Campbell-scientific CM3 Kipp and Zonen Pyranometer Manual do Utilizador descarregar pdf (Página 10)

CM3 Pyranometer

5. Example Programs

Solar radiation can be reported as an average flux density (W m

-2

) or daily total

flux density (MJ m

-2

). The appropriate multipliers are listed in Table 5-1.

Programming examples are given for both average and daily total solar

radiation.

The output from the CM3 varies from 10-35 x 10

-6

V / W m

-2

. Given a

maximum solar radiation of 1500 W m

-2

, the maximum sensor output voltage

will be 15 - 52.5 mV. Example:

(21.87 x 10

-6

V W

-1

) ∗ (1500 W m

-2

) = 0.03281 V or 32.81 mV

TABLE 5-1. Multipliers Required for Average Flux and

Total Flux Density in SI and English Units

UNITS MULTIPLIERS

W m

-2

C∗













(average)

MJ m

-2

C∗













(total)

kJ m

-2

C∗













(total)

cal cm

-2

min

-1

14333

C∗













(average)

cal cm

-2

∗













0 02389

(total)

C=CM3 calibration: eg. 21.87x10

-6

V / W m

-2

t = datalogger execution interval in seconds

5.1 Average Solar Radiation

Example 1 shows the program instructions used by a CR10X to measure the

signal from the CM3. A sixty-minute average is calculated and stored in final

storage.

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 16

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