Why might the 2nd floor PI turn on and then quickly extinguish?

To understand why the 2nd floor PI (Pressure Indicator) might turn on and then quickly extinguish, it's essential to consider the behavior of indicators in response to pressure levels and how they interact with the system's design.

The likely explanation for the indicator turning on and then extinguishing quickly could be due to transient fluctuations in the pressure level. In a pressure monitoring system, if the pressure rises briefly above the threshold that activates the indicator and then quickly falls back below that threshold, the indicator will turn on and then off again in response to these changes.

The choice that suggests X1 with a ratio of 4/6 indicates a situation where the conditions under which the pressure indicator operates may require a slight fluctuation to trigger, further supporting the idea that a brief overpressure condition might be occurring.

Understanding the context of the system is crucial. For instance, if the system is experiencing routine pulsations or short cycles of pressure changes, this can easily lead to the indicator activating momentarily before stabilizing again.

Therefore, the analysis of the pressure fluctuations and the operation thresholds in relation to the selected answer aligns with the behavior of the indicator, confirming why that particular choice is valid in explaining the phenomenon observed.