Lesson 5 - Process Instrumentation SAQ
This lesson allows you to test yourself on the material covered in the Process Instrumentation lesson and determine the level to which you have met the learning outcomes.
Suggested Response - Q7
** How does a magflow work? Draw and label a diagram to show the principles.
Response:
Magflows operate on the principle of Faraday’s law. A magnetic field is applied across the pipe. As the velocity increases, the positively and negatively charged ions in the fluid are split in an increasing way and this causes an induced voltage in the electrodes that are placed at right angles to the magnetic field. This in turn causes an induced voltage in the electrodes that are placed at right angles to the magnetic field. The figure below illustrates this:
Figure: Workings of an electromagnetic flowmeter