Cleanfit retractable sensor assemblies from Endress+Hauser allow for pH, ORP, oxygen and NIR sensors to be installed or removed without any process operation interruption for cleaning, calibration and maintenance. The CPA871 model is designed for the water and wastewater industry and is available with a manual or automatic drive. Manual drive has a self-retaining thread to hold the sensor in any position and can be used for process pressures up to 116 psi. The pneumatic drive can be used for process pressures up to 232 psi. In assemblies with a pneumatic drive, the service and measuring positions of the sensor are detected and reported to monitoring and control systems. 888/363-7377; www.us.endress.com.