Blue-White’s FLEXFLO A-100NV Variable Speed Peristaltic Pump is offered with the Micro-Flow FVS (Flow Verification Sensor). With this option the pump’s electronics continuously monitor the Micro-Flow to ensure chemical injection. If chemical fails to inject, the pump will stop and an alarm relay will close, allowing remote alarm indication or initiation of a backup pump.Email: sales@blue-white.comWebsite: http://www.bluwhite.com