The gas alert countdown is an optional gas feature that creates a short delay before a high-gas alert is delivered to Blackline Live and to monitoring personnel.

This feature helps prevent false alarms from being delivered to monitoring services. Gases like CO and O₂ can spike and dip very quickly, initiating a high-gas alarm even when gas levels go back to normal.

Typically, when EXO’s high-gas threshold — determined in the configuration profile — 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 create false-alarm scenarios 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, EXO waits for the configured amount of time before sending the alert. EXO continues to display red lights and a high-urgency notification sound, so the user knows to leave the immediate area.

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

The gas alert countdown feature is turned off by default.