Abstract: An automatic continuous multinominal analyzer comprises suction tubes to be inserted into vessels containing a reagent, each suction tube having a pair of electrode lines. The contacts of each pair of electrode lines are located above the suction port of the suction tube. Hence, the contacts are isolated from each other when the level of the reagent in a vessel is lower than the contacts, even if the reagent still remains in the vessel. If it is detected that the contacts in a vessel are isolated, this indicates that the vessel is almost empty. A display indicates a vessel which is almost empty on the basis of the result of the detection as to whether the contacts in the vessel are isolated. After a vessel is indicated on the display, the controller continues suction of the reagent and an analysis operation until the reagent in the indicated vessel is reduced to the minimum level which can be extracted through the suction tube.

Abstract: A process and apparatus for recovering propane product from HF alkylation process that is substantially free of HF acid. The invention allows for the improvement in the operation of an HF alkylation propane stripper by utilizing a bottoms recycle stream.

Abstract: Method and apparatus for sensing fluid interface(s) in a complex fluid such as centrifuged blood, includes a sensing assembly with a microwave source and a microwave sensor positioned in spaced opposed relation, the microwave source and sensor defining a microwave propagation path. Relative motion is induced between the sample container and the microwave energy propagation path in the region between the source and sensor in a direction that intersects and is essentially perpendicular to the microwave energy propagation path; and processor apparatus responsive to the scanning apparatus and the modification in microwave energy sensed by the microwave sensor provides an indication(s) of the location(s) of a fluid interface(s) in the container.

Abstract: A device for measuring the diameter of the growing portions of the single crystals grown by the Czochralski technique is provided. This device is capable of measuring the crystal diameter with a high degree of accuracy over a wide range from the small-diameter portion thereof to the large diameter portion. A one-dimensional camera 28 and a two-dimensional camera 48 are fixed to a shoulder chamber 34 in such a manner that the optical axes thereof are parallel to each other. An optical path switch-over device, consisting of a cylinder 56, a movable plane mirror 52 mounted on a cylinder rod, and a fixed plane mirror 54, is provided. When the diameter of a neck portion of the single crystal 20 having a diameter of 10 mm or less is measured, the light reflected by the plane mirrors 52 and 54 is made incident on the two-dimensional camera 48, and the diameter of a bright ring 27 is measured on the basis of the image obtained by the two-dimensional camera.

Abstract: A melt replenishment system for dendritic web growth having a pellet feed arrangement, which distributes equal amounts of feed material to a pair of feed tubes in communication with opposite ends of a crucible to maintain a melt pool at a constant level and a cover gas system, which keeps the feed tubes flowing and helps maintain thermal consistency within the melt.

Abstract: A plastic light conduit of cross-linked polymer material having good light transmitting characteristics, without voids or noticeable bubbles, is disclosed. Also disclosed is a method of manufacture and an apparatus, involving progressive heating of reactive monomer mixture in a tube which is submerged in a progressive reactor utilizing cold oil to maintain a cold, non-reacting zone, and hot water to create a hot zone that causes reaction, while simultaneously carrying away the excess exothermic heat of reaction.

Abstract: A method and apparatus for conducting a catalytic distillation process is provided which allows for maintaining a liquid level in selected portions of the catalyst bed. Three particular processes disclosed are the production of methyl tertiary butyl ether, tertiary butyl alcohol and cumene.

Abstract: A filter apparatus for filtering a plurality of liquid or gas fluid samples containing particles to be filtered, such as bacteria or cells. The apparatus includes a filter; a device for simultaneously and independently filtering fluid samples on the filter; and apparatus for force filtering the samples. The device for simultaneously and independently filtering fluid samples includes at least one gasket including a plurality of through perforations held clamped in a sealed manner against one face of the filter by appropriate clamps. The clamps have perforations located for being brought into alignment with the perforations through the gasket and for cooperating therewith to put an upstream face of the gasket into communication, via the filter, with a plurality of independent inlets for samples of fluid to be filtered, and to put a downstream face of the gasket into communication with a plurality of likewise independent outlets for the fluid samples.

Abstract: A system for safely disposing of pathogenic waste materials. The waste material is disposed in a chamber and heated by forced hot air to temperatures above approximately 450.degree. F. to destroy harmful bacteria within several minutes. The high temperatures melt plastic waste materials. The harmless waste is cooled providing a solid block in which syringes and other sharp items are generally encased. The temperature within the chamber is continuously sensed and the operation of the apparatus is microprocessor controlled to adjust the process time in accordance with the load size. The microprocessor further stores the sensed temperature to provide verification that the waste has been exposed to sufficient temperatures and for a sufficient time to render such waste harmless.

