A door frame metal detector is usually specified by zone count alone - but zone count is only one of four decisions that determine whether the installation actually works on site.
1. Zone count follows your screening goal
Six and eight-zone units are well suited to offices, schools and small venues where the aim is simply to detect a concealed weapon. Twelve, sixteen and eighteen-zone units localise a threat to a precise height on the body, which materially speeds up secondary screening at airports, courts, stadiums and high-security government buildings.
2. Throughput drives the alarm strategy
At high footfall, a detector that alarms too readily creates queues. Per-zone sensitivity control lets you tune out belt buckles and footwear eyelets while still catching blades and firearms.
3. The environment decides the build
Outdoor and semi-covered entries need a waterproof composite panel and a powder-coated frame. Sites near lifts, generators or heavy machinery need multi-frequency selection so that adjacent electrical noise does not cause false alarms.
4. Safety and compliance
Correctly manufactured detectors are harmless to pacemakers, pregnant women, magnetic media and photographic film. Ask for that declaration in writing, along with the ISO certification of the manufacturer.
Our team is happy to review a site drawing and recommend a configuration before you finalise your tender specification.
