Vaisala GMW115 Technical data

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GMW115 Carbon Dioxide Transmitter for Demand-controlled Ventilation

from the stable reference provided by the electrically tunable Fabry-Perot Interferometer (FPI).

The tunable FPI lter measures CO absorption, and simultaneously a reference wavelength. This internal reference measurement compensates effectively for any changes in the

The Vaisala CARBOCAP® Carbon Dioxide Transmitter GMW115 is a wall-mounted CO

transmitter for demand-controlled ventilation.

Features/Beneﬁts

Compact, wall-mounted

▪

transmitter for demandcontrolled 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

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 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 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

CO2

level is a

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 CO around-the-clock occupancy (e.g. hospitals, work-places, residential buildings, retirement homes), the assumed background CO reference is simply not applicable. The true internal reference measurement of Vaisala CARBOCAP CO

transmitters provides years of

stable CO

The GMW115 Transmitter is designed especially for DCV (Demand Controlled Ventilation) applications with two optional CO 0…2000 ppm and 0…5000 ppm.

levels. In buildings with

measurements.

measurement ranges of

level

66.3

Ø 4.2

66.7

85.3

83.4

85.2

R2.1

124

120.9

25.8

R3.5

Technical data

Performance

CO2-measurement range 0 ... 2000 ppm

0.....5000 ppm

Accuracy (including repeatability, nonlinearity and calibration uncertainty)

±(2 % of range + 2 % of

reading) Long-term stability ± 5 % of range/5 years Response time T90 1 min Temperature dependence, typical -0,35 % of reading / °C Pressure dependence, typical +0,15 % of reading/hPa Warm-up time 1 min, 10 min for full.

speciﬁcation

Product lifetime > 10 years

Operating environment

Temperature -5 ... +45 °C (23 ... 113 °F) Humidity 0 ... 85 % RH Pressure 700 ... 1200 hPa Electromagnectic compatibility

Complies with EMS standard EN61326-1, Generic Environment

Inputs and outputs

Operating voltage 24 V (±20 %) AC/DC Power consumption <2 W Outputs 4 … 20 mA, 0 … 10 V,

RS-485, 2-wire, non-isolated

Dimensions

Dimensions in mm

Housing

Material: ABS plastics Colour: Cycolac 233599/NCS 0502-G50Y Fire resistance: UL94 HB Ingress protection: IP30

For more information, visit www.vaisala.com or contact us at sales@vaisala.com

This material is subject to copyright protection, with all copyrights retained by Vaisala and its individual partners. All rights reserved. Any logos and/or product names are trademarks of Vaisala or its individual partners. The reproduction, transfer, distribution or storage of information contained in this brochure in any form without the prior written consent of Vaisala is strictly prohibited. All speciﬁcations — technical included — are subject to change without notice.