Greatford Introduction The purpose of the CEMA Sluice Gate Control Panel at Greatford is to make the most efficient use of the two sluice gates to maintain a desired upstream river level. The Sluice Gates are controlled via a hardwired control panel utilising a Rotork IQ Actuator to drive each Gate. The CEMA Control System has been designed to compare a river retention set-point with an upstream level, which is derived from an Ultrasonic Le

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