CO2 Carbon Dioxide Sensors and Transmitters - Vaisala
CO2 Carbon Dioxide Sensors and Transmitters
Vaisala’s carbon dioxide instruments are suited to a wide range of applications from fermentation and fruit storages to safety and ventilation control.
Carbon Dioxide Measurement Products in Brief:
- Transmitters, modules, and handheld meters
- Both ppm and percentage level carbon dioxide measurements
- Proprietary CARBOCAP® sensor
- Measurement based on infrared absorption of carbon dioxide
Benefits:
- Superior stability with built-in reference measurement
- Minimal maintenance and calibration requirements
- Insensitive to dust, water vapor, and most chemicals
- Insensitive to changing air flow
Information about 4-20mA Current Loops (this site, opens in a new tab)
NDIR = Non-Dispersive Infra Red (makes the sensor highly gas specific)
Prefer a printable PDF catalog? Download the Vaisala PDF Catalog (pdf, opens in a new tab)
NOTE: Products marked with “Configuration code required” need a product configuration form to be completed along with your order. The configuration code instructs our factory how you need the product configured such as scaling, outputs, cable lengths, mounting options etc. All configured products are made specifically to your order and most are delivered within 2 weeks (subject to occasional factory delays). Should you have any questions or need any support completing a configuration form, please contact our office.
Prices do not include GST and may change without notice.
On this page:
- GMP343 Carbon Dioxide Probe for Ecological Measurements
- GMP231 CO₂ Probe
- GMP251 Compact % Level CO₂ Probe for demanding use
- GMW80 Series CO₂ and Temperature Transmitters
- GMW90 For HVAC Use CO₂ only, up to CO2+RH+T
- GM20 Series Carbon Dioxide Transmitters for Demand Controlled Ventilation
- GM70 Hand Held CO₂ Meter
- GMM220 Series – GMM221 & GMM222
- GMM110 Series
Other related pages:
- Temperature, Humidity & Pressure instruments – Vaisala
- Barometric Pressure Sensors Differential Pressure – Vaisala
- Weather and Wind Sensors – Vaisala
- Dew Point instruments – Vaisala
- Moisture in Oil Sensors – Vaisala
- Temperature, Humidity, Barometric Pressure Sensors – Rika
- Wind sensors – Rika
- Multi-Parameter Weather Sensors – Rika
How to Measure Carbon Dioxide (pdf, opens in a new tab)
Carbon dioxide measurement is required in many applications – building automation, greenhouses, to life science and safety. This document covers the following topics:
- Operation principle of infrared carbon dioxide (CO2) sensors
- The ideal gas law and how to use it to compensate the CO2 measurement for environmental factors
- Optimal locations for CO2 transmitters
- Safety issues related to CO2
CARBON DIOXIDE MEASUREMENT APPLICATIONS
For Food Technology, Horticulture, Environment
High concentrations of carbon dioxide results in unconsciousness and even death, see below.
As high concentrations of CO2 are clearly hazardous, most countries have set exposure limits in the workplace. In Great Britain, for instance, the weighted average exposure limit for an 8 hour working day is 5000 ppm; a higher limit of 15,000 ppm applies to an exposure up to 10 minutes.
Applications where carbon dioxide can rise to dangerous levels include the brewing and carbonated drinks industries, food freezing using dry ice, cold storage, cargo ships, and, of course, plants where CO2 or dry ice is produced or handled.
Air Quality and Ventilation
Even when the carbon dioxide concentration is not high enough to cause problems, it is a good indicator of indoor air quality in general. A high CO2 level is usually a sign of poor ventilation and the presence of odours and other pollutants such as volatile organic compounds (VOCs).
Poor ventilation also increases the risk of high humidity and in the worst case, a radon build-up in the building.
Demand Controlled Ventilation (DCV) is often based on carbon dioxide measurement. Higher concentrations of CO2 indicate the presence of people in the room.
Beneficial Effects in Greenhouses
On the positive side, carbon dioxide can enhance plant growth. In greenhouses and mushroom farms, the growth rate and development of mushrooms and plants – from cucumbers to most luxurious roses – can be improved by controlling the concentration of carbon dioxide.
This raises the productivity and quality of the crops. In some cases, the CO2 concentration is used to control when fruits and vegetables ripen. The concentration of CO2, however, must be carefully adjusted. If the carbon dioxide level rises too high, the plants can be damaged or their growth stunted.
