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PRINCIPLES OF INDUSTRIAL MEASUREMENT
MEASUREMENT OF PROCESS PRESSURE
FLUID LEVEL MEASUREMENT
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accuracy analog signal bellows Bourdon tube cable calibration capacitance cause circuit condensate connected control loop control system control valve delays depends derivative control action diagram diaphragm differential pressure disturbance electrical energy equipment error feedback final control element flow measurement flow meter flow rate force frequency function g/litre galvanometer gauge heat transfer impulse lines increase input installed instrument integral action integral control action intrinsic safety liquid magnetic flow meter maximum measured value measured variable measurement system measuring element mechanism motor multicore cable normally nozzle operation orifice plate output pipe plant pneumatic possible power supply pressure measuring process control process flow diagram process fluid process variable proportional action factor proportional control range ratio regulating resistance response restrictor sensor servo set point shown in Fig slave controller steady-state steam tank thermocouple thermowell total flow transducer transmission transmitted vapour velocity vessel voltage whilst zero