Abstract: An arrangement for signal processing in ultrasonic transducers in flow meters has an ultrasonic transducer acted upon by a drive signal with the ultrasonic transducer being connected to a resonant circuit matched to the frequency of the drive signal. The resonant circuit can be a component of the network which makes switching over the ultrasonic transducer for transmitting operation to a receiving operation possible. An ultrasonic flow meter uses time-of-flight principle for transmitting and receiving ultrasonic signals and signal post-processing of the received ultrasonic signals. To make available an ultrasonic flow meter that produces an improved quality voltage signal for evaluation and at the same time makes possible a reduction of its production costs, a ringing circuit is provided. The ringing circuit may be a series ringing circuit for signal post-processing of the received ultrasonic signals connected to a comparator and using an LC-circuit, a Pi-filter or an RLC-circuit.

Abstract: The invention relates to an arrangement for signal processing in ultrasonic transducers in flow meters, wherein the ultrasonic transducer is acted upon by a drive signal, the ultrasonic transducer being connected to a resonant circuit matched to the frequency of the drive signal. The resonant circuit can be, in particular, a component of a network, which makes possible a switching over of an ultrasonic transducer from a transmitting operation to a receiving operation. The present invention further relates to an ultrasonic flow meter according to the time-of-flight principle, with means for transmitting and receiving ultrasonic signals as well as means for signal post-processing of the received ultrasonic signals.

Abstract: A clock generator contains a reference oscillator (10), a digital closed delay chain (12), a digital frequency divider (14) and a digital phase comparator (16). The frequency divider (14) is connected between the output of the adjustable delay chain (12) and one input of the phase comparator (16). The output of the reference oscillator (10) is connected to a further input of the phase comparator (16). Between the output of the phase comparator (16) and the delay chain (12) a digital up-down counter (18) is connected, the counting direction of which is determined by the output signal of the phase comparator (16) and by means of which the corresponding length of the delay chain (12) is adjustable.

Abstract: In a tilt device for seat furniture, the base, which is fastened to the chair bottom part and which carries a rotatable backrest carrier for the backrest and a seat plate for the seat, is designed as a closed carrier box composed of a plurality of sheet-metal parts and is arranged between backrest cheeks of the backrest carrier. A simple compact construction of the mechanism, which can be used without appreciable changes for a permanent-contact backrest and for a simultaneous mechanism, is obtained.

Abstract: A gas thermometer has a case with a case end section (10) made of metal of good thermal conductivity and a main case section (14) made of material of poor thermal conductivity. By means of separating walls (46, 48, 62, 64, 70) and reflector walls (66, 68), two sound paths are created in the interior of the thermometer case, which differ by twice the distance between the reflector walls (66, 68). The phase difference of partial sound wave fields which are obtained by splitting a sound wave field produced by a common sound generator (40) between the two paths is converted to an electrical signal corresponding to the temperature in the case end section (10) by using microphones (26, 28) and an analyzing circuit (92) connected with them.

Abstract: In a digital remote-sensing system, in which the time intervals between pulses are modulated according to the value of the parameter being measured, an overly sensitive sensing element 30 may generate a pulse outside of the desired "time window", which might then be misinterpreted. To avoid this, the sensitivity of such a digital sensing element 30, generating a frequency-modulated signal, can be reduced without intrusion into the actual sensor 32, by "thinning" the output pulses of the digital sensing element 30 with pulses of constant frequency. In the case of a sensor which, after receipt of a start-pulse, generates one or more measurement pulses, this is accomplished by specifying a part of the pulse-period in a timing stage 44, which operates in dependence on a constant-frequency auxiliary oscillator 46. The timing stage's output signal makes conductive a gating circuit 36, disposed between sensing element 30 and a downstream frequency divider 38-42, which generates the measurement pulses.

Abstract: The principal surfaces of an oscillator quartz crystal body for a temperature sensor oscillator are plane, parallel and of substantially the same size and are oriented with respect to the usual x-y-z coordinate system of electric, mechanical and optic axes so that the angle .phi. of the electric (x) axis with respect to either of these planes lies within a tolerance range extending from +1.degree. to -1.degree., while the angle .theta. of the optic (z) axis with respect to either of these plane lies either in the 3.degree.-6.degree. range or in the 68.degree.-72.degree. range. Since in the regions of .theta.=4.degree. and .theta.=70.degree. the change of the temperature coefficient with variation of the angle .theta.

