Indexed centering spacer for coaxial probes in guided wave radar level transmitters

摘要: Coaxial probes for guided wave radar level transmitters have an inner rod within outer tube. Transmission line impedance changes where the space between two fills with process fluid, causing a reflection of energy. Time flight calculations yield distance to product and thus fluid in tank. The should maintain their spacing because can occur if moves too close tube wall. Spacers spacing. spacers be retained so that location over time doesn't change. Retention strategies involving shoulders or discontinuities cause measurement errors. Applications requiring high temperature resistance chemical compatibility lead ceramic instead plastic spacers. Slip fits are needed when ceramics stiff snap-in functionality.