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ELEMENTS OF A CONTROL SYSTEM
11 other sections not shown
active coils adjustment air flow amplifier analog circuit analog computers arrangement automatic balance bellows boiler C/R ratio calibration calorimeter cent of maximum circuit constant control signal control system controlled variable controlled-variable curve damper lever decreases desired range diaphragm differential displacement drive arm effect equal equation feedwater flow Figure Flow Transmitter fluid Force-balance machine fuel flow fulcrum furnace gage gas flow heat increase input signal integrator Inverted bell lb-in lb/in length linear linkage load loop manipulated variable meter moment-balance machine needle valve negative feedback output range output signal pilot valve piston plot pneumatic poppet valve position potentiometer power operator present range pressure in chamber produce proportional band proportional control proportional-plus-reset controller pushrod ratioing relay reset resistor set point shown in Fig shows specific gravity spring force steam flow steam pressure steam temperature superheater Supply transducer value of column vary velocity voltage volts water level zero