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£i/c Skstems, Joc. Sensors. There were nine sensors used in the STS. Table 5 lists these sensors and their uses. The three differential pressure transducers and the water pressure transducer are bridge transducers with internal conditioning circuts. Three stainless steel-sheathed thermistor temperature sensors were included in the system. One measured the tempeature of the control and monitoring instru- mentation circuits and two measured module temperature, one for control and one for monitoring. The final sensors in the system were two thermocouples, one connected to the liquid coolant loop and the other one connected to the gas separator circulating loop. These sensors were connected to external monitoring equipment, only, and were not used as part of the system monitoring or control instrumentation. Condenser Separators Two water-cooled condenser/separator assemblies were available in the GSA to allow operating the SFWEM during the test program at off-design conditions. Manually operated valves allowed the insertion or removal of the condenser/ separators from the 0 and H2 producing streams. During normal system operation these units are not u ed. For testing at off-design conditions (which produce high humidity levels, i.e., high temperature, low pressure, low electrolyte concentration, in the product gases) these units would be switched into place. Gas Separator Unit The GSU was designed for location outside of the STS (Figure 15) since it was not needed at design operating conditions. It consisted of a circulating pump, accumulator, a gas separator tank, and a variety of hand valves and gauges. The GSU served to identify if gases were present in the SFWEM water feed compartments and in what quantities. The GSU was connected to the STS by a quick disconnect fitting and used hand valves to control its operation. When the GSU is circulating fluid through the feed compartments of the module, any gas contained in the feed system was trapped in the gas separator tank. This tank is transparent and the amount of gas can be measured. The GSU is capable of circulating water feed compartment fluids through the six cells of the module at a pressure and temperature equal to the module's operating valves. This is important, since any pertur- bations in these parameters during the circulating mode could impair the accuracy of the gas measurement. Fluid and Electrical Supplies The STS required N at a pressure of 310 kN/m2 (45 psia) for purging the H2 and 02 lines of the STS and SFWEM during a shutdown sequence. Cooling water at 277 to 289K (40 to 60F) is required to remove the SFWEM heat via the heat exchanger in the STS. When the condenser/separators are used they also require cooling water. ThS GSA also supplied the water required for electrolysis at a rate of 0.725 cm /min (2.30 lb/day) when the SFWEM was operating at design conditions. This water is city supply water which has been processed through a deionizer column. 48PDF Image | WATER ELECTROLYSIS MODULE
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