The red light on the HUD indicates which pressure?

The red light on the HUD indicates which pressure?

• A. 4000 psi or 3/4
• B. 1800 psi or 1/3
• C. 2750 psi or 1/2
• D. 2250 psi

Answer: (B)

The red light on the HUD is the low-air warning. It’s designed to alert you when you’re at about one-third of your cylinder’s capacity, which for a typical 5400 psi full cylinder is around 1800 psi. This warning gives you crucial time to plan your exit and get to a safe air source before you run out. Green or other indicators are for higher pressures, signaling that more air remains, while the red light specifically marks the point where you must start exiting or switching to an alternate air supply. So the red HUD signal corresponds to roughly 1800 psi (one-third).

The red light on the HUD is the low-air warning. It’s designed to alert you when you’re at about one-third of your cylinder’s capacity, which for a typical 5400 psi full cylinder is around 1800 psi. This warning gives you crucial time to plan your exit and get to a safe air source before you run out. Green or other indicators are for higher pressures, signaling that more air remains, while the red light specifically marks the point where you must start exiting or switching to an alternate air supply. So the red HUD signal corresponds to roughly 1800 psi (one-third).