sensor conveyor speed

SentinelTM Belt Speed Sensor - Jamieson Equipment- sensor conveyor speed ,SentinelTM Belt Speed Sensor Accurately Monitor Conveyor Belt Speed Monitor Belt Movement u Indicates if belt has stopped moving u Indicates if belt has slipped u Indicates how fast a belt is movingsensor - Conveyor belt speed monitoring - Electrical ...I am new to all this so forgive the dumb rating. I need to monitor the speed of a few conveyor belts, the belts are around 10ft to 50ft long and 3ft wide and has anything from heavy boxes to thin...