Patent ID: 7247498

Claim:
A method for supplying a portion of primary liquid to be tested for the presence of one or more compounds selected from the group consisting of sulfur, nitrogen, and organic and inorganic carbon compounds, from a primary liquid stream to a chemical analyzer and, when desired, for supplying fluid of known chemical composition in a controlled condition without inviting contamination to the analyzer, said method comprising the steps of: (a) defining a primary liquid flow path extending from a primary liquid inlet, which is connected to a source of primary liquid, to a primary liquid outlet and establishing a flow of the primary liquid along said primary liquid flow path; (b) providing a conduit assembly including a vent conduit and a sampling conduit wherein the sampling conduit has a sample inlet at said primary liquid flow path and a needle tip at a first end, and a sample outlet at the other end connected to a first end of an analyzer fluid line; (c) connecting the other end of the analyzer fluid line to an analyzer such that the analyzer is connected on-line to the primary liquid flowing in the primary liquid flow path; (d) flowing primary liquid from the primary liquid flow path through the sample inlet, the sampling conduit and the analyzer fluid line respectively to the analyzer; and, (e) periodically positioning a sealed-mouth vial of fluid of known chemical composition in the primary liquid flow path such that the needle tip of the sampling conduit and an end of the vent conduit pierce the sealed mouth of the vial, and flowing fluid of known chemical composition through the sample inlet, the sampling conduit and the analyzer fluid line respectively to the analyzer.