Abstract:
Due to the size of the devices used for the excitation and measuring of light, conventional sensor elements for optically determining the concentrations of substances contained in gaseous and liquid samples, featuring an indicator layer with one or more indicator substances, are not well suited for use with microanalysis equipment, nor are they easy to mass-produce. These disadvantages are eliminated by using a unitary sensor element having a carrier layer, at least one photosensitive element with electric contact leads in contact with the carrier layer, and an indicator layer containing an indicator substance.
Abstract:
In a sensor element for determining the O.sub.2 content of a sample, comprising a fluorescent indicator substance which is embedded in a polymer carrier and with which the sample may be brought into contact, a fluorescence extinction sufficiently high for yielding useful measurement results is achieved by the use of plasticizer-compatible polymers as carrier materials which contain plasticizers in addition to the indicator molecules.
Abstract:
Between a substance to be analyzed and a sensor there is placed at least one membrane, forming part of a sample vessel containing a sample to be analyzed and being permeable for a species depending on the substance to be analyzed. This membrane constitutes at least one wall of the sample vessel, through which the active sensor surface may be brought into contact with the substance to be analyzed. The sensor is designed as a separate unit which is movable relative to the sample vessel, with which its membrane may be brought into contact. For the purpose of measurement the sensor is contacted by the membrane stretching over the active sensor surface which in itself does not carry a membrane.In this way the sensor cannot be contaminated by the sample, and the device may be successfully used for series measurements.
Abstract:
An analyzing apparatus for the purpose of analyzing samples of body fluids, comprising a sample feeding device and a measuring channel in which measuring probes are contained. In order to attain good reproducibility and uniform conditions of treatment of the samples the measuring channel is separated by means of a valve from a storage tank communicating with the sample feeding device.
Abstract:
Due to the size of the devices used for the excitation and measuring of light, conventional sensor elements for optically determining the concentrations of substances contained in gaseous and liquid samples, featuring an indicator layer with one or more indicator substances, are not well suited for use with microanalysis equipment, nor are they easy to mass-produce. These disadvantages are eliminated by integrating on the carrier layer (1) at least one photosensitive element (3) and its electric contact leads in planar arrangement, and by establishing optical contact between the indicator substance (7, 7') of the indicator layer (6) stimulated by the excitation radiation (11), and the photosensitive elements (3).
Abstract:
In order to reduce the measuring volume in a device for measuring chemical and physical parameters of liquid or gaseous media by means of optical sensor elements whose optodes may be replaced easily, a measuring unit with a sample channel is provided which may be inserted into a supporting frame of the device and which may be connected to ingoing and outgoing sample lines via capillary bores. The measuring unit contains a sensor carrier forming the boundary of the sample channel on one side, which sensor carrier has bores holding the optodes. The indicator film of each individual optode is situated in the plane of the sensor carrier facing the sample channel.
Abstract:
In order to improve a one-way measuring element, which may be inserted into an analyzer for analyzing gaseous or liquid samples and which comprises a measuring channel with a measuring zone and one or more sensors located therein, the proposal is put forward that the one-way measuring element be provided with a sensor part whose measuring channel has seals on both ends, and with a sample-taking part, and that a coupling element be placed at the inlet end of the measuring channel for direct coupling of the sample-taking part containing the gaseous or liquid sample, and that the measuring channel be filled with a calibrating and storage medium prior to the measuring process, and that the calibrating and storage medium contained in the measuring channel be displaced by the sample flowing in after the sample-taking part has been coupled to the sensor part. The one-way measuring elements obtained in this way are characterized by great simplicity of design and ease of handling.
Abstract:
In conventional devices for feeding an analyzing apparatus with different media, comprising a feeder unit with fittings for the media to be introduced, the individual media travel different paths between the input opening and the measuring chambers, which will result in different conditions of measurement for calibrating media and sample media. The invention eliminates this drawback by providing the feeder unit 1 with input elements 6, by placing the sample input opening 4 on a supporting piece 3 which may be moved by a control unit 17, and by providing that each input element 6 may be brought into sealing contact with the sample input opening 4 subsequent to a rotatory motion of the supporting piece 3.
Abstract:
In conventional devices for feeding an analysing apparatus with different media, comprising a feeder unit with fittings for the media to be introduced, the individual media travel different paths between the inlet opening and the measuring chambers, which will result in different conditions of measurement for calibrating media and sample media. The invention eliminates this drawback by providing the feeder unit (1) with feed elements (4, 4') connected with the fittings (5), and by enabling each feed element (4, 4') to be positioned above the sample inlet opening (10) by means of a control unit (8) effecting a translational or rotatory motion of the feeder unit (1), subsequent to which the feed element (4, 4') can be inserted into the sample inlet opening (10) by means of a lifting device acting parallel to the center axis (11) of the sample inlet opening (10).
Abstract:
Method for making an electrode having an axial capillary bore with an intersecting bore. An extensible tube is inserted in the axial bore and a polymerizable mixture is inserted in the intersecting bore and permitted to polymerize against the tube which is stretched to facilitate removal of the tube. The tube is selected to swell under the action of the solvent and the tube is filled with solvent.