Vaisala HUMICAP MMT310 Servisní příručka stáhnout pdf (Strana 108)

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106

GMW115 Carbon Dioxide Transmitter for

Demand-controlled Ventilation

The Vaisala CARBOCAP

®

Carbon Dioxide Transmitter GMW115 is a wall-mounted

CO

2

transmitter for demand-controlled ventilation.

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

Features/Beneﬁ ts

▪

Compact, wall-mounted

transmitter for demand-

controlled ventilation

▪

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

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 GMW115 Transmitter is designed

especially for DCV (Demand Controlled

Ventilation) applications with two

optional CO

2

measurement ranges of

0…2000 ppm and 0…5000 ppm.

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