Abstract
The first step towards centralized control of marine machinery is to extend the conventional control and instrumentation facilities to a central control console, usually housed in a special air conditioned control room, such as controlling equipment for auxiliary boilers and engine cooling circuits in a ship. Instrumentation and alarms had been improved, and then fitted more extensively to give more complete monitoring with shut down as appropriate. Monitoring and controlling equipment together with various alarms must continue to operate when any or all machinery and systems being monitored, have failed. The power supply for electrical alarms and control equipment is therefore independent of the main supply and is based on a 24 V direct current (d.c.) system. The simple control loop has three elements, the measuring element, the comparator element, and the controlling element. The loop may be affected pneumatically, electronically or hydraulically. The disadvantages are a small working signal, the problem of controlling or compensating for the cold junction temperature, and lower accuracy.
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