Abstract: The invention relates to a probe device for measuring the concentration of at least one volatile component in an aqueous solution, in particular for measuring the concentration of ethanol, the device having a probe body with an opening, which is tightly covered by a flat membrane, wherein the membrane is permeable for the volatile component, and a sensor for measuring the concentration of the volatile component, wherein the sensor is located inside the probe body and has a sensitive surface, which is located in a first measuring space, wherein an inner side of the flat membrane is part of a second measuring space, wherein the first measuring space and the second measuring space are connected by a measuring aperture, and wherein the first measuring space is connected to a carrier gas exhaust and the second measuring space is connected to a carrier gas supply.

Abstract: The invention relates to a probe device for measuring the concentration of at least one volatile component in an aqueous solution, in particular for measuring the concentration of ethanol, the device having a probe body with an opening, which is tightly covered by a flat membrane, wherein the membrane is permeable for the volatile component, and a sensor for measuring the concentration of the volatile component, wherein the sensor is located inside the probe body and has a sensitive surface, which is located in a first measuring space, wherein an inner side of the flat membrane is part of a second measuring space, wherein the first measuring space and the second measuring space are connected by a measuring aperture, and wherein the first measuring space is connected to a carrier gas exhaust and the second measuring space is connected to a carrier gas supply.

Abstract: A probe (1) for quantitatively measuring volatile components of a liquid (2) includes a measurement gas space (3) separated from the liquid (4) by a permeation membrane (5). The membrane (5) is permeable for the volatile component, however nonpermeable for liquid. A selective gas detection system is arranged in the measurement gas space (3) for a defined volatile component. The gas detection system has an IR light source (6), an IR filter (7), (7′) and an IR-sensitive light sensor (8), (8′). Light falls through the IR filter on the light sensor (8), (8′). The IR filter (7), (7′) comprises a transmission window in the range of an alcohol-specific absorption band.

Abstract: A sensor (1) for measuring O2 concentrations in liquids (2) has a working electrode (3), with a counterelectrode (4) and with a reference electrode (5), wherein the working electrode (3) and the counterelectrode (4) are in contact with the liquid (2). The reference electrode (5) is separated from the liquid (2) by a diaphragm (6). The reference electrode (5) measures a polarization voltage effectively acting at the working electrode (3) and is connected to a potentiostat regulating the potential between the working electrode (3) and the counterelectrode (4). The reference electrode (5), the working electrode (3) and the counterelectrode (4) are arranged coaxially to one another, wherein the working electrode (3) and the counterelectrode (4) are arranged around the reference electrode (5).

Abstract: A probe (1) for quantitatively measuring volatile components of a liquid (2) includes a measurement gas space (3) separated from the liquid (4) by a permeation membrane (5). The membrane (5) is permeable for the volatile component, however nonpermeable for liquid. A selective gas detection system is arranged in the measurement gas space (3) for a defined volatile component. The gas detection system has an IR light source (6), an IR filter (7), (7′) and an IR-sensitive light sensor (8), (8′). Light falls through the IR filter on the light sensor (8), (8′). The IR filter (7), (7′) comprises a transmission window in the range of an alcohol-specific absorption band.

Abstract: The invention relates to a probe device for determining the concentration of highly volatile components in liquids and/or gases, with a probe body (1) comprising a probe core (2) and a probe finger (3) being permeable for the highly volatile components, in the area of probe core (2) or of probe finger (3) a sensor (4) for the highly volatile components being provided, and comprising a protective tube (5) enclosing probe finger (3) and having passage openings (7). The invention teaches that protective tube (5) is configured as a piston (5) of a sluice device (6) having a measuring position and a servicing position of piston (5), and that passage openings (7) of piston (5) are disposed such that piston (5) has in addition the function of a slider valve sleeve, with probe finger (3) being connected over passage openings (7) in the measuring position to a measuring space (8) and in the servicing position to a servicing space (9) separated from measuring space (8).

Abstract: A sensor (1) for measuring O2 concentrations in liquids (2) has a working electrode (3), with a counterelectrode (4) and with a reference electrode (5), wherein the working electrode (3) and the counterelectrode (4) are in contact with the liquid (2). The reference electrode (5) is separated from the liquid (2) by a diaphragm (6). The reference electrode (5) measures a polarization voltage effectively acting at the working electrode (3) and is connected to a potentiostat regulating the potential between the working electrode (3) and the counterelectrode (4). The reference electrode (5), the working electrode (3) and the counterelectrode (4) are arranged coaxially to one another, wherein the working electrode (3) and the counterelectrode (4) are arranged around the reference electrode (5).

Abstract: The invention relates to a probe device for determining the concentration of highly volatile components in liquids and/or gases, with a probe body (1) comprising a probe core (2) and a probe finger (3) being permeable for the highly volatile components, in the area of probe core (2) or of probe finger (3) a sensor (4) for the highly volatile tube (5) enclosing probe finger (3) and having passage openings (7). The invention teaches that protective tube (5) is configured as a piston (5) of a sluice device (6) having a measuring position and a servicing position of piston (5), and that passage openings (7) of piston (5 ) are disposed such that piston (5) has in addition the function of a slider valve sleeve, with probe finger (3) being connected over passage openings (7) in the measuring position to a measuring space (8) and in the servicing position to a servicing space (9) separated from measuring space (8).

Abstract: A probe for the determination of the concentrations of volatile components in liquids or gases comprises a probe body consisting of two essentially tubular, coaxial parts which are disposed one within the other. The external part carries in its front zone a permeation canal, formed by a thread, and covered by a tubular permeation membrane. A protective sleeve surrounds and is spaced from that membrane. At its front end, the external part is closed by a plug-like closing member which defines a holding space for a gas sensor or for an adapter connected with an external measuring instrument. A carrier medium is fed to the permeation canal via a ring-shaped carrier-medium feed canal between the external and internal body parts and the carrier medium is returned via a return line disposed inside the probe body. In the zone of attachment to a connection piece, the external part carries an O-ring and the outside of the screwed-on protective sleeve is aligned with the outside of the mounting zone.

Abstract: A device for measuring volatile constituents of a culture medium in the fermentation industry, comprising a probe, which has a permeable membrane to exchange material for a carrier medium, and a sensor responding to the content of the substance to be measured which has permeated into the carrier medium. In order that the device may be used in industrial fermenters and in order to achieve a high degree of accuracy in measurement and reproducibility of the measured values, both the permeable membrane and the sensor are disposed in the space in which the culture medium to be tested is situated, the probe being introduced into the space containing the culture medium where appropriate by way of a lock.