Vaisala   Rion   Wolfsense   Honeywell
GMM112 Carbon Dioxide Module
for HVAC Applications
Most of us spend 90% of our time
indoors. Consequently, good indoor
air quality is important to our
wellbeing. All human beings produce
carbon dioxide gas by respiration,
thus the carbon dioxide level can
be used as an indicator for indoor
human presence. A high CO2 level is a
sign of poor ventilation and often an
indication of other unpleasant odors
in the air. In many buildings the
ventilation need varies throughout
the day. Demand controlled
ventilation is an economical way to
ensure good air quality.
The Vaisala CARBOCAP® CO2
sensors have been proven to be
accurate and durable. They have
an excellent long-term stability,
which decreases maintenance. The
superior performance of Vaisala
CARBOCAP® sensors results largely
from the stable reference provided by
the electrically tunable Fabry-Perot
Interferometer (FPI).
The tunable FPI fi lter measures CO2
absorption, and simultaneously a
reference wavelength. This internal
reference measurement compensates
effectively for any changes in the
optical path, such as light source
intensity changes and contamination.
In the HVAC market, this type of
reference measurement is a unique
feature to Vaisala CARBOCAP®
products, distinguishing them
from competitors’ comparative
products that do not have a reference
measurement at all, or have an
indirect reference measurement,
which is based on an assumed background
CO2 levels. In buildings with
around-the-clock occupancy (e.g.
hospitals, work-places, residential
buildings, retirement homes), the
assumed background CO2 level
reference is simply not applicable.
The true internal reference
measurement of Vaisala CARBOCAP®
CO2 transmitters provides years of
stable CO2 measurements.
The GMM112 Carbon Dioxide Module is
designed especially for DCV (Demand
Controlled Ventilation) applications
with three optional CO2 measurement
ranges of 0…2000 ppm, 0…5000 ppm
and 0…10000 ppm.
GMM 112
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