Patent ID: 6992492

Claim:
A capacitive sensor for measuring a stimulus parameter, the sensor comprising: a circuit board including at least one metallic layer; a metallic diaphragm coupled to the circuit board and juxtaposed to the metallic layer to thereby form a transducer capacitor characterized by a capacitance, the metallic diaphragm being adapted to move relative to the at least one metallic layer in response to a change in the stimulus parameter, whereby the capacitance changes in accordance with the change in the stimulus parameter; an oscillator circuit configured to generate a filtered signal characterized by a frequency, whereby the frequency changes in accordance with capacitance changes; a conductive ring disposed between the metallic diaphragm and the circuit board; and a pressure port assembly coupled to the conductive ring, whereby a cavity is formed between a pressure port and the metallic diaphragm, the pressure port assembly further including: a snap-on cap coupled to the conductive ring; and a compressible sealer element disposed between the snap-on cap and the metallic diaphragm, whereby substantially symmetrical forces are applied to the metallic diaphragm to thereby seal the cavity.