I have used these:

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GLS-OIRLCL-C-CN

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with some success.? It is possible to ceiling mount it and cover part of the sensor window with tape to adjust the sensing area.? ?It also has some sensitivity adjustment.

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I kind of like the camera thing as it could cover multiple trigger areas.? The only problem with it is the trigger line will vary with the height of the occupant unless the ceiling is really high.

Thanks Adam.

Unfortunately, I'm not trying to determine if someone is in a room but in a specific location within the room.? Hence my need to determine if someone is within a foot of the sensor. The need to carry a smart phone is also an issue.

Thanks again.

Jay