Abstract: A temperature remote-measurement system features a central evaluation unit 10 for all measuring points connected to two conductors 12, 14, forming a main data bus. In the embodiment shown, three addressable bus switches 18-1, 18-2, and 18-3 are connected to the data bus. To each bus switch 18 are connected respective conductors 26, 28. These together form an auxiliary bus, which is either connected to, or disconnected from, the main data bus formed by conductors 12, 14, depending upon the position of breaker 20. To the auxiliary buses formed by conductors 26, 28 are connected sensing units 32-38, which can modulate (as measurement pulses) the current carried by the conductors 26, 28 and which respond to specific voltage pulses (control pulses) generated by the control unit 10 and carried over these conductors.

Abstract: An electronic thermometer has an oscillator, the frequency determining element of which is a temperature sensitive piezoelectric element (2), used as a measuring sensor, which is located inside a sealed housing (3). The piezoelectric element is provided with two termial electrodes (4, 5) which are galvanically separated from the oscillator circuit bia an inductively coupled pair of coils (6, 7); the coil (6) connected to the terminal electrodes is tightly encompassed by the housing. An evaluation unit (10) for detecting the temperature is connected to the oscillator circuit.

Abstract: An electronic thermometer has an oscillator, the frequency determining element of which is a temperature sensitive piezoelectric element, used as a measuring sensor, which is located in a sealed housing of electrically insulating material. The piezoelectric element is provided with two terminal electrodes, which are each connected via a respective capacitor to the oscillator circuit, and each of the two capacitors has electrodes, one located inside and one located outside the housing.

Abstract: Temperature measurement is effectively carried out by converting pulses derived from a pulse generator, in which the pulse gaps change as a result of a measured condition, for example temperature, by converting electrical pulses received from the pulse generator into light pulses, and then evaluating the light pulses with respect to a clock rate in a counter (22). The light pulses can readily be transmitted via a light pickup (9b) and fiber optic or the like (9a) to a remote evaluation unit. Preferably, the light is generated by a light emitting diode or a laser diode (8'), serially connected with a switching transistor (13') and energized upon receipt of a pulse from the pulse generator. The arrangement permits use of a piezoelectric element (2) such as a frequency determining quartz to control the frequency of an oscillator, the frequency of which is then converted into the pulses with the respective pulse gaps.

Abstract: A pressure or pressure-difference measuring apparatus having a central pickup body and a pressure sensor device disposed within a measuring chamber, the subchambers of which are connected via connecting canals to antechambers formed between separating diaphragms and the central pickup body, is disclosed. The apparatus also has supplementary diaphragms resting against the pickup body and connected to the connecting canals through supplementary canals. A simplified mechanical design is accomplished by having single supplementary canals, each open to a connecting canal connected to a separating diaphragm, running to the supplementary diaphragm adjacent to the device's opposite separating diaphragm.

Abstract: In a pressure or pressure difference measuring transducer comprising a diaphragm clamping housing which is held in a pressure housing by means of a ring shaped support element, and separating diaphragms which rest against suitably shaped formed beds of the pressure housing in the event of an overload, in order to obtain a comparatively compact design which can be produced at comparatively low cost, the support element is designed and connected to the pressure housing and the diaphragm clamping housing so that a connection of the pressure and the diaphragm clamping housing which is stiff in a direction parallel to the housing is produced.

Abstract: A compact, optically inconspicuous tilting device for seating units, to be attached underneath a seat including a casing disposed beneath a seat resting on the understructure of the seating unit, a seat carrier pivotably mounted about a horizontal axis to the front edge area of said seat, mechanical locking means for connecting the seat carrier within the casing including first locking members successively arranged in at least two planes parallel to the swivel axis of the seat carrier and staggered towards each other and second locking members engageable with said first locking members, a rest member connected to said casing including a shank member, a link member interconnecting said seat carrier with the shank member, a bearing member connected to said casing operably engageable with said shank member to the rest member, at least one spring element mounted on said casing which acts at one end of the seat carrier opposite to the load of the user, and bistable activation lever means for activating said mechan

Abstract: Disclosed is a standing work seat in which the support column and the base are rigidly attached together, the support column is inherently rotatable, the seat is inclinable in the seat direction. The seat exhibits a rear edge drawn up to the user's iliac crest, a rounded front edge and a slip-inhibiting configuration of the seat surface. The standing work seat permits optimum absorption of a user's body load in confined work stations.

Abstract: A pressure differential measuring apparatus comprising a cylindrical member having a first portion and a second portion of reduced diameter relative to the first portion. The first portion is provided with an outwardly extending member, while the second portion serves as a control rod. The instrument is further provided with a resilient bendable tubular member which surrounds the second portion and is connected to the outwardly extending member of the first portion by a circular electron-beam-welded seam.