A 45‑zones door‑frame metal detector (45‑zone DFMD) is a flagship‑grade ultra‑precision multi‑zone screening device built for mission‑critical security guard systems. Compared with 33‑zone models, this top‑tier equipment divides the full‑height archway into forty‑five independent overlapping vertical‑horizontal detection zones, achieving three‑dimensional positioning covering left‑center‑right body segments from head to toe. When concealed metal weapons or forbidden metal articles are detected, corresponding bilateral LED matrix indicators illuminate to show ultra‑fine‑grained height and lateral position of metal threats on human bodies. Security staff can then use a handheld metal detector to pinpoint suspicious spots with minimal scanning scope, maximizing pedestrian throughput at highest‑security checkpoints. Sintronic 45‑zones door‑frame metal detectors have been delivered for overseas security projects including the Colombia shipment reference project.

Core Working Principle of 45‑Zones Door‑Frame Metal Detector

Sintronic 45‑zones door‑frame metal detector adopts advanced multi‑frequency digital pulsed‑induction electromagnetic technology. Massive independent transmitter‑receiver coil pairs are embedded on both sides of the arch frame to form forty‑five separate overlapping detection sections, minimizing detection blind spots across full human‑body coverage. The complete detection workflow is shown below.

1. Power‑on self‑check & multi‑zone magnetic‑field generation

After power‑on initialization and comprehensive self‑diagnosis, each of the forty‑five coil groups generates stable pulsed low‑frequency electromagnetic field, covering different vertical‑horizontal segments across the passage. Operators can configure fully independent sensitivity parameters for every single zone according to strict highest‑security project requirements. Multiple pre‑configured screening profiles are available for quick one‑click scene switching.

2. Magnetic‑field disturbance triggered by metal objects

When a pedestrian walks through the archway carrying concealed metal items, eddy currents will be induced inside the metal. It generates reverse secondary magnetic field and disturbs local electromagnetic field of one or several detection zones. Only receiver coils of disturbed zones capture abnormal signal data.

3. High‑performance DSP signal processing & zone‑targeted alarm trigger

Built‑in high‑performance multi‑core DSP digital signal processor analyzes signal amplitude from each of the forty‑five zones separately. Once the signal exceeds preset sensitivity threshold, the detector activates combined audio‑visual alarm: buzzer beeps, meanwhile the LED indicator lights corresponding to disturbed vertical‑horizontal zones illuminate on both sides of the arch.

4. Reset and prepare for next pedestrian screening

After security personnel finish secondary inspection and handling for alarmed persons, the detector automatically resets all zone status and stands by for the next passing‑through pedestrian.