Vaisala INTERCAP HMDW80 SERIES Spezifikationen PDF herunterladen (Seite 148)

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146

GMM112 Carbon Dioxide Module

for HVAC Applications

The Vaisala CARBOCAP

®

Carbon Dioxide Module GMM112 is a basic CO

2

measurement module.

Features/Benefits

▪

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

The Vaisala CARBOCAP® Carbon

Dioxide Module GMM112 is a compact

module for measuring ppm (parts

per million) levels of carbon dioxide.

The GMM112 module is designed

for indoor use in demand controlled

ventilation and other applications

requiring carbon dioxide control.

The GMM112 has three optional

ranges to select from: 0…2 000 ppm,

0…5 000 ppm and 0…10 000 ppm.

The selectable analog (current and

voltage) and digital outputs make it

easy to integrate to various control

systems. The GMM112 modules are

easy to install and need practically

no maintenance.

Proven Performance with

the Vaisala CARBOCAP®

Sensor

The GMM112 module includes Vaisala

CARBOCAP

®

carbon dioxide sensor, a

silicon-based infrared (IR) absorption

sensor. The excellent long-term

stability of the CARBOCAP® sensor

results from its unique measurement

technology. The sensor features

an electrically tunable Fabry-Perot

Interferometer for built-in reference

measurement. The sensor not

only measures CO2 absorption but

also a reference, which makes it

possible to compensate for potential

light intensity variations and

contamination and dirt accumulation

in the optical path, making the sensor

extremely stable over time.

CARBOCAP sensor has no need

for any compensation algorithms

that are used in more simple

sensors to compensate for their

drift. In applications with constant

elevated levels of carbon dioxide

and in buildings with around-the-

clock occupancy (e.g. hospitals,

manufacturing facilities, residential

buildings, and retirement homes) the

compensations based on assumed

background carbon dioxide level

simply do not work.

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