Abstract
One of the simplest and commonly used instruments for measuring the flow of homogeneous substances is the rotational flow meter. The main part of such a device is a rotor (vane or screw) rotating at a speed which is the function of the fluid or gas flow rate. A pulse signal with a frequency proportional to the speed of the rotor is obtained at the sensor output. For measurements in dynamic conditions, a variable interval between pulses prohibits the analysis of the measuring signal. Therefore, the authors of the article developed a method involving the determination of measured values on the basis of the last inter-pulse interval preceding the moment designated by the timing generator. For larger changes of the measured value at a predetermined time, the value can be determined by means of extrapolation of the two adjacent interpulse ranges, assuming a linear change in the flow. The proposed methods allow analysis which requires constant spacing between measurements, allowing for an analysis of the dynamics of changes in the test flow, eg. using a Fourier transform. To present the advantages of these methods simulations of flow measurement were carried out with a DRH-1140 rotor flow meter from the company Kobold.
Highlights
One of the simplest and commonly used instruments for measuring the flow of homogeneous substances is the rotational flow meter
When measuring off-line, first you write to memory the location of all pulses in the time of registration, and after the completion of the measurement determines a value measured in the moments of measurement adopted
The methods presented further allow analysis requiring constant spacing between measurements, allowing for an analysis of the dynamics of changes in the test flow, e.g. using a Fourier transform. Another feature of the measurement systems using such methods is the ability to integrate the channels of voltage, in which the voltage signal is converted to digital form in the analog-digital channels with a frequency signal [6]
Summary
One of the simplest and commonly used instruments for measuring the flow of homogeneous substances is the rotational flow meter. An essential part of rotary flow metres is the rotor rotating at a speed proportional to the fluid flow rate. When measuring off-line, first you write to memory the location of all pulses in the time of registration, and after the completion of the measurement determines a value measured in the moments of measurement adopted. In this case the measured value is determined by the position of the pulse preceding the moment of measurement, and occurring after that moment. By measuring the pulse frequency we can calculate the volume flow of the flowing fluid
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