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 will turn on at a system pressure of 100 psig.
The bistable has a 5 psig deadband, or neutral zone.
If system pressure is currently 98 psig, which one of the following describes the status of the alarm?
A. The alarm is not actuated.
B. The alarm is actuated and will turn off at 95 psig.
C. The alarm is actuated and will turn off at 105 psig.
D. Additional information is needed to determine the status of the alarm.
Show Answer
Answer: D
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