The Gilian GilAir Plus is equipped with QuadModeSM Air Sampling Technology performing high-flow constant pressure and constant flow and low-flow constant pressure and constant flow without external adapters. The pumps wide dynamic flow and pressure ranges address all personal air sampling methods with flow ranges between 1 5,000 cc/min. GilAir Plus delivers the reliable performance users expect from the Gilian brand. The pump has high back-pressure capability of up to 40 H2O in high-flow and up to 25 H2O in low flow. An automatic self check system ensures sample accuracy by continuously monitoring pump performance and components. The selectable automatic fault recovery feature provides restart in the event the sample tubing becomes crimped or briefly blocked. This feature attempts to restart the pump up to 10 times every 3 minutes to check if the block cleared, fault time is not added to the accumulated and displayed sample runtime. Automatic fault recovery can be disabled if desired