METHOD AND APPARATUS FOR SUPPLYING A QUANTITY OF LIQUID CONTAINING AN INCLUSION OF A FLUID AN FOR MEASURING LIQUID FLOW

摘要

1520457 Liquid metering apparatus CONTRAVES AG 22 Sept 1975 [23 Sept 1974] 38865/75 Heading B8N An apparatus for supplying a liquid which includes an immiscible fluid inclusion which can be detected during flow of the liquid for metering purposes, flow rate determination, viscosity measurement or counting of particles, e.g. blood corpuscles in the liquid, comprises a junction duct 12 in the flow path 11, 10 of the liquid and a fluid supply to the duct 12 controlled by a valve 19. The liquid is moved along its flow path 11, 10 when a valve 6 is opened by a pump situated upstream, Fig. 6 (not shown), or downstream of the junction duct 12. The inclusion is detected by photo-electric detectors 4, 5 which operate in response to a change in the refractive index of the fluid flowing past them. The detectors operate in conjunction with atimer to determine the flow rate of the volume between the detectors or a counter to measure the number of particles in the volume. The immiscible fluid may be air, nitrogen to form a gas bubble or an immiscible liquid, e.g. water, if the main liquid is benzene hydrocarbon or chloroform. The pump may incorporate a valve or be fluid tight to effect its own sealing. A pressure sensor either in the liquid separator (53) gas space (54), Fig. 5 (not shown), or in a pressure gas chamber (17), Fig. 6 (not shown) may control the pump.