SP Lite2 Silicon Pyranometer
5: 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)
6: Real Time (P77)^20296
1: 0220 Day,Hour/Minute (midnight = 2400)
7: Average (P71)^26841
1: 1 Reps
2: 1 Loc [ W_m2 ]
; * Proper entries will vary with program and input channel assignments.
; ** The 250 mV range for CR10(X) and CR500/CR510, the 200 mV range for the CR23X,
and the 500 mV range for the 21X and CR7.
; *** See Table 3 for alternative multipliers.
5.4 Program Examples for Total Solar Radiation
In Examples 3 and 4 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.
5.4.1 Output Format Considerations
If the solar radiation is totalized in units of kJ m
-2
, there is a possibility of
overranging the output limits. The largest number that the CR10X datalogger
can output to final storage is 6999 in low resolution and 99999 in high
resolution (Instruction 78, Set Resolution). This is not a concern with the
CR1000 default floating point data value. However, in the following
examples the output units will be the same.
Assume that the daily total flux density is desired in kJ m
-2
. Assume an
irradiance of 0.5 kW m
-2
, the maximum low resolution output limit will be
exceeded in just under four hours. 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.
39
6999
0 5 3600
2
21 1
.
.
hr
kJ m
kJ m s s hr
(1)
To circumvent this limitation, record an average flux (see Examples 1 or 2).
Then, during post processing, multiply the average flux by the number of
seconds in the output interval to arrive at an output interval flux density. Sum
the output interval totals over a day to find a daily total flux density.
Another alternative is to record total flux using the high resolution format
(Instruction 78, see CR10X Datalogger manuals for details). The disadvantage
of the high resolution format is that it requires four bytes of memory per data
point, consuming twice as much memory as low resolution.
10
(48 pages)
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