Teledyne 6750 operating instructions Sample Handling TOC-True

Total Organic Carbon Analyzer Theory of Operation

Figure 2-7: Sample Handling TOC-True

2.4.2.2GAS PHASE SAMPLE HANDLING

Referencing Figure 3-5 and “As Built” drawings in the Appendix, a carrier gas of (99.8%) pure oxygen or CO2 and hydrocarbon-free air is required. Erroneous TOC analysis will occur if the carrier gas has these impurities, since both CO2 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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