Downhole sensor deployment assembly

A well system, comprising:

• a completion string extendable into a borehole penetrating a formation;
• at least one downhole sensor deployment assembly secured to the completion string and including:
• a body coupled to the completion string;
• one or more arms pivotably coupled to the body;
• a sensor pad coupled to each arm and movable from a retracted position, where the sensor pad is stowed adjacent the completion string, and an actuated position, where the sensor pad is extended radially away from the completion string to contact one of the formation and an inner wall of a casing string secured within the borehole;
• one or more actuators pivotably coupled to the body at a first end and pivotably coupled to a corresponding one of the one or more arms at a second end, the one or more actuators being operable to move the sensor pad to the actuated position, wherein the one or more actuators are hydraulic piston actuators, and wherein each hydraulic piston actuator comprises a piston chamber, a piston movably positioned within the piston chamber and having a stem that extends out of the piston chamber and is pivotably coupled to the corresponding one of the one or more arms, and a frangible member arranged in a wall of the piston chamber and being configured to fail upon assuming a predetermined pressure threshold to allow the piston to move within the piston chamber upon failure of the frangible member;
• and
• one or more sensor devices coupled to the sensor pad for determining at least a resistivity of the formation, the one or more sensor devices comprising at least one of a sensing electrode, a transceiver, and a transmitter;
• and
• a communication line communicably coupled to the at least one downhole sensor deployment assembly for transmitting signals indicative of the resistivity of the formation to a surface location.