For sites that screen hundreds of people a day — mines, large factories, logistics hubs, bus and truck depots — handheld testing creates a bottleneck that no amount of staff discipline can clear. Wall-mounted, non-contact screening stations exist to solve that specific problem. Here is how they work, where they fit, and what they cannot do.
The throughput problem
Handheld testing has a fixed cost per person: position the device, fit a mouthpiece, take the sample, read it, dispose of the mouthpiece, record the result. Even executed briskly, that is far too slow when three hundred people arrive within a twenty-minute shift change.
The consequences are predictable. Queues form, the shift starts late, and the programme comes under pressure to test a sample of workers rather than all of them — at which point it stops being a control and becomes a gesture. Meanwhile the supervisor running the tests is doing nothing else for the length of the shift change, every day.
How a non-contact station works
A wall-mounted station takes a passive sample: the worker speaks or exhales toward the unit from a short distance, and the sensor reads the air in front of it. There is no mouthpiece and no physical contact with the device.
The unit returns an immediate pass or alert indication — typically a clear visual signal, often with an audible alert — and the next person steps up. A test takes seconds, and because nothing is consumed, there is no mouthpiece inventory to manage and no per-test consumable cost.
Mounted at a turnstile, gate or entrance corridor, the station tests everyone who enters as a condition of entry, which is both more consistent and less confrontational than a supervisor selecting people from a queue.
Integration with access control
The significant operational gain is wiring the station into the site's access control. A pass indication releases the turnstile or door; an alert holds it and notifies a supervisor.
This changes the nature of the control. Screening stops depending on someone watching a display and deciding to act, and becomes a physical condition of entry that applies identically to everyone, on every shift, regardless of who is on duty. It also produces an access log that pairs naturally with the screening record.
Where the station is tied to identity — a badge scan or biometric at the same point — the record links a result to a person automatically, which removes a substantial amount of manual record-keeping.
What these stations are not
A non-contact screening station is a screening device. It is not an evidential instrument, and treating it as one is the main way sites get this wrong.
Passive sampling reads the air near a person rather than a controlled deep-lung sample, and the sensors used are generally optimised for speed and robustness rather than for ethanol specificity. That is entirely appropriate for the job it does — deciding who needs a closer look — and entirely inadequate as the basis for sending someone home.
Anyone flagged should be confirmed promptly on a fuel cell analyzer that responds specifically to ethanol and produces a printed or logged result. Write that escalation into the policy explicitly. A programme that acts on a screening alert alone will lose the first dispute it faces, and deservedly.
Siting and installation
A few practical considerations decide whether a station works well in place.
Position it where the flow of people naturally passes and where a flagged result does not become a public event. A unit immediately in front of a queue turns an alert into a spectacle; a short offset gives the supervisor room to handle it privately.
Respect the specified operating temperature and humidity range. A gate position exposed to direct sun, driving rain or extreme cold will push a unit outside its designed conditions, and readings suffer. Sheltered mounting is worth the extra installation effort.
Consider the ambient air. Passive sampling reads what is in front of the sensor, so mounting a station directly beside a solvent store, a fuelling point or a vehicle exhaust path is asking for trouble.
Plan the escalation path physically as well as procedurally. There should be a nearby place where a confirmatory test can be conducted without the subject standing in the entrance.
Where the economics work
Wall-mount stations pay for themselves on volume. Screening a few dozen people a day, a good handheld and a disciplined supervisor are perfectly adequate. At several hundred a day, the arithmetic shifts decisively: no consumables, no operator time per test, no queue, and consistent application regardless of shift.
They also change what is possible. Testing every person on every shift is impractical with handhelds and routine with a fixed station — and universal screening is both a stronger control and much easier to defend than a process where somebody chooses who gets tested.
Choosing a unit
AlcoBreath's wall-mount range covers this role with the A-450 and A-450 Pro, both built on fuel cell sensing, with the A-450 Pro adding connectivity for integration and record export. For sites wanting non-contact screening without a fixed installation, the AT-7000, AX5 and A-18 Rapid provide the same mouthpiece-free approach in handheld form, and the A19 Chita 1 and Chita 2 batons suit mobile checks around a site.
Whichever you install, pair it with a fuel cell analyzer for confirmation. Used that way — fast universal screening at the gate, specific confirmation before any consequence — a wall-mount station is the lowest-friction way to keep an impaired person off the floor.