Food Packaging
Adding carbon dioxide to food packaging can considerably extend the storage and shelf life of meat, cheese as well as fruit and vegetables. In meat packaging, for example, a high concentration of CO2 in the packaging inhibits bacterial growth and retains the natural coloring of the meat.
Effect of Different Levels of CO₂ on People
| Concentration | Effect |
| 350 – 450 ppm | Typical atmospheric concentration |
| 600 – 800 ppm | Acceptable indoor air quality |
| 1,000 ppm | Tolerable indoor air quality |
| 5,000 ppm | Average exposure limit over 8 hours |
| 6,000 – 30,000 ppm | Concern, short exposure only |
| 3 – 8% | Increased respiration rate, headache |
| > 10% | Nausea, vomiting, unconsciousness |
| > 20% | Rapid unconsciousness, death |
CO2 Carbon Dioxide Sensors
GMP343 Carbon Dioxide Probe for Ecological Measurements
Typical applications include CO2 soil respiration, ambient CO2 monitoring, plant growth chambers, and OEM applications. The GMP343 incorporates a single-beam, dual-wavelength CO2 measurement with no moving parts.
The GMP343 can output both numerically filtered and raw measurement data and it can also compensate the measurement with an internal temperature measurement and user-set relative humidity, pressure and oxygen values. In combination with the handheld GM70, the GMP343 provides a tool for accurate in-situ measurement. The GM70 can be used as a display, communication and data logging device.
Each GMP343 is calibrated using ±0.5 % accurate gases at 0 ppm, 200 ppm, 370 ppm, 600 ppm, 1000 ppm, 4000 ppm and 2 %. Calibration is also done at temperature points of -30 °C, 0 °C, 25 °C and 50 °C. If needed, the customer can re-calibrate the instrument using the multipoint calibration (MPC) feature allowing up to 8 user-defined calibration points.
- Excellent accuracy and stability
- Vaisala CARBOCAP® Sensor, a silicon-based non-dispersive infrared (NDIR) sensor
- A single-beam, dual-wavelength CO2 measurement with no moving parts
- Compensation options for temperature, pressure, humidity and oxygen
- Wide operating temperature and humidity ranges
- Diffusion and flow-through models
- For harsh environments
Key Benefits
The GMP343 is a small, lightweight but rugged diffusion-aspirated or flow-through CO2 probe with low power consumption and heat emission designed for use in harsh environments, especially outdoors, which reduces the operating costs.
Data sheet on GMP343 Carbon Dioxide Probe (pdf, opens in a new tab)
Order form showing options for GMP343 (pdf, opens in a new tab)
| Part No | Product Detail |
|---|---|
| GMP343A | CO2 Probe, diffusion aspiration |
| GMP343B | CO2 Probe, flow through aspiration |
Spare Parts for GMP343
GMP343: Spare Parts and Accessories
Accessories: Spare Parts
GMP343BRACKET Mounting bracket, spare part
GMP343FLANGE Probe mounting flange for GMP343, spare part-
GMP343FILTER Dust filter including filter cover for GMP343,spare part
215521 PTFE filter for GMP343, spare part
GMP343ADAPTER Calibration adapter for GMP343A (the diffusion model)
JUNCTIONBOX-8 Junction box with 8-contacts, spare part
GMP343Z200SP 2m Probe Cable for GMM220 and GMP340
GMP343Z600SP 6m Probe Cable for GMM220 and GMP340
GMP343Z1000SP 10m Probe Cable for GMM220 and GMP340
213379 PC Connection Cable
DRW216050SP Connection cable for MI70, spare part
219686 USB Cable D9, RS-232
215519 Soil Adapter Kit – Horizontal Positioning of GMP343
215520 Soil Adapter Kit for Vertical Positioning of GMP343
19446ZZ RS232 Serial Interface Cable with D9 Female Connector
GMP231 CO₂ Probe for CO₂ incubators
The GMP231 probe is based on Vaisala’s patented CARBOCAP® technology and a new type of infrared (IR) light source.
The GMP231 probe’s sensor performance is optimized at 5 % CO2 but the sensor measures CO2 up to 20 % with high accuracy. The GMP231 is t’s installed through the incubator wall; only the IR sensor and optical components are exposed to the incubation environment.
