Refer to the drawing of a lube oil temperature control system (see figure below).
A direct-acting proportional temperature controller is being used to control the heat exchanger lube oil outlet temperature.
When the lube oil outlet temperature matches the controller setpoint of 90°F, the controller output signal is 50 percent.
Current lube oil outlet temperature is stable at 100°F with the controller output signal at 70 percent.
What is the temperature proportional band for this controller?
A. 90°F to 140°F
B. 90°F to 115°F
C. 65°F to 140°F
D. 65°F to 115°F
Show Answer
Answer: D
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