Which function shall be tested for each newly installed smoke detector?

When testing a newly installed smoke detector, the smoke entry function is crucial because it directly assesses the detector's ability to sense smoke particles in the air effectively. A smoke detector is designed to respond to the presence of smoke as an indicator of a fire, so ensuring that it can accurately detect smoke is vital for the device's intended purpose of warning occupants and triggering alarm systems.

Testing for smoke entry involves simulating smoke conditions to verify that the detector properly activates. This ensures that the device is not only in working order but also capable of performing its primary function: detecting hazardous smoke from potential fires.

While the power supply, installation integrity, and signal transmission are all important aspects of a smoke detector's operation and should be routinely checked, they do not directly measure the detector's effectiveness in identifying smoke, which is the fundamental role of the detector itself.