Teledyne 6750 operating instructions 6:Sample Handling for TOC -Direct

Theory of Operation Model 6750

actual measurement of the TIC, a more accurate TOC is achieved since (TOC = TC - TIC).

“TOC-Direct” mode is preferred for accuracy when no or little volatiles are present. In this mode, the carbonate-free sample is extracted from the organic carbon reactor and measured directly as TOC. Pump (P –1) continuously introduces the carbonate-free sample to the reactor. No valves or complicated injection mechanisms are required. The remaining organic carbon is oxidized to CO2 in the reactor. The resultant gaseous stream is directed to a gas/liquid separator and then to the NDIR. The CO2 gas is analyzed by the infrared analyzer (NDIR) as a direct correlation of Total Organic Carbon (TOC).

A computer controls all functions and outputs. A “Touch Screen” provides operator interface and a paperless chart recorder utility.

Figure 2-6: Sample Handling for TOC -Direct

Teledyne Analytical Instruments 12