Sampling flowmeters (called sometimes insertion flowmeters) are devices for measuring of flow-rate. The volume flow-rate is inferred on the base of the result of velocity measurement in certain point in the flow area. The two models of velocity distribution are introduced and for four possibilities of sensor placing in the pipe the formulas for distances of velocity sensor placing in the pipe are derived. The volume flow-rate is the product of measured local velocity, the flow area and the sensitivity factor. The formulae for sensitivity factor are derived for these four situations, and the volumetric flow-rate can be calculated. In conclusion are introduced some problems connected with volume flow-rate measurement with sampling flowmeter.

The ultrasonic cross-correlation flowmeter is not only a reliable measurement device due to recent improvements in signal processing; it can even be used for gaining further knowledge about the properties of turbulent flow. This paper shows as well considerations about fluctuations, measuring time and ergodicity as arrangements and necessities for multi path measurements. Results are used for averaging and first tomographic approaches for the visualization of turbulent flow.

The aim of this study is the development of a novel nonintrusive mass flowmeter for the moved bed gravity flow of the new process, i.e.: DRI ( Direct Reduction Process for Iron Ore) and the synthetic naphtha making reactor reducing the coke coal and petroleum. One of the authors already developed cross correlation method, steady state heat transfer method and PZT acoustic emission method. This paper describes a prototype of a new cross correlation method using a pulse heating marking signal based on T. Moriyama’s patent application.

At the Institute for Waterpower and Pumps, Vienna University of Technology, we have done several scientific projects in the field of flow observation in the casing of Pelton turbines. An important step in the direction of a fundamental analysis will be the measurement of the velocities of the droplets traveling in the casing and on the wall of the casing. The Austrian science fund kindly has provided a PIV-system for these investigations. The first measurements have been done on the jet at the outlet of the nozzle of the turbine. Oncoming research work will include the exact documentation of the flow through the bucket and inside of the turbine - casing.

The Coriolis meter is used for direct measurements of fluid density and mass flowrate. Its regular operation is conditional on the vibration of its measuring tube at the resonance frequency. The accuracy and quickness of the resonance control have an impact on static and dynamic meter characteristics. In the paper, results of using a phase-locked loop (PLL) control system are presented. The measurements were performed on a straight-tube meter with an electromagnetic exciter and piezoelectric accelerometers.