What pointer indicates the airflow alarm set point?

What pointer indicates the airflow alarm set point?

• A. Red Pointer
• B. Black pointer
• C. White Pointer
• D. Green Pointer

Answer: (A)

In airflow gauges that use multiple pointers, the alarm threshold is marked with a distinct color so you can spot it at a glance. The red pointer is used for the alarm set point, because red signals alert or danger and needs to stand out. This pointer stays fixed at the value where the alarm will trigger; as the actual airflow shown by the other pointer changes, you can quickly see whether you’re above or below the alarm threshold. The other colors on the gauge simply indicate current flow or reference marks, but they are not used to show the alarm set point.

In airflow gauges that use multiple pointers, the alarm threshold is marked with a distinct color so you can spot it at a glance. The red pointer is used for the alarm set point, because red signals alert or danger and needs to stand out. This pointer stays fixed at the value where the alarm will trigger; as the actual airflow shown by the other pointer changes, you can quickly see whether you’re above or below the alarm threshold. The other colors on the gauge simply indicate current flow or reference marks, but they are not used to show the alarm set point.