Patent ID: 7306765

Claim:
An apparatus for chemically analyzing a sample fluid, the apparatus comprising: a first fluid selection valve having a plurality of sample input ports and a sample output port, the first fluid selection valve being configured to selectively fluidly connect each of the sample input ports to the sample output port, and each sample input port being configured to receive a sample fluid; a second fluid selection valve having a plurality of reagent input ports and a reagent output port, the second fluid selection valve being configured to selectively fluidly connect each of the reagent input ports to the reagent output port, and each reagent input port being configured to receive a reagent fluid; a fluid injection valve adjustable between first and second positions, the fluid injection valve being configured to receive the sample and reagent fluids from the sample output port of the first fluid selection valve and the reagent output port of the second fluid selection valve; a sample vessel fluidly connected to the fluid injection valve and configured to receive the sample fluids therefrom; an analysis device fluidly connected to the injection valve via the sample vessel and configured to receive the sample and reagent fluids from the fluid injection valve, the analysis device configured to determine at least one chemical characteristic of the sample fluid; and a mixer configured to mix fluids in the analysis device, wherein the fluid injection valve in the first position fluidly connects the sample output port to the sample vessel such that the sample fluids can be injected into the sample vessel, and the fluid injection valve in the second position fluidly connects the reagent output port to the sample vessel such that the reagent fluids can be injected into the sample vessel.