Abstract: A gravimetric measuring device includes a weighing chamber with a vertical weighing chamber wall, which is formed as a support structure (14) with cover modules (28) detachably fixed thereto on the weighing chamber side, each cover module (28) having, on its weighing chamber side, a module front wall (30) covering the support structure (14) at least partially. The cover modules (28) have locking cantilevers (38) directed towards the support structure such that the locking cantilevers (38) are provided with vertically directed through-openings (40) which are aligned with corresponding through-openings (20, 22) of the support structure (14). The cover modules (28) are locked to the support structure (14) with locking rods (42) which pass through the mutually aligned through-openings (40; 20, 22) of the cover modules (28) and the support structure (14).

Abstract: A gravimetric measuring system (10) includes a balance (12) with a weighing chamber (22) surrounded by a plurality of weighing chamber walls (23, 24, 26, 28); an electromechanical weighing system (181) enclosed by an adjoining weighing system chamber (18); and an electronic control apparatus (36) for controlling the system operation according to algorithms stored in a memory (363) of the control apparatus. A plurality of functional modules (14, 16) that generate heat during operation are insertable into module receptacles (283) arranged on at least one weighing chamber wall (28). A plurality of interacting measures, such as providing the module receptacles with device-side identification and thermal interface components and the functional modules with module-side identification and thermal interface components that interact, lead to a controllable measuring system that is flexibly equipped and calibratable.

Abstract: A gravimetric measuring system (10) includes a balance (12) with a weighing chamber (22) surrounded by a weighing chamber wall (23, 24, 26, 28); an electromechanical weighing system (181) arranged in a weighing system chamber (18); an electronic control apparatus (36) for controlling the system operation; a cooling apparatus (34), controllable by the control apparatus, for cooling the weighing chamber (22); and a plurality of functional modules (14, 16) that generate heat during operation and are insertable into module receptacles (283) arranged on the weighing chamber wall (28).

Abstract: A gravimetric measuring system (10), includes a balance (12) with a weighing chamber (22) surrounded by a weighing chamber wall (23, 24, 26, 28); an electromechanical weighing system (181); an electronic control apparatus (36) for controlling the system operation according to algorithms stored in a memory (363) thereof; and a plurality of functional modules (14, 16) configured to be inserted into module receptacles (283) arranged on the weighing chamber wall (28). Each module receptacle (283) has a device-side identification interface component (30a); and each functional module has a corresponding module-side identification interface component (30b). The control apparatus (36) identifies each functional module (14, 16) inserted into a module receptacle (283), through interaction between the respective device-side and module-side identification interface components (30a, 30b) and selects one of a plurality of operating routines according to algorithms stored in the memory.

Abstract: A monolithic weighing system (100) includes a plurality of levers (120), which are joined together by thin-section joints (110). The levers, on the one hand, and the thin-section joints, on the other hand, are made of different materials or material combinations; and the levers, adjoining one of the thin-section joints on both sides thereof, have a first material (21), and the thin-section joint has a second material (22) which is different from the first material. An associated method includes (i) an additive manufacturing process, in which different materials, including the first and second material (21, 22), are applied in layers and are joined to form a single-piece weighing system blank (10), wherein the weighing system blank (10) has prospective lever regions (12) and prospective thin-section joint regions (11), and (ii) subsequent subtractive finishing of the weighing system blank at least on the prospective thin-section joint regions to obtain the weighing system.

Abstract: A gravimetric measuring system (10) includes a balance (12) with a weighing chamber (22), surrounded by a plurality of weighing chamber walls (23, 24, 26, 28); an electromechanical weighing system (181); and an electronic control apparatus (36) controlling the system operation according to routines stored in a memory (363) thereof; and a plurality of functional modules (14, 16), configured to be inserted into module receptacles, arranged on at least one weighing chamber wall (28). The at least one weighing chamber wall (28) is designed as a carrier structure, with recesses (283) which constitute clearances occupying a majority of the wall surface and which form the module receptacles. Either the functional modules (14, 16) or diaphragms (15) without a weighing function close the recesses and are spatially adapted to the recesses.

