INTRODUCTION
1
Thank you for purchasing this portable
IAQ meter. The meter measures CO
2
level,CO level, air temp., dew point, wet
bulb temp. and humidity(DP, WB, RH are
for models 77597 only) and is an ideal
instrument for indoor air quality (IAQ)
diagnosis.
Poor indoor air quality is considered
unhealthy because it causes tiredness,
loss of ability to concentrate, and even
illness(ex. Sick Building Syndrome). IAQ
monitoring and survey, especially on CO
2
level and air ventilation become widely
applied in public areas such as offices,
classrooms, factories, hospitals and
hotels. It is also suggested in regulations
of industrial hygiene in some countries.
(Appendix)
The portable CO meter uses NDIR (non-
2
dispersive infrared) technology to ensure
the reliability and long term stability. It’s
useful in verifying HVAC system perform-
ance 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.
Maximum indoor air quality level per
ASHRAE Residential standards 62-1989
for living area is under 9ppm. Besides, it is
also necessary to remove employees from
enclosed space if the CO concentration
exceeds100ppm per OSHA exposure limit.
Please refer to Appendix for the details.
