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 is currently 110 psig, which one of the following describes the alarm circuit response as system pressure slowly decreases to 90 psig?
A. The alarm will actuate at 100 psig and will not turn off.
B. The alarm will actuate at 100 psig and will turn off at 95 psig.
C. The alarm is currently actuated and will not turn off.
D. The alarm is currently actuated and will turn off at 95 psig.
Show Answer
Answer: A
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