Abstract: An analyzer for measuring the ionic values of electrolytes in a sample solution having a fluid flow-through air segment detector (300) and a plurality of fluid flow-through ion selective electrodes (97,98) for measuring the ionic values of electrolytes and a fluid flow-through reference membrane assembly (96) connected in series. There is also a reference electrode (95). There is a reservoir (77) containing an internal filling solution. The reference membrane assembly and the reference electrode are located in the reservoir and exposed to the internal filling solution.A tubular fluid sampling probe (70) having a sampling port (63) aspirates air, sample and liquid reagents through the system.The probe cooperates with a slide valve (64) having a passageway (53) through which the probe reciprocates.

Abstract: A reagent and wash fluid supply system for a flow through analyzing system which includes a tubular fluid sampling probe (70), having a sampling port (63) which aspirates air, sample and liquid reagents through the analyzing system which cooperates with a slide valve (64) having a passageway (53) through which the probe reciprocates. The passageway contains a plurality of chamber ports (46, 47, 48) each of which is sealed from the other ports by the tube sampling probe when its sampling port is positioned within a chamber port. A reagent pouch having a plurality of chambers communicating with a separate chamber port in the slide valve (20, 21) contains liquid reagents and a wash solution. One chamber in the reagent pouch receives waste.