Redundancy Redundancy needed for sensors, as they sometimes fail or are impacted by environmental factors Orthogonal methodology should be used to overcome common mode failures, for example: –Thermocouples are sensitive to ground loop problems, so an IR pyrometer which can be decoupled from apparatus is useful –Pulses from digital flow meters may not be properly counted by computer, so analog meter (while less precise) can be indicator of error Such redundancy is needed for all critical parameters: T, water flow, V, I, gas flow Distribution Statement A (Approved for Public Release, Distribution Unlimited)
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