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reset condition and gets set by initiation of a shutdown signal. Switch S2 provides a manual override of the shutdown signal for module startup purposes. The "shutdown" signal is derived from nor-gate circuitrywhich continuously monitorsthefollowingsafetycircuits:(1)moduletemperatures,(2) 2'112H andsystemsafetypressure,(3)H2 detector,(4)electrolytevolumeand(5) interruptionof60Hzpower. Eachsafetycircuit,exceptforitem(5)above, has its own memory latch which allows the system to indicate what type of malfunctioncausedtheshutdown. Theinputtothesememorylatchesisdriven by the safety sensors. When an out-of-tolerance condition exists, the respec- tivelatchwillbe"set". Aresetconditioncanbeobtainedbydepressing the system reset button S1. 2.4.1 ModuleTemperature A thermister is located in each module, in contact with an end electrode. Thelogiccircuitsforthesesensorshavetwosettings: oneat30°C(86°F)and thesecondat40°C(104°F). The300C(86°F) pointprovidesawarningsignal; the40°C(104°F)pointsignalsautomaticsystemshutdown. Anyoneofthefour temperature sensors can actuate the shutdown. 2.4.2 GasPressure The oxygen and hydrogen lines in the modules each contain a pressure transducer set to actuate automatic shutdown if the pressure reaches approxi- mately20.7kN/m2 (3psig). Iftheoxygenpressureisbelow10.35kN/m2 (1.5 psig), the system will also automatically shut down. 2.4.3 ElectrolyteVolume The logic circuit for the reservoir pressure transducer has set points atliquidlevelsoneinchaboveandbelowthewaterfeedcontrolband. Liquid level at either of these points will result in an automatic safety shutdown. 2.4.4 EydrogenDetector A hydrogen detector is located directly over the electrolysis modules and will signal automatic shutdown if the hydrogen concentrationreaches 0.8%. 2.4.5 60HzInterrupt The loss of the 115 Vac, 60 Hz power input to the unit, even if momentary, willautomaticallyputthesystemintheshutdownmodefromwhichitwillhave to be restarted. 14PDF Image | WATER ELECTROLYSIS SYSTEM REFURBISHMENT
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