4. Sensor ranges and accuracy

Following table gives an overview of sensor ranges and their precision for Davis VantagePro weather stations. Since Davis hardware evolved over time, values apply for latest models (2012). Older models may have slightly different lower and upper bounds for several parameters. However, for our applications these differences are hardly relevant. Same holds for differences in the sensitivity of specific sensors between models.

4.1. Indoor sensors

These are the sensors integrated in the weather station console:

Variable	Ranges	Accuracy	Units
Temperature	0 < IT < 60	± 0.1	°C
Relative humidity	10 < IRH < 90	± 1	%
Barometer	880 < P < 1080	± 0.1	hPa

4.2. Outdoor sensors

These sensors are integrated in the weather station base station:

Variable	Ranges	Accuracy	Units
Temperature	-40 < OT < 65	± 0.1	°C
Relative humidity	0 < ORH < 100	± 1	%
Wind speed	1 < WS < 68	± 0.5	m/s
Wind direction	0 < WD < 360	± 1 0	°
Rain rate	0 < RR < 1999.9	± 0.25	mm/hr

Additional outdoor sensors (optional):

Variable	Ranges	Accuracy	Units
Solar radiation	0 < SR < 1800	± 1	W/m2
UV	0 < UV < 16	± 0.1	UV

4.2.1. Derived quantities

Using the outdoor sensors these quantities are derived:

Variable	Ranges	Accuracy	Units
Evapotranspiration rate	0 < ET < 999.9	± 0.25	mm
Heat index	-40 < HI < 57	± 1	°C
Dew point	-76 < DP < 54	± 1	°C
Wind chill	-84 < WD < 51	± 1	°C

4.3. Calibration

The barometer readings can be adjusted/calibrated to following altitude and pressure ranges:

Variable	Ranges	Accuracy	Units
Elevation	-600 < EL < 4500	1	m
Barometer	650 < P < 1080	0.1	hPa