AP200 seriesRugged pH/Redox (ORP) sensor systems with rapid temperature response for critical processes 2 Mechanical Installation6 IM/AP200 Rev. S2.2 Removing the Sensor Holder2.2.1 Models AP201 Insertion and AP202 Inline SystemsFig. 2.4 Models AP201 and AP202 – Removing the Sensor Holder Open cover and detach cables andjetwash tubing (if fitted) from capTwist cable shroudcounter-clockwise andremoveUnscrew sensor holder retainingnut and remove sensor holderfrom in-line adaptorCheck O-ring is in position,located on underside ofelectrode holder