GB1275689A - Liquid mixing apparatus - Google Patents

Abstract

1275689 Sample preparation for analysis; mixing flowing streams TECHNICON INSTRUMENTS CORP 20 May 1969 [28 May 1968] 36188/70 Headings B1C and B1X Apparatus for mixing a stream of diluent with a stream of test sample so that a constant volume flow stream of diluted sample of a predetermined but variable concentration can be produced for analysis comprises a sample tube A, Fig. 1, carrying a stream of sample, a diluent tube B carrying a stream of diluent, two junction means 24, 31, three control valves 26, 28, 30, conduits 25, 27, 29, 31, 34 connecting the valves to the junction means, three tubes 13, 14, 15 having different internal diameters, Fig. 2, a proportioning pump E for causing a continuous stream to flow through the three tubes, a junction means F with an exit tube through which flows the constant volume flow diluted sample stream. The concentration of the diluted sample stream is altered by resetting one or more of the valves 26, 28, 30 to select whether diluent or sample passes through each of the tubes 13, 14, 15. The diluted stream can then be passed consecutively or directly to various treatment circuits G, H, I and J for testing. Gas may be separated off in circuit G at 41 for analysis, using the gas to segment a flowing stream in 19. Circuit G includes dialysers 65 and 72, and circuit J includes a colorimeter and a flow cell 23. Sample fed through tube A may be blood or urine, and diluent fed through tube B may be a pH 5 isotonic solution of acetate buffer. Members 56 and 57 are heating baths and 69 is an incubator.