Typically, when a device’s high-gas threshold is crossed, the device immediately sends an alert to Blackline Live. This is done so that monitoring personnel can investigate the incident and follow up with the device user to ensure their safety.

Since the alert is sent immediately, it can result in false alarms where monitoring personnel is alerted even though the exposure was momentary, and the device user is back in a safe area.

When the gas alert countdown feature is enabled, the device waits a configured amount of time before sending an alert. G7 still displays high-urgency lights, sound, and vibration so the user knows to leave the immediate area.

With the gas alert countdown active, the banner at the top of the screen shows the remaining time before an alert is sent to Blackline Live. If gas levels return to normal before this time has elapsed, the alert is cleared. The gas exposure remains visible in the device history view on Blackline Live but does not appear as an alert in the Alerts list.