Yokogawa has developed the Yokogawa PR10 retractable sensor fitting. The sensor has been designed for online process applications where the sensor has to be removed safely without interrupting process continuity such as anaerobic, toxic or pressurised environments. The PR10 is suited to pH, ORP, conductivity, inductive conductivity and dissolved oxygen measurements. The unit is available with a wide range of adaptors, ball valves and flanges, and the insertion depth can be adjusted to achieve optimum measurement conditions. Total disassembly without interruption to the process is possible when the ball valve is closed, and safe retraction is possible at pressures up to 5barG. The PR10 will accommodate most commercially available pH electrodes with PG 13.5mm thread or DIN connections, as well as Yokogawa’s SC4A conductivity and ISC40 inductive conductivity sensors, which has a built-in protection cage. For dissolved oxygen measurements, the Yokogawa-Hamilton Visiferm, Oxyferm and Oxygold sensors can be installed. These sensors are typically used in nitrogen blanketing applications, where the optional flush port will allow regular moisturising of the sensor to prevent the membrane from drying out. Applications for the Yokogawa PR10 include the chemical industry, power plants, pulp and paper manufacture, water and effluent treatment, pharmaceuticals and the semiconductor industry.
