3. Total accumulation since last reset (inches)
2
4. Average precipitation intensity since last measurement accumulator reset
1
(in/hr)
5. Max intensity since last measurement accumulator reset
1
(in/hr)
1
The
a
M!
,
a
MC!
,
a
MC1!
,
a
C!
,
a
C1!
,
a
CC!
,
a
CC1!
, and
a
RC1!
commands reset the measurement accumulator.
2
The total intensity accumulator is reset using the
a
XWARA!
,
a
XWA
+
xx.xx
!
, or
a
XWRESET!
commands. Refer to
(p. 18) for more information.
1. Intensity Corrected Accumulation (ICA) calculation:
ICA is the amount of water in HEIGHT for the tip based on the time interval between tips.
An algorithm generates a compensated value to account for flow rates above the
mechanical calibrated flow rate. Without correction, intensity rates higher than the
mechanical calibrated flow rate will under-count the rainfall amount. The intensity is
determined by time between tips, and each tip is adjusted giving the best performance
possible. For example, when the RainVUE-series has the 0.01-inch tip option, instead of
applying 0.01 inch for each tip, the algorithm generates a compensated value to account
for flow rates >1 in/hr.
2. Number of tips calculation:
Each tip event adds to the tip counter.
3. Total accumulation calculation:
New total accumulation = total accumu ICA
4. Average precipitation intensity calculation:
For each tip, the following equation is used to calculate intensity:
Intensity (over tip interval) = h/tbt * sec_per_hr = height [in or mm]/hour
Eq. 1
Where:
h = height [in or mm] or ICA
tbt = time between tips [sec]
sec_per_hr = 3600 sec/hr
Each intensity value is added to an accumulator.
The accumulator is divided by the number of samples (tips) since the last measurement
request (
a
M!
,
a
MC!
,
a
MC1!
,
a
C!
,
a
C1!
,
a
CC!
,
a
CC1!
, or
a
RC1!
command).
Avg_Intensity = accum_intensity_values / num_samples since last measurement request
(
a
M!
,
a
MC!
,
a
MC1!
,
a
C!
,
a
C1!
,
a
CC!
,
a
CC1!
, or
a
RC1!
command).
RainVUE-Series SDI-12 Precipitation Sensors
22
