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Figure F3. SmartPlug diagram. A. Side view. B. Cross-sectional top view with pressure period counter (PPC), battery pack (lithium thionyl chloride batteries, 7 y capacity at 1 min sampling rate), Paroscientific 8B 7000-2 pressure (P) transducers, and miniature temperature logger (MTL). Pressure case = 6 inch diameter, 8 inch outer diameter, flange-mounted end caps with high-pressure port feed through bulkheads leading to pressure sensors. Top end cap fabricated with 3.5 inch outer diameter EU 8rd thread for mounting to Baker Hughes retrievable casing packer.

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