UEi Test Instruments AQM4 User Manual
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INTRODUCTION
Thank you for purchasing the UEi AQM4 IAQ
meter. The meter measures CO² levels, CO
levels, air temperature, dew point, wet bulb
temperature, and humidity. The AQM4 is an
ideal instrument for indoor air quality (IAQ)
diagnosis.
Poor indoor air quality causes tiredness,
inability to concentrate, and even illness
(ex. Sick Building Syndrome). IAQ monitoring
and surveying especially for CO² levels
and air ventilation has become widely
applied in public offices, classrooms,
factories, hospitals, and hotels. It is also
recommended for regulating standards of
industrial air quality in some countries.
The portable AQM4 uses NDIR (non-
dispersive infrared) technology for CO²
measurement to ensure reliability and long-
term stability. It is useful in verifying HVAC
systems performance and air ventilation
control.
CO is a colorless, odorless, and tasteless
gas which is slightly lighter than air. It is
highly toxic to humans and animals. Carbon
Monoxide is measured using a long-life
electrochemical sensor.
Maximum indoor air quality CO level per
ASHRAE Residential standards 62-1989 for
living area is under 9ppm. It is necessary to
evacuate employees from enclosed spaces
if the CO concentration exceeds 100ppm per
OSHA exposure limit.