Abstract: A method of measuring the diameter of a silicon single crystal. At intervals of a given rotational period of a pulled single crystal being pulled by the CZ method, optical means samples the luminance distribution of a fusion ring to obtain measured diameter values of the pulled single crystal so that the measured diameter values are processed by a low-pass filter to generate filter output values converted to time series diameter data and the filter output values are subjected to moving averaging to calculate a diameter value.

Abstract: An autoclave has a water level sensor in a water reservoir in the pressure vessel. An external water tank is connected to the reservoir via an electrically-operated valve. An electrical resistance heating element in the reservoir heats the sensor if it indicates a full level at the start of operation, in order to dry any exposed part of the sensor and thereby prevent an erroneous output from the sensor caused by water clining to it. This heating of the sensor can be repeated if it continues to indicate a full level. If a low level output is produced by the sensor, the valve is opened to allow water to flow from the tank to the reservoir. If the valve remains open for longer than a predetermined time without the sensor indicating a full level, the autoclave produces a fault signal.

Abstract: A cleaning system and dispenser are disclosed which feature a reservoir for retaining a liquid detergent solution; a chamber for retaining a mass of solid, dissolvable detergent; a measurement device for measuring the concentration of detergent in the liquid detergent solution; and a flow control device for circulating the liquid detergent solution from the reservoir into contact with the solid detergent so as to dissolve a portion of the solid detergent and increase the concentration of detergent in the liquid detergent solution. The circulation of the liquid detergent solution is in response to a signal from the concentration measuring device that the concentration of detergent in the liquid detergent solution has fallen below a predetermined minimum. The dispenser also includes a measurement device for measuring the volume of solution in the reservoir and for adding fresh water to the reservoir when the volume of solution is below a predetermined minimum.

Abstract: An improved process and apparatus for hydrogenating a stream of hydrocarbons is provided. The pressure and temperature of the stream are elevated and the stream is passed through two or more serially connected hydrogenation reaction zones. While passing through the reaction zones hydrogen is dispersed in the stream and the stream is caused to flow along successive downward and upward paths. The reacted stream is cooled prior to reducing the pressure exerted thereon.

Abstract: A method and apparatus for conducting a catalytic distillation process is provided which allows for maintaining a liquid level in selected portions of the catalyst bed. Three particular processes disclosed are the production of methyl tertiary butyl ether, tertiary butyl alcohol and cumene.

Abstract: A method for analyzing water or other liquid, in particular rain water, comprises the steps of providing a collector comprising at least first and second volumetric cells and a mechanism for causing water to flow selectively into the cells and for causing water to flow selectively from the cells. Water is caused to flow into a first one of the cells while it is prevented from flowing into the other one of the cells. The water collected in the first cell is caused to flow to a property determining cell when the first cell has been filled to a predetermined volume, and simultaneously water is prevented from flowing into the first cell while it is now permitted to flow into the second volumetric cell. The water collected in the second cell is then permitted to flow to a property determining cell when the second cell has been filled to a predetermined volume, and simultaneously the water is prevented from flowing to the second cell while it is now permitted to flow to the first cell.

Abstract: This invention relates to a system for monitoring and controlling foam in a liquid tank utilizing a foam level sensing device positioned at a downstream location from a defoaming agent delivery arrangement. The foam level sensing device comprises a float having a plurality of foam sensors positioned at various levels above the float and provides signals to a control device regarding the level of foam in the tank. The control device provides instructions to the defoaming agent delivery arrangement so to provide a proper amount of defoaming agent to the tank. The defoaming agent delivery arrangement may be operated continuously and includes a backup delivery device for times when the delivery means runs out of defoaming agent or at times when foam is generated at an exceptional rate.

Abstract: A dilution and mixing cartridge is provided that allows single (or multiple) dilutions of a sample with a diluent in a disposable cartridge in which a measurement, such as optical density, is made. Addition of sample to the device automatically measures the sample, and addition of diluent automatically causes a fixed ratio of sample and diluent to enter a receiving chamber, in which mixing and measurement can take place. A number of preferred embodiments are provided in which the diluent application site is located at a vertical height below the sample application site, flow directing chambers are provided to control flow of desired volumes of sample or diluted sample at the appropriate locations in the device and to direct excess sample and diluent to waste locations, or control mechanism are provided at flow directing chambers and other internal locations to verify correct operation of the device.

