Gases Detection

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 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 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 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 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