USER'S GUIDE____________________________________________________________________
60 __________________________________________________________________ M210543EN-E
HEAVY SNOW LIMIT ( 600)
LIGHT SNOW LIMIT ( 1200)
DRD SCALE ( 1.0)
where
Precipitation limit = The threshold of accumulated particle
magnitudes (in PWD22/52 internal units) to
report the precipitation state 'on'. A typical
parameter value is 20 to 60 (max. 255). A
smaller value is more sensitive operation
and faster response at the beginning of an
event. and it is also more sensitive to false
rain and snow reports.
Weather update delay = A time as multiple of 15 seconds, during
which the instant precipitation type is not
changed. The intensity may change faster.
Synop haze limit = Maximum visibility when mist or haze is
reported.
Metar haze limit = Maximum visibility when mist or haze is
reported.
Rain intensity scale
= It is multiplied by the measured raw
intensity gives the reported precipitation
intensity (optical). The rain amount is scaled
with the same coefficient because the
amount is a direct integral of 15-second
intensities.
A typical value for the Rain intensity scale is
1.0. Since the optimal value depends on the
optical, optoelectronic, and electronic
parameters in a very complex way, no
applicable factory calibration method has
been developed yet.
Heavy rain limit = The minimum rain intensity (mm/h), when
the intensity is reported as heavy.
Light rain limit = The maximum rain intensity (mm/h), when
the intensity is reported as light. If rain
intensity is between the above heavy and
light limits, it is reported as moderate.
Snow limit
= The minimum ratio of optical precipitation
intensity to surface sensor (RAINCAP
®
)
precipitation intensity, when precipitation is
snow.
A typical value for Snow limit is 5. Smaller
value directs PWD22/52 to report more wet
precipitation as snow.
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