Abstract: An isolation fluid control device and water cup for use in an automated, random-access, isolation fluid-based, analytical instrument. The cup, in operation, contains two immiscible liquids. The cup is provided with inlets and outlets, and additionally comprises a liquid level control structure and structure operable to permit passage of one liquid therethrough to the substantial exclusion of the other liquid.

Abstract: An apparatus for continuously charging a liquid reactant with a gas is provided. The gas is dispersed in the reactant through a hollow stirrer in a gassing tank. The quantity of gas introduced per unit time is kept constant.

Abstract: In the method of this invention, dispensed volume is calculated from the ratio of the absorbance values for a sample delivered by a precisely calibrated pipette and the sample dispensed by an automated pipette. This links a gravimetric method of calibration to a colorimetric method.

Abstract: A liquid level sensing apparatus, including a bridge circuit sensitive to an element the impedance between a liquid sample and a pipette for providing a signal corresponding to the impedance, a phase detector for phase-detecting the output signal of the bridge circuit, a high-pass filter for differentiating the phase detection signal and a circuit for inhibiting the passage of a variation component of a signal from a band-pass filter and passing a liquid level signal component.

Abstract: A preservative-bearing pad and a method of using same to treat the interface between a railroad cross tie and tie plate. A sandwich of water-soluble active ingredient disposed between two layers of biodegradable hydrophilic backing is simply placed on the adzed portion of a cross tie prior to installation of the tie plate and rail during a rail laying or relaying operation.

Abstract: A system for visualizing the solid-liquid interface of a growing crystal in-situ using a modified vertical Bridgman crystal growth method. An infrared source emits radiation which passes through a furnace window, the crystal material and the growth ampoule which are all transparent to the radiation and is picked up by an IR camera focused on the solid-liquid interface. The IR camera produces radiographs of the solid-liquid interface. The system provides in-situ operation by every radiograph being converted into a visible image in real time by the output from the camera fed to an image processor, including a television monitor and a VHS recorder. A feedback means from the image processor controls the parameters of the growth process such as the furnace temperature and the movement of the growth ampoule.

Abstract: The occurrence of physical contact between a conductive probe and a surface of a liquid held in a container is detected as the probe is moved toward and eventually touches the liquid surface; a conductor is disposed on the other side of the container from the probe; an electrical signal is sent through the liquid between the conductive probe and the conductor, and the time when physical contact has occurred is determined based on when the resulting electrical signal which has passed through the liquid exceeds a threshold; and the threshold is determined based on the resulting electrical signal. In another aspect, the electrical signal is pulsed, and the resulting electrical signal is synchronously detected as the basis for determining when the physical contact has occurred.

Abstract: In a separation system (1 to 11) for tube reactors or autoclaves, which are used for the polymerization of ethylene or copolymerization of ethylene with ethylenically unsaturated comonomers in the presence of an initiator under from 500 to 4,000 bar and at from 150.degree. to 350.degree. C., for reducing the emission of solids during pressure relief processes of the reaction mixture present in the reactor or autoclave, the reaction mixture let down is fed via two or more separating containers (1, 1a) installed in series before it reaches the atmosphere.

Abstract: Analytical equipment, in which liquid substances in sample containers and reagent containers are delivered to reaction cells by a vertically movable probe. The sample containers and the reagent containers are supported on a rotatable metal plate. The metal plate is rotated to place one of the sample containers or reagent containers at a sample or reagent pipetting position. The probe transmits a high-frequency signal to detect a change in electrostatic capacitance between itself and the metal plate at a time the probe is put in contact with a liquid substance in the sample or reagent container. A spline shaft for moving the probe in a vertical direction has a detection plate, and a control signal is generated when the detection plate reaches a predetermined position. The generation of the high-frequency signal is stopped when the probe begins to make a descending motion until the control signal is generated, to reduce the adverse effect of disturbing waves on various parts.

Abstract: There is disclosed an apparatus for forming hydrophilic polymeric solutions wherein a vessel is provided with a mixing assembly comprised of co-axially and vertically-disposed inner and outer cylindrically-shaped wall members mounted to a bottom wall member wherein the inner wall member defines a mixing chamber and is provided with orifices about a lower portion thereof to provide fluid communication to a solution chamber defined between the wall members and wherein an upper portion of the outer wall member defines a weir to the vessel and wherein an agitator is positioned within the mixing chamber to admixed feed hydrophilic polymer and solvent in a vortex of polymeric solution contained in the mixing chamber and to cause the polymeric solution to overflow the weir into the vessel.

