Yokogawa PR4A-S-10 Retractable Conductivity Sensor

The Yokogawa PR4A-S-10 Retractable Conductivity Sensor Assembly enables continuous in-line conductivity measurement with a through-the-valve retractable design that lets you insert or remove the Sensor under pressure without shutting down the process. Built with stainless steel AISI 316 wetted parts and designed to mate with Yokogawa SC4A conductivity sensors, it supports threaded, flanged, or ball-valve mounting for pipeline or vessel installations. The -10 suffix provides a 1.0 meter insertion length, with static pressure rating up to ~1 MPa, operation during maintenance up to ~500 kPa, and a temperature range up to ~100–110°C depending on operating conditions. Key features include adjustable insertion depth, a safety locking mechanism, and an O-ring sealing system, and the unit is commonly deployed for water and wastewater treatment, chemical processing, and power generation; it is also listed as a common replacement for the Yokogawa PR4A-T-10 (titanium version) and the PR10 retractable assembly.