Basic Weather Station BWS-200
A-2
CS300 Pyranometer (Optional - required for ETo Calculations)
G: Clear
Ground: Black
SE2: Red
CS100 Barometric Pressure Sensor (Optional)
B: Red
G: Black
C2: Green
G: Clear
Ground: Yellow
SE3: Blue
A.3 Measurements
Each time a sensor is scanned, the result is stored as a
Public
variable. With each
scan, the value of each
Public
variable is processed then overwritten with the next
measurement result.
* Must have ARG100 Tipping bucket rain gauge connected for valid reading
** Must have CS300 Solar radiation Sensor connected for valid reading
*** Must have CS100 Setra Barometric pressure Sensor connected for valid reading
Public Variables
Variable Name
Typical Value
Explanation
The program measures the following raw signals:
Batt_Volt
12.794 Battery Voltage (Volts)
Air_TC
24.232 Air Temperature (Degrees Celsius)
RH
49.771 Relative Humidity (percent)
WS_ms
2.525 Wind Speed (ms
-1
)
Wind Dir
205.501 Wind Direction (Degrees clockwise from True
North)
Rain_mm 0.00
Precipitation
(mm)
*
Solar_W
10.8 Solar Radiation (Watts) **
BP_mBar 1014
Barometric
Pressure (Millibars) ***
It then calculates in real time the following derived values:
Solar_kJ
5 Total Solar Radiation (KiloJoules) **
WindRun_m
25.250 Run of wind passing sensor during scan period
(metres)
TdC
13.101 Dew point (degrees Celsius)
