Here are suitable transducer or measuring devices for each parameter:
(a) Accurate remote reading of a diesel engine exhaust temperature:
- Thermocouple with remote transmitter: Offers high accuracy and remote signal transmission via cable or wirelessly.
(b) Accurate remote reading of the twist of a propeller shaft:
- Strain gauge: Mounted on the shaft, it detects deformations caused by twisting and conveys a proportional electrical signal for remote measurement.
(c) Accurate and remote position of a diesel engine governor or fuel rack:
- Linear potentiometer: Attached to the moving element, it provides a voltage proportional to position, allowing remote monitoring.
(d) Speed of a ship’s main propeller shaft in RPM:
- Shaft encoder: Mounted on the shaft, it counts rotations and transmits the data for RPM calculation and remote display.
(e) Remote reading of a ship’s intermediate shaft bearing temperature:
- Resistance temperature detector (RTD): Provides accurate remote temperature readings even in harsh environments.
(f) Remote reading of lubricating oil pressure in a diesel engine:
- Pressure transducer: Installed in the oil line, it converts pressure to an electrical signal for remote monitoring.
(g) Flow rate of a water maker:
- Electromagnetic flow meter: Non-invasive and accurate for measuring water flow without obstructing the pipe.
(h) Simple local pressure reading of ships fire-main:
- Pressure gauge: Provides a direct local reading of pressure in the fire-main system.
(i) Position of the steering gear or rudder:
- Potentiometer or rotary encoder: Similar to (c), these track the rudder’s rotational angle for remote indication or steering control.
(j) Local reading of jacket cooling water temperature:
- Liquid crystal thermometer (LCD thermometer): Provides a simple and cost-effective local temperature reading.
Remember, the choice of the most suitable device depends on factors like desired accuracy, remote vs. local monitoring needs, budget, and environmental considerations. Consult with specialists and consider specific requirements for optimal selection and implementation.