In addition, the GMP231 can measure pressure and temperature for CO2 measurement compensation purposes, ensuring the product remains stable and accurate in all CO2 incubation conditions.
The sensor is made of highly durable materials to achieve outstanding stability over both time and temperature. Since water vapor, dust, and most chemicals do not affect measurements, the GMP231 module is ideal for CO2 incubator environments.
Features:
- Probe durable during heat sterilization up to +180°C (+356°F)
- Based on the latest infrared CO2 sensor technology
- Designed for OEM use in CO2 incubators – installation options available
- CO2 sensor measurement optimized for 5%CO2, measurement range up to 20%CO2
- 4-point traceable calibration (certificate included) for CO2
- Internal pressure and temperature measurement improve accuracy and stability
- Full temperature and pressure compensation available
- Sensor head heating for condensation prevention
Key Benefits:
Lower risk of cross contamination
The incubator can be sterilized with the GMP231 probe in place. There is no need to decontaminate the probe separately. In addition to reducing the risk of contamination, this also saves time.
Stable and accurate
The materials used in the GMP231 and also the internal pressure and temperature measurements all contribute to the excellent stability and accuracy of the sensor.
Data sheet on GMP231 (pdf, opens in a new tab)
GMP231 Order Form (pdf, opens in a new tab)
| Part No | Product Detail |
|---|---|
| GMP231A | 0…20% standard CO2 Probe Operating CO2 measurement 0…70°C, standby up to +195°C |
Spare Parts and Accessories for GMP231
DRW240977SP M12 Connection Cable 0.9m w/ open ends
ASM210903SP M12 Connection Cable 0.6m w/ Milli-Grid connector
DRW240015SP Silicon Plug
DRW240247SP Attachment Bracket
DRW240494SP PTFE filter
221040 USB PC Connection cable
221801 MI70 Connection cable
239523 Calibration adapter for GMP231
GMP251 Compact % Level CO2 Probe for demanding use
The Vaisala CARBOCAP® Carbon Dioxide Probe GMP251 is an intelligent, stand-alone, %-level probe for measuring CO2 in life science incubators, cold storage facilities, fruit and vegetable transportation, and in all demanding applications where stable and accurate percentage-level CO2 measurements are needed. The operating temperature range is -40 … +60 °C and the measurement range is 0 … 20%CO2.
The GMP251 is based on Vaisala’s unique, second-generation CARBOCAP® technology that enables exceptional stability. A new type of infrared (IR) light source is used instead of the traditional incandescent light bulb, which extends the lifetime of the GMP251. It has full temperature and pressure compensations of CO2 measurement – integrated temperature measurement for compensation purposes. The sensor head is heated to prevent condensation. Digital output over RS-485: Modbus & Vaisala Industrial Protocol. A calibration certificate is always included with the product
The GMP251 probe is part of the Indigo product family and can also be connected to the Indigo500 and Indigo200 series transmitters to extend its features, for example, for a display or relays.
The GMP251 can also be used with with the free Insight PC Software.
For spot-checking, the ideal choice is the Handheld CO2 Meter GM70.
The GMP251 replaces the following discontinued products: GMM221 and GMT221. Please note that spare parts and accessories for the GMP221 probe are still available and can be purchased in the Vaisala online store.
- Measurement range 0 … 20 %CO₂
- Intelligent, stand-alone probe with analog (V, mA) and digital (RS485) outputs
- Superior long-term stability with the 2nd-gen proprietary CARBOCAP® technology
- Wide operating temperature range -40 … +60 °C
- IP65 classified housing
- Full temperature and pressure compensations
- Integrated temperature measurement for CO₂ compensation purposes
- Compensations for background gases, O₂, and humidity
- Sensor head heated to prevent condensation
Key Benefits
The GMP251 is a all-in-one probe, which makes it easy and fast to install. The probe is resistant to dust and most chemicals, such as, H2O2 and alcohol-based cleaning agents. The probe’s surface is smooth, which makes it easy to clean.
With the wide operating temperature range, the GMP251 is suitable for a large number of applications. The probe provides accurate and stable measurements also in varying conditions.
