Fast Greenhouse Gas Analyzer (CH4, CO2, H2O)

• Measurements reported over wide range of mixing ratios
• New Enhanced Performance series provides ultra-high stability
• Methane, carbon dioxide and water vapor measured simultaneously
• Measurements of all three gases reported at up to 10 Hz
• High-resolution absorption spectra viewable and accessible always
• Requires only 100 watts (standard models with internal pump)
• Methane and carbon dioxide reported on dry basis without sample drying

LGR’s new “Enhanced Performance' series incorporates proprietary internal thermal control for ultra-stable measurements with unsurpassed precision, accuracy and drift. Moreover, only LGR’s analyzers provide reliable measurements (with guaranteed specs) at concentrations more than 20 times greater than typical ambient levels (to 1000 ppmv methane in air, to 20,000 ppmv carbon dioxide in air). The Analyzer uses LGR’s patented Off-axis ICOS technology, a fourth-generation cavity enhanced absorption technique. Off-axis ICOS has many advantages over conventional optical techniques such as being alignment insensitive, having a much shorter measurement time, and not requiring expensive and power consuming auxiliary components.

The Analyzer has an internal computer that can store data practically indefinitely on its hard disk drive and send real time data to a data logger via the digital (RS232), analog or Ethernet outputs. As with all LGR analyzers, the GGA may be controlled remotely via the Internet. This capability allows the user to operate the analyzer using a web browser practically anywhere Internet access is available. Furthermore, remote access allows bios-level control of the instrument and provides the opportunity to obtain data and to diagnose the instrument operation without being on site.

• CH4, CO2, H2O measured simultaneously (up to 10 Hz)
• High resolution absorption spectra always viewable
• CH4 and CO2 reported on dry mole fraction basis (without sample drying)
• Ideal for eddy covariance flux (standard models)
• Ideal for applications requiring highest accuracy (Enhanced Performance model)
• New -EP model provides measurements over large concentration ranges with negligible drift

Accuracy
Total uncertainty less than 1% of reading
(without calibration, Standard model)

Total uncertainty less than 0.1% of reading
(without calibration, Enhanced Performance model)

(higher accuracy with calibration)

Maximum Drift (Enhanced Performance model)
(15 minute average at STP over 24 hours)
CH4: 0.8 ppbv
CO2: 120 ppbv
H2O: 100 ppmv or 1% reading, whichever greater

Measurement Range (meets all specs)
CH4: 0.1-25 ppmv
CO2: 200-4000 ppmv
H2O: 7000-70000 ppmv

Operational Range (external calibration may be required)
CH4: 0.005-1000 ppmv
CO2: 20-20000 ppmv
H2O: 150-70000 ppmv

Precision (1σ, 5 sec / 100 sec)
CH4: 1 ppbv / 0.25 ppbv
CO2: 200 ppbv / 35 ppbv
H2O: 100 ppmv / 35 ppmv

Response Time (flow time through measurement cell)
<0.1 second (external pump required for 10 Hz response)
10 seconds (with internal pump)

Dimensions (Benchtop Package)
10' H × 38' W × 14' D
(includes embedded video monitor, keyboard, mouse)

Dimensions (Rackmount Package)
Standard model: 8.75” × 19” × 24”
Enhanced Performance model: 14” × 19” × 24”

Weight
Standard models: 65 pounds (30 kg)
Enhanced Performance model: 80 pounds (36 kg)

Ambient Humidity
0-100% RH (non-condensing)

Operating Temperature
Standard models: 5 – 45 °C
Enhanced Performance model: 0 – 40 °C

Power Requirements
115/230 VAC; 50/60 Hz
Standard models: 100W
Enhanced Performance model: 250W
(excluding optional external pump)

Sample Temperature
0-50 °C

Data Storage
Internal Hard Drive (40 gigabytes)

Display
12.1' Color TFT (benchtop package)

Inlet/Outlet Fittings
1/4', 3/8', 1/2' Swagelok

Outputs
Digital (RS232), analog (all gases), Ethernet