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Preface to First Edition
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actuator adjustable amount automatic balance basic basis weight bellows black liquor bleach bulb capacitance capacitor cell chemical chips chlorine chlorine dioxide circuit computer control constant control action control loop control system control valve controlled variable cylinder density detector diaphragm differential pressure digester dryer electrical electrode feedback float flow measurement flow rate flowmeters fluid force force-balance Foxboro Foxboro Company freeness humidity indicating input instrument ions level measurement light liquid level magnetic manometer material measurement system measuring device measuring element meter method nozzle operation optical orifice orifice plate output paper industry paper machine percent plug pneumatic primary device process computer proportional controller pulp and paper radiation ratio recording controller resistance rotating sample sensor set point sheet shown in Figure signal slurry sodium chlorate solution specific gravity speed steam storage tank temperature thermal systems thermocouple tion transmitter tube typical unit vapor velocity viscosity voltage weir