Sep 26, 2026Sensor & Safety Notes
Carpet Pad Sensors and Pressure Mats: When Floor Sensing Beats Overhead
Floor-level sensing detects what overhead sensors miss: a person standing still, a child at the threshold, a wheelchair. Where carpet pad sensors are the right answer.
Most automatic doors are triggered from above. Overhead sensing is convenient and invisible, but it has a blind spot the size of the doorway floor, and that is precisely where a person can stand while the door tries to close. Floor-level sensing addresses that blind spot directly.
How a carpet pad sensor works
A carpet pad sensor is a pressure-sensitive mat placed in the threshold area. It detects weight on the floor rather than movement in the air, so it responds to a person standing still, which motion sensing by definition does not. When someone steps on or stands on the mat, the operator is told to hold or reopen the door.
What floor sensing detects that overhead sensing misses
Three cases come up repeatedly. A person who has stopped to talk, read a sign or wait for a companion produces no motion for an overhead sensor to detect, but stands on the mat continuously. A small child or a low object may sit below a beam aimed at adult height but press on the floor. And a wheelchair or trolley occupies floor space without necessarily producing the movement signature an overhead sensor expects.
Where it fits
Carpet pad and pressure mats suit doors where the threshold is the real risk area: hospital and care entrances, doors used by people with restricted mobility, entrances where queues form in the doorway, and installations where an overhead sensor cannot cover the threshold cleanly. They are also useful as a second layer alongside overhead sensing, covering the floor while the overhead units cover the approach.
What to confirm
Confirm the mat size relative to the opening, because the detection area is the mat itself; a mat narrower than the doorway leaves unprotected floor at the edges. Confirm the load range suits the traffic, since a mat set for pedestrians may not respond as intended to a trolley. Confirm the mechanical construction suits the floor and the traffic that crosses it, and confirm the operator has an input the mat can drive. For outdoor or damp positions, verify the mat is suitable for the location rather than assuming an indoor product will cope.
Floor sensing alongside overhead sensing
The two approaches cover different volumes and fail in different ways, which is why pairing them works well. Overhead sensing covers the approach and can act early, starting the door as somebody nears it. Floor sensing covers the threshold and acts on weight, which means it remains reliable for someone who is standing still, low down, or moving without a detectable movement signature.
A door using only overhead sensing is generally fine with brisk, uncomplicated traffic. A door using only floor sensing reacts later, because the person is already at the threshold when the door begins to open. Together, the approach is sensed early and the threshold is protected continuously.
Floor construction and the mat
A pressure mat is only as good as the floor it sits on and the way it is fixed. Uneven or resilient floor finishes change how weight transfers into the mat, and a poorly secured mat can move or ruck under traffic. Confirm the mat suits the finished floor and the way it will be fixed, and confirm the cable route from the mat is protected, since the vulnerable point of any floor sensor is where it leaves the floor.
Where the doorway sees vehicles, trolleys or heavy deliveries as well as pedestrians, the mat's construction and load range deserve as much attention as the detection logic. A floor sensor that survives is one that was chosen for the traffic it actually meets.
Frequently asked questions
Can a carpet pad sensor replace overhead safety sensing?
It complements rather than replaces it. Floor sensing covers the threshold and people standing still; an overhead curtain covers the approach and the leaf path. Most doors are safest with both.
Will a pressure mat wear out?
Like any mechanical device it has a service life that depends on traffic and construction. Choosing a mat rated for the footfall it will see, and planning for replacement, is more realistic than expecting an unlimited life.
AURWEN supplies carpet pad sensors and door accessories alongside its sensing range. Tell us your threshold and the traffic it sees and we will suggest a floor-sensing approach.
