Columbia Weather Systems Orion AQM, Руководство пользователя

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14 Orion AQM/AQM+
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Columbia Weather Systems, Inc.
Principles of Measurements
The gas measuring technology in the AQM is based on proprietary
advanced algorithms and electrochemical technology. The sampled gas
causes a reduction or oxidation reaction in an electrochemical cell. Both
reactions create a weak electric current. The electric current is directly
dependent on the volume of measured gas. By measuring the electric
current and using advanced calculation and compensation algorithms,
the AQM calculates the gas content. Most electrochemical cells are
highly susceptible to ambient conditions (temperature and humidity), but
the AQM reverses the impact with a proprietary adjustment and
compensation system, which guarantees accurate ppb measurements.
The laser particle counter sensor technology in the AQM+ is based on
the scattering of laser light caused by passing particles. With the help of
optics and photosensitive sensors, the laser particle counter measures
the angular scattering intensity data and analyzes it with digital signal
processing (DSP). The method allows simultaneous measuring of two
particle sizes, <2.5 μm and <10 μm.
The measurements of the particle counter are based on the number of
particles sampled and averaged over a period of 60 seconds and the
default measurement interval is 10 minutes.
The CPU of the air quality monitor regularly controls the sampling pump
to transfer outside air into the gas analysis module for measuring.
Temperature is measured using a semiconductor sensor. It is used for
general purpose monitoring and to reduce the effects of ambient
conditions on the gas measurements.
Relative humidity is measured using capacitive technology. It is used for
general purpose monitoring and to reduce the effects of ambient
conditions on the gas measurements.
Barometric pressure is measured using a MEMS sensor. It is used for
general purpose monitoring and to reduce the effects of ambient
conditions on the gas measurements.
All the AQM sensors are housed in a self-aspirating 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.