1 example programs, 1 cr1000 example program – Campbell Scientific LI200X-L LI-COR Silicon Pyranometer User Manual
Page 10
LI200X Pyranometer
TABLE 4-1. Multipliers Required for
Average Flux and Total Flux Density in Sl
and English Units
UNITS MULTIPLIER
PROCESS
W m
-2
200
Average
MJ m
-2
t * 0.0002
Total
kJ m
-2
t * 0.2
Total
cal cm
-2
min
-1
0.2 * (1.434)
Average
cal cm
-2
t * 0.2 * (0.0239)
Total
t = datalogger execution interval in seconds
4.1 Example Programs
The following programs measure the LI200X every 10 seconds, and convert
the mV output to Wm
-2
and MJm
-2
. Both programs output an hourly average
flux (Wm
-2
) and a daily total flux density (MJm
-2
). Negative values are set to
zero before being processed. Wiring for the examples is given in Table 4-2.
TABLE 4-2. Wiring for Example Programs
Color Description
CR1000 CR10X
Red Signal
1H 1H
Black Signal
Reference 1L
1L
White Signal
Ground
AG
Clear Shield
G
4.1.1 CR1000 Example Program
In the CR1000 example, a daily total flux density is found. This total flux
density is in MJ m
-2
day
-1
. Negative values are set to zero before they are
added to the running total.
'CR1000
'Declare Variables and Units
Public SlrW
Public SlrMJ
Units SlrW=W/m²
Units SlrMJ=MJ/m²
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