What must the fixed temperature sensing elements of fusible metal alloy type bear when replaced?

The requirement for fixed temperature sensing elements of fusible metal alloy types to bear the manufacturer's date stamp ensures that the components can be properly tracked for safety, performance, and maintenance purposes. This date stamp provides critical information regarding the age of the sensing elements, which is essential for determining their reliability and service life. Knowing when these components were manufactured helps in assessing whether they are still compliant with safety standards and regulations.

In the context of fire safety equipment, maintaining an accurate record of when parts were produced enables technicians and inspectors to ensure that all components of a fire suppression system are functioning optimally and have not surpassed their recommended lifespan. This focus on date tracking reflects a commitment to safety and regulatory compliance within fire protection systems.