Vaisala GMP343 Technical data

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GMP343 Carbon Dioxide Probe for Demanding Measurements

Features/Beneﬁts

Excellent accuracy and stability

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Vaisala CARBOCAP® Sensor,

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a silicon-based non-dispersive infrared (NDIR) sensor

A single-beam, dual-

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wavelength CO with no moving parts

Compensation options

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for temperature, pressure, humidity and oxygen

Low power consumption and

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heat emission

Designed for outdoor use

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Compact and lightweight

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measurement

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 CO

monitoring, plant growth chambers, and

OEM applications.

The GMP343 can output both numerically ltered 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-dened calibration points.

soil respiration, ambient

Technical data

Performance

Measurement range options 0 ... 1000 ppm, 0 ... 2000 ppm,

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

Noise (repeatability) at 370 ppm CO

with no output averaging ±3 ppm CO with 30 s output averaging ±1 ppm CO

TEMPERATURE

Effect on accuracy with temperature compensation:

range options 0 ... 1000 ppm 0 ... 2 000 - 5000 ppm

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 Temperature compensation is performed by an integrated Pt1000 element

0 ... 3000 ppm, 0 ... 4000 ppm,

0 ... 5000 ppm, 0 ... 2 %

not speciﬁed for 2 % range option

0 ... 2 %

±5 ppm CO

Technical data

PRESSURE

Effect on accuracy with pressure compensation:

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 <±2 % of reading / year moderate <±2 % of reading / 6 months harsh <±2 % of reading / 3 months

GMP343 OPERATING CONDITIONS

Response time (90 %)

DIFFUSION MODEL

Filter attached Averaging (s) Response (s)

Ye s 0 75 Ye s 30 82 No 0 <2 No 30 30

FLOW-THROUGH MODEL

Gas ﬂow (l/min) Averaging (s) Response (s)

0.3 0 26

0.3 30 44

1.2 0 8

1.2 30 23

Warm-up time

full accuracy ±0.5 % 10 min full accuracy 30 min

Operating Environment

Temperature

operating -40 ... +60 °C (-40 ... +140 °F)

storage -40 ... +70 °C (-40 ... 158 °F) Humidity see graph ‘GMP343 Operating Conditions’ Pressure

compensated range 700 ... 1300 hPa

operating <5 bar Gas ﬂow for ﬂow-through model 0 ... 10 liters/min Electromagnetic compatibility EN61326, Generic

Environment

Inputs and outputs

Operating voltage 11 ... 36 VDC Power consumption

without optics heating <1 W with optics heating <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

Materials

Housing anodized aluminium Filter cover PC IP classiﬁcation <1 W

Housing (cable attached) IP67 Diffusion ﬁlter (weather protection) IP65

Diffusion ﬁlter (sintered PTFE) IP66 Cable connector type 8-pin M12 Weight (probe only) 360 g

Options and accessories

Wall mount bracket GMP343BRACKET Mounting ﬂange GMP343FLANGE Standard diffusion ﬁlter (weather protection, IP65) +ﬁlter cover GMP343FILTER Diffusion ﬁlter (sintered PTFE ﬁlter, IP66) + ﬁlter cover 215521 Calibration adapter (for the diffusion model) GMP343ADAPTER Junction box JUNCTIONBOX-8 Probe cables

2m GMP343Z200SP

6m GMP343Z600SP

10m GMP343Z1000SP PC connection cable, 2m 213379 MI70 connection cable, 2m DRW216050SP USB adapter (USB-D9 Serial connection cable) 219686 Soil adapter kit for horizontal positioning 215519 Soil adapter kit for vertical positioning 215520

For more information, visit www.vaisala.com or contact us at sales@vaisala.com

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