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INSTRUMENTATION AND CONTROL Module 7 Process Controls

INSTRUMENTATION AND CONTROL Module 7 Process Controls

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process variable or variables, then causes some action to occur to maintain the desired system parameter. In the example of the central heating unit, the system monitors the temperature of ... and adjusting a supply valve to add more or less water to the tank. The desired level is preset by an operator, who is not part of the system. Figure 2 ...

  Process, Valves

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