Biral SWS-100-LW: SWS-200-LW, Руководство пользователя

Страница: 62 / 75

Product Overview Section 6
52
Automated Measurements
Precipitation/Obstruction to Vision Measurements
Function Details
(a) Liquid Precipitation:
(Minimum Detection Limit)
0.00025 mm/min (0.00001 in/min).
0.015 mm/hr (0.00060 in/hr).
(b) Snow (H
2
0
Equivalent):
(Minimum Detection Limit)
0.000025 mm/min (0.000001 in/min).
0.0015 mm/hr (0.000060 in/hr).
Identification/Intensity:
SWS-200 – LW only
Drizzle: Light/Moderate/Heavy.
Rain: Light/Moderate/Heavy.
Snow: Light/Moderate/Heavy.
Hail
Precipitation rate:
Rain – Up to 500 mm/hr (20 in/hr).
Snow – Rain Equivalent up to 500 mm/hr (20
in/hr).
Obstruction to vision:
Haze
Fog
Table 6-2 Precipitation Measurement Capabilities
In the presence of precipitation, the sensor software measures the fraction of the
atmospheric extinction coefficient due to precipitation and subtracts it from the
total extinction coefficient to obtain a quantity we have named EXCO-EVENTS. If
the value of EXCO-EVENTS is greater than 3.00, then fog is declared to be
present in addition to the precipitation as an obstruction to vision.