Abstract:
A device for calibrating a spray gun (10) and an associated method are provided. The spray gun (10) has a nozzle (26) that is opened and closed by moving an internal needle (42) out of and into sealing engagement with the nozzle (26). A virtual position of the needle (42) is tracked and recorded by the control system (44). The control system (44) is recalibrated when the virtual position and the actual position of the needle (42) do not correspond. The device includes a sensor (82) structured to detect characteristics of the current used to power the solenoid (38),and to identify an anomaly in solenoid (38) current characteristics associated with an actuator member seating against said solenoid.
Abstract:
A method, apparatus and system provides for accurately measuring and calibrating liquid products dispensed from a dispenser. A liquid diluent enters an aspirator assembly (12). A liquid product is drawn from a product container through a flow meter (36) into the aspirator assembly (12), wherein liquid product and diluent are mixed to dispense at the outlet of the aspirator (14). The flow meter (36) monitors the amount of liquid product drawn into and dispensed from the aspirator (14).
Abstract:
A system and related method for improved liquid delivery evaluation using a solution containing one or more dyes such that the solution exhibits multiple distinct detectable light absorbance spectral features for calibrating or testing over extended volume or dilution ranges are described. The system includes: a photometric instrument capable of measuring optical absorbance at multiple wavelengths; one or more sample solutions to be dispensed using the liquid delivery system whose performance is being tested or calibrated; and vessels optionally pre-filled, or filled by the user, with diluent solution. The sample solutions contain one or more dyes, chosen so that multiple distinct detectable light absorbance spectral features, such as peaks and/or valleys and/or plateaus of the solution can be distinguished for volume or dilution ranges of interest. The concentrations of the dyes may be chosen so that a large volume delivery device is calibrated using a spectral feature in the solution with a low absorbance per unit pathlength, while a small volume delivery device is calibrated with the same sample solution but using a different spectral feature with a high absorbance per unit pathlength.
Abstract:
L’appareil est constitué de cuves graduées d'une contenance de 20 litres (ou équivalent) chacune, montées sur chariot nivelable. (L : 140cm.-l :133cm.-h :60cm.-approx) La lecture de visée devient facile, précise et ergonomique. Les vapeurs de remplissage peuvent être recyclées. Chacune des cuves a un fond en pente d'environ 40 degrés, suivi de valve, d'un témoin goutte à goutte transparent et d'une autre valve débouchant dans un tuyau commun (en pente) se terminant par une dernière valve.
Abstract:
The invention relates to a device (1) for aspirating and dispensing liquid samples, comprising a pump (2) which comprises a cylinder chamber (3), a plunger (4) which moves in said cylinder chamber and a plunger driving system (5) which acts on said plunger. The device also comprises a pulse generator (6), which is configured to generate pressure waves in the liquid in order to cause samples of a liquid to be dispensed, and a tip (8) which is connected to the cylinder chamber (3) by a line (7). The plunger driving system (5) comprises a first driving device (9) and a second driving device (10) which is configured in the form of a pulse generator (6). The inventive device is characterised by a channel (27) that is provided for washing the cylinder chamber (3), said channel (27) opening into the cylinder chamber (3). The invention also relates to systems with e.g. 384 or more of these devices, arranged in an array.
Abstract:
The invention relates to a computer (4), a computer programme and a method for synchronising a system for receiving and/or dispensing samples of a liquid. Said system comprises a micro-dispensing device (1) and a pump (2), which are interconnected by a liquid conduit (3), said computer (4) being configured for loading a computer programme that can be activated for synchronising the micro-dispensing device (1) and pump (2). The computer (4), computer programme and method are characterised in that the computer (4) is able to control and synchronise the following functions of said system as a result of the loaded and activated computer programme: - active definition of a sample volume and dispensing of said defined sample volume using the micro-dispensing device (1) that is filled with the sample liquid; - adjusting the supply to the part (12, 12', 12'') of the pump (2) that conveys the liquid by a value that is dependent on the sample volume and is defined solely and dispensed actively by the micro-dispensing device (1), to avoid extreme differences in pressure in said micro-dispensing device (1), liquid conduit (3) and pump (2). The invention also relates to a corresponding system for carrying out said method.
Abstract:
A system (10) for accurately dispensing controlled amounts of viscous material. The system includes a pressurized supply (14) of the viscous material, a dispenser (12) connected with the pressurized supply (14) and a feedback control (26) for ensuring that a discrete dispensed amount (20) corresponds closely to the desired dispensed amount for a particular application. The different methods of feedback control include changing pressure of the pressurized supply (14) after measuring a dispensed amount (20) and comparing the dispensed amount (20) with a stored value representing the desired amount. Another manner of feedback control includes changing an air operating pessured associated with the dispenser (12). A third type of feedback control includes adjusting the duration that the dispenser (12) is maintained on to dispense the viscous material (20).
Abstract:
A device for remotely calibrating leak sensors is disclosed. The leak sensor calibration device includes a reservoir for storing a fluid calibrant, a conduit in flow communication with the reservoir, an outlet nozzle, an air supply source, and a valve mechanism. A portion of the conduit defines a dosing chamber for storing a measured quantity of the calibrant, and the outlet nozzle is in flow communication with the dosing chamber. The air supply source is adapted to pressurize the measured quantity of calibrant stored in the dosing chamber. The valve mechanism is adapted to eject the measured quantity of calibrant stored in the dosing chamber to the atmosphere through the outlet nozzle.
Abstract:
A method and apparatus for measuring and controlling the size of drops of viscous material dispensed from a dispensing system. A dispensing apparatus in accordance with embodiments of the present invention includes a housing, a dispenser that dispenses a quantity of the viscous material, a measuring apparatus having a bottom plate to receive the viscous material, a top plate that is positioned over the bottom plate after the viscous material has been dispensed, and a compressing apparatus that compresses the material between the top and bottom plates. The dispensing apparatus further includes a viewing system that views the compressed material to determine the quantity of material dispensed by the dispenser. In one embodiment, the dispensing apparatus includes a controller that controls the quantity of viscous material dispensed based on the quantity of material determined by the viewing system.