A low air pressure switch on a dry sprinkler system serving a parking garage is what type of alarm initiating device?

A low air pressure switch on a dry sprinkler system serving a parking garage is what type of alarm initiating device?

• A. Automatic
• B. Supervised
• C. Alarm initiating
• D. Auxiliary

Answer: (B)

In fire alarm terminology, devices that monitor the status of a system and alert you to conditions that require maintenance are supervisory devices. A low air pressure switch on a dry sprinkler system serves to supervise the charged state of the dry pipe system. When the air pressure falls below a set point, the switch sends a supervisory signal to the fire alarm control panel, indicating the system is not properly charged or is in an abnormal condition. It isn’t an occupant alarm triggered by sensing fire conditions, nor is it an auxiliary indicator; its purpose is to notify that the system itself needs attention to prevent failure.

In fire alarm terminology, devices that monitor the status of a system and alert you to conditions that require maintenance are supervisory devices. A low air pressure switch on a dry sprinkler system serves to supervise the charged state of the dry pipe system. When the air pressure falls below a set point, the switch sends a supervisory signal to the fire alarm control panel, indicating the system is not properly charged or is in an abnormal condition. It isn’t an occupant alarm triggered by sensing fire conditions, nor is it an auxiliary indicator; its purpose is to notify that the system itself needs attention to prevent failure.