Abstract: A pot magnet (20) for a moving coil (10) of an electronic balance operating using the electromagnetic compensation principle includes: —a pot base (24) and a pot wall (22) rising vertically from the pot base, and —a permanent magnet structure (26) disposed within the pot wall and having an annular gap thereto, which structure has a permanent magnet body (261) arranged on the pot base side and a pole plate (262) connected to the surface thereof facing away from the pot base side. The pole plate is fixed by a rigid mechanical connection independent of the permanent magnet body to the pot base at a predetermined distance therefrom and the permanent magnet body is bonded to the pole plate on a surface facing the pot base without contacting the pot base.

Abstract: The invention relates to methods of purifying viral vectors from cell culture. In particular, the invention relates to a method of purifying a supernatant containing viral vectors from a cell culture by removing cells by filtering the cell culture using diatomaceous earth.

Abstract: A positioning foot having a hydraulic shock absorber with a fluid-filled hollow cylinder (210), in which a piston (220) that moves axially between an advanced, spring prestressed position and a retracted position. The piston separates a front axial fluid space (214) and a rear axial fluid space (215) from one another in the hollow cylinder. Both fluid spaces are connected to one another in a fluid exchanging fashion via at least one throttle opening (223) in the piston. The piston is rigidly connected to a piston rod (221), which passes through the front fluid space and abuts a fixed stop (218) in the retracted position, in which the volume of the rear axial fluid space is minimized and the volume of the front axial fluid space is maximized. The spring prestress is dimensioned so that the weight of the device body moves the piston dampingly into the retracted position.

Abstract: A purification device for water has a housing with a longitudinal axis, an upper and a lower end and a substantially round cross section. The device includes a first receptacle, arranged parallel to the longitudinal axis of the housing, for a first purification medium, and a second receptacle, which is also arranged parallel to the longitudinal axis of the housing, for a second purification medium. The receptacle for the second purification medium is arranged eccentrically with respect to the longitudinal axis of the housing.

Abstract: A distributor head for a suction pump which includes a housing (12), a pump port (16) configured to apply a negative pressure, and a plurality of hollow needles (18). The hollow needles are fixed to the housing (12), are connected in a liquid-tight manner to the pump port (16), and are arranged parallel to and at a distance from one another. Individual connecting paths (34) of the hollow needles (18) to the pump port (16) include respective, independently operable control valves (36).

Abstract: A precision balance including a weighing chamber (16); a draft shield (18, 20, 22), which surrounds the weighing chamber (16); a climate module (34), which is detachably disposed in the weighing chamber (16); a processor (32) and a data input unit, which both form part of the overall precision balance; and a data transmission path, over which data is exchanged between the climate module (34) and the processor (32). Also disclosed is a climate module for a precision balance. The climate module (34) forms a self-contained modular unit and includes an air pressure sensor (62), an air humidity sensor (54) and an air temperature sensor (52) The climate module also includes a data transmission path configured to transmit data to a processor external to the climate module, and a mounting mechanism configured to secure the climate module detachably to a weighing module (10).

Abstract: A weighing apparatus includes —a sample holder (20), —a protective housing (14, 16, 18) with an access port (181) and a closure element (26), —a reflection sensor (34) with a radiation emitter (37) emitting sensor radiation (38) reflected by a reflecting object (39) and with a radiation receiver (42) receiving a sensor radiation component (40), reflected by the object and —a control unit (32), connected to a motorized drive (30) of the closure element and to the reflection sensor, and which controls the motorized drive with a reflection sensor signal, for transferring the closure element between closed and open positions. A differentiating element subjects a sensor primary signal (52) of the reflection sensor to a differentiation. The primary signal depends on a reflection intensity of the reflected radiation component and generates a sensor secondary signal (60). The control unit controls the motorized drive based on the sign of the secondary signal.

