PRESENCE & ROOM CONTROL · EUROPEAN PROJECT SUPPORT
People are still in the room. Why did the lights go out?
Walking detection is not the same as seated-work coverage. Check the actual occupied area and the control logic.
Guangzhou-based project contact · English enquiries · Updated
THE SHORT ANSWER
Why do the lights switch off while someone is sitting still?
Check whether the sensor can detect the activity in the occupied area, not just someone walking into the room. Detection coverage for seated work can differ from the advertised movement range. Sensor position, mounting height, furniture and the switch-off delay also matter. For a meeting room or desk area, choose a device with documented presence coverage and test it during normal seated use. Review the control logic and retain a practical manual override. Send a room sketch, ceiling height, sensor model and a description of when the lights go out.
What to check before choosing a solution
Mark where the problem happens
On a room sketch, mark desks, the meeting table, partitions and the sensor position. Note whether the failure happens while people are reading, using a screen, or moving around.
Read the right coverage information
Compare the manufacturer’s presence or seated-work coverage with the installed mounting height. Do not assume the largest advertised movement range describes every activity in the room.
Check the whole control sequence
Ask the project team to review occupancy state, off-delay, time schedules, daylight settings and manual scene overrides together. A sensor can detect correctly while another control rule turns the lights off.
Test normal use and a manual fallback
Check occupied and empty-room behaviour using the agreed settings. Include a normal seated meeting, arrival, departure and a manual light command. Record the result before changing the same settings across multiple rooms.
ILLUSTRATIVE SCENARIO
A project discussion: a long meeting with little movement
People entering a meeting room trigger the lights, but the lights later go out during a presentation. The review needs the seating positions, sensor model and sequence of control commands. The next step might involve placement, coverage or logic; the symptom alone does not identify the fix. This is an illustrative scenario, not a claim about a tested installation.
See a printable room-control brief →A detail you can verify
Use the selected manufacturer’s data alongside the project drawings. The reference below supports the general guidance; it does not certify a proposed product combination.