Inside Marathon's 'Smart' Control Panel

A Service Bay That Watches Itself

Marathon’s Smart Control Panel coordinates the bay’s hydrogen detection, ventilation, alarms and designated equipment interlocks. The approved project design defines the monitored components, operating sequence and response setpoints. It supports a layered approach to risk management rather than replacing technician training or facility procedures.

The Smart panel runs in five distinct operating states. Together, they form a continuous safety loop.

Normal Operations Mode

In Normal Operations Mode, the integrated safety systems constantly monitor the gas level inside the enclosure. The panel will alert users to unsafe gas levels and will take corrective action automatically — without waiting for human intervention.

Alarm 1 — Auto-Purge

If the hydrogen sensor reaches the first alarm setpoint, the system shifts into Alarm 1 Auto-Purge mode:

• Auto-Purge mode turns on automatically.
• The exhaust fan speeds up, removing unsafe gas.
• The enclosure is flooded with fresh air.
• Personnel follow the approved facility alarm-response procedure and the vehicle manufacturer's instructions.

Alarm 2 — Full Purge

If, during the auto-purge, hydrogen continues to rise past 25% of the Lower Flammable Limit (LFL), the system escalates to Alarm 2 'Full Purge':

• An Alarm 2 'Full Purge' is triggered.
• The exhaust fan speeds up further and removes the hydrogen.
• The enclosure is flooded with fresh air.
• Power is discontinued to all interlocked equipment inside the enclosure.

This is the response designed to bring the bay back to a safe state in the most demanding scenario.

Critical Systems Fault

If at any point the Smart system detects a 'Critical Systems Fault':

• The alarm sounds and the lights flash until the fan has been repaired or replaced.
• All documented re-start procedures must be followed before the bay returns to operation.

The fault must be addressed and the documented restart procedure completed before normal operation resumes.

Auto-Mode Is Always On

Auto-Mode can maintain an automatic ventilation response outside normal service operation when configured in the approved control sequence. Availability depends on the required electrical supply and operating system components. Operators must use the project documentation to distinguish an operating-mode change from a complete power isolation or maintenance shutdown.

Why It Matters

Hydrogen safety is not a single sensor or a single fan. It is a coordinated, layered response. Marathon's Smart control panel exists so that response is automatic, repeatable, and always on — across our Automotive, Truck & Equipment, and Bus & Fleet Hydrogen Service Bay product lines.