Ametek ta3000F, Руководство пользователя

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User Manual | 11
OVERVIEW
Model ta Gas Purity Monitor
Introduction
The ta3000F Process Gas Analyzer is a trace level gas chromatograph
capable of detecting ppb concentrations of contaminants in sample gas
matrices. The system consists of a microprocessor controlled gas chro-
matograph utilizing the Trace Analytical Flame Ionization Detector (FID).
Functional Overview
In order to achieve specified performance, the ta3000F performs these
primary functions:
Sample Introduction and Component Separation
Samples are introduced into the instrument via air actuated gas sampling
valves or manual injections. Components of interest are separated in a
1/8” Column(S) inside a heated column oven.
Flame Ionization Detection
Species eluting from the FID column set pass immediately into the heated
bed of ruthenium oxide (Ru
3
O
4
)) and the flame detector. Within the ru-
thenium oxide bed, the general reaction occurs:
CO
x
+ (2+X)H
2
=> CH
4
+XH
2
O (vapor)
Where CO
x
is an appropriate carbon-oxygen compound gas. For carbon
dioxide the equilibrium reaction is:
CO
x
+ 4H
2
=> CH
4
+2H
2
O (vapor)
The resulting methane is quantitatively determined by means of flame
ionization immediately downstream of the ruthenium oxide bed. Meth-
ane and other simple hydrocarbons pass through the methanizer unaf-
fected. Within the flame ionization region hydrocarbons are reduced via a
series of reaction steps to CH
+ ions and electrons prior to complete com-