Abstract:
A method for precisely and accurately determining the volume of a test liquid aliquot which can be used to calibrate a liquid delivery device. The method is particularly useful for determining the volume of an aliquot of a test liquid which is complex or non-aqueous, or is both complex and non-aqueous. The test-stock mixture contains at least the test liquid and a stock solution including a first dye, the first dye having absorbance characteristics which are measurably distinguishable from the absorbance characteristics of a second dye. The test-stock mixture is mixed with a diluent including the second dye to form a sample solution to be used to measure absorbances of the first dye and the second dye. The volume of the test-stock mixture aliquot is calculated by using a formula based on the Beer-Lambert law which incorporates the measured absorbance values and a dilution characteristic of the test-stock mixture. The test liquid and the stock solution are combined gravimetrically in a controlled ratio so that the flow characteristics of the test-stock mixture correspond to the flow characteristics of the test liquid and without affecting the ability to distinguish the absorbance characteristics between the first dye and the second dye.
Abstract:
An apparatus for improving the procedure for quantifying the volume of liquid dispensed by a liquid-dispensing mechanism of an analytical instrument. The apparatus of this invention comprises (a) at least one weigh cup; (b) at least one standard mass; (c) at least one transducer assembly to convert a value of weight to an electrical response; and (d) at least one electronic circuit for converting the electrical response to a measurement of volume. This invention provides a method for calibrating readings of the volume of liquid dispensed by a liquid-dispensing mechanism of an analytical instruments so that absolute measurements of the volume of liquid dispensed can be obtained.
Abstract:
The invention pertains to a method of making an array of samples comprising the step of automatically dispensing a liquid with a viscosity under dispensing conditions of at least 250 mPa.s by using a positive displacement rotary piston pump. Preferably, a rotary-axial piston pump is used for automated high-throughput experimentation.
Abstract:
A calibration system includes an acoustic wave gas sensor array, and a delivery device adapted to eject a measured quantity of a liquid calibrant to the gas sensor array. The delivery device includes a connector adapted for connection to an air supply source, a reservoir adapted to store a supply of the liquid material, an outlet arranged for placement adajacent to the gas sensor array, a dosing chamber sized to define and store a measured quantity of the calibrant, a conduit disposed between the dosing chamber and the reservoir and arranged to provide flow communication therebetween, a portion of the conduit arranged to be responsive to a pressure gradient within the dosing chamber over a predetermined time interval to thereby prevent flow from the dosing chamber toward the reservoir during the predetermined time period, and a valve mechanism adapted to apply the pressure gradient to the dosing chamber over the predetermined time interval.
Abstract:
The invention relates to a device (1) for dispensing or aspirating/dispensing liquid samples, comprising a pump (2) and a micro-ejection device (3), said micro-ejection device (3) having a pulse generator (4) with a chamber (5). Said pulse generator (4) is used to produce pressure waves in the liquid in order to cause the samples of a liquid to be dispensed. The micro-ejection device (3) also comprises an end piece (6) and a liquid line (7) which connects the pulse generator (4) to the end piece (6). The pulse generator comprises a micro-actuator (10) which is configured to function in the same direction as that in which the pressure wave leaves the chamber (5). The inventive devices are characterised in that the chamber (5), in the area of the end facing away from the end piece (6), or the corresponding connecting element (14) has a narrowed section (16) which restricts any expansion of the pressure waves in the direction of the pump (2). The invention also relates to systems with multiple devices of this type.
Abstract:
A batch delivery system that provides material overfill compensation to deliver a precise amount of material from a source to a destination. The system can also detect possible malfunction of a flow control means such as a valve or a pump.
Abstract:
Vision system for measurement of a pitch of graduated marks on a syringe. The vision system may utilize a frequency domain representation of image data to measure the pitch. Furthermore, data processing techniques such as interpolation, windowing, and/or calibration may be utilized in connection with the measurement. In turn, the pitch of the graduated marks may be used in connection with automated filing of the syringe such that the syringe is filled based on and according to the graduated marks on the syringe.
Abstract:
Es wird eine Tropfendetektionseinrichtung (11, 11a) zur Detektion von aus einem Dosierventil (DV) austretenden, sich entlang einer Trajektorie bewegenden Tropfen (TR) beschrieben. Die Tropfendetektionseinrichtung (11, 11a) umfasst eine Lichtwellenleiteranordnung (L) mit einem ersten Lichtwellenleiter (L1) und einem zweiten Lichtwellenleiter (L2). Der erste Lichtwellenleiter (L1) und der zweite Lichtwellenleiter (L2) sind einander gegenüberliegend an einem Zwischenraum, durch den die Trajektorie des Tropfens (TR) verläuft, derart angeordnet, dass ein von dem ersten Lichtwellenleiter (L1) ausgesandter Lichtstrahl (LS) die Trajektorie(T)des Tropfens (TR) kreuzt und anschließend in den zweiten Lichtwellenleiter (L2) eingekoppelt wird. Zudem umfasst die Tropfendetektionseinrichtung (11, 11a) eine Lichtsignalerzeugungseinrichtung (70), um einenmit einer Trägerfrequenz gepulsten Lichtstrahl (LS) in den ersten Lichtwellenleiter (L1) einzukoppeln. Darüber hinaus weist die Tropfendetektionseinrichtung (11, 11a) aucheine Lichtauswertungseinrichtung (80) aus, um den in den zweiten Lichtwellenleiter (L2) eingekoppelten Lichtstrahl (LS) auszuwerten, um zu ermitteln,ob ein Tropfen (TR) von dem Dosierventil (DV) abgegeben wurde. Es wird auch ein Verfahren (500) zum Detektieren eines Tropfens (TR) beschrieben.
Abstract:
In present invention, the correctness of the quantity of fuel flowing into the engine through fuel pump is determined by a 'load cell' in which the weight of the fuel is sensed by an electronic sensor, processed by a specially designed processing unit called analyzer and displayed as output on a screen using Bluetooth with option for taking printout also. The system is easy to use, cost- effective and accurate. A major advantage offered by the system over prior art systems is that it does not use flow sensors or graduated glass tubes. It is very compact thus portability is easy. It can be easily plugged into existing diesel fuel pump test benches or can be supplied as additional accessory for use in existing machines or as an integrated module with new machines.
Abstract:
A method is provided for determining a discharge coefficient of a managed pressure drilling choke/valve as a function of valve opening position. The method comprises: a flow of air/gas through the choke/valve; measuring a velocity of the air/gas flow at an inlet of the choke/valve; and measuring a pressure drop of the air/gas flow across the choke/valve.