Metrohm 875 KF Gas Analyzer - Manual (Page 24)

4.1 Arrangement of the gas-carrying system
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If samples contain nonvolatile parts, such as oil contaminations, then
these parts are held back by the filter element (4-13). Contamination of
the mass flow controller is thus excluded.
A thermally conductive connection exists between the oil filter and the
heating block, which significantly increases the filter temperature. The
retarding effect of oils on water is reduced in this way. The filters and the
vaporizer are cleaned by rinsing the lines with a suitable solvent via stop-
cock 2 (4-6). The corresponding dosing device forms part of the optional
scope of delivery of the 875 KF Gas Analyzer.
Figure 4 Schematic arrangement of the system
A Nitrogen B Rinsing with solvent
C Sample D Waste gas
E To the coulometer cell
1 Drying cartridge (nitrogen) 2 Stopcock 1 (deaeration)
3 Valve 1 (nitrogen) 4 Check valve
5 Mass flow controller 6 Stopcock 2 (rinsing with solvent)
7 Valve 2 (sample) 8 Valve 4 (measurement)
9 Sample input filter 10 Precision control valve (vaporizer regu-
lator)