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TGA200 Trace Gas Analyzer

Overview

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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 .

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Содержание TGA200

Страница 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 ...

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Страница 3: ...return such products by surface carrier prepaid within the continental United States of America To all other locations Campbell will return such products best way CIP Port of Entry INCOTERM 2010 prepaid This warranty shall not apply to any Campbell products which have been subjected to modification misuse neglect improper service accidents of nature or shipping damage This warranty is in lieu of a...

Страница 4: ...ng container Campbell Scientific s shipping address is CAMPBELL SCIENTIFIC INC RMA _____ 815 West 1800 North Logan Utah 84321 1784 For all returns the customer must fill out a Statement of Product Cleanliness and Decontamination form and comply with the requirements specified in it The form is available from our web site at www campbellsci com repair A completed form must be either emailed to repa...

Страница 5: ...de 6 5 User Interface 6 6 Specifications 7 6 1 Measurement Noise 7 6 2 TGA200 Frequency Response 8 6 3 Physical Specifications 10 Figures 1 1 TGA200 system components 2 2 1 Schematic diagram of TGA200 optical system 3 2 2 TGA200 laser scan sequence 4 5 1 Real time graphics screen 6 6 1 Concentration time series showing response of TGA200 9 6 2 Frequency response of the TGA200 9 Tables 6 1 Typical ...

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Страница 7: ...n 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 It can measure one of a large number of gases by choosing appropriate lasers and detectors 1 ...

Страница 8: ...nd controls its flow rate Sample pump RB0021 L shown Pulls the air sample and reference gas through the analyzer at a low pressure Reference gas Tank of reference gas with pressure regulator supplied by user Reference gas connection 15837 shown Flow meter needle valve and tubing to connect the reference gas to the analyzer Datalogger CR3000 shown Computer supplied by user Used to check status and ...

Страница 9: ...orbed proportional to the concentration of the target gas A lens at the outlet of the sample cell focuses the beam onto the sample detector The portion of the beam that is reflected by the beamsplitter passes through a reference cell similar to the sample cell and is focused on the reference detector A prepared reference gas having a known concentration of the target gas flows through the referenc...

Страница 10: ...g the zero current phase dissipates less heat in the laser causing it to cool slightly The laser s emission frequency depends on its temperature as well as its current Therefore the temperature perturbation caused by reduced current during the zero current phase introduces a perturbation in the laser s emission frequency During the high current phase the laser current is increased above its value ...

Страница 11: ...available four with an optional second laser mount allowing selection of up to four different species by rotating the dewar installing the corresponding cable and performing a simple optical realignment The standard detectors used in the TGA200 are Peltier cooled and operate at wavelengths up to 5 microns These detectors are used for most gases of interest including nitrous oxide N2O methane CH4 a...

Страница 12: ...ome other pairs of gases such as nitrous oxide and carbon dioxide or nitrous oxide and methane but the measurement noise will generally be higher than if a single gas is measured For measurements of a single gas the laser wavelength is chosen for the strongest absorption lines of that gas Choosing a laser that can measure two gases simultaneously involves a compromise Weaker absorption lines must ...

Страница 13: ...to measure suitable pairs of gases Typical performance for some examples is given in Table 6 2 TABLE 6 2 Typical Concentration Measurement Noise for Multiple Scan Lasers Gas Wave number cm 1 10 Hz Noise ppbv 30 min Gradient Resolution pptv N2O 1271 077 7 140 Nitrous Oxide and Methane CH4 1270 785 18 360 N2O 2243 110 1 8 35 Nitrous Oxide and Carbon Dioxide CO2 2243 585 300 6000 Typical performance ...

Страница 14: ...The flow was 10 slpm and the pressure was 20 mb for a calculated residence time of 50 ms The width of the pulse at half peak height is approximately 50 ms as expected The measured frequency response Fourier transform of the measured pulse is shown in Figure 6 2 The blue curve is the measured frequency response The purple curve is a model of the frequency response This model includes two components...

Страница 15: ...es showing response of TGA200 Frequency Hz Amplitude FIGURE 6 2 Frequency response of the TGA200 The blue line is the measured response the red line is the model response the green line is the ideal response and the red line is the response time of an ideal mixing volume with residence time of 14 ms 9 ...

Страница 16: ...gth 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 typical Heater 90 264 Vac 47 63 Hz 150 W max 30 W typical ...

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Страница 18: ...entific Canada Corp CSC 11564 149th Street NW Edmonton Alberta T5M 1W7 CANADA www campbellsci ca dataloggers campbellsci ca Campbell Scientific Centro Caribe S A CSCC 300 N Cementerio Edificio Breller Santo Domingo Heredia 40305 COSTA RICA www campbellsci cc info campbellsci cc Campbell Scientific Ltd CSL Campbell Park 80 Hathern Road Shepshed Loughborough LE12 9GX UNITED KINGDOM www campbellsci c...

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