Which of the following does NOT represent an indicator in the alarm system?

The indicator in an alarm system is intended to provide information about the status or presence of a hazard, which can be communicated through various means. Visual alerts—such as flashing lights—draw attention to an issue, while audible alerts, like alarms or beeps, signal hazards that may need immediate attention. Electronic readings can indicate specific measurements or conditions, like pressure or flow rates, relevant to the operation of medical gas systems.

In contrast, a mock signal does not serve a functional purpose within an alarm system; it is typically a simulacrum that may be used for training or demonstration without conveying actual data or indicating a real condition. Therefore, it does not qualify as an indicator of alarm status or system health. Understanding the function and purpose of each type of alert in an alarm system helps clarify why a mock signal is not considered an actual indicator.