Campbell-scientific TGA100A Overview Bedienungsanleitung PDF herunterladen (Seite 13)

TGA100A Trace Gas Analyzer Overview

The TGA100A 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)

O 1271.077 7 140 Nitrous Oxide

and Methane

1270.785 18 360

O 2190.350 5 100

CO 2190.018 5 100

O 2203.733 1.8 35

Nitrous Oxide and

Carbon Monoxide

CO 2203.161 10 200

O 2243.110 2 40 Nitrous Oxide and

Carbon Dioxide

2243.585 400 8000

The multiple-scan mode may also be used to measure different isotopologues

of the same gas. Isotope ratio measurements are typically given in delta

notation:

1−=

std

where R

is the ratio of the isotopologue concentrations measured by the

TGA100A and R

std

is the standard isotope ratio. δ is reported in parts per

thousand (per mil or ‰). Typical isotope ratio performance is given in Table

OV7.1-3. 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 Wavenumber

(cm

-1

)

10 Hz Noise Calibrated

Noise

2293.881 0.2 ppm 0.05 ppm Carbon Dioxide,

C only

C 2294.481 0.5 ‰ 0.1 ‰

2308.225 0.6 ppm 0.15 ppm

C 2308.171 2.0 ‰ 0.4 ‰

Carbon Dioxide,

C and δ

O 2308.416 2.0 ‰ 0.4 ‰

O 1501.846 10 ppm 2 ppm Water,

δD only

δD 1501.813 8 ‰ 2 ‰

O 1500.546 10 ppm 2 ppm

O 1501.188 2 ‰ 0.5 ‰

Water,

O and δD

δD 1501.116 20 ‰ 5 ‰

OV-13

1 2 ... 8 9 10 11 12 13 14

Kommentare zu diesen Handbüchern

Keine Kommentare

Campbell-scientific TGA100A Overview Bedienungsanleitung Seite 13

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Messgeräte Campbell-scientific TGA100A Overview