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SP-LITE Silicon Pyranometer

5.1 Datalogger Input Range Codes

Normally the 500 mV range for the 21X and CR7, the 250 mV range for the

CR10(X) and CR500/CR510, and the 200 mV range for the CR23X are

suitable.

The parameter code for the input range also specifies the measurement

integration time. The slow or 60 Hz rejection integration gives a more noise-

free reading. A fast integration takes less power and allows for faster

throughput.

5.2 Calibration Factor and Multiplier

All SP-LITE sensors have a sensitivity (calibration factor) listed on the

calibration sheet (see Appendix A for example). Solar radiation can be

reported as an average flux density (W m

-2

) or daily total flux density (MJ m

-2

The appropriate multipliers for the 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*[1/(1000*C)] (P72 total fluxes)

KJ m

-2

t*(1/C) (P72 total fluxes)

W m

-2

1000/C (P71 flux density)

KW m

-2

1/C (P71 flux density)

cal cm

-2

t*0.0239*(1/C) (P72 total fluxes)

cal cm

-2

min

-1

1.434*(1/C) (P71 flux density)

t = the datalogger program execution interval in seconds

C = Sensitivity (calibration factor with units of µV/W/m

)

5.3 Program Example 1, Average Solar Radiation

The examples below give the appropriate datalogger code for the CR10X

datalogger, using either Instruction 2 (differential) or Instruction 1 (single-

ended).

Example 1 shows the program instructions used to measure the signal from the

SP-LITE. A thirty-minute average is calculated and stored in final storage.

Wiring for Example 1

Colour

Function

Example CR10X

Program Channels

Used

White Radiation Signal 1H

Green Signal Reference 1L

Jumpered to AG

Clear Shield G

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 22 23

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