Probe for sensing fluid level

摘要: An apparatus (50, 100, 150) for sensing a surface level (20) of fluid (12) includes generally cylindrical central conductor (16, 102, 152) connection to pulse signal source (26) with reduced diameter end (28, 104, 154) and an opposite (24, 124, 168); tubular outer (14) concentric the having one open (32) adjacent (18) end, forming transmission line signals generated by cavity (C) between interior wall exterior conductor; non-metallic seal (54) mounted at sealing cavity, extending through aperture (52) formed in seal; circuit board (58) mounting being electrically connected end; either socket (68) attached or collar (112) maintaining contact prevent from contacting board.