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Total Organic Carbon Analyzer
Figure 2-7: Sample Handling TOC-True
2.4.2.2 G
P
S
AS
HASE
Referencing Figure 3-5 and "As Built" drawings in the Appendix, a
carrier gas of (99.8%) pure oxygen or CO
required. Erroneous TOC analysis will occur if the carrier gas has these
impurities, since both CO
higher TOC value to the analysis than is actually present in the sample.
An Oxygen Generator (P/N ST200025) is available from Teledyne
that separates oxygen from the ambient air. It is a pressure swing
absorption PSA device requiring only electricity only to operate. Also
available from Teledyne is an Instrument Air Purifier (P/N ST200019).
This device can supply the oxygen demands of the instrument using
facility instrument air.
Facility carrier gas is introduced to the analyzer, regulated at 15± 2
psi, and then controlled by an internal mass flow controller (MFC-1) to
precisely control the flow rate of the carrier.
Note: Precise carrier gas flow control is mandatory for accurate
Teledyne Analytical Instruments
H
AMPLE
ANDLING
and Hydrocarbon gases will contribute a
2
Theory of Operation
and hydrocarbon-free air is
2
13
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