CO2 Probe

CO2 Probe

GMP343 delivers precise and stable CO₂ measurements in demanding field and laboratory applications. With built-in compensation for environmental factors and flexible integration options, it is an excellent choice for flux chambers, ecosystem monitoring, and climate research.

Contact for more information

WhatsAPP | +358 40 5022740 | sense@datasense.fi

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Description

Vaisala GMP343 – Carbon Dioxide Probe for Demanding Measurements

The Vaisala GMP343 is a high-precision CO₂ probe designed for scientific and environmental research.
Based on the CARBOCAP® NDIR sensor, it provides accurate and stable CO₂ measurements for ecological studies, soil respiration, chamber flux research, and ambient CO₂ monitoring.
The rugged, lightweight design and wide operating range make it ideal for both laboratory and field use under varying environmental conditions.

Key Benefits and Applications

  • Accurate and stable CO₂ measurement using Vaisala CARBOCAP® infrared technology

  • Single-beam, dual-wavelength NDIR sensor with no moving parts

  • Temperature, pressure, humidity, and oxygen compensation for superior accuracy

  • Available as diffusion or flow-through model for soil and chamber applications

  • Low power consumption – suitable for long-term remote operation

  • Compatible with FluxScout chamber systems, Sense Gas, and MI70 indicator for data display and logging

  • Recalibration option via multipoint calibration (MPC) with up to 8 user-defined points

Technical Specifications

Feature Values
Measurement principle Non-dispersive infrared (NDIR), Vaisala CARBOCAP®
Measurement range options 0–1000 ppm, 0–2000 ppm, 0–3000 ppm, 0–4000 ppm, 0–5000 ppm, 0–2 %
Accuracy (25 °C, 1013 hPa) ±(3 ppm + 1 % of reading) for 0–1000 ppm; ±(5 ppm + 2 %) for higher ranges
Noise (repeatability) ±3 ppm (no averaging); ±1 ppm (30 s averaging)
Long-term stability ±2 % of reading per year (typical)
Response time (90 %) 4–75 s depending on model and averaging
Operating temperature −40 … +60 °C
Storage temperature −40 … +70 °C
Compensated pressure range 700 … 1300 hPa
Operating pressure < 5 bar
Gas flow (flow-through model) 0 … 10 L/min
Power supply 11 … 36 V DC
Power consumption < 1 W (typical), < 3.5 W with optics heating
Digital outputs RS-485, RS-232
Analog outputs 0 … 2.5 V / 0 … 5 V or 4 … 20 mA
Housing Anodized aluminum
Protection class IP67 (housing), IP65–IP66 (diffusion filters)
Dimensions Diffusion model: Ø 55 mm × 194 mm; Flow-through model: Ø 45 mm × 188 mm
Weight 360 g
Origin Vaisala Oyj, Finland
Warranty 12 months

Accessories

Mounting flange, wall bracket, diffusion filters (IP65/IP66), soil adapters, calibration adapter, and MI70 interface cables available.

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