An outside water storage tank is equipped with submerged heaters.
The heaters energize at minimum power when water temperature decreases to 48°F.
If water temperature continues to decrease, heater power will increase directly with the temperature deviation from 48°F until maximum power is reached at 40°F.
If water temperature decreases faster than 1°F/min, the heaters will reach maximum power at a higher water temperature.
Which one of the following types of control is used in the heater control circuit to produce these characteristics?
A. Proportional only
B. Proportional plus integral
C. Proportional plus derivative
D. Proportional plus integral plus derivative
Show Answer
Answer: C
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