Data sheet on GMP251 Carbon Dioxide Probe (pdf, opens in a new tab)
Insight PC Software For Easy Access to Indigo Compatible Probes (pdf, opens in a new tab)
| Part No | Product Detail |
|---|---|
| GMP251 | Carbon Dioxide Probe for % Level Measurements |
GMP251: Spare Parts & Accessories
GMP251: Spare Parts and Accessories
Spare Parts and Accessories:
ASM211650SP Standard Membrane Filter, Dia 24.8mm
DRW243649SP Porous Sintered PTFE filter, Dia 24.8mm
ASM211697SP Flow-through adapter with gas ports, Dia 24.8mm
223263SP Cable with open wires (1.5m)
244669SP Cable with open wires and 90° plug (0.6m)
216546SP Cable with open wires (10m)
CBL210347SP High temperature durable cable (special plug), M12 5pin
NOTE: Can only be ordered in multiples of 10, Only useable with mA output
243257SP Probe Mounting Clips (2 pcs)
243261SP Probe Mounting Flange
242659 USB cable for PC connection
CBL210472 MI70 connection cable for probe
DRW244827SP Calibration Adapter
GMW80 Series Carbon Dioxide and Temperature Transmitters for Demand-Controlled Ventilation
The Vaisala CARBOCAP® Carbon Dioxide and Temperature Series GMW80 transmitters are wall-mount transmitters designed to fulfill the needs for CO2 measurements in standard demand-controlled ventilation applications. The CO2 measurement is based on a second-generation CARBOCAP® sensor, which uses a novel, microglow light source instead of an incandescent light bulb for a longer trouble-free lifetime.
The internal reference in the CO2 sensor guarantees the best stability and operation also in constantly occupied buildings without frequent readjustments. The CARBOCAP® sensors give correct CO2 measurements immediately when powered on as they have a built-in reference measurement. Proper operation can be verified immediately after snapping on the device cover.
- Cost-efficient, affordable
- Reliable and maintenance-free operation for up to 15 years
- Superior stability due to 2nd generation proprietary CARBOCAP technology
- Improved accuracy due to low self-heating of microflow light source
- Easy to install, easy to use
- The internal reference in the CO2 sensor guarantees the best stability and operation even in buildings occupied 24/7
- Ideal for demand-controlled ventilation
Key Benefits
Easy to install
The installation of one unit takes less than 2 minutes. With modern buildings often having hundreds of sensors, the installation time per unit can be a significant cost factor. Returning to the building site to check sensor operation adds further costs.
The GMW80 series transmitters include a number of subtle design features that have been introduced to make installation and commissioning quick and easy. The pull-out tab makes opening the transmitter faster than before, while also doubling as a quality check slip and holder for the anti tamper screw. The back plate can be twisted onto pre-mounted screws, and the wiring can be done easily on the clearly marked back plate. The electronics can be snapped on later when the building automation system is commissioned.
Reliable Operation
The GMW80 series transmitters are optimized for low maintenance. The second-generation, low-power CARBOCAP® technology enables a longer lifetime and superior stability than ever before. As the power consumption is low, the heat generated by the electronics does not distort the temperature inside the sensor. The internal reference in the CO2 sensor guarantees the best stability and operation even in constantly occupied buildings without frequent readjustments. The reliable operation and accurate measurement values of the GMW80 series transmitters contribute to the significant cost savings brought by demand-controlled ventilation.
Data sheet on GMW80 Series (pdf, opens in a new tab)
| Part No | Product Detail |
|---|---|
| GMW86P | CO2+T transmitter, 0…2000ppm, Pt1000 |
| GMW86PT | CO2+T transmitter, 0…2000ppm, Pt1000, T set point 10KΩ |
| GMW83 | CO2+T transmitter, 0…2000ppm, 2 x 0…10V |
| GMW83T | CO2+T transmitter, 0…2000ppm, 2 x 0…10V, T set point 10KΩ |
| GMW83A | CO2+T transmitter, 0…2000ppm, 2 x 0…10V, CO2 LED:s |
| GMW83D | CO2+T transmitter, 0…2000ppm, 2 x 0…10V, Display |
| GMW83RP | CO2+RH+T transmitter, 0…2000ppm, 3 x 0..10V, Pt1000 |
| GMW83DRP | CO2+RH+T transmitter, 0…2000ppm, 3x 0..10V, Pt1000, Disp |
| GMW83RPC | CO2+RH+T transmitter, 0…2000ppm, 3x 0..10V, Pt1000 (1 pt calibration) |
| GMW83DRPC | CO2+RH+T transmitter, 0…2000ppm, 3x 0…10V, Pt1000 (Display, 1 pt calibration) |
| GMW84 | CO2+T transmitter, 0…2000ppm, 2 x 4…20mA |
| GMW84S | CO2+T transmitter, 0…2000ppm, 2 x 4…20mA |
GMW80 Spare Parts
GM10SP80 Replacement Digital CO2 module for GMW80 series
15778HM INTERCAP® Sensor
GMW90 CO2, Temperature and Humidity Transmitter Series for green building projects
The devices measure carbon dioxide and temperature and have an option for an additional humidity measurement. The instruments come with a calibration certificate that meets traceability and compliance requirements. Traceability is easily maintained with field-exchangeable intelligent measurement modules. The transmitter can be blended into the interior design of the space where it is installed using the optional decorative cover.
