The off-normal signal for a pressurized water tank device is initiated when pressure changes by how many psi?

The off-normal signal for a pressurized water tank device is initiated when pressure changes by how many psi?

• A. 5 psi
• B. 10 psi
• C. 15 psi
• D. 20 psi

Answer: (B)

Off-normal signaling happens when the monitored pressure leaves its normal operating range. For a pressurized water tank, the system watches the pressure and triggers an alarm or safety signal when the pressure changes by a preset amount from its baseline. Ten psi is chosen because it is large enough to avoid nuisance alarms from everyday fluctuations (like pump cycling or small temperature effects) but small enough to catch meaningful faults such as a leak, valve sticking, or pump issues that would noticeably affect pressure. If the threshold were smaller, you'd get too many false alarms; if it were larger, you might miss early indications of a problem. Hence, ten psi is the practical trigger for the off-normal signal.

Off-normal signaling happens when the monitored pressure leaves its normal operating range. For a pressurized water tank, the system watches the pressure and triggers an alarm or safety signal when the pressure changes by a preset amount from its baseline. Ten psi is chosen because it is large enough to avoid nuisance alarms from everyday fluctuations (like pump cycling or small temperature effects) but small enough to catch meaningful faults such as a leak, valve sticking, or pump issues that would noticeably affect pressure. If the threshold were smaller, you'd get too many false alarms; if it were larger, you might miss early indications of a problem. Hence, ten psi is the practical trigger for the off-normal signal.