AMIKON / Machinery Monitoring Emerson A6220 Shaft Eccentricity Vibration Monitor AMS 6500 Machinery Health Monitor · Rotating Machinery Protection A6220 Dual-channel monitoring 1-slot plug-in module API 670 Product Overview The Emerson A6220 is a shaft eccentricity monitor for large sleeve-bearing rotating machines. It uses a non-contact displacement sensor to measure shaft movement associated with shaft bowing or a bent shaft, including at speeds below 600 rpm. Configurable