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