TGA200A Trace Gas Analyzer
High Speed, Low Maintenance, Field Rugged
Measures CO2 isotopes,
N2O, or CH4
weather applications water applications energy applications gas flux & turbulence applications infrastructure applications soil applications


The TGA200A Trace Gas Analyzer measures trace gas concentrations in an air sample using tunable-diode laser absorption spectroscopy (TDLAS). This technique provides high sensitivity, speed, and selectivity. Its simple design allows it to measure one of many gases by choosing an appropriate laser source. The TGA200A features a 1.5 m single-pass optical measurement system that uses a thermoelectrically cooled laser. 

The TGA200A is housed in a rugged environmental enclosure designed for use in demanding climates ranging from high-latitude boreal forests, permafrost, and tundra to agriculturally intensive mid-latitude regions and equatorial rainforests. Common applications include slow gradient or high speed eddy-covariance flux measurements of nitrous oxide, methane, or isotopologs of carbon dioxide in all global ecosystems.

Campbell Scientific has been manufacturing TGAs since 1993, and the TGA200A is the result of over 20 years of research and development. Even though previous generations of the TGA (TGA100, TGA100A, and TGA200) have the same core technology, the TGA200A builds upon this succession with further improvements. For more information about the TGA200A, contact Campbell Scientific, Inc.

Benefits and Features

  • Thermoelectrically cooled laser; no cryogenic cooling required
  • Small sample cell volume that provides superior frequency response
  • Choice of laser sources to measure CO2 isotopes, N2O, or CH4
  • Robust optical system that does not require cleaning in the field
  • Rugged environmental enclosure that allows the TGA200A to be placed outside
  • 500 Hz measurment rate that supports excellent synchronization with our CSAT3 Sonic Anemometer, making the TGA200A ideal for eddy-covariance flux applications
  • Simple Windows> user interface for setup, configuration, and real-time monitoring
  • Advanced sampling systems also available for low-flow applications such as profile, gradient, or user-supplied chamber measurements
  • Laser upgrades available to existing TGA customers (contact Campbell Scientific for more information)

Ask about our custom, low flow sampling systems for gradient flux or chamber applications.  Our system components can support up to 12 air sample inlets and up to 4 calibration gas inlets.


TGA200A side view
TGA200A side view
TGA200A side view
TGA200A side view (top of enclosure sitting behind)
TGA200A side view (top of enclosure removed)
TGA200A top view
TGA200A laser end of the optical bench
TGA200A detector end of the optical bench
TGA200A electronics box
TGA200A side view (feedthrough cover opened)
TGA200A feedthrough bracket and plumbing connections
TGA200A side view (with pn 16599 installed)


Measurement Rate 500 Hz
Sample Cell Volume 200 ml
Dimensions 211 x 47 x 55 cm (83 x 18.5 x 21.5 in.)
  • 5.4 kg (12.0 lb) for power module with cable
  • 62.8 kg (138.5 lb) for TGA200A

Typical Measurement Noise

-NOTE- Preliminary Results

Allan deviation with 100 ms averaging time.
Nitrous Oxide (N2O) - Laser pn 30478 1.5 nmol mol-1
Methane (CH4) - Laser pn 30477 7.0 nmol mol-1
Nitrous Oxide (N2O) - Laser pn 31121 1.8 nmol mol-1
Carbon Dioxide (CO2) - Laser pn 31121 0.3 μmol mol-1 (based on the 13C16O16O isotopolog)
Carbon Dioxide (CO2) - Laser pn 31119 0.15 μmol mol-1
δ13C - Laser pn 31119 0.5 ‰
Carbon Dioxide (CO2) - Laser pn 30877 0.5 μmol mol-1
δ13C - Laser pn 30877 2.0 ‰
δ18O - Laser pn 30877 2.0 ‰

Power Requirements

Analyzer (TE-cooled laser) 90 to 264 Vac, 47 to 63 Hz, 34 W (max) 22 W (typical)
Heater 90 to 264 Vac, 47 to 63 Hz, 150 W (max) 50 W (typical)


Datalogger Considerations

Data is collected from the TGA200A using a Campbell Scientific datalogger. The TGA200A is compatible with dataloggers that support SDM communications. In many cases, a sampling system containing a datalogger is ordered with the TGA200A. Contact Campbell Scientific for more details about sampling systems and compatibility with user-supplied components, such as leaf chambers.

Compatible Contemporary Dataloggers

CR1000 CR3000 CR6

Compatible Retired Dataloggers



TGA200A Firmware v.1.1 (1.1 MB) 12-02-2015

The TGA200A firmware is used to support the TGA200A or prior TGA models that have been upgraded to use a thermoelectrically cooled (TEC) laser.

The TGA firmware includes the OS that must be uploaded to the analyzer's CPU board before operating a TEC laser.

Warning: Download of TGA200A Firmware should only be done for use with TGA models running TEC lasers!

TGA TEC v.1.1 (10.6 MB) 12-02-2015

The TGA TEC Support Software is used to support the TGA200A or prior TGA models that have been upgraded to use a thermoelectrically cooled (TEC) laser.

TGA TEC is a user-interface software package that allows users to connect to the analyzer, set settings, and monitor real-time analyzer performance.

TGA TEC 1.1 is compatible with the Windows 7 operating system or newer.

Warning: Download of TGA TEC v1.1 should only be done for use with TGA models running TEC lasers!

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