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Campbell TGA200 Instruction Manual

Manual is about: Trace Gas Analyzer

Summary of TGA200

  • Page 1

    Tga200 trace gas analyzer overview 9/11 c o p y r i g h t © 2 0 1 1 c a m p b e l l s c i e n t i f i c , i n c ..

  • Page 3: Warranty

    Warranty “products manufactured by campbell scientific, inc. Are warranted by campbell scientific, inc. (“campbell”) to be free from defects in materials and workmanship under normal use and service for twelve (12) months from date of shipment unless otherwise specified on the corresponding campbell...

  • Page 4: Assistance

    Assistance products may not be returned without prior authorization. The following contact information is for us and international customers residing in countries served by campbell scientific, inc. Directly. Affiliate companies handle repairs for customers within their territories. Please visit www...

  • Page 5

    Tga200 overview table of contents pdf viewers: these page numbers refer to the printed version of this document. Use the pdf reader bookmarks tab for links to specific sections. 1. System components ...................................................2 2. Theory of operation ............................

  • Page 7

    Tga200 trace gas analyzer overview 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...

  • Page 8: 1.  System Components

    Tga200 trace gas analyzer overview 1. System components figure 1-1 illustrates the main system components as well as additional equipment needed to operate the tga200. These system components include: • tga200 analyzer • sample intake (15838 shown): filters the air sample and controls its flow rate....

  • Page 9: 2.  Theory of Operation

    Tga200 trace gas analyzer overview 2. Theory of operation 2.1 optical system the tga200 optical system is shown schematically in figure 2-1. The optical source is a lead-salt tunable diode laser that operates between 80 and 140 k, depending on the individual laser. The tga200 ln2 laser dewar include...

  • Page 10

    Tga200 trace gas analyzer overview 2.2 laser scan sequence the laser is operated using a scan sequence that includes three phases: the modulation phase, the zero-current phase, and the high-current phase, as illustrated in figure 2-2. The modulation phase performs the actual spectral scan. During th...

  • Page 11

    Tga200 trace gas analyzer overview 2.3 concentration calculation the reference and sample detector signals are digitized, corrected for detector offset and nonlinearity, and converted to absorbance. A linear regression of sample absorbance vs. Reference absorbance gives the ratio of sample absorbanc...

  • Page 12: 4.  Multiple Ramp Mode

    Tga200 trace gas analyzer overview 4. Multiple ramp mode the tga200 can be configured to measure two or three gases simultaneously by alternating the spectral scan wavelength between nearby absorption lines. This technique requires that the absorption lines be very close together (within about 1 cm ...

  • Page 13: 6.  Specifications

    Tga200 trace gas analyzer overview 6. Specifications 6.1 measurement noise the typical 10 hz-concentration measurement noise, given in table 6-1, is calculated as the square root of the allan variance with 100 ms averaging (i.E., the two-sample standard deviation). This is comparable to the standard...

  • Page 14

    Tga200 trace gas analyzer overview table 6-3. Typical isotope ratio measurement noise gas isotope ratio wavenumber (cm -1 ) 10 hz noise calibrated noise (‰) co 2 2293.881 0.15 ppm 0.03 ppm carbon dioxide δ 13 c only δ 13 c 2294.481 0.5 ‰ 0.1 ‰ co 2 2310.686 0.5 ppm 0.1 ppm δ 13 c 2310.347 1.5 ‰ 0.3 ...

  • Page 15

    Tga200 trace gas analyzer overview time (seconds) c once nt rat io n (p pm ) figure 6-1. Concentration time series showing response of tga200 frequency (hz) am pl itude figure 6-2. Frequency response of the tga200. The blue line is the measured response, the red line is the model response, the green...

  • Page 16

    Tga200 trace gas analyzer overview 10 6.3 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 ...

  • Page 18

    Campbell scientific companies campbell scientific, inc. (csi) 815 west 1800 north logan, utah 84321 united states www.Campbellsci.Com • info@campbellsci.Com campbell scientific africa pty. Ltd. (csaf) po box 2450 somerset west 7129 south africa www.Csafrica.Co.Za • cleroux@csafrica.Co.Za campbell sc...