Abstract: A vapor/liquid separator and liquid distributor which is especially suitable for small catalytic hydrodewaxing reactors is disclosed. A mixed phase stream is discharged into a V/L separator above a vessel. A liquid level is maintained in the V/L separator using a liquid level controller. Preferably the liquid is filtered, then passed through a spray nozzle for distribution over a fixed bed of contact material in the vessel, e.g., catalyst. The vapor phase from the V/L separator is added to the top of the reactor. The process and apparatus is especially useful in catalytic hydrodewaxing.

Abstract: A system for delivering liquid catalyst to a core-making machine includes a single fireproof cabinet in which is located a catalyst storage tank. The storage tank receives catalyst from catalyst supply drums that are positioned one at a time in a pumping station located in the cabinet beside the tank and emptied into the tank by a barrel pump. A flash-off station is located in the cabinet beside the pumping station for receiving emptied drums and an exhaust hose, that is coupled to a scrubber system exhaust duct, is positionable within the drum to carry away vapors produced in the drum as residual catalyst flashes off. A catalyst supply pump is coupled for pumping liquid catalyst from the storage tank to a gassing unit of a core-making machine.

Abstract: A continuous reactor system useful for treating petroleum oil in a multi-phase fixed bed catalytic reactor comprising a system for:feeding the oil and a reactant gas at production flow rates above a first bed of porous solid catalyst particles under conversion conditions for cocurrent downward flow therethrough, collecting and withdrawing the treated oil from the first bed and redistributing at least a portion of the treated oil to at least one succeeding catalyst bed while permitting the gaseous phase to flow directly to the succeeding lower catalyst bed, recycling a quantity of treated oil collected below a catalyst bed and reapplying the treated oil at a preceding redistribution zone above the bed from which treated oil is collected, whereby the total of oil production flow rate and recycled treated oil flow rate is maintained at a predetermined minimum sufficient to effect uniform catalyst wetting. This technique is useful for hydrodewaxing of oils over zeolite catalysts.

Abstract: An apparatus for processing and analyzing blood serum includes an input rack for holding test tubes containing whole blood specimens and separator gel, a centrifuge, an optical sensing unit for receiving centrifuged test tubes and generating output signals indicative of whether the centrifuging was successful and, if it was, the boundary position between the separator gel and the blood serum, and a computer connected to receive and analyze the output signals of the optical sensing unit. An aspirator/dispenser needle unit is positioned above the sensing unit and is capable of lowering a needle, under the control of the computer, to puncture the stopper of a test tube and then withdraw blood serum.

Abstract: A cooling fluid is utilized to withdraw heat from a KOH treater. The passing of the cooling fluid in heat exchange with the KOH treater is controlled so as to maintain desired operating pressures for the cooling fluid and also to substantially maximize heat transfer. Bypassing of the feed around the KOH treater to prevent temperature runaway is utilized only if sufficient cooling cannot be provided by the cooling fluid to prevent temperature runaway.

Abstract: An apparatus for sterilizing packaging material is provided. The apparatus includes a container or bath for containing a liquid sterilant through which the packaging material is drawn and guided. The container having an entry opening and exit opening, and guide rollers. At least one spray nozzle located at a position above the level of liquid sterilant for spraying the packaging material with recirculated filter liquid sterilant after it has passed through the liquid sterilant bath is provided.

Abstract: A waste water treatment system for high temperature hydrolysis of cyanides has a reactor operating at a sufficiently high temperature and pressure to effect hydrolysis of cyanide in the waste waters. A heat exchanger system is provided through which reactor effluent and reactor influent streams flow. The improved waste water treatment system includes a first tube in tube heat exchanger for an influent stream and a second tube in tube heat exchanger for an effluent stream. A heat exchange medium is circulated between the effluent heat exchanger and the influent heat exchanger to cool down the effluent and in turn use the heat to heat up the influent to the reactor. The heat exchangers are arranged such that the influent and effluent streams pass through the tube side of each heat exchanger to minimize clogging of the first and second heat exchangers, while at the same time providing for effective heat exchange in cooling the effluent and heating up the waste waters to be treated.

