Table 15, Relative humidity, Table 16 – Vaisala WXT520 User Manual
Page 143: Precipitation, Table 15 relative humidity, Table 16 precipitation

Chapter 11 ____________________________________________________ Technical Specifications
VAISALA______________________________________________________________________ 141
Table 15
Relative Humidity
Property
Description/Value
Range
0 ... 100 %RH
Accuracy
±3 %RH at 0 ... 90 %RH
±5 %RH at 90 ... 100 %RH
Output resolution
0.1 %RH
PTU Measuring interval
1 ... 3600 s (= 60 min), at one second steps
Table 16
Precipitation
Property
Description/Value
Rainfall
cumulative accumulation after the latest
auto or manual reset
collecting area
60 cm
2
output resolution
0.01 mm (0.001 in)
field accuracy for daily
accumulation
better than 5 %
1
, weather dependent
units available
mm, in
Rain duration
counting each 10-second increment
whenever droplet detected
output resolution
10 s
Rain intensity
running one minute average in 10-second
steps
range
0 ... 200 mm/h (broader range with reduced
accuracy)
units available
mm/h, in/h
Hail
cumulative amount of hits against collecting
surface
output resolution
0.1 hit/cm
2
, 1 hit/in
2
, 1 hit
units available
hits/cm
2
, hits/in
2
, hits
Hail duration
counting each 10-second increment
whenever hailstone detected
output resolution
10 s
Hail intensity
one-minute running average in 10-second
steps
output resolution
0.1 hit/cm
2
h, 1 hit/in
2
h, 1 hit/h
units available
hits/cm
2
h, hits/in
2
h, hits/h
1. 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.