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GMD110 catalogue
Duct Mounted CO2 Transmitter GMD10
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Vaisala GMD110 High-Accuracy Duct CO₂ Transmitter
The Vaisala GMD110 measures carbon dioxide directly inside ventilation ducts for precise HVAC control and demand-controlled ventilation.
- CO₂ measurement range from 0 to 10,000 ppm
- Accuracy of ±40 ppm from 0 to 3000 ppm
- 4–20 mA, 0–5 V, 0–10 V or Modbus RTU output options
- Analogue scaling of 0–2000, 0–5000 or 0–10,000 ppm
- Fast response with less than two minutes to full specification
- Heated CARBOCAP® sensor head helps prevent condensation
- IP65 enclosure for demanding duct installations
- Traceable calibration certificate included
Reliable CO₂ Measurement Inside Ventilation Ducts
The Vaisala GMD110 is a duct-mounted carbon-dioxide transmitter for air-handling systems and demand-controlled ventilation. Its sensing head measures directly inside the duct, avoiding external sampling tubes and reducing the risk of errors caused by leaks or incorrect sample-flow direction.
Vaisala CARBOCAP® technology provides stable CO₂ measurement in demanding HVAC environments. The sensor head is heated during operation to reduce condensation risk, while the IP65 enclosure protects the electronics from dust and water jets.
Choose the GMD110 Output and Range
| Requirement | Order selection | Important check |
|---|---|---|
| 4–20 mA | Current-output version | Requires 20 to 30 V DC; maximum loop load is 500 Ω |
| 0–5 V | Voltage-output version with 0–5 V selection | Requires 12 to 30 V DC; receiving input must have at least 10 kΩ load resistance |
| 0–10 V | Voltage-output version with 0–10 V selection | Confirm the building controller input and common grounding arrangement |
| Modbus RTU | RS-485 version | Confirm network wiring, baud rate, parity, device address, termination and biasing |
| Normal occupied-space HVAC | 0–2000 ppm analogue scale | Use when the expected duct concentration remains within the standard ventilation range |
| Elevated CO₂ | 0–5000 ppm analogue scale | Provides more headroom while retaining useful analogue resolution |
| Full measurement range | 0–10,000 ppm analogue scale | Use only when the process can approach higher concentrations |
Scaling matters: Every GMD110 measures from 0 to 10,000 ppm, but an analogue unit is ordered with a defined output scale. Match that scale to the controller configuration and expected CO₂ concentration.
CO₂ Measurement Performance
| Specification | GMD110 |
|---|---|
| Measurement range | 0 to 10,000 ppm CO₂ |
| Accuracy from 0 to 3000 ppm | ±40 ppm CO₂ |
| Accuracy from 3000 to 10,000 ppm | ±2% of reading |
| Typical calibration uncertainty at 2000 ppm | ±31 ppm CO₂ |
| Typical calibration uncertainty at 10,000 ppm | ±105 ppm CO₂ |
| Start-up time at +25 °C | Less than 12 seconds |
| Warm-up time for full specification | Less than two minutes |
| Response time | Less than one minute, T90 |
| Sensor technology | Vaisala CARBOCAP® non-dispersive infrared sensor |
| Calibration supplied | Traceable calibration certificate |
The stated accuracy applies at +25 °C and 1013 hPa and includes repeatability and non-linearity. Temperature and pressure influence should be considered when the duct conditions differ substantially from the reference conditions.
