A PLL including an adaptive loop filter. The act of inserting the fastener expands fastener arms to secure the fastener in the hole, and positions locking protrusions of a post within notches of the arms, to lock the fastener within the hole. Said hydrophobic interface surface has a higher hydrophobicity than the second interface surface. Upon exposure of the sensor to a fluid containing the analyte, a response is detected based on a change in the pKa of the polymer. The selected bitline pair or pairs are provided with a plateline pulse.