NW Edmonton Alberta T5M 1W7 CANADA www campbellsci ca dataloggers campbellsci ca Campbell Scientific Ltd CSL Campbell Park 80 Hathern Road Shepshed Loughborough LE12 9GX UNITED KINGDOM www campbellsci co uk sales campbellsci co uk Campbell Scientific Ltd France Miniparc du Verger Bat H 1 rue de Te...

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