Electrical and Mechanical Specifications
| Specification | GMD110 |
|---|---|
| Output parameter | Carbon dioxide in ppm |
| Current output | 0 or 4 to 20 mA, scalable; maximum load 500 Ω |
| Voltage output | 0 to 5 V or 0 to 10 V, scalable; minimum load 10 kΩ |
| Digital output | RS-485 with Modbus RTU |
| Supply for current output | 20 to 30 V DC |
| Supply for voltage output or RS-485 | 12 to 30 V DC |
| Power consumption | 0.5 W typical; 1.1 W maximum |
| Operating temperature | −20 to +60 °C |
| Operating humidity | 0 to 95 %RH, non-condensing |
| Enclosure rating | IP65 |
| Probe dimensions | 25 mm diameter and 126 mm length |
| Weight | Approximately 215 g |
| Mounting | Screws or optional 243261SP mounting flange |
| Terminal wire size | 0.5 to 2.5 mm² / AWG 24 to 14 |
Where the GMD110 Fits
| Application | How the measurement is used | Selection consideration |
|---|---|---|
| Demand-controlled ventilation | Controls outdoor-air delivery according to duct CO₂ concentration | Choose an output and range matching the building controller |
| Return-air monitoring | Provides a combined indication of CO₂ returning from occupied zones | Confirm that the return-air location represents the intended area |
| Air-handling units | Supplies CO₂ data for ventilation control, alarms and trending | Modbus can reduce analogue wiring where the controller supports RS-485 |
| Commercial buildings | Supports indoor-air-quality and energy-efficiency strategies | Use room transmitters when zone-level measurement is required |
| Hospitals and critical facilities | Provides traceable duct CO₂ measurement for demanding HVAC systems | Define calibration and verification intervals in the maintenance plan |
GMD110 Configuration and Service Tools
| Tool | Connection | Use |
|---|---|---|
| Vaisala Insight PC software | USB2 adapter with M12-to-M8 service cable 262195SP | Configuration, diagnostics and CO₂ adjustment |
| Vaisala Indigo80 | M12-to-M8 cable 262195SP | Portable display, configuration and field adjustment |
| Vaisala MI70 | MI70 connection cable 219980SP | Portable display and supported service functions |
| Calibration adapter | DRW244827SP | Controlled reference-gas delivery during calibration work |
The service port is intended for temporary configuration and servicing connections, not permanent system communication. Return the output-mode switch to the required operating position after service work.
GMD110 and GMD20 Comparison
| Selection point | GMD110 | GMD20 Series |
|---|---|---|
| Project use | Preferred Vaisala duct CO₂ transmitter for new installations | Discontinued legacy transmitter |
| CO₂ range | 0 to 10,000 ppm measurement range | Nominally 0 to 2000 ppm; other ranges required recalibration |
| Accuracy | ±40 ppm from 0 to 3000 ppm | ±(2% of range + 2% of reading) |
| Outputs | 4–20 mA, 0–5 V, 0–10 V or Modbus RTU | 0–20 mA, 4–20 mA and 0–10 V; optional relay or LonWorks |
| Supply | 12 to 30 V DC or 20 to 30 V DC, depending on output | Nominal 24 V AC/DC |
| Operating temperature | −20 to +60 °C | −5 to +45 °C |
| Calibration | Traceable calibration certificate supplied; Insight, Indigo80 and MI70 service support | Legacy field-check and calibration arrangement |
| Product information | This page details GMD110 | Review legacy Vaisala GMD20 |
Replacing a GMD20? Check the old supply, signal, scaling, display or relay requirement and duct mounting before ordering. GMD110 is the suitable starting point, but it is not a blind terminal-for-terminal replacement.
Compare Other Vaisala CO₂ Products
| Product | Installation | Choose it when |
|---|---|---|
| GMD110 | Ventilation duct | You need direct, high-accuracy duct CO₂ measurement with analogue or Modbus output |
| GMW80 Series | Occupied-room wall | You need a cost-effective room transmitter with model-specific temperature, humidity and output choices |
| GMW90 Series | Occupied-room wall | You need higher-performance room CO₂, temperature and optional humidity measurement |
| GMP252 | Machine, chamber, process or custom assembly | You need a standalone ppm-level probe for demanding conditions rather than a dedicated duct enclosure |
| GMP251 | Incubator, chamber or percentage-level process | You need percentage-level CO₂ measurement |
| Product information | Explore Vaisala GMW80 Explore Vaisala GMW90 Explore Vaisala GMP252 Explore Vaisala GMP251 | |
Vaisala GMD110 Supplier and Technical Support in Malaysia
Seacom Process Instruments supplies and supports the Vaisala GMD110 Duct CO₂ Transmitter in Malaysia for air-handling units, ventilation ducts, commercial buildings, hospitals, data centres and other demanding HVAC applications.
Our team can help select the 4–20 mA, 0–5 V, 0–10 V or Modbus RTU version, confirm the required CO₂ scaling, review the duct location and specify suitable mounting, configuration and service accessories. We can also assist with GMD20 replacement planning, commissioning and calibration.
Selecting or replacing a duct CO₂ transmitter? Send us the expected CO₂ range, duct size, air velocity, operating temperature, supply voltage, controller input, communication protocol and details of any existing instrument.
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The Vaisala GMW90 Series provides stable wall-mounted carbon-dioxide and temperature measurement, with optional humidity, for demanding HVAC and building-automation applications.
