CO₂ Meter & 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

The Vaisala RFL100 uses secure, long-range VaiNet wireless technology to monitor temperature, relative humidity and carbon dioxide with the AP10 Access Point and viewLinc Continuous Monitoring System.

• At least 50 m typical indoor wireless range
• Up to 32 RFL100 data loggers per AP10
• 30 days of local measurement memory
• Approximately 18 months of battery operation for temperature and humidity monitoring

The Vaisala GMP343 is a rugged, high-accuracy carbon-dioxide probe for outdoor monitoring, ecological research, soil respiration, plant-growth chambers and demanding OEM applications.

• Selectable CO₂ ranges from 0–1000 ppm to 0–2%
• Diffusion-aspirated or flow-through sampling models
• Accuracy up to ±(3 ppm + 1% of reading)
• Temperature, pressure, humidity and oxygen compensation
• RS-232, RS-485, 4–20 mA, 0–2.5 V or 0–5 V outputs
• Raw and numerically filtered measurement data
• IP67 probe housing with the cable connected
• Compatible with MI70 for portable display and logging

The Vaisala GMW80 Series provides dependable, cost-efficient room measurement for demand-controlled ventilation and indoor air-quality applications.

• CO₂ measurement ranges up to 2000 or 5000 ppm, depending on model
• Temperature measurement from 0 to +50 °C on selected models
• Optional relative-humidity measurement from 0 to 95 %RH
• Voltage, current, relay, Pt1000 and Modbus RTU options
• Display or colour CO₂ indicator available on selected models
• Stable Vaisala CARBOCAP® technology for continuously occupied buildings
• Quick installation with correct CO₂ readings immediately after start-up

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 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
• GMD20 without display and GMD20D with local display
• 0–20 mA, 4–20 mA and 0–10 V analogue outputs
• Optional relay or LonWorks® interface on applicable configurations
• IP65 electronics enclosure for duct installations
• Use Vaisala GMD110 for new installations

The Vaisala MGP262 continuously measures methane slip and carbon dioxide in offgas from biomethane-upgrading processes. Its in-situ design provides direct, always-on measurement without a separate sampling system.

• Optimised for low-level methane measurement in CO₂-rich offgas
• CH₄ measurement range from 0–5 vol-%
• CO₂ measurement range from 0–100 vol-%
• Heated optical measurement for demanding and humid process conditions
• Three isolated 4–20 mA outputs and RS-485 Modbus RTU
• Ex-certified construction for direct installation in hazardous process areas

Ask Seacom about the MGP262

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 GMP231 is an OEM carbon-dioxide probe designed for accurate measurement and permanent wall installation in life-science incubators.

• CO₂ measurement range from 0 to 20%
• Measurement performance optimized around 5% CO₂
• Sensor head withstands heat sterilisation at +180 °C
• At least 120 specified +180 °C sterilisation cycles
• Internal temperature and pressure measurement for compensation
• Heated sensor head helps prevent condensation
• I²C, Vaisala RS-485 protocol and scalable 0–20 mA options
• Four-point traceable CO₂ calibration certificate included

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
• Measurement up to 30,000 ppm with reduced accuracy
• Accuracy of ±40 ppm from 0 to 3000 ppm
• 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

The Vaisala GMP251 is an intelligent probe for stable percentage-level carbon-dioxide measurement in incubators, controlled-atmosphere storage and demanding industrial applications.

• CO₂ measurement range from 0 to 20% CO₂
• Accuracy of ±0.1% CO₂ at 5% CO₂
• 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
• IP65 probe body with traceable calibration certificate

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 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