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thermister element during processing at LMSC. 4. Excessive noise in the LMSC current instrumentationto the MDAC data logger was encountered. Additional filtering was added to the LMSC unit instrumentation, which improved the module current readingsbutnotthetotalcurrentreading. Itwasdecidedto eliminate the total current signal. Approval was given at TRM #1 to conduct the 80-hour Checkout Run of the LMSC unit. 4.2 TEST READINESS MEET ING 7#2 The Electrolytic Oxygen Generator was subjected to an 80-hour Checkout Runwhichwas accomplishedsuccessfullywithno shutdowns. Problemsidentified during the test and corrective actions taken subsequent to the test were the following: 1. Chatterintheheatexchangercoolantsolenoidvalvewascorrected by increasing the hysteresis of the thermister signal. 2. The oxygen 3-way solenoid valve was sticking occasionally. The duration of the current pulse to actuate the valve was increased. Since there are four valves electrically in parallel in this circuit, a mechanical malfunction of the 02 valve was suspected. The valve was disassembledfor inspection; no visible cause for stickingwasevident. ItwasagreedwithNASAtoreplacethe3- way valves later in the testing if the problem re-occurred. 3. Occasionalflickeringofthecurrentmodeindicatorlightson thefrontpanelwasobserved. Theproblemwasattributedto electronic noise; addition of a filtering capacitor to the appropriate circuit eliminatedthe problem. 4. A slow leak was detected around the threads of a stainless steel reducer bushing on the heat exchanger. When the bushing was in- stalled at Lockheed, excessive torque was required because the tappedholeintheheatexchangerheaderwasoutofround. It was, therefore, decided to seal the bushing with epoxy rather than to try applying additional torque. 70PDF Image | WATER ELECTROLYSIS SYSTEM REFURBISHMENT
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