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The next safety status indication is excess hydrogen or oxygen gas pressure. Ifeithergaspressureinthedischargemanifoldexceeds20.7kN/m2 (3 psig),theappropriateindicatorisilluminatedinredandthesystemis automaticallyshutdown. Thenextsafetystatusindicationislowsystem pressure. Ifthesystempressurefallsbelow10.35kN/m2 (1.5psig),the indicator is illuminated in red and the system is automatically shut down. Thenextsafetystatusindicationiselectrolytevolume. Iftheelectrolyte level rises to near the top or drops near the bottom of the reservoir ( + approximately 3% of total electrolyte volume), the respective indicator is illuminatedinredandthesystemisautomaticallyshutdown. Thenextsafety statusindicationishydrogendetectedinthecabinet. Ifthehydrogendetector senses a hydrogen concentration of 0.8% by volume, the indicator is illuminated in red and the system is automaticallyturned off. Safety Controls The safety controls are located below the module temperature displays. Thefirstcontrolisthesystemreset. Whenthesystemisde-energized, either automaticallyor by interruptionof the 60 Hz power suppliedto the unit, the reset switch lamps are de-energized. Before the system can be manually restarted, the reset switch must be depressed and illuminated in green. Ifthesafetyconditionthatcausedtheshutdownhasnotbeencorrected, thesystemwillnotreset. Duringinitialstartup,theresetmustalsobe depressed if the light is not illuminated. One important factor in the operation of the reset switch is that when the switch is not illuminated, the remaining control switches indicate the switch position, not the status of the component. This is done to allow the operator to know what components will be energized when the reset switch is actuated. Thecomponentsthatarede-energizedwhentheresetisoffarethe electrolyte pump, the water feed system, and the electrolysis modules. Thenextsafetycontrolistheoverrideswitch. Whenthisswitchis illuminated in yellow, the safety circuits are overriden and they will not automaticallyturnthesystemoff. Thefinalsafetyswitchisthenitrogen purge. Theupperhalfoftheswitchisilluminatedwhenthenitrogenpurge solenoidsareopen. Thelowerhalfoftheswitchisilluminatedwhenmanual purge is selected. 28PDF Image | WATER ELECTROLYSIS SYSTEM REFURBISHMENT
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