Alarm Measuring System on the ship

1. The electronic and alarm measuring systems are designed for centralized supervision of processes on board ships.

2. Such systems are designed to meet the special requirements in marine applications.

3. The design of the alarm systems comprises a limited number of standard modules, and offers an economical and flexible solution for all system sizes — from small alarm systems with a few channels, to complex systems with data logging and alarm print-out functions.

4. The signals from analog and digital transducers are processed in the system and allow for simple and clear monitoring of process activities. The occurrance of abnormal conditions initiates audible and visual alarm signals.

Safety system of internal combustion engines

As a rule, the safety system is to come into action after the alarm system has operated.

Safety system of individual automated machinery is to operate when parameters exceed their limit values and is to cover all foreseeable fault conditions, assumed with regard to characteristics and operational properties of machinery concerned.

Safety system of internal combustion engines operating due to lubricating oil pressure drop and safety system of steam boilers operating due to low water level are to be independent of alarm and indicating systems, including the sensors.

Safety system of main internal combustion engine which may have influence upon manoeuvrability of the ship is to be provided with switching off facilities.

The switching off device is to be of such design as to exclude the possibility of its unintentional use and in case of safety system being switched off its position is to be indicated by means of a special signal. The switching off device need not cover safety system operating due to lubricating oil pressure drop.

Operation of Alarm Measuring Systems on vessels

Measuring systems. Analog transducers which sense temperatures, pressures, etc., in the process are connected to the system. The transducer output may be current, voltage or resistance. The input signal is filtered and normalized to a defined voltage level in the system.

The normalized measured value is connected across the system bus to the display unit when the push-button for manual measuring in the front of a module is depressed. The signal is scaled to its correct value before A/D conversion and presentation on the digital display with the correct number of decimals.

Modules of Alarm Measuring System

The typical electronic system comprises modules which are designed for mounting in the control room desk or in a cabinet front. Here are standard modules: alarm measuring module, display module, selector module, bridge panel, cabin and mess panel, power distribution unit, central unit for data logging and alarm print-out.

These modules are identical in electrical and mechanical design. The modules are made of sheet steel and are provided with ventilation holes. The internal wiring is provided with a printed circuit backplate, i. e. the "mother board", and ribbon cable. The front can be removed, and the electric boards can be inserted from the front.