AP200 seriesRugged pH/Redox (ORP) sensor systems with rapid temperature response for critical processes 2 Mechanical InstallationIM/AP200 Rev. S 72.2.2 Model AP203 Flanged DIp (Immersion) SystemFig. 2.5 Model AP203 – Removing the Sensor HolderUnscrew sensor guard fromdip tube (see Note below)Open cover and detachcables and jetwash tubing(if fitted) from capRemove the sensor holder from the dip tube using thesensor guard as a tool. Engage the sensor guard lugs in thesensor holder slots. Twist the sensor holdercounter-clockwise to disengage the bayonet lugs from theslots in the dip tube and withdraw the sensor holder.Ensure the O-ring remains clean.Note. Before refitting the sensorguard, clean and regreasethe threads and O-ring. Do not overtighten thesensor guard.