Abstract: A test device (10) for filter systems comprising at least two test units (14), a management unit (12) for managing and controlling the at least two test units (14), and signal links via a bi-directional or multi-directional network (16) between the management unit (12) and the at least two test units (14), particularly for transmitting test program instructions and test results. The invention further relates to a method for testing filter systems and a computer readable storage device with a computer program stored therein for testing filter systems.

Abstract: A balance including a weighing pan (2; 32), a weigh sensor (8; 38) with a housing (1; 31) enclosing the weigh sensor, and an antenna (7; 37) configured to communicate with a transponder (4) that is, e.g., associated with or attached to an object being weighed (3). The antenna (7; 37) is arranged in a horizontal plane in or below the weighing pan (2; 32) and the weighing pan is preferably made of an electrically poorly conductive material. As a result, the antenna is almost invisibly integrated in the balance and does not interfere with the placement of the objects being weighed on the balance.

Abstract: A monodirectional or bi-directional distributor plate for crossflow cassette-type filtration appliances is provided which comprises three parts and is used in the ultrafiltration or microfiltration of liquids. The three-part distributor plate assembly comprises a middle plate member, an upper plate member and a lower plate member, which when combined has a front and rear surface, a first and second side wall and a first and second edge wall. The front and rear surfaces of the distributor plate assembly are provided with feed, residue and filtrate orifices arranged to communicate with feed, residue and filtrate orifices of a plurality of filter cassettes. Due to the manner of flow to and/or from associated filter cassettes by way of the three-part distributor plate assembly, equal pressure can be achieved at all orifices to ensure equal flow over a filter membrane surface increasing filtration performance.

Abstract: The abstract discloses a method for preparing supports for the assay of chemical or biological substances, consisting in preparing N different supports, each being homogeneous for a type of reaction, then in mutually combining, according to a predetermined arrangement, all or part of the said homogenous N supports to constitute assay supports having each an ordered set of reaction zones of N different types or less. The invention also concerns the assay supports prepared by this method and their use in processes of immunological hybridisation assays.

Abstract: Membrane filters for the collection and detection of air-borne microorganisms are made from gelatin treated with an osmoprotective agent and exhibit the capacity to at least double the number of viable bacteria captured in a given sample relative to conventional gelatin membrane filters.

Abstract: An internally plumbed housing for containing fluid purification media especially suitable for the production of ultrapure water. The device may be installed in a system for the production of laboratory grade water or may be used with pressurized feed for the delivery of purified water or other fluids in multiple applications.

Abstract: A multiple fluid filter apparatus is disclosed having a locking arrangement for securing multiple filter elements that accommodates different size filters, permits axial expansion and contraction of the filters, yet prevents warping.

Abstract: The invention relates to improved cross-flow filter cassettes for the filtration of liquid media, which are used in cross-flow filtration devices of varying pump outputs and can be fitted with non-reinforced membranes. The cassettes comprise at least one retentate separator in which the inlets to the open perforations designed to form one type of channel, for example for retentate discharge, are larger than the inlets to the open perforations designed to form another type of channel, for example for fluid feed. In comparison with known cross-flow filter cassettes, the cross-flow filter cassettes of the invention allow retentate flows required to achieve equal filtration output at equal pressure differential on the retentate side at least 1.8 times lower. This significantly reduces the energy input required for pumping to conduct cross-flow filtration.

Abstract: In a weight sensor operating according to the principle of electromagnetic force compensation, the essential parts are fabricated from a single block of material. The weight sensor has a load receiver (10), which is connected through an upper guide (12) and a lower (11) guide to the housing-integral base body (1) of the material block. The weight sensor also has several force-reduction translating levers (21,22; 24, 25,25′; 27,27′,28) and coupling elements (18,18′, 23, 26,26′) between the translating levers (21, 22; 24 ,25,25′; 27,27′,28). The housing-integral base body (1) projects in the direction of the load receiver (10), extends into the space between the two guides (11, 12) and forms a support point for the first translating lever (21, 22). The weight sensor is equipped with a coil (34), which is fastened at the longer lever arm (28) of the last translating lever (27,27′,28,29,29′) and is situated in the magnetic field of a permanent magnet.

