Abstract: An apparatus for measuring light scatter, the apparatus having a light transmitter and reception optics for transmitting and detecting a light beam scattered in a measured zone, respectively, wherein an adjustment unit changes between a measuring mode wherein the optical axes of the light transmitter and the reception optics stand at an angle with respect to one another and intersect in the measured zone and a test mode wherein the optical axes of the light transmitter and the reception optics are parallel, wherein the light beam successively sweeps over the reception optics. The reception optics is rotatably held at a displaceable rotary axle, wherein the adjustment unit first rotates the reception optics about the rotary axle in the test mode until the optical axis of the reception optics is parallel with the optical axis of the light transmitter and then displaces the rotatable axle together with the reception optics.

Abstract: An ultrasonic measurement apparatus (10) for measuring the flow velocity of a fluid is provided which flows in a pipeline in a main flow direction, wherein the ultrasonic measurement apparatus (10) has an ultrasonic measurement zone (36) with at least a pair of ultrasonic transducers (38), an evaluation unit for determining the flow velocity from a propagation time difference of ultrasound transmitted and received with and against the flow, as well as a deflection unit, by means of which the fluid from the main flow direction is deflectable and suppliable to the ultrasonic measurement zone (36). In this respect the deflection unit (20, 26, 32) forms a loop.

Abstract: The invention relates to an ultrasonic gas flow meter and corresponding method of verification, where the ultrasonic gas flow meter comprises at least one signal evaluation unit, memory, piping through which gas can flow, and ultrasonic transducers disposed on opposite sides of the piping; the ultrasonic gas flow meter is adapted to detect a flow velocity of the gas flowing through the piping. The method comprises a test procedure for verifying the operation of electronics associated with the ultrasonic gas flow meter wherein, when the test procedure is activated, test signals are triggered which replace the propagation times measured with predefined propagation times associated with an assumed gas flow velocity and the output of the evaluation unit is detected to see how the calculated gas flow velocity compares to the assumed gas flow velocity.

Abstract: The invention relates to a flow conditioner for conditioning a fluid flow comprising a pipe having a constriction with a reduced pipe cross-section, at least one ring-shaped element arranged inside the pipe which has an outer diameter which is smaller than the inner diameter of the pipe in the axial region of the pipe in which the at least one ring-shaped element is arranged, and having an areal web whose surface normal is not in parallel with the pipe axis. The invention further relates to a throughflow measurement system for measuring a fluid throughflow through a pipe having a measurement device and a flow conditioner in accordance with the invention arranged upstream of the measurement device.

Abstract: An ultrasonic measurement device (10) for determining a flow velocity of a fluid in a conduit comprises a pipe section (12) having a central longitudinal axis (22) and a cross section (24) with a radius (R), the central longitudinal axis (22) defining a horizontal reference plane (26); at least a first two-path measurement system with a first path (30a) and a second path (30b) defined by a first pair of ultrasonic transducers (32) and a second pair of ultrasonic transducers (32) mounted to the wall of the pipe section (12), the ultrasonic transducers (32) of each path (30a-b) opposing each other at the ends of their path (30a-b), each path (30a-b) oriented parallel to the horizontal reference plane (26) with a distance to the horizontal reference plane (26) while having a component transverse to the central longitudinal axis (22); first evaluation means (38) to determine a first flow velocity value from the first path (30a) by comparing the ultrasonic transit times along the first path (30a) with and again

Abstract: The invention relates to a method of measuring a gas flow velocity using an ultrasonic gas flow meter, wherein said ultrasonic gas flow meter includes a horizontal piping through which gas can flow in a flow direction and which has a central axis, at least one pair of measurement paths of equal length spaced apart, extending parallel to one another in separate horizontal planes and inclined to said flow direction, wherein each horizontal plane of a pair of measurement paths is vertically offset by an equal predefined distance from said central axis, wherein an ultrasonic transducer is arranged at each end of said measurement path and each ultrasonic transducer is adapted to selectively act as an ultrasonic transmitter and an ultrasonic receiver, the method comprising the steps of measuring a flow velocity of said gas in a measurement path arranged in an upper region of said piping, measuring a flow velocity of said gas in a measurement path arranged in a lower region of said piping and using the results of th

Abstract: An ultrasound measurement apparatus (10) is set forth for measuring the flow speed of a fluid in a conduit (12) having a plurality of ultrasonic transducers (14) pairs of which span between them a plurality of main measurement paths and at least one diagnosis measurement path, and having an evaluation unit (12) which is made to determine a respective individual measured value for the flow speed from transit times of ultrasound transmitted and received with and against the flow on each measurement path (16, 18), to calculate individual measured values of the main measurement paths as a main measured value for the flow speed, to determine a measured diagnosis value from the at least one individual measured value of the diagnosis measured path and to compare the main measured value and the measured diagnosis value with one another.

