User manual

WXT520 Weather Transmitter
2
4.3 Barometric Pressure, Temperature, and Relative Humidity
The WXT520 has a PTU module that contains a capacitive silicon BAROCAP®
sensor for barometric pressure measurements, a capacitive ceramic
THERMOCAP® sensor for air temperature measurements, and a capacitive thin
film polymer HUMICAP® sensor for relative humidity measurements. The PTU
is housed in a naturally aspirated radiation shield that protects the PTU and
reflects solar radiation. Default units are °Celsius for temperature and hPa for
barometric pressure.
5. Specifications
5.1 Wind Speed
Measurement Range: 0 to 60 m s
-1
Accuracy: ±3% at 10 m/s
Response Time: 0.25 s
5.2 Wind Direction
Measurement Range: 0° to 360°
Accuracy: ±3°
Output Resolution: 1°
5.3 Precipitation
Rainfall: cumulative accumulation after latest automatic or
manual reset.
Accuracy: 5% (Due to the nature of the phenomenon, deviations
caused by spatial variations may exist in precipitation
readings, especially in short time scale. The accuracy
specification does not include possible wind induced
error.)
Collecting Area: 60 cm
2
Output Resolution: 0.01 mm (0.001 in)
Rain Duration: counting each ten second increment when droplet
detected.
Rain Intensity: one minute running average in ten second steps.
Rainfall Intensity Range: 0 to 200 mm hr
-1
(broader range possible with reduced
accuracy)
5.4 Barometric Pressure
Measurement Range: 600 to 1100 hPa (mbar)
Accuracy: ±0.5 hPa @ 0° to 30°C; ±1 hPa @ -52° to +60°C
Output Resolution: 0.1 hPa
5.5 Air Temperature
Measurement Range: -52° to +60°C
Accuracy: ±0.3°C @ +20°C
Output Resolution: 0.1°C
5.6 Relative Humidity
Measurement Range: 0 to 100% RH
Accuracy: ±3% RH @ 0 to 90% RH; ±5% RH @ 90 to 100% RH
Output Resolution: 0.1% RH