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112
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.
4-Carbon-Dioxide-Pages-100-119-Vaisala-Catalog-2011.indd 112 24.10.2011 9.21
113
66.3
60
60
Ø 4.2
66.7
85.3
83.4
85.2
R2.1
124
120.9
25.8
84
R3.5
Technical Data
Performance
CO
2
-measurement range 0 ... 2000 ppm
0.....5000 ppm
Accuracy (including repeatability, non-
linearity 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.
specifi cation
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
Housing
Material: ABS plastics
Colour: Cycolac 233599/NCS 0502-G50Y
Fire resistance: UL94 HB
Ingress protection: IP30
Dimensions
Dimensions in mm
Ref. B210568EN-D ©Vaisala 2009
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 specifi cations — technical included — are subject
to change without notice.
For more information, visit
www.vaisala.com or contact
us at sales@vaisala.com
4-Carbon-Dioxide-Pages-100-119-Vaisala-Catalog-2011.indd 113 24.10.2011 9.21
- HUMIDITY / DEW POINT / 1
- PRESSURE / WEATHER 1
- ACC URATE 2
- Humidity 4
- Dew Point 4
- Mounting Options 9
- Graphical Display of 10
- History and 10
- Measurement Trends 10
- Outputs and Power Supply 10
- Options for Every Need 10
- Flexible Installation 11
- For Moderate Humidities 11
- Vaisala HUMICAP® 12
- Performance 12
- Measurement Trends and 12
- Real Time History 12
- 41 (1.6) 13
- 51 (2.0) 13
- 192 (7.56) 13
- 253 (9.96) 13
- 37.5 (1.48) 14
- 79.5 (3.13) 14
- 99.5 (3.92) 14
- Temperature Transmitters 16
- HMP361 for wall mounting 17
- HMP363 for confined spaces 17
- HMP364 for high pressure 17
- HMP365 for high temperature 18
- HMP367 for high humidities 18
- HMP368 for pressurized 18
- Transmitter 22
- Interchangeable Probe 24
- Fast, On-Site Calibration 26
- Measures both Humidity 26
- Resistant to Chemicals 28
- Vaisala INTERCAP 30
- Humidity and Temperature 30
- Transmitter Series HMW80 30
- HVACApplications 32
- Demanding Applications 34
- Unique Warmed Probe 34
- Vaisala HUMICAP® Sensor 34
- Chambers 36
- Probe HMP60 38
- Vaisala HUMICAP 40
- Probe HMP110 40
- Three Probes 42
- MI70 Link 42
- Reliable and Cost-ecient 47
- HVAC Products 47
- Fast and Easy-to-Use 48
- HMK15 Humidity Calibrator 50
- DTR500 Solar Radiation 54
- Versatile Outputs and 61
- (Wireless) Data Collection 61
- Easy Installation 61
- Probe Specifications 62
- Ensure dry 65
- Measure Humidity Directly 66
- DMT345, Accurate in Hot 66
- OEM Applications 70
- Low Maintenance 72
- Dewpoint temperature (°C) 75
- DMT132 Dewpoint Transmitter 76
- DEW POINT 77
- CALCULATED VARIABLES 77
- Indoor Applications 78
- 110 (4 .33) 79
- 85 (3.35) 79
- 33 (1.30) 79
- DSS70A Portable 82
- Sampling System 82
- Sampling Cells for 82
- Pressurized Processes 82
- Online Reliability 86
- Savings Across the Board 86
- Risk-Free, Greener 86
- Solution 86
- The Fruit of Experience 86
- Multiparameter Transmitter 88
- When Moisture is a Problem 89
- Knowledge is Power 89
- Literally 89
- Transmitter Series for Oil 90
- Moisture in Oil 90
- The Vaisala HUMICAP 91
- Hand-Held 91
- R1/2" ISO7/1 92
- Prevent it 95
- Transmitter for Oil 96
- Features/Benefits 100
- Technical Data 101
- 0 ... 2 % 102
- Interchangeable Probes 104
- Demanding OEM Applications 106
- GMM111 Carbon Dioxide Module 108
- Vaisala CARBOCAP 110
- Technology 110
- Two Sampling Methods 110
- Features/Benefi ts 112
- Demand-controlled Ventilation 114
- GMM112 Carbon Dioxide Module 118
- GMM20W Carbon Dioxide Module 120
- Pressure 122
- PTU300 Models 123
- Mechanics 126
- Accessories 126
- Dimensions 126
- IN CONTROLLED ENVIRONMENTS 127
- Take the Lab to the Field 130
- For more information, visit 131
- Standard PTB330TS 132
- PTB210 Digital Barometer 134
- Calculate 137
- Vaisala BAROCAP® 138
- Accuracy and Stability 138
- Applications 138
- Ideal for outdoor 140
- Carefree maintenance 140
- Operating Environment 142
- Available Options 142
- Figure 1 143
- Figure 2 with Process 143
- Valve Actuator and 143
- Test Jacks 143
- Measuring Acoustic 146
- Precipitation 146
- Wind Measurement 150
- Vaisala Service Offering 152
- Accredited Body 153
- Accredited Parameters 153
- Vaisala Filters 154
- Vaisala Filters continued 155
- Vaisala Contact Information 158
- ASIA AND PACIFIC 159
- NORTH AMERICA 159
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