Orion AQM/AQM+
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Columbia Weather Systems, Inc.
Limited Performance
Temperature and relative humidity can influence and distort the
measurement results. The AQM and AQM+ includes a sophisticated
compensation feature for eliminating the distortion in a non-condensing
environment. If the conditions change very fast (for example, the relative
humidity suddenly drops), there may be some measuring inaccuracy that
temporarily exceeds the specifications.
High relative humidity affects the laser particle counter (LPC). To
eliminate the effects, the AQM and AQM+ compensates for this, but
spikes may occur in PM10 measurement results in condensing
conditions.
Temperature
For the operating environment, measurement performance is fully
operational and within specifications for -22 to +104°F (-30 to +40°C) and
the limiting parameter is the electrochemical cell for gas measurements.
In temperature range -40 to +122°F (-40 to +50°C) the device stays
operational, but the measurements may not be fully within specifications.
Avoid direct sunlight in high temperatures for long periods of time.
For example, exposure to +122 °F (+50 °C) may damage the air quality
transmitter.
Humidity
The limiting factor in low <15 %RH is related to the electrochemical cell
drying and for high humidity values >95 %RH for the cell water
absorption.
High humidity (>95 %RH) also affects performance of the laser particle
calculator as the particles absorb water from the air and grow in size,
affecting the equivalent diameter, division between different size bins,
and mass. This effect is compensated to some extent, resulting in limited
performance.
Summary of Contents for Orion AQM
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