A method and apparatus for correcting distortion of image-taking video signals are provided. The plurality of passages are configured and disposed to guide a fluid at the first surface through the second surface. Any conductivity of the water alters the excite signal, and the modified signal is compared to the reference signal to establish a value indicative of the conductivity of the water. The result is devices, systems, and methods to provide improved access to the compression chamber to attend to jamming maintenance.