Abstract:
Die vorliegende Erfindung betrifft eine Strahlungsquelle (1) für eine radiometrische Messanordnung (100) mit einer in einem Strahlenschutzbehälter (2) angeordneten radioaktiven Quelle, wobei die Strahlenquelle eine mittels eines Verschlusses ver- schließbare Blende (9) aufweist und wobei der Verschluss (7) mittels eines Aktors (11) betätigbar ist, indem die Strahlungsquelle (1) wenigstens ein Funkmodul (13) zur Aktivierung des Aktors (11) aufweist.
Abstract:
Befestigungsvorrichtung für einen Sensor, eingerichtet zur Befestigung des Sensors an einem Behälter, aufweisend eine erste mechanische Schnittstelle und eine zweite mechanische Schnittstelle, zur Befestigung der Befestigungsvorrichtung an verschiedenen Prozessanschlüssen.
Abstract:
A radiation measurement apparatus for use in a nucleonic level or density gauge is disclosed. The measurement apparatus comprises a radiation detector and a control unit configured to receive radiation measurements from the radiation detector. The control unit is configured to calculate an exponential moving average over time with a first time constant and a linear moving average over time with a second time constant. The second time constant is smaller than the first time constant. The control unit is configured to select either the exponential moving average or the linear moving average to use in determining a level or density based on the criterion that if the linear moving average differs from the exponential moving average by more than a pre-determined threshold the linear moving average is used and, if not, the exponential moving average is used.
Abstract:
Process for separating polymeric and gaseous components of a reaction mixture obtained by high-pressure polymerization of ethylenically unsaturated monomers in the presence of free-radical polymerization initiators, the process comprising the steps of entering the reaction mixture into a separation vessel; separating the reaction mixture into in a gaseous fraction and a liquid fraction; and withdrawing the gaseous fraction from the top of the separation vessel and withdrawing the liquid fraction from the bottom of the separation vessel, wherein the separation is carried out at a pressure of from 15 MPa to 50 MPa and a temperature of from 120°C to 300°C; the filling level of the liquid fraction in the separation vessel is measured by a radiometric level measurement system comprising at least two radio-active sources and at least three radiation detectors and the filling level is controlled by a product discharge valve which operates based on data coming from the level measurement system, and wherein radioactive sources are installed at at least two different heights of the separation vessel, and radiation detectors are installed at least three different heights of the separation vessel and process for preparing ethylene homopolymers or copolymers from ethylenically unsaturated monomers in the presence of free-radical polymerization initiators at temperatures from 100°C to 350°C and pressures in the range of from 110 MPa to 500 MPa in a polymerization reactor comprising a such a process for separating polymeric and gaseous components.
Abstract:
According to the invention, the integrity of a product in a container (10) may be determined by the determination of a given feature of the product by means of a first measuring method (20), whereby a first physical property of the product is investigated. The given feature is additionally determined directly or by a second measuring method (30), base on a second physical property, different from the first physical property and the values for the given feature obtained by both methods are compared. Where the product is a drink in a bottle (10) and the given feature is the filling level, the first measuring method (20) can be measurement of the filling level by means of absorption of an X-ray beam and the second measuring method (30) is measurement of the change in the resonant frequency of a high frequency tuned circuit brought about by the bottle.
Abstract:
The invention relates to a device for determining and/or monitoring the density and/or the level (L) of a filling material (8) in a container (6). A transmitting unit (2) which emits radioactive radiation and a receiving unit (3) which is arranged in such a way that it receives the radioactive radiation or the secondary radiation that is produced by the interaction of the radioactive radiation with the filling material (8) are provided. A regulating/evaluating unit (13) which determines the density and/or the level of the filling material (8) in the container (6) using the measuring data that is supplied by the receiving unit (3) is also provided. The aim of the invention is to provide a device which enables the level or the density of a filling material in a container to be measured reliably. To this end, the receiving unit (3) consists of individual detector units (4). These detector units (4) are positioned at different distances from the floor of the container (6), so that each detector unit (4) directly or indirectly, essentially detects the proportion of radiation that passes through a defined partial area of the container (6) or that is produced in a defined partial area of the container (6).
Abstract:
Verfahren zur Reaktorfüllstandsmessung bei kontinuierlich betriebenen Polymerisationsprozessen, wobei die jeweilige Phasengrenzfläche im Reaktor mit Hilfe einer ionisierenden Strahlung gemessen wird, dadurch gekennzeichnet, dass mindestens eine Meßeinheit bestehend aus einer Strahlungsquelle, welche eine ionisierende Strahlung emittiert und einem entsprechenden Detektor an die Phasengrenzfläche im Reaktor herangeführt und dort flexibel fixiert wird, wobei die Reaktorfüllstandsmessung in der Weise erfolgt, dass man die Phasengrenzfläche mit Hilfe der radioaktiven Rückstreumessung ermittelt.
Abstract:
The invention relates to a sensor (1) for measuring density profile using gamma rays (5), which is particularly suitable for measuring the level in oil separator tanks. The known measuring principle involves conducting locally resolved measurement of a density-dependent gamma ray transmission of a medium (6a, 6b, 6c) by a vertical linear array (13) of photomultipliers( 7) and using said measurement to determine the location of an oil/water (6c) boundary layer. According to the invention, the gamma ray density sensor (1) is equipped with PIN photodiodes (10) instead of photomultipliers (7). Means for passive cooling for said photodiodes (10) are also provided. This considerably simplifies the structure, operation and maintenance of the sensor and improves local resolution and service life of the sensor (1). Passive cooling can be easily realized by building a thermal bridge (12) between the warm photodiodes (10) and the cool ambient medium or the cool wall (14) of the separator tank. Usability of the sensor (1) under difficult operating conditions and in non-easily accessible locations is generally improved.
Abstract:
The invention relates to an arrangement and a method for measuring level, interface level and/or density profile of at least one fluid located in a tank or container (2, 3) by the aid of at least two nuclear radiation sources (9) vertically arranged at a predetermined distance from each other inside or both inside and outside the tank and a detector unit (11), which are located at a suitable distance from each other and inserted into separate protection pipes (8, 10). The detector unit (11) comprises a long vertical detector in the form of a scintillator rod (12) covering the total height in the tank or the container (2, 3) having a photo multiplier tube (13) at each end and associated electronics that provides both information on position as well as radiation level at different positions along the scintillator rod (12) by measuring pulse amplitudes measured from the photo multiplier tube. According to the method the radiation absorbed from the radiation sources (9) takes place in the scintillator rod (12) forming the detector unit (11) by the aid of the photo multiplier tubes (13) at each of its ends, which transform the radiation to electric pulses having an amplitude proportion to the light intensity of the radiation at the actual position along the rod (12), whereby the amplitude is measured electronically on the two simultaneous pulses and a ratiometric calculation is then used to determine the position of the corresponding radiation quant.
Abstract:
The invention concerns a device for determining the degree of absorption and/or dispersion of a medium (8), the device comprising a radiation source (1) and a beam detector (10) and the radiation source (1) emitting reference radiation (5) of a given intensity. The beam detector (10) detects the part (7) of the reference radiation (5) which has passed through the medium (8) as well as external radiation (11) and relays a signal (12) corresponding to the intensity of the detected radiation (7, 11) to an evaluation circuit (13). The radiation source (1) emits reference radiation (5) periodically or intermittently.