Abstract: An improvement to a spiral wound filtration membrane is the provision of a fluid-permeable protective sheath around the inner spacer of the membrane pocket.

Abstract: An electronic weighing sensor (10) having a digital signal processing unit (19), which includes at least one filter (12) with low-pass characteristic. By means of the filter (12), the direct-current component (m) is determined from the output signal of the weighing sensor and the weighing result is derived therefrom. A signal, which is dependent on the amplitude of the vibrations, is determined by the digital signal processing unit (19) and electronic components (18) change the direct-current component (m) as a function of the magnitude of the vibration-dependent signal. This significantly improves the performance of the weighing sensor (10) with respect to shocks and vibrations in the installation site of the weighing sensor (10).

Abstract: In a drying balance with a balance pan (3) which rests removably on the load receiver (2) of a weighing system, a radiation source (19) for warming and drying a substance on the balance pan (3), and a temperature calibrating disk (4) with at least one built-in temperature sensor (11; 21), the load receiver (2) has a vertical hole (7) into which a pin (6) on the underside of the balance pan (3) protrudes. The housing (1) of the balance has an opening (5) around the hole (7) in the load receiver (2) which is significantly larger than the diameter of the pin (6). The temperature calibrating disk (4) has a plug (8) on its underside with several contacts (9) on the outer edge, which protrudes into the opening (5) without contacting the load receiver (2). The plug (8) establishes an electrical connection with the corresponding mating contacts (10) at the opening (5). The plug (8) has three contacts (9) which are held in a synthetic material part.

Abstract: A filtration cell for carrying out a tangential flow filtration of a sample liquid contains at least two blocks and at least two filtration elements arranged between each pair of two adjacent blocks. The filtration elements each include an outlet for filtrate, a sheet of support material and two generally flat ultrafiltration or microfiltration membranes, arranged on either side of the support material in a sandwich construction. Each of the blocks, at a side adjacent the membranes, is provided with a respective channel for feeding a flow of sample liquid tangentially over the membranes such that each channel is connected in parallel with the inlet for the flow of sample liquid to be filtered and with an outlet for a concentrated solution. Each channel includes in its longitudinal direction a number of subsequent channel sections separated by transitional zones and is constructed and arranged such that the main flow direction in subsequent sections changes abruptly in the transitional zones.

Abstract: Supported separation membranes are disclosed wherein the permselective membrane is integral with a polymeric support of non-woven fibers having a particular air permeability, the integral membranes exhibiting far superior lifetimes and retention capability, especially for microorganisms.

Abstract: An adsorptive separation device is disclosed having at least one spiral wound adsorption membrane situated around the periphery of a core mandrel wherein the flow is radial from a feed plenum situated between the core mandrel and the membrane, through the membrane to a permeate plenum located between the membrane and a housing for both the core mandrel and the spiral wound membrane. An array of such separation devices is also disclosed showing connections in parallel, in series, in both parallel and in series and in tandem.

Abstract: Adsorptive separation is performed on liquid media by directing the media containing a target substance through an adsorber stage A whereby the target substance is adsorbed; in the last phase of loading stage A and prior to breakthrough of the target substance in the stage A permeate, the stage A permeate is directed to a second adsorber stage B. Upon completion of the stage A loading, the target substance from stage A is eluted with buffer solution, which buffer solution is introduced to stage B, and liquid medium is directed to the preloaded stage A, while stage A is eluted so as both recover the target substance and regenerate the adsorptive capacity of stage A.

Abstract: Devices suitable for adsorptive separation, filtration or catalytic conversion of liquid media are disclosed that have ideal dimensions for efficient performance. A method for dimensioning such devices is also disclosed.