Abstract: An ultrasonic measurement device (10) for determining a flow velocity of a fluid in a conduit comprises a pipe section (12) having a central longitudinal axis (22) and a cross section (24) with a radius (R), the central longitudinal axis (22) defining a horizontal reference plane (26); at least a first two-path measurement system with a first path (30a) and a second path (30b) defined by a first pair of ultrasonic transducers (32) and a second pair of ultrasonic transducers (32) mounted to the wall of the pipe section (12), the ultrasonic transducers (32) of each path (30a-b) opposing each other at the ends of their path (30a-b), each path (30a-b) oriented parallel to the horizontal reference plane (26) with a distance to the horizontal reference plane (26) while having a component transverse to the central longitudinal axis (22); first evaluation means (38) to determine a first flow velocity value from the first path (30a) by comparing the ultrasonic transit times along the first path (30a) with and again

Abstract: The invention relates to a method of measuring a gas flow velocity using an ultrasonic gas flow meter, wherein said ultrasonic gas flow meter includes a horizontal piping through which gas can flow in a flow direction and which has a central axis, at least one pair of measurement paths of equal length spaced apart, extending parallel to one another in separate horizontal planes and inclined to said flow direction, wherein each horizontal plane of a pair of measurement paths is vertically offset by an equal predefined distance from said central axis, wherein an ultrasonic transducer is arranged at each end of said measurement path and each ultrasonic transducer is adapted to selectively act as an ultrasonic transmitter and an ultrasonic receiver, the method comprising the steps of measuring a flow velocity of said gas in a measurement path arranged in an upper region of said piping, measuring a flow velocity of said gas in a measurement path arranged in a lower region of said piping and using the results of th

Abstract: The invention relates to a method of operating an ultrasonic gas flow meter, the ultrasonic gas flow meter including at least one signal evaluation unit, at least one memory, a piping through which gas can flow, at least one pair of ultrasonic transducers disposed on opposite sides of the piping and separated by a path inclined to a flow direction of the piping, wherein each ultrasonic transducer is connected to an electronic circuit to selectively act as an ultrasonic transmitter and an ultrasonic receiver, wherein the ultrasonic gas flow meter is adapted to detect a flow velocity of the gas flowing through the piping on the basis of differences between propagation times of ultrasonic signals transmitted and received between each pair of transducers and propagating in opposite directions along the path, wherein the method includes a test procedure for verifying the operation of electronics associated with the ultrasonic gas flow meter wherein, when the test procedure is activated, test signals are triggered

Abstract: An ultrasound measurement apparatus (10) is set forth for measuring the flow speed of a fluid in a conduit (12) having a plurality of ultrasonic transducers (14) pairs of which span between them a plurality of main measurement paths and at least one diagnosis measurement path, and having an evaluation unit (12) which is made to determine a respective individual measured value for the flow speed from transit times of ultrasound transmitted and received with and against the flow on each measurement path (16, 18), to calculate individual measured values of the main measurement paths as a main measured value for the flow speed, to determine a measured diagnosis value from the at least one individual measured value of the diagnosis measured path and to compare the main measured value and the measured diagnosis value with one another.

Abstract: To provide an improved method and an improved measuring apparatus for determining a particle concentration with which the disadvantages of the transmission measurement principle and of the scattered light measurement principle can be compensated to a certain degree to achieve a higher precision in the particle concentration measurement, a method and a measuring apparatus are proposed in accordance with the invention, wherein measured value pairs are determined at specific times over a time period, with the measured value pairs each comprising a measured extraction value in accordance with the principle of transmitted light measurement and a corresponding measured scattered light measurement in accordance with the principle of scattered light measurement; the measured values are stored; a correction value is determined using the stored measured value pairs in a measured value preparation phase subsequent to the time period; the measured extinction value then currently determined after this is corrected usin

Abstract: An ultrasonic measurement apparatus (10) for measuring the flow velocity of a fluid is provided which flows in a pipeline in a main flow direction, wherein the ultrasonic measurement apparatus (10) has an ultrasonic measurement zone (36) with at least a pair of ultrasonic transducers (38), an evaluation unit for determining the flow velocity from a propagation time difference of ultrasound transmitted and received with and against the flow, as well as a deflection unit, by means of which the fluid from the main flow direction is deflectable and suppliable to the ultrasonic measurement zone (36). In this respect the deflection unit (20, 26, 32) forms a loop.

Abstract: A modular dust measuring device (10) is set forth for the determination of a foreign body concentration in a gas having at least one optical sensor head (14) which has a light transmitter (16) and a light receiver (22) and having a central unit (12) which has an evaluation unit (30) and a scavenging air unit (32), wherein the evaluation unit (32) is made to determine the foreign body concentration with the help of a scattered light intensity or transmitted light intensity recorded by the light receiver (22) and the scavenging air unit (32) can supply the sensor head (14) with scavenging air to avoid or eliminate impurities or deposits.

Abstract: A modular dust measuring device (10) is set forth for the determination of a foreign body concentration in a gas having at least one optical sensor head (14) which has a light transmitter (16) and a light receiver (22) and having a central unit (12) which has an evaluation unit (30) and a scavenging air unit (32), wherein the evaluation unit (32) is made to determine the foreign body concentration with the help of a scattered light intensity or transmitted light intensity recorded by the light receiver (22) and the scavenging air unit (32) can supply the sensor head (14) with scavenging air to avoid or eliminate impurities or deposits.

Abstract: A device for measuring the flow velocity and/or the throughput of a fluid by means of ultrasound, with at least one ultrasonic transducer (16, 18) arranged on the outside of a wall (14) of a pipeline (12) and in contact with the wall (14). In order to provide an improved measurement device, with which the maintenance expense can be reduced and which has a greater measurement accuracy, a portion (32) of the wall forms a part (30) of the ultrasonic transducer.

Abstract: An ultrasound transducer has a housing, at least one piezoelectric element, and a membrane emitting or receiving ultrasound. A mass ring is arranged at an edge portion of the membrane for the dampening of undesirable resonances. To provide an ultrasound transducer with the smallest possible dimensions, the ultrasound transducer is configured as a lengthwise or longitudinal oscillator, the mass ring is separate from the membrane and is joined to both the edge portion of the membrane and the inside of the housing. A ring-shaped dampening element is attached to the inside of the housing and is located next to the mass ring.