摘要:
A weighing system working on the principle of electromagnetic force compensation has two guide rods (12) which connect as parallel guides a load support (14) to a base region (11) fixed to the housing, and at least one transmission lever (17) mounted on the base region and to whose shorter lever arm the weight force transmitted by the load support is applied via a coupling element, and to whose longer lever arm is secured a coil (18) which projects into the air gap of a permanent magnet system (19). The weighing system should be narrow so that multiple weighing systems may be arranged in narrowly spaced rows next to each other. The permanent magnet system, however, should not need to be as narrow as the body of the system formed by the base region, the guide rods, the load support and the transmission lever(s). For that purpose, the permanent magnet system is broader than the body of the system and each weighing system has a recess into which the permanent magnet system(s) (29) of an adjacent weighing system (2) or of adjacent weighing systems can project. The permanent magnet system can thus be twice as broad as the body of the system.
摘要:
The invention relates to a device and a method for determining material moisture by thermogravimetry, said device comprising: a test chamber defined at the top by a chamber cover; a microwave field that can be generated by a magnetron and supplied to a test chamber by means of a waveguide; a tuning rod arranged in the test chamber; a sample carrier which is operatively connected to a weighing module mounted upstream of the test chamber; and at least one sensor arranged in the test chamber. The tuning rod is arranged centrally on the chamber cover, above the sample carrier, and at least one sensor is arranged on the free end of the tuning rod, opposing the chamber cover.
摘要:
Disclosed are a method and an apparatus for dynamically check weighing objects (18a-c) that are guided across a weight-sensitive zone (14) of a weighing device (12) at an adjustable conveying rate by means of a conveying mechanism (20a-c). At regular intervals, the weight-sensitive zone (14) supplies individual measured weight values (E1,..., En) from which resulting weight values are derived in a digital evaluation unit (16) by forming mean values. The evaluation unit (16) comprises a plurality of cascading mean value filters (24a-e) that have different filter lengths which are varied by a common scaling value in accordance with the conveying rate.
摘要:
The invention relates to measurement amplification methods and devices for detecting the detuning of a measurement bridge (10) to which a bipolar, rectangular supply voltage (Us) is supplied. The invention is characterised in that a reference voltage (Uref) used for A/D conversion undergoes polarity changes synchronised with the polarity changes of the supply voltage (Us). Offset and drift are totally eliminated by totalling an even number of individual measurements.
摘要:
Disclosed is a precision force transducer comprising a spring element (1) whose load-dependent deflection is converted into an electrical signal by means of strain gauge elements (10). The spring element (1) is made of a precipitation-hardening basic nickel alloy that has a nickel content ranging from 36 to 60 percent and a chromium content ranging from 15 to 25 percent while the strain gauge elements are composed of a polymer-free layer system, thus making it possible to produce a precision force transducer which features great accuracy, a low amount of creeping, and low sensitivity to moisture.
摘要:
The invention relates to an inclination sensor having a level which has a liquid and a gas bubble in a housing under a covering glass, wherein a light source is arranged above the covering glass. The invention is based on the object of providing an inclination sensor which can be used to determine the direction and degree of an inclination with high accuracy and which is suitable for automatic orientation of an apparatus provided with such an inclination sensor. The object is achieved according to the invention by virtue of an inclination sensor in which at least two light receivers (2.4.1, 2.4.2...2.4.4) are arranged above the covering glass (1.3) such that light (L), which is emitted by the light source (2.3) and undergoes total internal reflection at the gas bubble (4) when the gas bubble (4) is centred, can be detected by means of these at least two light receivers (2.4.1, 2.4.2...2.4.4), wherein different quantities of light can be detected by means of these light receivers (2.4.1...2.4.4) when the gas bubble (4) is not centred, and the light receivers (2.4) are arranged on a chip substrate (2.1).
摘要:
The invention relates to a weighing system that operates according to the principle of electromagnetic force compensation, comprising two connecting rods that, in the form of a parallel guide, connect a load receptor to a housing-fixed base area, and comprising a bent lever mounted on the base area. The force due to weight that is transmitted by the load receptor acts upon the short lever arm of said bent lever via a coupling element, and a coil is fastened to the long lever arm, which projects into the air gap of a permanent magnet system. The aim of the invention is to provide a weighing system of the aforementioned type that occupies only a small area. To this end, the invention provides that the long lever arm (5 ) is provided in the form of a vertical lever arm and extends, at least in part, in the area underneath the connecting rods (2, 3) of the parallel guide, and that the permanent magnet system (7) is likewise arranged underneath the connecting rods (2, 3) of the parallel guide.
摘要:
The invention relates to a method for determining the humidity and/or density of a dielectric material in a resonator that is filled with said material and that contains a transmitter and a receiver. According to said method: the transmitter emits a signal; a resonance curve of the filled resonator is scanned in stages, whereby respective signal intensity values (Ui) are measured at different frequencies (fi); the resonant frequency (frm) and the bandwidth (BWm) are determined for the filled resonator from measured points (fi/Ui); and the humidity (psi) and/or density (rho) of the material are calculated by solving a second system of equations (G2), containing the resonant frequencies (fr0, frm) and bandwidths (BW0, BWm) of the empty and filled resonators and known calibration co-efficients (a r1, a r2, b r1, b r2, c r1,c r2, a bw1, a be2, b bw1, b bw2, c bw1, c bw2) of said resonator. The aim of the invention is to provide a method for determining the humidity independently of the density in a rapid, precise manner.
摘要:
The present invention relates to a microarray assembly adopted for carrying out a chemical reaction, in particular a hybridization reaction, comprising a microporous membrane having a plurality of different analyte-specific capture molecules attached in a microarray format, said membrane being arranged in an incubation chamber, said device further comprising: a receptacle for receiving said microporous membrane, sealing means for substantially encapsulating said membrane in opposition to said receptacle, so that said membrane is urged between said receptacle and said sealing means, at least one inlet port for supplying a fluid to a first cavity adjacent to a first end of said membrane, and a second cavity arranged at a substantially opposite second end of said membrane, thereby allowing a fluid flow from said first to said second cavity through said membrane.
摘要:
Die Erfindung betrifft eine Polymermembran für eine Membran-Elektroden-Einheit in Polymer-Brennstoffzellen im Arbeitstemperaturbereich bis 250 °C sowie ein Verfahren zur Herstellung derselben. Die erfindungsgemäße, aus einem basischen Polymer bestehende Polymermembran weist aufgrund ihrer Vernetzung und ihres Gehaltes an Weichmacher(n) eine hohe mechanische Stabilität auf und ist in Membran-Elektroden-Einheiten von Polymerelektrolyt-Brennstoffzellen einsetzbar. Hierbei sind die zwei flächigen Gasverteilungselektroden, zwischen welchen die erfindungsgemäße Polymermembran angeordnet ist, mit einem Dotierungsmittel derartig beladen , dass sie ein Dotierungsmittelreservoir für die Polymermembran darstellen, wobei die Polymermembran über das Dotierungsmittel nach Einwirkung von Druck und Temperatur protonenleitend und fest an die Gasverteilungselektroden angebunden ist. Sie weist im dotierten Zustand eine Leitfähigkeit von wenigstens 0,1 S/m bei einer Temperatur von nicht weniger als 25 °C auf.