When the differential air is 0.05 MPa or less (The tip of the indicator is just visible.) When the differential air is 0.1 MPa or more (The indicator is completely up to the top.) Replace the element when the element service indicator’ s red indication reaches completely to the top. The top of the indication window shows differential pressure of approximately 0.1 MPa. Replace the element after two years of use, even if the element service indicator’ s red indication does not reach the top. The element service indicator is shipped mounted to the micro mist separator with pre-filter, and cannot be retrofitted or used individually. Clogging Indication 18 Series ID G �ｮA IDG�ｮA/IDG Series Reduced purge Membrane Air Dryer Unit Type M V Made to Order Model Selection Single Unit Type Specific Product Precautions Unit Type