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An acid neutralizer is protected with a deluge system that pumps water into the neutralizer when an unsafe high temperature is detected. The valves on

  1. An acid neutralizer is protected with a deluge system that pumps water into the neutralizer when an unsafe high temperature is detected. The valves on the water line are normally closed and will open when de-energized (fail open). How should this SIF be characterized in terms of operating mode?
    1. Energize to trip
    2. De-energize to trip
    3. Fail last
    4. Foolproof

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