Notes on Instrumentation and Control by G. J. Roy

By G. J. Roy

This revised textual content, geared toward applicants taking certification as marine engineers on service provider ships, covers modern tools and structures

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63 where negative feedback is applied, the flapper initially moves the same amount and the back pressure P 2 increases to 0-5 bar; but in doing so it causes the bellows to expand, pivoting the flapper about point 1. The nozzle/flapper gap then increases, moving it back towards, but not exactly to, its original position until a position of equilibrium is reached. The actual resultant movement of the flapper from its original position may then be only 0 · 00025 mm and the output (back pressure) will have increased by a very small amount, say 05 bar so that the output is now 0-25 bar.

Tachogenerators driven by the shaft whose speed is being measured. c. type is a generator with the flux provided by permanent magnets, using a wound armature with a commutator and designed to give an output voltage directly proportional to speed. The output is taken to a moving coil instrument calibrated in rpm. When no current is flowing, the pointer of this meter is positioned by two opposing springs, with zero at the centre of the scale. The direction of the shaft rotation controls the direction of current flow through the coil and hence the pointer shows the direction of shaft rotation as well as rpm (Fig.

The Avery-Hardoll vane type is shown in the figure, which indicates the liquid flow which, by impingement on the blades, causes the rotor to move in a clockwise direction. The rotor provides a seal against the wall of the working chamber at the inlet, whilst the blades are kept in contact with the working chamber surface by the fluid pressure, trifugal force and gravity. The blades are free to slide on the rods. d. meters. Pipe bores of 200 mm can be accommodated with flows of approximately 12 litres/sec.

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