Campbell Scientific CS125 Present Weather Sensor - Manual (Page 11)

User Guide
3
2. Technical specification
Minimum
Value
Nominal
Value
Maximum
Value
Visibility characteristics
Reported Visibility (metric) 12 metres - 32,000
metres
Reported Visibility (imperial) 39 feet - 104,985
feet
Visibility accuracy up to 10,000m - +/-10% -
Visibility accuracy up to 20,000m - +/-20% -
Optical characteristics
LED centre wavelength - 850nm -
LED spectral bandwidth - +/-35nm -
Pulse characteristics
Light pulse rate - 1KHz -
3. Electrical specification
Minimum
Value
Nominal
Value
Maximum
Value
Main power supply for DSP and dew heaters
Power supply, +12V connection (DC
only) 9V 12V 28V
(1)
Current consumption sampling
continuously with dew heaters active
(at 12V DC) - 200mA 248mA
Current consumption sampling
continuously with dew heaters
disabled (at 12V DC) - 110mA 151mA
Current consumption without any
sampling occurring and dew heaters
disabled (at 12V DC) - 21mA 30mA
Active power consumption with dew
heaters and RS232 communications
interface active
(2,3)
(at 12V DC)
- 200mA 250mA
Hood heater power supply
Hood heater voltage (AC or DC) - 24V
(3)
30V
(4)
Hood heater wattage (at 24V AC or
DC) - 60W
(5)
-
RS232 Communications
RS232 input threshold Low 0.8V 1.5V -
RS232 input threshold High - 2.0V 2.4V
RS232 input absolute maximum -15V - +15V
RS232 input resistance 12K

- -
RS232 output voltage low - - 0.4V
Weather characteristics
Precipitation Sensitivity - 0.05 mm/h -