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of the control band, the water feed solenoid valve opens; and the 12-second waterfeedtimerstarts. Twelvesecondsisthemaximumfeedtime;theflow control valve is set to deliver sufficient water in approximately seven seconds. As water is fed to the reservoir, the liquid level rises and reaches the top of thecontrolband. Atthispoint,thesolenoidvalvecloses,the12-secondtimer resets,anda10-minutetimerstarts. Duringthis10-minuteperiod,thewater feed signal is overriden so that another water feed cannot occur until the timer resets. The feed water supplied to the system passes through an ion canister containingapproximately0.69 kg (1-1/2 pounds) of mixed anion-cationexchange resin. Theoutletofthecanistercontainsaparticulatefilter. 2.3.4 DifferentialPressure Two differential pressure controllers mounted on each module are set to controlthehydrogenandoxygenpressuresat6.22kN/m (25in.E20)abovethe electrolytepressureinordertomaintaingas-liquidphaseseparation. EachAP controlleris essentiallyavalveinoperatingprinciplewithaspringloaded valvestemattachedtoarollingdiaphram. Thevalveseatisadjustedsothat 6.22kN/m2 (25in.H20)higherpressureonthegassideofthediaphramthanon the liquid side is required to overcome the spring and open the valve. 2.3.5 CurrentRegulationandOxygenOutputControl Each electrolysis module is provided with a current controlled switching regulatortocontroltheDCcurrentinput. Oxygenoutputisadirectfunctionof thecurrentvalue. Thecurrentvalueisselectedbydigitalcommand(positive digital logic) according to the following: Control Signals ABC (on-off) (high-low) (standby) Current Amperes 0000 001 0 010 0 011 0 1 0 0 4.5 101 4.5 110 12.0 1 1 1 8 UndefinedPDF Image | WATER ELECTROLYSIS SYSTEM REFURBISHMENT
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