Water level in the boiler drum is one of the most important parameters to both measure and control. If the level is too low, overheating of the water wall tubes may cause serious accidents, resulting in expensive repairs, downtime, and injury or death to personnel. If the level is too high, boiler water carryover into the superheater or the turbine may cause damage resulting in extensive maintenance costs or outages of either the turbine or boiler. Controlling the water level requires sophisticated techniques as the level measurement must be accurate and transmitted to the control system.
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