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Vaisala CARBOCAP Carbon Dioxide Probe

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GMP343 Carbon Dioxide Probe rugged instrument for ecological measurements

Diffusion based design - no sampling systems needed. A flow-through model is also available. Vaisala CARBOCAP Carbon Dioxide Probe GMP343 Excellent accuracy and stability For harsh environments Diffusion and flow-through models Wide operating temperature and humidity ranges Compensation options for temperature, pressure, humidity and oxygen Low power consumption and heat emission Short warm-up time Compact and light

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Product Description

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
OEM applications

Open path, diffusion aspirated probe
The product concept eliminates the need for bulky and power-consuming gas sampling systems. The power consumption of the GMP343 itself is low, even below 1 W.

Novel solution for soil respiration measurements
The use of diffusion aspiration eliminates the measurement error caused by pressure differences often present in pump-aspirated measurement systems.

Rugged metal structure
The body of the GMP343 is IP67-classified and suitable for harsh environments. The sensor’s membrane filter protects it from dust and dirt. Heated optics prevent the formation of condensation.

User-configurable measurement
The GMP343 can output both numerically filtered and raw measurement data. The instrument can also compensate the measurement with an internal temperature measurement and user-set relative humidity, pressure and oxygen values.

Performance
Measurement range options 0...1000 ppm, 0...2000 ppm,
0...3000 ppm, 0...4000 ppm,
0...5000 ppm (reduced accuracy >4000 ppm)
Accuracy after factory calibration with 0.5 % accurate gases
+/- 2.5 % of reading
at the CO2 calibration points +/- 1.5 % of reading
below 300 ppmCO2 +/- 5 ppmCO2

Short-term stability (up to 6 hours) at 350 ppmCO2 ±1 ppmCO2

Long-term stability
easy < +/-2% of reading / year
moderate < +/-2% of reading / 6 months
harsh < +/-2% of reading / 3 months

Inputs and outputs
Operating voltage 10…36 VDC
Power consumption without heating < 1 W with heating max. 3.5 W

Analog outputs
Current output range 4...20 mA resolution 14 bits
max. load 800 ohm @ 24 VDC, 150 ohm @ 10 VDC
Voltage output range 0...2.5 V, 0...5 V
resolution 14 bits (13 bits with 0...2.5 V)
min. load 5 kohm

Digital outputs RS485, RS232