Permanent Magnet Moving Coil Instrument
Variety of instruments are used onboard for measuring parameters of electrical machinery and systems. A permanent magnet moving coil (PMMC) is one such instrument which is popularly used onboard for…
Megger- Construction And Operation
The most important routine maintenance for electrical machinery involves checking of insulation resistance, which is done by n instrument called “Megger ” or “ohmmeter ”. Insulation Resistance Insulation resistance (I.R)…
Power Generation On Ships:
A ship is equivalent to a floating city that enjoys almost all privileges available to any operational set-up on land. Just like any conventional city, the ship also requires the…
Remote Indicating Compass
Magnetic deviation is compensated for by swinging the compass and adjusting compensating magnets in the instrument housing. A better solution to deviation is to remotely locate the magnetic compass in…
Vertical Magnetic Compass
Solutions to the shortcomings of the simple magnetic compass described above have been engineered. The vertical magnetic compass is a variation of the magnetic compass that eliminates the reverse rotation…
Direction Indicating Instruments
A myriad of techniques and instruments exist to aid the pilot in navigation of the aircraft. An indication of direction is part of this navigation. While the next chapter deals…
Total Air Temperature Measurement
Air temperature is a valuable parameter that many performance monitoring and control variables depend on. During flight, static air temperature changes continuously and accurate measurement presents challenges. Below 0.2 Mach,…
Turbine Gas Temperature Indicating Systems
EGT is a critical variable of turbine engine operation. The EGT indicating system provides a visual temperature indication in the cockpit of the turbine exhaust gases as they leave the…
Thermocouple Temperature Indicators
A thermocouple is a circuit or connection of two unlike metals. The metals are touching at two separate junctions. If one of the junctions is heated to a higher temperature…
Ratiometer Electrical Resistance Thermometers
Another way of indicating temperature when employing an electric resistance thermometer is by using a ratiometer. The Wheatstone-bridge indicator is subject to errors from line voltage fluctuation. The ratiometer is…
