Principles of naval engineering - Historic Naval Ships Association

PRINCIPLES OF NAVAL ENGINEERINGFigure 25-18,— Data Logger Section.27.350remote indication. The meter is calibrated in thedesired scale (PSI). These meters are in mostapplications d.c. microammeters.The pressure switch type transmitter findsits application in the alarm circuitry on the EngineRoom Console. Herein, at a given high or lowpressure, electrical contacts within the switchhousing are actuated completing or breaking acircuit and actuating an alarm.Level SensorsThree types of level sensors are generallyemployed throughout the system. Sincepressure may be a function of level the firsttwo devices used are the two detectors mentionedunder pressure; the pressure-to- currentfor indication and the pressure switch foralarm.646