US Patent 7681456 Field device including a capillary tube having a non-cylindrical lumen

In a particular embodiment, a field device is disclosed that includes a housing defining a fluid cavity and a sensor cavity and having an isolation barrier to isolate the fluid cavity from the sensor cavity. The field device further includes a pressure sensor disposed within the sensor cavity. The pressure sensor includes at least one pressure inlet. The field device also includes a capillary tube extending from the at least one pressure inlet to the fluid cavity through the isolation barrier. The capillary tube includes a lumen having a non-cylindrical shape.