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Orion 420 Weather Station 13
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Columbia Weather Systems, Inc.
Relative humidity measurement is based on a capacitive thin film polymer HUMICAP®180 sensor. The
sensor is highly accurate with negligible hysteresis and excellent long-term stability in a wide range of
environments.
Radiation Shield: This module is mounted in a specially-designed radiation shield which protects the
sensors from both scattered and direct sunlight and precipitation. The composite material in the plates
offers excellent thermal characteristics and UV stabilized construction. The white outer surface reflects
radiation, while the black inside absorbs accumulated heat.
The internal sensor module is easily replaceable and readily available as a spare component. To order a
replacement module, please use catalog no. 9581.
Rainfall Measurement
Rainfall is measured with an impact sensor, which detects the size and impact of individual rain drops.
The signals resulting from the impacts are proportional to the volume of the drops. Hence, the signal from
each drop can be converted directly to the accumulated rainfall.
This measurement method eliminates flooding and clogging, as well as wetting and evaporation losses.
The sensor transmitter uses RAINCAP® sensor 2 technology in precipitation measurement.
The precipitation sensor is comprised of a steel cover and a piezoelectric sensor mounted on the bottom
surface of the cover.
The precipitation sensor detects the impact of individual raindrops. The signals from the impact are
proportional to the volume of the drops. Advanced noise filtering technique is used to filter out signals
originating from other sources than raindrops.
The measured parameter is accumulated rainfall. Detection of each individual drop enables computing of
rain amount with high resolution.