Vaisala GMP343 CO₂ Probe


  • Low power consumption and heat emission.
  • Compact and lightweight
  • Excellent accuracy and stability
  • Vaisala CARBOCAP sensor, a silicon-based non-dispersive infrared (NDIR) sensor
  • Single-beam, dual-wavelength – CO2 measurement with no moving parts
  • Compensation options for temperature, pressure, humidity, and oxygen
  • Designed for outdoor use

Dpstar is a leading supplier of environmental measurement sensors for temperature, relative humidity, pressure, dew point, CO2, and other environmental condition monitoring for industrial process application and research. Since the ’90s, we earned a reputation as a trusted partner to our clients through our commitment and dedication. We are an authorized distributor and supplier of measuring sensors solutions from renowned manufacturers Vaisala. Vaisala is a global leader in environmental and industrial measurement. Building on 80 years of experience, Vaisala provides observations for a better world. Vaisala is a reliable partner for customers around the world, offering a comprehensive range of innovative observation and measurement products and services.

The Vaisala CARBOCAP Carbon Dioxide Probe GMP343 is an accurate and rugged probe-type instrument 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 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.


Key Benefits

Low Operating Costs

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.

Stable & Reliable

The GMP343 has good stability both in terms of time, and temperature and also in a good stability flow.


Vaisala GMP343 CO₂ Probe_DpstarGroup