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GMD/W20 Series Carbon Dioxide Transmitters
for Demand Controlled Ventilation Applications
The duct mounted Vaisala
CARBOCAP
®
Carbon Dioxide
Transmitter Series GMD20 and
wall mounted GMW20 are specially
designed for Demand Controlled
Ventilation (DCV). They are easy to
install and require no maintenance.
The recommended calibration
interval is ve years.
Vaisala CARBOCAP®
Technology
The GMD/W20 Series Transmitters
use the silicon-based Vaisala
CARBOCAP
®
Sensor. The simple
structure and reference measurement
capabilities make this Single-Beam,
Dual-Wavelength NDIR sensor
extremely stable and reliable.
The temperature and ow
dependences of the sensor
are negligible. In addition, the
measurement accuracy is not
The GMD/W20 series transmitters are designed for use in ventilation-related
applications.
affected by dust, water vapor and
most chemicals.
Versatile Transmitters
The GMD/W20 series transmitters
can be used independently, or
incorporated into building energy
management systems. The series
consists of duct mount units
GMD20/D and wall mount units
GMW21/D and GMW22/D. Version D
has a display. The two sizes in the
wall-mount series make them easy
to install for most standard junction
boxes.
The duct units' compact sensor head
design requires only a small hole in a
ventilation duct, thereby minimizing
the risk of leaking gaskets and
measurement errors.
In addition to the standard
0 ... 20 mA, 4 ... 20 mA and 0 ... 10 V
outputs, there are three other
options: two LonWorks
®
interfaces
and a relay output. The relay output
is standard with the display units.
Improve Indoor Air at
Minimal Energy Costs
The use of the GMD/W20 series
transmitters ensures the best
possible control of air quality and
results in considerable savings in
energy consumption, maintenance
and recalibration costs.
Temperature Option
The GMA20T temperature module,
an option with the GMW21 wall
mount unit, combines both CO
2
and
temperature measurement into one
transmitter. The GMA20T has an
output of 0 ... 10 V corresponding to a
temperature range of 0 ... +50 °C
(+32 ... +122 °F).
Features/Benefi ts
▪
Versatile transmitters
▪
Duct and wall mount models
▪
Incorporates Vaisala
CARBOCAP® Sensor - the
silicon-based NDIR sensor
▪
Excellent long-term stability
▪
Negligible temperature
dependence
▪
Ease of installation
4-Carbon-Dioxide-Pages-100-119-Vaisala-Catalog-2011.indd 114 24.10.2011 9.22
115
Technical Data
Performance
CARBON DIOXIDE MEASUREMENT
Measurement range 0 ... 2000 ppm
(nominal; can be calibrated for other ranges:
0 ... 5000 ppm, 0 ... 10,000 ppm, 0 ... 20,000 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 (63%) 1 minute
Warm-up time 1 minute, 15 minutes full specifi cations
TEMPERATURE MEASUREMENT (OPTIONAL WITH GMW21)
Output signal 0 ... 10V
Corresponding measurement range 0 ... +50 °C (+32 ... +122 °F)
Accuracy at +25 °C ±0.5 °C (0.9 °F)
Warm up time 30 min
Temperature sensor Semiconductor IC
Accessories and Options
Display and relay option for GMD/W21/22 GMI21
Relay output option GMR20
LonWorks
®
module with CO
2
signal GML20
(Not available when display option is added)
LonWorks
®
module with both CO
2
signal
and temperature signals GML20T
(Not available when display option is added)
Serial COM adapter 19040GM
Analog temperature module for GMW21
(not available when display option is added) GMA20T
Hand-held meter for fi eld verifi cation GM70
Operating Environment
Temperature -5 ... +45 °C (+23 ... +113 °F)
Humidity 0 ... 85 %RH, non-condensing
Flow velocity (GMD20) 0 ... 10 m/s
Electromagnetic compatibility EN61326-1, Generic Environment
Mechanics
Housing material ABS plastic
Housing classifi cation (GMD20 electronics housing) IP65
Housing colour GMW21/22 NCS 0502-G50Y
Weight:
GMD20 (D) 140 g (170 g)
GMW21 (D) 100 g (130 g)
GMW22 (D) 90 g (120 g)
Inputs and Outputs
Outputs 0 ... 20 or 4 ... 20 mA and 0 ... 10 V
Optional outputs relay
LonWorks
®
interface
Resolution of analog outputs 8 bits
Recommended external load:
current output max. 500 ohm
voltage output min. 1 kohm
Operating voltage nominal 24 VAC/DC (18 ... 30 VDC)
Connections screw terminals, wire size 0.5 ... 1.5 mm
2
Power consumption <2.5 W
Ref. B210910EN-A ©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
Dimensions
Dimensions in mm
GMD20 and GMD20D
GMW21 and GMW21D
GMW22 and GMW22D
CARBOCAP
®
is a registered trademark of Vaisala.
42
22
42
80
108.5
60
83
66.7
60
4-Carbon-Dioxide-Pages-100-119-Vaisala-Catalog-2011.indd 115 24.10.2011 9.22
- 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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