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Overview
Upgrades are now available to operate the TGA200 with a thermoelectrically cooled (TEC) laser, enabling the TGA200 to no longer require liquid nitrogen refills. Upgrading a TGA200 requires a new TEC laser module, TGA200A Input Module, TGA200A Output Module, and TGA TEC software. Contact Campbell Scientific for more information.
The TGA200 Trace-Gas Analyzer measures trace-gas concentration in an air sample using tunable-diode laser absorption spectroscopy (TDLAS). This technique provides high sensitivity, speed, and selectivity. The TGA200 is a rugged, portable instrument designed for use in the field. Common applications include gradient or eddy-covariance flux measurements of methane or nitrous oxide and isotope-ratio measurements of carbon dioxide.
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Detailed Description
Measurement Specifications
The typical 10-Hz concentration measurement noise is given as the square root of the Allan variance with no averaging (i.e., the two-sample standard deviation). This is comparable to the standard deviation of the 10-Hz samples calculated over a relatively short time (10 s). The typical 30-min average gradient resolution is given as the standard deviation of the difference between two intakes, averaged over 30 min. Values shown in Table OV7.7-1 are for ambient concentrations.
TABLE OV7.1-1. Typical Concentration Measurement Noise
| Gas | Wave number (cm-1) | 10 Hz Noise (ppbv) | 30-min Gradient Resolution (pptv) | |
| Nitrous Oxide | N2O | 2208.575 | 1.5 | 30 |
| Methane | CH4 | 3017.711 | 7 | 140 |
| Ammonia | NH3 | 1065.56 | 6 | 200 |
The TGA200 multiple-scan mode can be used to measure suitable pairs of gases. Typical performance for some examples is given in Table OV7.1-2.
TABLE OV7.1-2. Typical Concentration Measurement Noise
| Gas | Wave number (cm-1) | 10 Hz Noise (ppbv) | 30-min Gradient Resolution (pptv) | |
| Nitrous Oxide and Methane | N2O | 1271.077 | 7 | 140 |
| CH4 | 1270.785 | 18 | 360 | |
| Nitrous Oxide and Carbon Dioxide | N2O | 2243.110 | 1.8 | 35 |
| CO2 | 2243.585 | 300 | 6000 | |
Typical performance for isotope ratio measurements is given in delta notation. For example, the δ13C for CO2 is given by:
where Rs is the ratio of the isotopolog concentrations measured by the TGA200 (¹³CO2/¹²CO2) and RVPDB is the standard isotope ratio (¹³C/¹²C). δ¹³C is reported in parts per thousand (per mil or ‰). The 10 Hz noise is the square root of the Allan variance with no averaging. The calibrated noise assumes a typical sampling scenario: two air sample intakes and two calibration samples measured in a 1-minute cycle. It is given as the standard deviation of the calibrated air sample measurements.
TABLE OV7.1-3. Typical Isotope Ratio Measurement Noise
| Gas | Isotope Ratio | Wave number (cm-1) | 10 Hz Noise | Calibrated Noise |
| Carbon Dioxide δ¹³C only | CO2 | 2293.881 | 0.15ppm | >0.03ppm |
| δ¹³C | 2294.481 | 0.5‰ | 0.1‰ | |
| Carbon Dioxide δ¹³C and δ18O | CO2 | 2310.686 | 0.5ppm | 0.1ppm |
| δ¹³C | 2310.347 | 1.5‰ | 0.3‰ | |
| δ18O | 2310.206 | 1.5‰ | 0.3‰ |
Specifications
Analyzer Physical Specifications
- Length:
211 cm (83 in.) - Width:
47 cm (18.5 in.) - Height:
55 cm (21.5 in.) - Weight with peltier-cooled detectors:
78.6 kg (173 lb) - Weight with LN2 detectors:
84.1 kg (185 lb)
Power Requirements
- Analyzer:
90-264 Vac
47-63 Hz
50 W (max)
30 W (typ) - Heater:
90-264 Vac
47-63 Hz
150 W (max)
Compatibility
Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.
Downloads
TGA100A/200 OS v.2.2 (1.2 MB) 12-06-2009
Current TGA100A / 200 Operating System and TGA.CR9 program. Requires the Device Configuration Utility to upload to the TGA system.
Note: This is for use with TGA Windows.
TGA Windows Patch v.2.2 (3.58 MB) 12-06-2009
This will patch upgrade TGA Windows 2.0 and 2.1 to 2.2.