Teledyne 6750 User Manual download pdf (Page 25)

Total Organic Carbon Analyzer Theory of Operation

Teledyne Analytical Instruments 13

Figure 2-7: Sample Handling TOC-True

2.4.2.2 GAS PHASE SAMPLE HANDLING

Referencing Figure 3-5 and “As Built” drawings in the Appendix, a

carrier gas of (99.8%) pure oxygen or CO

and hydrocarbon-free air is

required. Erroneous TOC analysis will occur if the carrier gas has these

impurities, since both CO

and Hydrocarbon gases will contribute a

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

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Teledyne 6750 User Manual Page 25