Abstract: A scrubber module (16) of the wet type includes a partition (26) extending across the upper end of a tank (20) between the dirty flue gas inlet (28) and the clean flue gas outlet (30). The partition (26) takes the form of a plurality of hollow fingers (32), the zig-zag lower edge of which is submerged in the aqueous absorbent (22). Oxygen-containing gas such as air is introduced into the lower end of the tank (20) as the flue gas is forced underneath the partition (26) at the upper end of the tank without pre-cleaning of the flue gas to facilitate wetting and capture of the fly ash particulate as well as oxidation and absorption of the sulfur dioxide into calcium sulfate in solution, in the same vessel. A spray dryer and separator (84) is provided for removal of chloride in dry particulate form as calcium chloride before passage of the flue gas through the aqueous absorbent in the tank (20).

Abstract: An apparatus for continuously sterilizes and fills food and medicines containing solids. In this apparatus, a filler nozzle is disposed downstream of a back-pressure tank, and a control valve is interposed between the back-pressure tank and the filler nozzle for controlling the flow rate of the products which are delivered from the sterilizer to the back-pressure tank. The control valve avoids a remarkable pressure loss which might otherwise be invited in the series passages of the apparatus. The outflow of air from the back pressure tank to the filler nozzle is minimized so that the back pressure can be applied to the sterilizer as stably as possible. At the same time, the sterilized products are continuously fed to the filler nozzle so that they can be packed simultaneously with their upstream sterilization.

Abstract: The control system includes a master loop for controlling crystal interface diameter and slave control loops for controlling the melt and the crystal thermal environment. Diameter and meniscus angle signals are partitioned into both a low frequency and a high frequency signal. The low frequency signal is used to adjust the set point of the melt. The higher frequency signal is used to control the crystal pull rate. The crystal control slave loop regulates crystal heat flux which may include following a heat flux trajectory. The heat flux trajectory may also be used to adjust the melt temperature set point.

Abstract: A dispenser for and method of dispensing a concentrated cleaning solution from a solid block of a cleaning composition wherein the concentrated cleaning solution is dispensed at a substantially constant concentration during the entire useful life of the solid block of cleaning composition. The dispenser comprises (i) a spray nozzle for directing a uniform dissolving spray onto an exposed surface of the solid block of cleaning composition; and (ii) a spring or hydraulic piston coupled to the nozzle for biasing the nozzle towards the solid block and thereby maintaining a substantially constant distance between the nozzle and the exposed surface of the solid block of cleaning composition even though the exposed surface recedes due to dissolution by the dissolving spray.

Abstract: An improved high yield process and apparatus for producing sodium hydrosulfite by reacting sodium borohydride, sulfur dioxide, sodium hydroxide and sodium bisulfite is disclosed. A continuously recirculating split process stream may be used along with control of pH, temperatures, and concentration parameters to obtain sodium hydrosulfite yields in excess of 85%.

Abstract: A float controlled mechanism designed to allow the storage in and removal of variable amounts of gaseous reaction product from a reaction vessel of fixed size at a fixed pressure. The control mechanism uses a float to sense the level of the liquid in the vessel and maintain a fixed head of liquid above this level thereby maintaining a fixed pressure in the sealed reaction vessel.

Abstract: An apparatus for automatically selectively introducing successive samples of a liquid from at least one pressurized line into a receiving funnel having an outlet port and at least one inlet port. The receiving funnel has main receiving chamber for receiving liquid samples and a sensing device is also provided in the receiving funnel for sensing the level of liquid present in the receiving funnel for controlling flow in and out of the funnel.

Abstract: A method and apparatus for decomposing a sodium aluminate liquor supersaturated with alumina, obtained from alkaline action on bauxite by the Bayer process, is initiated by introduction of alumina trihydrate seed, thereby forming a suspension. The suspension is fed in at the top of a non-agitated reactor described as a "decomposer", and removed from the bottom of the decomposer; the speed at which the suspension moves downwardly is regulated at 1.5 to 10 meters per hour. The apparatus comprises a cylindrical-conical reactor which is fitted with an arrangement for feeding in the suspension at the top, and with an arrangement for taking out the suspension at the bottom. In one embodiment of the apparatus the suspension is taken from the base of the decomposer through an internal tube, with air injected into the bottom of it, is raised to the level of the top of the decomposer and is then sent downstream.

