Dynamax InteliMet Advantage 6, Руководство пользователя, Страница: 37 / 62

Dynamax Inc
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4.4 CR200 Program for InteliMet Advantage 6 and ET computation
Every standard and custom InteliMet Advantage 6 weather station is tested at our factory and supplied
with a program to read sensors every minute, calculate average, compute ET and store to logger every
hour. This enables the user to simply power up the weather station and the unit starts collecting data as
long as all the sensors are connected and operating properly. In addition to this each system is supplied
with software CD containing CR200 program loaded into the logger and a test program. For example a
test program can read sensors every 5 seconds and calculate and store to logger memory every minute.
This test program is helpful as a learning tool for a new user as well as for testing the installation for any
problems. This is also a helpful tool in trouble shooting the weather station, sensors, cabling or
installation.
Even though InteliMet weather station is shipped ready to flip the switch and operate, we recommend the
user to modify the site specific constants/ variables to meet the geography of the location where the
station is setup, compile the program and send the new program to logger. These site specific variables
are,
Parameter Constant notation
in program
Description Units Default
Values
zom C_ZOM Height of measurement M 2.0
zot C_ZOT Roughness parameter for heat and vapor
profile (Default for ¾ “ turf grass) M 0.0005
lev C_LEV Latent heat of vaporization J/Kg 2.44 x10
6
has C_HAS Specific Air Heat capacity J/Kg.degC
at 30C 1004.0
In addition an advanced user familiar can experiment with timing loops in the program such as scan
interval and log interval.
Notation Description Units Default
Values
INT_SCAN Time interval in seconds between successive reading of the data
from meteorological sensors sec 60
INT_STORE Time interval in minutes at which to calculate average of the raw
weather variables, calculate ETP and store to logger memory
min 60
Program supplied with InteliMet Advantage 6 weather station has the above list of variables present at the
top of the program. Following is screen capture of the program IMET_MP2_Main.CR2 as viewed in CR
Basic editor.