The recommended calibration interval is five years.
Features:
- Measured parameters: carbon dioxide, temperature, and humidity (optional)
- Superior long-term stability with the next generation Vaisala CARBOCAP sensor
- Accurate temperature and humidity measurements due to the low-power microglow infrared source
- Quick and easy installation and maintenance
- Calibrated, user-exchangeable measurement modules
- 3-point traceable CO2 calibration (certification included)
- Both analog and digital communication (BACnet/Modbus)
- Optional decorative cover blends the transmitter into your interior design
Key Benefits:
Easy installation
The GMW90 Series Transmitters have been designed for quick and easy installation. Every model includes a display for easy startup. To protect the sensor from dust and dirt during construction and installation, the units can be cabled with back-plate only. Electronics can be snapped on later at an appropriate phase in the construction project. This saves installation time in the project.
Convenient calibration
Regular instrument maintenance guarantees a long product lifetime although the transmitter’s inspection interval is five years. Calibration is easiest using the exchangeable measurement modules. Sensor traceability and measurement quality is easily maintained by snapping on a new module calibrated at Vaisala factory. The instrument can also be calibrated using a hand-held meter or reference gas CO2 bottle. The service interfaces are easy to reach by simply sliding the cover down. The closed cover keeps the measurement environment stable during calibration and ensures a top-quality final result.
GMW90 family includes the following models:
GMW93(D) CO2+T, voltage output (with display)
GMW93R(D) CO2+T+RH, voltage output (with display)
GMW93RA CO2+T+RH, voltage output with CO2 indicator LED and display
GMW94(D) CO2+T, current output (with display)
GMW94R(D) CO2+T+RH, current output (with display)
GMW95(D) CO2+T, digital model (with display)
GMW95R(D) CO2+T+RH, digital model (with display)
Data sheet on GMW90 (pdf, opens in a new tab)
| Part No | Product Detail |
|---|---|
| GMW90 | CO2+T transmitter, configurable |
| GMW90R | CO2+RH+T transmitter, configurable |
| GMW93 | CO2+T transmitter Voltage output |
| GMW93D | CO2+T transmitter, 0…10V output with display |
| GMW93R | CO2+RH+T transmitter, 0…10V output |
| GMW93RA | CO2+RH+T transmitter, 0…10V output with LED indicator |
| GMW93RD | CO2+RH+T transmitter, 0…10V output with display |
| GMW94 | CO2+T transmitter, 4…20mA output |
| GMW94D | CO2+T transmitter, 4…20mA output with display |
| GMW94R | CO2+RH+T transmitter, 4…20mA output |
| GMW94RD | CO2+RH+T transmitter, 4…20mA output with display |
| GMW95 | CO2+T transmitter, Modbus/BACnet |
| GMW95D | CO2+T transmitter, Modbus/BACnet with Display |
| GMW95R | CO2+RH+T transmitter, Modbus/BACnet |
| GMW95RD | CO2+RH+T transmitter, Modbus/BACnet with Display |
Spare Parts & Accessories for xMW90 Series
GMW90 Spare Parts and Accessories:
*Supplied with Calibration Certificate
GM10SP Replacement Digital CO2 module for GMW90 series
HTM10SP Digital Humidity and Temperature Module*
TM10SP Digital Temperature Module*
219980SP Connection cable for HM70 hand-held meter
219690 USB cable for PC connection
DRW237339SP Sliding cover HMW90 Spare Parts
DRW237354SP Sliding cover, blank HMW90 Spare Parts
GMD20 Series Carbon Dioxide Transmitters for Demand Controlled Ventilation
The duct-mounted Vaisala CARBOCAP® Carbon Dioxide Transmitter Series GMD20 are specially designed for demand-controlled ventilation (DCV). They are easy to install and require no maintenance. The GMD20 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 CO2 concentration is measured inside the duct without risks for leaks or wrong flow direction affecting the measurement. In addition, the measurement accuracy is not affected by dust, water vapor and most chemicals.
