You are viewing the “4 Effective Methods for Flow Measurement” page. There are different methods used in basic current measurement. Thanks to these methods, the values to be measured can be obtained in different ways, precision, accuracy and application speed depending on the application. You can reach the latest trends in measurement with shunt measurement, current transformer, hall sensor, rogowski coil.
4 EFFECTİVE METHODS FOR FLOW MEASUREMENT
1 – Shunt Measurement (DC / AC)
Current measurement is made on a low value resistor (shunt) and a voltmeter connected in parallel with the resistor is used. The current varies proportionally with the voltage on the shunt resistor.
I = V / R.
Shunt can be connected to the front or back of the load. (Rising edge / Falling edge method) Our products are suitable for both kinds of use. It can also be used for both DC and AC current measurement as well as for AC + DC current junction. It is possible to measure with 0,1% accuracy and you can use 855 series current transformers for AC current measurements.
2 – Measurement With The Current Transformer Principle
It is a method used for the measurement of high currents. Usually the shunt and transformer principle is used together and the shunt inverters are also added to the solution.
Secondary windings are determined by proportional value. Galvanically isolated AC output is proportional to AC current at the input. Typical measurement accuracy is 1%.
3 – Hall Sensor (AC / DC)
A soft ferrite is attached around the conductor and a Hall sensor is installed in a small air gap. The current passing through the conductor produces magnetic flux on this ferrite. As this magnetic flux passes over the Hall sensor, a voltage proportional to the current is generated. This voltage is used proportionally for the measurement of current (AC / DC) values and provides a sensitivity between 0.5% and 1%.
4 – Rogowski Bobbin
A closed air coil without iron core is connected around the conductor passing through it. According to the current passing through the conductor, a proportional voltage is obtained on the Rogowski bobbin. The magnitude of this tension is enlarged and made suitable for use. The measurement error varies between 1-2%. However, the sensitivity reaches a much better value in high currents.
We can list the advantages and disadvantages of these four systems as follows.