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www.vaisala.com GMP343 Carbon Dioxide Probe for Demanding Measurements Features/Benefits Excellent accuracy and stability ▪ ▪ ▪ ▪ ▪ ▪ ▪ Vaisala CARBOCAP® Sensor, a silicon-based non-dispersive infrared (NDIR) sensor A single-beam, dualwavelength CO 2 measurement with no moving parts Compensation options for temperature, pressure, humidity and oxygen Low power consumption and heat emission Designed for outdoor use Compact and lightweight The GMP343 is available as an open-path diffusion-aspirated model (left) and as a flow-through model (right). The Vaisala CARBOCAP ® Carbon Dioxide Probe GMP343 is an accurate and rugged probe-type instrument for ecological measurements. Typical applications include CO 2 soil respiration, ambient CO 2 monitoring, plant growth chambers, and OEM applications. The GMP343 can output both numerically filtered and raw measurement data and it can also compensate the measurement with an internal temperature measurement and user-set relative humidity, pressure and oxygen values. In combination with an MI70 indicator, the GMP343 provides a tool for accurate in-situ measurement. The MI70 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 recalibrate the instrument using the multipoint calibration (MPC) feature allowing up to 8 user-defined calibration points. Technical Data Performance Measurement range options 0 ... 1000 ppm, 0 ... 2000 ppm, 0 ... 3000 ppm, 0 ... 4000 ppm, 0 ... 5000 ppm, 0 ... 2 % Accuracy (excluding noise) at 25 °C (77 °F) and 1013 hPa after factory calibration with 0.5 % accurate gases with different range options 0 ... 1000 ppm ±(3 ppm + 1 % of reading) 0 ... 2000 ppm - 0 ... 2 %* ±(5 ppm + 2 % of reading) *Accuracy below 200 ppm CO 2 not specified for 2 % range option Noise (repeatability) at 370 ppm CO 2 with no output averaging ±3 ppm CO 2 with 30 s output averaging ±1 ppm CO 2 Temperature Effect on accuracy with temperature compensation: CO 2 range options 0 ... 1000 ppm 0 ... 2 000 - 5000 ppm 0 ... 2 % Temperature °C (°F) Accuracy (% of reading) +10 ... +40 (+50 ... +104) ±1 ±1 ±2 +40 ... +60 (+104 ... +140) ±2 ±3 ±4 -40 ... +10 (-40 ... +50) ±3 ±3 ±5 For readings below 200 ppm CO 2 ±5 ppm CO 2 Temperature compensation is performed by an integrated Pt1000 element 120
Technical Data Pressure Effect on accuracy with pressure compensation: CO 2 range options 0 ... 1000 ppm 0 ... 2000 - 2 % Pressure (hPa) Accuracy (% of reading) 900 ... 1050 ±0.5 ±1 700 ... 1300 ±1 ±2 Integrated pressure sensor is not included in GMP343 Long term stability see graph below easy
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