The GMD20 series transmitters can be used independently, or incorporated into building energy management systems. The series consists of duct mount units GMD20 and GMD20D. Version D has a display. The duct units’ compact sensor head design fits inside the ventilation duct, eliminating the risk of leaking gaskets and measurement errors.
The recommended calibration interval is five years.
Features:
- Leak insensitive in-duct measurement
- Incorporates the Vaisala CARBOCAP® sensor – the silicon based NDIR
- Excellent long-term stability
- Negligible temperature dependence
- Five year recommended calibration interval
- Warranty time 2 years
Specifications:
Measurement range: 0…2000 ppm (nominal, can be calibrated for other ranges)
Accuracy: ± 30 ppm + 2 % of reading
Operating temperature: -5…+45 °C
The GMW20 series transmitters can be used independently or they can be incorporated into building energy management systems.
The individual sensor types have a 3rd letter in the part no, e.g. GMD… (duct mount) or GMW… (wall mount)
The GMW20 series transmitters are wall mount, and available in two sizes (GMW21 and GMW22).
The GMD20 is a duct mountable transmitter.
Optional LonMark® approved interface modules are available for digital communication between the transmitters and a LonWorks network.
An analogue temperature option is available for the GMW21.
The GMA20T offers active temperature measurement using a semiconductor sensor IC.
The measurement module has a voltage output of 0…10 V, corresponding to a measurement range of 0…50 ºC.
The accuracy of the module is 0.5 ºC.
Nominal range of the CO2 sensors is 0..2000ppm.
They can be calibrated for other ranges: 0…5000ppm, 0…10,000ppm, 0…20,000ppm
Data sheet on GMD20 (pdf, opens in a new tab)
| Part No | Product Detail |
|---|---|
| GMD20 | 0-2000 ppm, duct mount transmitter with 0-20mA, 4-20mA or 0-10V outputs, diffusion aspirated for 0…2000ppm Supply voltage 18…30VDC. 24VAC. |
| GMD20D | Duct mount CO2 transmitter for 0…2000ppm, display & relay |
Options for GMx2x Series:
GMI 21 Display option and Relay output
GMR 20 Relay output
GML20 LonWorks option
19412GM Disk (with XIF file) for Installation of GMD/W20 with GML20
19748GM Disk (with XIF file) for Installation of GMD/W20 with GML20T
19222GM Calibration software kit for GMD/W20 series
( Disk + RS232 serial COM adapter )
19040GM Serial COM Adapter (Vaisala Model)
GM70 Handheld CO₂ Meter for spot-checking applications
The measurement accuracy is not affected by dust, water vapor or most chemicals. The meter can also be used in HVAC and industrial applications, and as a tool for checking Vaisala’s fixed CO2 instruments. Also the GMW90 can also be adjusted by using the GM70 meter.
The optional GM70 pump enables pump-aspirated sampling from difficult to access areas, such as incubators and chambers. Two sampling methods are available: the handle is for handheld diffusion sampling and the GM70 pump enables pump-aspirated sampling from locations difficult to access otherwise.
The handheld meter has two probe inputs; Vaisala’s relative humidity and dew point probes can also be used simultaneously with the CO2 measurement. The GM70 has a short warm-up time and is ready for use almost immediately. It has a menu-based interface, a graphical LCD display and data logging capability.
The optional MI70 Link Windows® software in combination with a USB connection cable is used to transfer logged data and real time measurement data from the GM70 to a PC.
Features:
- Two optional sampling methods: diffusion or pump aspiration
- Numerical and graphical display of measurements
- Data can be logged and transferred to PC via MI70 Link software
- Multi-probe operation; dew point and relative humidity probes can also be connected
- Suitable for field checking of fixed CO2 instruments
- Short warm-up time
- Wide selection of measurement ranges
Key Benefits:
User-friendly
The GM70 has a numerical and a graphical display for easy viewing of the data with a logging capability. The user interface is available in nine languages.
