Refer to the drawing of a pressure alarm circuit (see figure below).
The orientation of the bistable symbol indicates the characteristics of the bistable, as is normal for a control circuit diagram.
The bistable turns on to actuate an alarm at a system pressure of 100 psig.
The bistable has a 5 psig deadband, or neutral zone.
If system pressure increases to 105 psig, and subsequently decreases to __________; the status of the alarm will be __________.
A. 100 psig; off
B. 98 psig; off
C. 94 psig; on
D. 92 psig; off
Show Answer
Answer: D
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