Abstract: A connecting structure connects a filter housing to a filter housing retaining structure. The connecting structure conducts a liquid that is to be cleaned to the filter housing and discharges a purified liquid. The connecting structure includes a filter housing cover that connects to the filter housing and that receives a filter medium. The filter housing cover has attachment elements that connect to corresponding attachment elements of the filter housing retaining structure to establish an exchange of fluids between the filter housing retaining structure and the filter housing. Filter housing cover guides are on opposing sides of the filter housing cover; and guides on the filter housing retaining structure engage the filter housing cover guides when connecting the attachment elements of the filter housing cover with the attachment elements of the filter housing retaining structure to support and linearly guide the filter housing cover during the connection process.

Abstract: A dosing device with a balance, which includes a weighing chamber (16); a processor (32); a climate module (34), which is disposed in the weighing chamber (16); a data transmission path, over which data is exchanged between the climate module (34) and the processor (32); and a mixing formulation display (30). Also disclosed are a climate module configured to electrically couple to a dosing device in a detachable manner, wherein the climate module (34) forms a self-contained modular unit and includes various sensors (52, 54, 62) and a path over which data is transmitted to a processor external to the climate module, and a method for mixing a formulation, using a dosing device, wherein ambient conditions are detected during dosage of the substances to be combined, and the mixing ratio is adjusted in accordance with the detected ambient conditions.

Abstract: A cover (24) of a draft shield (12) of a precision balance (10), has a support frame (36) on which holding elements (40) and/or guide rails (38) are provided for a front panel (18) and/or at least one side panel (26), and a cover element (54) which is pivotable, about a bearing (60) provided at one edge, between a holding position and a releasing position. At the edge positioned opposite the bearing are holding elements (72, 74) which fix the cover element at the opposite edge of the support frame, wherein the holding elements can be released by displacing at least one portion of the cover element in the direction toward the bearing.

Abstract: A measuring instrument for thermogravimetrically determining the moisture content of a material, which includes a base (12), configured as a balance, with a base surface (22), and a hood (14) pivotably connected to the base. The hood has a weighing chamber lid (50), weighing chamber walls (52-56) and a heating element (44). The hood consists of an electronics module (36) that includes the heating element and an electronic power unit, and of a mechanical module (48) that includes the weighing chamber lid and all of the weighing chamber walls. The mechanical module (48) is rigidly and reversibly coupled to the electronics module so that the heating element, protrudes from a main body (42) of the electronics module and rises through a corresponding opening (58) in the rearward weighing chamber wall (56), with the main body being pivotably connected to the base and surrounding the electronic power unit.

Abstract: A balance including a weighing chamber (16); a draft shield (23), which surrounds the weighing chamber; a climate module (34), which is detachably disposed in the weighing chamber; a processor (32), which is programmed to provide an evaporation rate correction value; a data input unit; and a data transmission path, over which data is exchanged between the climate module and the processor. Also disclosed are a climate module configured to electrically yet detachably couple to a balance, wherein the climate module forms a self-contained modular unit and includes various sensors (52, 54, 62) and a path over which data is transmitted to an external processor, and to a method for calibrating a pipette using a balance, wherein an evaporation rate is determined during the calibration process, and the measurement is corrected in accordance with the determined evaporation rate.

Abstract: A method and apparatus for operating an electro-deionization (EDI) module produces purified water using a power supply controller to provide more efficient and accurate operation.

Abstract: A weighing chamber base (34) for a precision balance (10) has a weighing base section (98) and two side cheeks (100), which extend perpendicularly from the weighing base section, and which are arranged on opposite edges (102) of the weighing base section outside the draft shield (12). Also, a draft shield (12) that has such a weighing chamber base (34), and has at least one side panel (26), which can be moved between an open position and a closed position. The side cheeks of the weighing chamber base form a section of the side walls (22) of the draft shield (12).