When must the licensee replace the fixed temperature sensing elements?

The correct choice highlights that the licensee must replace the fixed temperature sensing elements when the manufacturer's date stamp is over one year old. This is an important practice because temperature sensing elements have a limited lifespan that can affect their reliability and accuracy in detecting fires. If the elements are not replaced according to this guideline, they may fail to perform effectively in an emergency, putting lives and property at risk.

Regularly replacing these components ensures that fire detection systems remain functional and compliant with safety regulations. In the context of fire safety, staying proactive about the condition and age of fire protection equipment can be crucial for preventing potentially disastrous incidents.

The other options suggest various, but less appropriate timings for replacing these elements. Regular maintenance is essential, but it does not specifically address the timing related to the manufacturer's date stamp. Damage is a clear reason for replacement, but relying solely on this would neglect the preventive aspect that is necessary for effective fire safety. The five-year guideline could be misleading since it does not take into account the age of the sensing element and may not align with the manufacturer’s recommendations. Thus, adhering to the one-year date stamp rule is essential for maintaining both safety and compliance.