What is the function of a PASS device?

A PASS device, which stands for Personal Alert Safety System, is primarily designed to enhance the safety of firefighters by triggering an alarm if there is no movement detected for a predetermined time, typically around 30 seconds. This feature alerts nearby personnel that a firefighter may be in distress or incapacitated, allowing for a quicker and more effective rescue operation.

The functionality of a PASS device is crucial during fire fighting operations, where conditions can change rapidly, and a firefighter might become disoriented or unable to move due to various hazards. The audible alarm that goes off when the device is activated serves as an important signal to other team members, increasing situational awareness and safety.

The other choices provided do not accurately describe the primary role of a PASS device. While measuring air quality and controlling water flow are important aspects of firefighting equipment, they are not functions associated with the PASS system. Similarly, while enhancing visibility is a critical component of firefighting gear through other means, it is not the purpose of a PASS device.