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116

GMM112 Carbon Dioxide Module

for HVAC Applications

The Vaisala CARBOCAP

®

Carbon Dioxide Module GMM112 is a basic CO

2

measurement module.

Features/Beneﬁ ts

▪

Compact, OEM module for

demand-controlled ventilation

and other CO

2

measurement

applications

▪

Incorporates Vaisala

CARBOCAP®, the silicon based

NDIR sensor with unique

internal referencing

▪

Advanced, single-beam, dual

wavelength measurement with

no moving parts

▪

Excellent long-term stability

▪

Ideal for ventilation control in

all types of occupied spaces

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 CO

2

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

®

CO

2

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  lter measures CO

2

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 back-

ground CO

2

levels. In buildings with

around-the-clock occupancy (e.g.

hospitals, work-places, residential

buildings, retirement homes), the

assumed background CO

2

level

reference is simply not applicable.

The true internal reference

measurement of Vaisala CARBOCAP

®

CO

2

transmitters provides years of

stable CO

2

measurements.

The GMM112 Carbon Dioxide Module is

designed especially for DCV (Demand

Controlled Ventilation) applications

with three optional CO

2

measurement

ranges of 0…2000 ppm, 0…5000 ppm

and 0…10000 ppm.

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