watlow - Proheat, Inc.
2.1 Basic Elements of Proportional, Integral, and Derivative Control Systems. A
control loop may consist of four or five elements and it may control in an open
loop or a closed loop form. ? Primary Element: senses the Process Variable. A
thermocouple measuring temperature is an example. ? Controller Element: may
or may ...Télécharger watlow - Proheat, Inc. pdf
