Description: input variable of a comparison element of a control device which is derived from the target variable and defines the desired value of the controlled variable; Name: reference variable
Description: input variable to a comparing element in a controlling system, which sets the desired value of the controlled variable and is deducted from the command variable; Name: reference variable
Description: amount of the absolute value of the total head above the head, equivalent to the vapour pressure of the liquid at the particular temperature, with reference to the NPSH datum plane; Name: net positive suction head