Wide measurement ranges
The GM70 allows you to choose the measuring range that best suits your application.
Easy sampling
The GM70 incorporates two sampling methods: the handle is for hand-held diffusion sampling and the pump enables pump-aspirated sampling from locations difficult to access by other means.
Data sheet on GM70 (pdf, opens in a new tab)
GM70 Order Form (pdf, opens in a new tab)
| Part No | Product Detail |
|---|---|
| MI70AUS | Indicator with backlit LCD display. Displays up to 3 parameters at a time either numerically or graphically. Includes data logging and can be used as a field calibrator for Vaisala transmitters. Complete with rechargeable battery and AC adapter |
| GMH70SUB | CO2 probe for MI70. CO2 measurement ranges of 0 .. 2 %, 0 .. 3 %, 0 .. 5%, 0 .. 10%, 0 .. 20 %, 0 .. 2000 ppm, 0 .. 3000 ppm, 0 .. 5000 ppm, 0 .. 7000 ppm, 0 .. 10000 ppm. Please specify range when ordering. |
| GM70PSUB | CO2 probe and pump for MI70. CO2 measurement ranges of 0 .. 2 %, 0 .. 3 %, 0 .. 5%, 0 .. 10%, 0 .. 20 %, 0 .. 2000 ppm, 0 .. 3000 ppm, 0 .. 5000 ppm, 0 .. 7000 ppm, 0 .. 10000 ppm. Please specify range when ordering. |
Spare Parts and Accessories for GM70
Accessories:AC-Adapters
MI70AUSADAPTER AC Adapter for use with MI70
26755 Rechargeable NiMH Battery Pack
Accessories:Connection Cables
27168ZZ MI70 Analogue output cable
GMA70 Connection cable for fixed CO2 instruments
219687 USB cable for Mi70 with Mi70Link Windows® software
MI70Link MI70 Windows software with RS232 cable
213107SP 10m extension cable for the MI70 probes
Accessories:Carrying cases
MI70CASE3 Waterproof carry case
Accessories: Others
GMP 221 Spare CO2 probe for GMT 221
GMP 222 Spare CO2 probe for GMT 222
25378GMSP Spare Filter + Cap for GMP221
25879GMSP Spare Filter + Cap for GMP222
GM70PUMP Pump unit for GM70
GMH70 Spare Handle for GM70
26150GM Field checking adapter for GMT220/GM70/GMM220
212807GM Moisture Exchanger (0.6m Nafion tubing)
GMM220 Series – GMM221 & GMM222
The Vaisala CARBOCAP® Carbon Dioxide Module Series GMM220 are designed for Original Equipment Manufacturers (OEM’s) requiring carbon dioxide measurements in harsh and demanding applications.
Features:
- Incorporates Vaisala CARBOCAP® – the silicon based CO2 sensor
- Choice of several measurement ranges
- IP65 protected probe against dust and spray water
- Interchangeable probes provide easy maintenance
- Modules optimized for integration into equipment for greenhouse control, incubators, fermentors, safety alarming and integrated systems.
Vaisala CARBOCAP®
The GMM220 series modules incorporate the industrial Vaisala CARBOCAP® Sensor. The patented sensor has unique reference measurement capabilities. Its critical parts are made of silicon; this gives the sensor outstanding stability over both time and temperature.
Since water vapor, dust, and most chemicals do not affect the measurement, the GMM220 series modules can be used in harsh and humid environments.
Interchangeable Probes
The GMP220 probes are interchangeable. They can be removed, reattached or replaced at any time – without the need for calibration and adjustment. The interchangeable probes make calibration and field service easy. In addition, the measurement range can be changed simply by replacing one probe with another.
Different Configurations
The user has a choice of measurement ranges up to 20 % CO2: the Vaisala CARBOCAP® Carbon Dioxide Module GMM221 for higher and the Vaisala CARBOCAP® Carbon Dioxide Module GMM222 for lower concentrations of CO2.
Different power supply voltages, output options, as well as cable lengths, connectors, and mounting gear are also available.
