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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
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
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 GMM112 Carbon Dioxide Module is
designed especially for DCV (Demand
Controlled Ventilation) applications
with three optional CO
2
measurement
ranges of 0…2000 ppm, 0…5000 ppm
and 0…10000 ppm.
mA
V
0
B
A
0
24V
mA
V
0
B
A
0
24V
25656
30
60
96
Ø3.2
Technical data
Performance
CO
2
-measurement range 0 ... 2000 ppm
0 ... 5000 ppm
0 ... 10000 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.
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 EN61326-1:1997 + Am1:1998,
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
Ref. B210567EN-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 specifications — technical included — are subject to change
without notice.
For more information, visit
www.vaisala.com or contact
us at sales@vaisala.com
- HUMIDITY / DEW POINT / 1
- Vaisala – at your service 3
- Building Automation 5
- Cleanrooms and Chambers 5
- Humidity 7
- 37.5 (1.48) 9
- 78.5 (3.09) 9
- 98.5 (3.88) 9
- Ø 12 (0.47) 9
- 120 (4.72) 10
- 170 (6.69) 10
- 41 (1.61) 10
- Duct installation kit 11
- Temperature Transmitters 12
- Transmitter 15
- Indoor Applications 17
- Chambers 22
- Vaisala INTERCAP 23
- Humidity and Temperature 23
- Probe HMP60 23
- Vaisala HUMICAP 24
- Probe HMP110 24
- HMI41 Indicator and 26
- HMP46 High Temperature Probe 26
- Performance 29
- Interchangeable Probe 29
- Available Options 29
- Technical Data 30
- HMK15 Humidity Calibrator 31
- DTR500 Solar Radiation and 33
- Precipitation Shields 33
- The Vaisala HUMICAP 36
- Transmitter Series HMW80 37
- HVAC Applications 39
- WITH OPTIONAL CURRENT MODULE 40
- **0 … 20 mA (R 40
- 1/8"-27 NPT 41
- Ensure dry 43
- OEM Applications 46
- Transmitter Series for Oil 51
- Moisture in Oil 51
- Prevent it 53
- Transmitter for Oil 54
- 0 ... 2 % 57
- Demanding OEM Applications 59
- GMM111 Carbon Dioxide Module 60
- Demand-controlled Ventilation 62
- GMM20W Carbon Dioxide Module 65
- GML20 and GML20T 66
- Process Measurements 67
- Humidity and 68
- Measurement 68
- Environments 68
- Hazardous Areas 69
- PTU300 Models 70
- Barometric Pressure 70
- Reliable and accurate 72
- HVAC solutions 72
- Take the lab to the field 74
- Standard PTB330TS 75
- PTB210 Digital Barometer 76
- Wind Measurement 81
- Vaisala Service Oering 82
- Vaisala Service Offering 82
- Your Warranty 83
- PRICE LIST 84
- DMT132 Dewpoint Transmitter 85
- Datasheet – front 85
- Vaisala Filters 89
- Vaisala Filters continued 89
- Order Guides 90
- Note: The Universal AC 91
- For high temperatures 92
- For high humidities 93
- For wall mounting 95
- For general use 96
- With Two Standard Chambers 101
- For Pressurized Processes 103
- DMT345 Dewpoint Transmitter 104
- DMT152 Dewpoint Transmitter 105
- DMT242 Dewpoint Transmitte 106
- For pressurized pipelines 108
- GMT221 and GMT222 CO 109
- Transmitters 109
- OMT355 Oxygen Transmitter 110
- 1 Transmitter type 111
- (-40...+140 °F) 112
- (-4...+140 °F) 112
- (+32...+140 °F) 112
- Order Guide 114
- Features/Benefits 115
- Technical data 116
- 3 Cable length 1.0 m 117
- PTB110 Barometer 118
- WXT520 Weather Transmitter 119
- Vaisala Contact Information 121
- ACCURATE 122
- For more information, visit 123
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