Abstract: Method for the treatment of fluidized carbon black with gases in a fluidized bed, wherein the carbon black and the treatment gases are conveyed for introduction in an unique operating procedure into the treating region in a countercurrent stream manner. The mass streams of the carbon black and the treating gases are held constant and the mass streams of the starting carbon black or the treated carbon black is regulated with the help of an optical electrical level sensor so that the height of the fluidized bed is held on a predetermined level. An apparatus is shown for the carrying out of the fluidized bed countercurrent process which has a novel carbon black product delivery system and is provided with a optical electrical level sensor means for controlling the level of the fluidized bed. The sensor comprises a hair pin shaped lighting circuit composed of two legs or rods separated by a gap.

Abstract: A continuous system, process and associated apparatus are disclosed for reacting a gas with a liquid to manufacture a gaseous or liquid product. The preferred system comprises a reactive gas, such as chlorine and an aqueous solution, such as caustic soda, which are continuously combined and reacted under largely superatmospheric pressure and in turbulent cocurrent flow in very compact reactor equipment. Liquid bleach solutions such as aqueous solutions of hypochlorites or hypochlorous acid are among the products of major interest. The main reactor equipment consists of a fluid pressure energized, in-line mixing device followed by a low slip (closely fitted) regenerative turbine pumping unit. The fluid ports in the closely fitted stator elements of said pumping unit should have a radial dimension equal to at least about half that of the vanes.

Abstract: Apparatus for removing an acidic component from a gas comprising two absorption columns for washing a crude gas by using two concentrations of alkali-containing aqueous solutions. The alkali-containing solution used in the first step has a pH of 6-13 and the solution used in the second step has a 0.3-2.5 N concentration. A specific gravity control device is used to control the concentration of the solution circulated for the second step. A pH control device is used to control the pH of the solution circulated for the first step. The pH control device controls a valve which regulates the addition of the second step solution into the tank of the first step solution as needed.

Abstract: There is disclosed a process and apparatus for forming hydrophilic polymeric solutions wherein a vessel is provided with a mixing assembly comprised of co-axially and vertically-disposed inner and outer cylindrically-shaped wall members mounted to a bottom wall member wherein the inner wall member defines a mixing chamber and is provided with orifices about a lower portion thereof to provide fluid communication to a solution chamber defined between the wall members and wherein an upper end portion of the outer wall member defines a weir to the vessel and wherein an agitator is positioned within the mixing chamber to admixed feed hydrophilic polymer and solvent in a vortex of polymeric solution contained in the mixing chamber and to cause the polymeric solution to overflow the weir into the vessel.

Abstract: An apparatus for the continuous production of clear sodium silicate solution with an SiO.sub.2 :Na.sub.2 O weight ratio of 1-2.8:1 by fusing sand in aqueous sodium hydroxide using a pressure-sealed circulating suspension reactor having an upper portion comprising a partially tapered gravity thickener and a lower portion comprising a cylindrical jet loop mixer. The jet loop mixer has a concentric cylindrical insertion tube suspended therein, and a recirculating power jet nozzle is upwardly directed through the bottom of the jet loop mixer so that its stream is directed into the lower end of the insertion tube, causing a continuous circulation flow.

Abstract: Apparatus for maintaining the level of an interface between separate phases in a solvent extraction column by regulating the flow from the base of the column. A steady controllable flow is achieved by passing the flow into a pressure vessel and the level in the vessel is controlled by having a plurality of vertically spaced apart apertures in the flow path within the vessel.

Abstract: Fluid-sampling system and method for automated, chemistry-analyzing apparatus for withdrawing precise quantities of serum samples from a specimen container and for dispensing the samples into reagent containers for analysis. The apparatus includes a sampler assembly coupled to pressure-generating means for the withdrawal and dispensing of the serum by the sampler assembly. The system is designed such that the quantity of a serum sample taken up and dispensed will be a function only of the fluid mechanics of the sampling system and the timed operation of a control valve rather than being a function of any pressure variations established in the flow control means as in prior systems. This permits infinitely variable, very small, yet very precise quantities of a serum or other fluid to be taken up and dispensed permitting more efficient and cost effective use of available serum.

Abstract: A device for the dosable addition of accurate quantities of liquid disinfecting agent to water, having a reservoir for the water, and a supply container for the disinfectant. A dosing pump feeds the disinfectant in regulatable amounts from supply container to the water flowing from the reservoir. In order to reduce constructional costs and to increase the dosing accuracy, the water reservoir has a liquid level-control device and an outlet line. The quantity of the outflowing water is controlled accurately solely by the existing static pressure of the water level in the reservoir. The fluctuation in dosing is less than 2%.