Data sheet on GMM220 (pdf, opens in a new tab)
Configuration code required
| Part No | Product Detail |
|---|---|
| GMM 221 | OEM module includes probe for %CO2 measurement. Available ranges: 0..2%, 0..3%, 0..5%, 0..10% and 0..20%. Please specify the range when ordering No probe cable supplied |
| GMM222 | OEM module includes probe for ppm CO2 measurement. Available ranges: 0..2000/3000/5000/7000 & 10000 ppm. Please specify the range when ordering No probe cable supplied |
Cables, Options, Spare Parts for GMM220 Series - GMM221 & GMM222
Spare Parts:
GMP 221 Spare CO2 probe for GMM 221
GMP 222 Spare CO2 probe for GMM 222
GMM220Z100SP 1m High T (150°C) Probe cable for GMM221/222
GMP343Z200SP 2m Probe Cable for GMM221/222
GMP343Z600SP 6 m Probe Cable for GMM221/222
GMP343Z1000SP 10 m probe Cable for GMM221/222
25245GMSP Probe mounting clips (2 pieces), Spare Part
GM45156SP Probe mounting flange, Spare Part
GMM220BOARD Spare Module Board GMM221/GMM222
GMM110 Series: Transmitter and Module Series
GMM111 OEM Carbon Dioxide Module for HVAC Applications
The Vaisala CARBOCAP® Carbon Dioxide Module GMM111 is designed especially for control of biological processes where high CO2 concentrations are used. It has 3 optional measurement ranges 0 … 5/10/20 % CO2. The GMM111 is a flow-through model and has barbed connectors for attaching the in and out flow tubes. As the module is not mounted in the chamber, the chamber can be heatsterilized without removing the module.
The Vaisala CARBOCAP® CO2 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 filter measures CO2 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.
The true internal reference measurement of Vaisala CARBOCAP® CO2 transmitters provides years of stable CO2 measurements.
Features:
- Compact CO2 module with flow-through aspiration
- Ideal for control of CO2 concentrations in incubators
- Incorporates Vaisala CARBOCAP®, the silicon based NDIR sensor with unique internal referencing
- Advanced single-beam, dual wavelength measurement with no moving parts
- Measurement range options 0 … 5 %, 0 … 10 % and 0 … 20 % CO2
- Excellent long-term stability
Data sheet on GMM111 (pdf, opens in a new tab)
| Part No | Product Detail |
|---|---|
| GMM111 | 0-2000 ppm, OEM transmitter with 4-20mA or 0-10V outputs, diffusion aspirated. Supply voltage 24VAC/VDC. |
GMM112 OEM Carbon Dioxide Module for HVAC Applications
The Vaisala CARBOCAP® Carbon Dioxide Module GMM112 is a compact module for measuring ppm (parts per million) levels of carbon dioxide.
The GMM112 module is designed for indoor use in demand controlled ventilation and other applications requiring carbon dioxide control.
The GMM112 has three optional ranges to select from: 0…2 000 ppm, 0…5 000 ppm and 0…10 000 ppm. The selectable analog (current and voltage) and digital outputs make it easy to integrate to various control systems. The GMM112 modules are easy to install and need practically no maintenance.
Proven Performance with the Vaisala CARBOCAP® Sensor
The GMM112 module includes Vaisala CARBOCAP® carbon dioxide sensor, a silicon-based infrared (IR) absorption sensor. The excellent long-term stability of the CARBOCAP® sensor results from its unique measurement technology. The sensor features an electrically tunable Fabry-Perot Interferometer for built-in reference measurement. The sensor not only measures CO2 absorption but also a reference, which makes it possible to compensate for potential
light intensity variations and contamination and dirt accumulation in the optical path, making the sensor extremely stable over time.
CARBOCAP sensor has no need for any compensation algorithms that are used in more simple sensors to compensate for their drift. In applications with constant elevated levels of carbon dioxide and in buildings with around-the- clock occupancy (e.g. hospitals, manufacturing facilities, residential buildings, and retirement homes) the compensations based on assumed background carbon dioxide level simply do not work.
Features:
- Compact OEM module for demand controlled ventilation and other CO2 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
Data sheet on GMM112 OEM Carbon Dioxide Module for HVAC Applications (pdf, opens in a new tab)
| Part No | Product Detail |
|---|---|
| GMM112 | CO2 Module GMM112 |
Obsolete and Superseded Products
GMW21(D) wall-mount transmitter (with display) now superseded by GMW80 above
GMW115 Carbon Dioxide Transmitter for Demand Controlled Ventilation
GMW116 Carbon Dioxide and Temperature Transmitter