- Carbon-dioxide measurement from 0 to 5000 ppm
- CO₂ accuracy up to ±(30 ppm + 2% of reading)
- Temperature measurement from −5 to +55 °C
- Optional HUMICAP® relative-humidity measurement from 0 to 95 %RH
- Voltage, current or Modbus RTU output models
- Display and CO₂ status-indicator options
- Field-exchangeable calibrated measurement modules
- Traceable three-point CO₂ calibration certificate included
The Vaisala HMW90 Series provides high-accuracy humidity and temperature measurement for demanding indoor HVAC and controlled-environment applications.
- Humidity accuracy up to ±1.7% RH
- Analog or Modbus RTU output models
- Optional display and configurable relay
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15 other products in the same category:
The Vaisala MGP261 measures methane, carbon dioxide and humidity directly in raw biogas. Its in-situ design avoids a separate sampling system and helps operators monitor gas quality while protecting downstream equipment.
- Measures CH4, CO2 and water vapour in one probe
- 0–100 vol-% measurement range for methane and carbon dioxide
- Humidity output as 0–25 vol-% H2O or −10 to +60 °C dew point
- Heated optics help prevent condensation in wet biogas
- Three isolated 4–20 mA outputs and RS-485 Modbus RTU
- Ex-certified construction for direct installation in hazardous process areas
The Vaisala GMW90 Series provides stable wall-mounted carbon-dioxide and temperature measurement, with optional humidity, for demanding HVAC and building-automation applications.
- Carbon-dioxide measurement from 0 to 5000 ppm
- CO₂ accuracy up to ±(30 ppm + 2% of reading)
- Temperature measurement from −5 to +55 °C
- Optional HUMICAP® relative-humidity measurement from 0 to 95 %RH
- Voltage, current or Modbus RTU output models
- Display and CO₂ status-indicator options
- Field-exchangeable calibrated measurement modules
- Traceable three-point CO₂ calibration certificate included
The Vaisala Indigo500 Series provides flagship industrial measurement integration: choose Indigo510 for a simplified single-probe system or Indigo520 for full dual-probe capability.
- Indigo510: one probe and two isolated analog outputs
- Indigo520: two probes, four isolated outputs and two relays
- Ethernet web interface and Modbus TCP communication
- Rugged IP66 and NEMA 4 metal enclosure
The Vaisala Indigo200 Series is the standard transmitter platform for one interchangeable Indigo-compatible smart probe, providing local display and practical automation-system connectivity.
- Indigo201 with three analog outputs and two relays
- Indigo202 with Modbus RTU and two relays
- Colour display with numerical and graphical views
- IP65 enclosure for industrial measurement applications
The Vaisala GM70 was a portable carbon-dioxide meter for diffusion measurements, pump sampling, data logging and field checking fixed CO₂ instruments.
- Discontinued product; not recommended for new purchases
- GMP221 probes for percentage-level CO₂ up to 20%
- GMP222 probes for ppm-level CO₂ up to 10,000 ppm
- GMH70 diffusion handle or GM70PUMP sampling system
- MI70 indicator with numerical, graphical and logging functions
- Used for field checking compatible fixed Vaisala CO₂ instruments
- Use Vaisala Indigo80 for new portable measurement systems
The Vaisala GMP252 is an intelligent standalone probe for stable ppm-level carbon-dioxide measurement in demanding HVAC, refrigeration, agriculture and industrial applications.
- CO₂ measurement range from 0 to 10,000 ppm
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- Compensation for temperature, pressure, humidity and oxygen
- Heated sensor head helps prevent condensation
- 0–20 mA, 4–20 mA, 0–5 V, 0–10 V and RS-485 output options
- Standalone Modbus RTU operation or connection to an Indigo transmitter
- Compatible with Vaisala Indigo80 and Insight PC software
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- At least 120 specified +180 °C sterilisation cycles
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The Vaisala GMD20 Series was designed for carbon-dioxide measurement inside ventilation ducts and demand-controlled ventilation systems.
- Discontinued legacy product; not recommended for new projects
- Nominal CO₂ measurement range from 0 to 2000 ppm
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- Optional relay or LonWorks® interface on applicable configurations
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- Use Vaisala GMD110 for new installations
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The Vaisala GMW80 Series provides dependable, cost-efficient room measurement for demand-controlled ventilation and indoor air-quality applications.
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