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Instrumentation Diagram: Automatic Shower Temperature Control. Sketch theprocess and instrumentation diagram for an automatic control system to controlthe temperature of the water from a common shower-that is, a system that willautomatically do what you do when you adjust the temperature of the water whenyou take a shower. Use the standard ISA instrumentation symbols given in Ap-pendix A. Identify the measurement (M), decision (D), and action (A) devices ofyour control system.