Industrial Control Technology by Peng Zhang

By Peng Zhang

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Rotate the full-scale potentiometer clockwise until its voltage ceases to change, and then slowly rotate it counterclockwise until the +5 V reading is obtained again. Place the target at the minimum distance from the sensor. Do not put it any closer than 6 in. Slowly rotate the zero adjust potentiometer until a reading of 0 V is attained. 5 V is acceptable. At this point it would be useful to move the target back and forth between the minimum and maximum distances while watching the voltmeter. It should read +5 V when the target is at its maximum distance and 0 V when at the minimum.

Indd 27 5/13/2008 5:45:21 PM 28 INDUSTRIAL CONTROL TECHNOLOGY there are two kinds of magnetic switches: magnetic reed switches and magnetic level switches. Magnetic switches are suitable for applications requiring a switched output for proximity, linear limit detection, logging or counting, or actuation purposes. Flux gate and coil instruments perform a continuous measurement of the differences in the magnetic field at the ends of a vertical rod and plot these differences on a grid of the area.

11, rotating a ferromagnetic-core bearing supported within a housed stator assembly provides a basic RVDT construction and operation. The housing is passively stainless steel. The stator consists of a primary excitation coil and a pair of secondary output coils. A fixed alternating current excitation is applied to the primary stator coil that is electromagnetically coupled to the secondary coils. This coupling is proportional to the angle of the input shaft. The output pair is structured so that one coil is in phase with the excitation coil, and the second is 180° out of phase with the excitation coil.

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