What must a fixed temp-sensing element of a fusible metal alloy type have when replaced?

When a fixed temp-sensing element of a fusible metal alloy type is replaced, it is essential for it to have a manufacture date stamp. This is critical because the date stamp indicates when the component was produced, which is necessary for determining its suitability and compliance with safety standards. Components can degrade over time, and understanding their age helps in assessing their effectiveness and reliability in fire suppression equipment.

The presence of a manufacture date stamp ensures that the element is within an acceptable time frame for usage, aligning with maintenance guidelines and regulatory requirements. This practice helps ensure that the safety equipment is functioning correctly and is not inadvertently using outdated materials that may not perform as intended in an emergency situation.