A method and an arrangement for ultrasonic flow measurement according to the transit-time method is provided for accurate and non-invasive flow measurement independent of the viscosity. At least one sound transducer pair is provided that has a clamp-on ultrasonic transducer operating in transmitting operation and a clamp-on ultrasonic transducer operating in receiving operation. The cross-section of a measurement tube through which a gaseous or liquid medium flows is substantially a pentagon having a base side and having sides adjacent at right angles and having sides adjacent thereto and lying opposite the base side, which include an angle of less than 180°. The sound transducer pair is arranged on the base side in order produce first sound paths. Because of flattening of the vertex lying opposite the base side, the same sound transducer pair additionally produces a second sound path.

A method and system of calibrating uncalibrated sensors among sensors distributed along a pipeline network include designating a set of the sensors as upstream sensors based on their geopositions, and designating remaining ones of the sensors other than the set of the sensors as downstream sensors. The method also includes determining a temporal delay associated with each of the sensors. Calibrating the uncalibrated sensors is based on the corresponding temporal delay and on calibrated sensors among the sensors.

A system and method including a weighing scale configured to measure a starting weight at a start time of a vaporizer chamber with a vaporizable liquid, the weighing scale configured to measure an ending weight at an end time and a controller configured to determine a vapor flow rate out of the vaporizer chamber based on a difference between the start time and the end time.

An apparatus for measuring air flow in a duct includes a sensor fittable into connection with the duct. The sensor includes an ultrasound transmitter, at least two ultrasound receivers, and a control unit to which the ultrasound transmitter and ultrasound receivers are connectable. The apparatus further includes means for measuring temperature. In a method, with the apparatus, the temperature of the air and/or of a sensor in a duct is measured with means for measuring temperature. A sensor calibration measurement at the temperature in question is performed with the apparatus if a calibration of the sensor at the measured temperature and/or within a certain predefined temperature range has not been performed earlier from the environs of the measured temperature, and temperature compensation data for the measurement result of air flow, the data being formed on the basis of calibration measurement, is determined and/or recorded in memory with the apparatus.

A method for calibrating a multiple flow conduit flow meter (200) is provided according to an embodiment of the invention. The multiple flow conduit flow meter (200) includes a first flow conduit (201) conducting a first flow stream and a pair of first pickoff sensors (215, 215′) affixed to the first flow conduit (201). The multiple flow conduit flow meter (200) further includes at least one additional flow conduit (202) conducting at least one additional flow stream and at least one pair of additional pickoff sensors (216, 216′) affixed to the at least one additional flow conduit (202).

A method of ultrasonic clamp-on flow measurement according to the transit time difference method and apparatus for the implementation of the method, wherein the electromechanical transducer element of at least one of the two acoustic transducers is comprised of at least two array elements and a correction factor is determined by comparing the transit times between the acoustic transducers while using different array elements.

Level measuring device which can compensate the distortions, caused by an STC filter, of the received signal, by measuring a reference signal which passes through the receiving branch and also through the STC filter, during the ongoing operation of the level measuring device or during manufacture. For example, after passing through the receiving branch, this reference signal can be fed to a microprocessor which can calculate the correction values of the IF signal therefrom. A switch can be provided which can switch over between the reference signal and the IF signal.

A filling level transmitter for measuring a filing level of a liquid includes: a filling level sensor having: an ultrasonic transceiver configured to emit ultrasound, and sensor electronics; a sound-conducting tube having two reflectors spaced apart from one another, the first reflector being configured to deflect ultrasound emitted by the transceiver in the direction of the second reflector, and the second reflector being configured to deflect the emitted ultrasound in the direction of the surface of the liquid. A third reflector is arranged in the second reflector such that emitted ultrasound impacting the third reflector is reflected in the direction of the first reflector.

Embodiments of the present disclosure generally provide a grey water interface valve liquid level sensor system. The liquid level sensor system may deliver information about the water level and the water movement that occurs in a water reservoir. A control unit may then activate a valve to open so that the water can be removed via vacuum.

During a water draw test, horizontal type bidirectional sphere provers with a straight calibrated section of pipe between the detector switches sometimes suffer from sphere launch failure which typically results in a failed water draw test. These types of provers, especially in larger pipe diameters will benefit from an elongate concentric fabricated reducer attached to the outlet of each launch tube. These elongate concentric fabricated reducers result in a successful sphere launch on the first attempt. Assuming all the other components of the prover are properly designed and assembled, a successful sphere launch will result in a successful water draw test on the first attempt saving time, money and reputation.