Radar, Infrared or Foot Sensors? Choosing Activation for Hospital Doors
Every automatic hospital door is only as good as its activation logic. The right sensor lets staff pass with full hands and keeps sterile zones untouched; the wrong one creates contact points, false openings, or - the expensive one - doors that hang open in rooms that are supposed to hold pressure.
Radar motion sensors: the default, for good reasons
Radar detects approaching movement and opens early, which keeps traffic flowing - exactly what a corridor door needs. Its known weakness is indiscriminate triggering: a radar facing a busy corridor will open for every passer-by. The fix is aiming and zoning: doppler radar pointed at the approach path, masked away from cross-traffic, mounted at the height the manufacturer actually specified.
Infrared presence sensors: the safety net
Infrared curtains and presence sensors do a different job - they detect who is already in the doorway and hold the leaf. EN 16005 logic pairs them with radar for exactly this reason: radar opens the door, presence protects the person standing in it. A door sold with radar alone is a door that will close on a slow trolley eventually.
Foot switches and kick sensors: the sterile team's answer
Once hands are scrubbed or gloved, nobody wants to touch anything. A foot switch or low kick sensor lets staff open the door with a boot while carrying instruments. Cheap, mechanical, indestructible - and on theatre and treatment room doors, worth more than any sensor upgrade. The failure mode is placement: too close to the door and trolleys trigger it accidentally, too far and it is useless.
Wave and touchless switches
A short-range touchless switch opens on a deliberate hand wave - no contact, and no accidental triggering by passers-by. The right choice for drug rooms, stores and cleanroom gowning doors where a radar would fire all day. Physical touch switches still have a place as backup and for visitors who wave at everything else first.
Access control readers
Card and keypad readers are not sensors but they complete the activation picture: they decide who may trigger the door at all. Typical hospital placements - drug rooms, implant stores, NICU, theatre complexes after hours. The design rule that matters clinically: free exit on the inside, always, regardless of what the outside reader demands.
Choosing the mix per door position
- Theatre main door: radar + presence + foot control. The full set, because both traffic and sterility are critical.
- Ward and corridor doors: radar + presence on automatic sets; elbow handles on manual ones.
- Isolation rooms: radar with a hold-open limiter, so the door cannot be left casually open defeating the pressure regime.
- Drug and equipment stores: wave switch or card reader outside, free exit inside.
Commissioning the sensors, not just installing them
Sensors are adjusted, not just fitted. Walk-test every approach angle with a bed, a wheelchair and a person walking slowly. Check the door does not open for cross-corridor traffic. Verify the safety field holds the leaf for someone stopped mid-threshold. Ten minutes of walking beats a year of swiping at motion sensors with frustration.
The sensor package is a few percent of the door's cost and all of its manners. Spend accordingly.
Configuration table by door position
- Theatre main door: radar + presence + foot control, hold-open limiter, battery backup - the full clinical set.
- Theatre secondary / staff door: foot or touchless switch, no radar (no public traffic to serve).
- Ward automatic doors: radar + presence; mask the radar away from cross-corridor flow.
- Isolation room door: radar with hold-open alarm, presence inside and out - sealing discipline beats convenience.
- Drug / equipment stores: touchless wave or card reader outside, free exit inside.
- Cleanroom gowning boundary: interlock-governed operation with touchless or foot activation inside.
Troubleshooting the five complaints we hear most
- "The door opens by itself." Radar sees cross-traffic or a moving object - re-aim and re-mask; the sensor is honest, the zoning was hopeful.
- "The door opens late." Detection angle or mounting height drifted from spec - remount per the manual, then walk-test with a bed, not a nod.
- "The door closed on my trolley." Presence sensor misaligned or its sensitivity trimmed down during a nuisance phase - restore the safety field and re-test with the widest trolley in the building.
- "The foot switch triggers when trolleys pass." Placement - move it out of the traffic line and angle it to a deliberate step, not a shuffle.
- "The wave switch opens for mops leaning nearby." Range limit set generously at install - tighten the field to an arm's length and the mops lose their authority.
FAQ
Which sensor is best for hospital doors?
The honest answer is a package, not a component: radar for approach, infrared presence for safety, foot or touchless for sterile access, card readers where access must be earned. The room's traffic decides the mix.
Are radar sensors hygienic?
They are the hygiene upgrade - nothing touches anything. The surfaces that matter clinically are the ones sensors remove from the handshake entirely.
Do foot switches survive wet cleaning?
Specified ones do - mechanical kick plates and IP-rated foot switches are built for mop country. Choose the heavy-duty variant for theatres and CSSD; the light-duty office version is a false economy.
Can sensors work with gloves and PPE?
Radar and presence detect mass and motion, not skin; capacitive or infrared touchless switches fire on a gloved hand as happily as a bare one. PPE is exactly the use case.
What maintenance do door sensors need?
Clean lenses monthly, verify zoning quarterly with the walk-test, and log adjustments. Sensor drift is gradual - the log is how a door that "still works" keeps actually working.
Why the argument about sensors is really about workflow
Every sensor dispute traces to a workflow nobody wrote down. The door that "opens too much" serves a corridor nobody intended as a waiting area; the foot switch that "never works" was mounted for a different generation of trolley. Write the traffic story first - who passes, carrying what, how often, hands free or not - and the sensor package chooses itself. The technology is the easy part; the choreography is the specification.
Can one door carry radar, foot and card control together?
Yes - common on theatre complexes: radar for beds, foot for the sterile team, card for after-hours perimeter security. The control cabinet orchestrates priority; the commissioning walk proves it in the order the ward actually uses.
What happens to sensors during a power cut?
Activation moves to battery-backed operation per the operator specification, with stated cycle counts; manual escape remains independent of all electronics. Sensor strategy is designed to fail into safety, not into silence.
Do sensors interfere with each other on adjacent doors?
Rarely, when zoning is respected - mounting heights and detection fields per manual keep neighbours polite. The corridor that fights its doors usually has one sensor aimed at another's territory.
What is the lifespan of door sensors?
Solid-state units serve years; lenses gather film and mounts drift long before electronics fail. The maintenance round replaces a cloth wipe and a walk-test for a replacement budget - a good trade.
Sense the approach, protect the person, respect the sterile hand. The sensor package is the door's manners - install them accordingly.
