A school gate works in the busiest, least controlled environment in the building. Students arrive in a rush, staff rotate, and the equipment has to be understood in seconds by whoever is standing next to it. The wrong choice is rarely dramatic — it just produces constant alarms until someone switches the gate off.
These are the decisions that actually determine which walk-through detector a school should install, in the order they should be answered.
1. The One Question That Decides the Model
Before zone counts or screen size, settle this: must the gate separate phones and electronic devices from everyday metal?
A standard metal detector alarms on any metal above the threshold. That is enough for weapons screening — but in a school it also means every bunch of keys sets it off, and it cannot answer the question schools ask most often: is this student carrying a phone?
An electronic device detection mode changes the job of the gate. It detects a mobile phone in any state — powered on or off, with or without a SIM card — as well as laptops, tablets, digital cameras and camcorders, while filtering out the metal students carry every day: coins, glasses, watches, belt buckles, keys, lighters and similar items.
If your school needs that distinction, choose a gate with the mode built in. If metal screening alone is enough, you can stay with a standard model and spend the difference elsewhere.
2. Detection Zones and Sensitivity
Zones decide how much information the alarm carries. Fewer zones give a simple “something was detected”. More zones tell the operator roughly where on the body the object is, which shortens the second check and keeps the morning queue moving.
- 6 / 12 / 18 zones, selectable — the flexible standard range. Match the setting to the entrance instead of buying capacity you will never use.
- 25 zones and above — a body map rather than a single alarm, with 360° indication. Useful where several hundred students pass in a short window.
Sensitivity should be adjustable per zone. Schools are full of metal that has nothing to do with the screening policy — handrails, lockers, shoe eyelets, belt buckles. A per-zone range lets staff tune the gate to its actual environment after installation instead of accepting a factory preset that alarms all day.
The most common cause of false alarms is not a faulty detector — it is a gate that was never adjusted for the entrance it was installed in.
3. Passage Width, Weight and Power Consumption
These three numbers matter more in a school than they do in a warehouse:
- Passage width. Students carry backpacks, instrument cases and sports bags. Both configurations below provide around 720 mm of internal width, which keeps the arrival queue moving.
- Net weight. Schools often install gates in older buildings, on finished floors, or in entrances that are reconfigured each term. The standard model weighs 50 kg; the intelligent one 84.6 kg. The lighter unit is easier to re-position and service.
- Power consumption. A gate at the main entrance runs all day. Both models stay under 22 W — the standard one under 12 W — which is a measurable difference on a school’s electricity bill over a year.
4. Two Configurations That Cover Most Schools
In practice, school projects land in one of two places. Both configurations below are built for the same traffic — they differ in what the gate has to tell you.
PE-Multi Z810
Intelligent walk-through detector · 10.1″ touchscreen
- Electronic device detection mode: finds a phone whether it is on, off, or without a SIM card, plus laptops, tablets and cameras.
- Also offers all-metal, prohibited-items, and electronic + prohibited-items modes — selectable on the gate.
- ≥25 detection zones with 360° alarm and location lights on all four sides: staff see where the alarm is, not just that there is one.
- 0–500 sensitivity levels per zone, with 24 preset application scenarios — the school setting can be selected in one step.
- 10.1″ LCD touchscreen (dual-screen optional) and 100 alarm tones, so several gates can be told apart by sound.
- Stores ≥100,000 records with power-off retention; interlock output for turnstiles, access control or an X-ray scanner.
- Under 22 W, with an energy-saving sleep mode for quiet periods.
PE-Multi 518
Standard walk-through detector · 720 mm passage
- A 720 mm passage — the widest of the standard range — so students pass through with backpacks without slowing the queue.
- 6 / 12 / 18 detection zones, selectable to suit the entrance; 0–255 sensitivity levels, adjustable per zone.
- At maximum sensitivity it detects metal from about 6 g, with audible and visual alarms.
- High-brightness LED display with dual-row zone alarm indicators, and a four-button keypad staff can operate without training.
- Alarm volume adjustable across 0–199 levels, plus a size recognition function that distinguishes larger metal objects.
- Net weight 50 kg and under 12 W — easy to move and negligible to run.
- Optional LAN-based centralised management, battery backup during power cuts, four-side 360° alarms and a development port.
| For a school entrance | PE-Multi Z810 | PE-Multi 518 |
|---|---|---|
| Best suited to | Entrances where phones and electronic devices must be detected | Everyday metal screening where a wide passage matters |
| Detection modes | Electronic device / all-metal / prohibited items / electronic + prohibited items | Multi-zone metal detection |
| Detection zones | ≥25 zones | 6 / 12 / 18 zones, selectable |
| Sensitivity | 0–500 levels per zone | 0–255 levels per zone |
| Detection capability | Phones in any state, laptops, tablets, cameras; filters daily metal items | Metal from about 6 g at maximum sensitivity |
| Display and control | 10.1″ LCD touchscreen, dual-screen optional | High-brightness LED display, four-button keypad |
| Passage width | 727 mm | 720 mm |
| Net weight | 84.6 kg | 50 kg |
| Power consumption | <22 W | <12 W |
| Preset scenarios | 24 | — |
How to decide: if the answer to the first question is “yes, we need to find phones”, the Z810 is the configuration to quote. If the school needs a dependable metal alarm, a wide passage and the lowest cost, the 518 covers it — 720 mm of internal width in a 50 kg frame.
5. Installation Conditions to Check Before Ordering
A walk-through detector needs a metal-free installation area on both sides and beneath it. The stated installation environment for the 518 is a horizontal metal-free distance of 100 cm wide × 200 cm long. Beyond that:
- Avoid placing the gate beside large moving metal structures — rolling shutters, motorised gates or heavy railings — which affect stability.
- Both models use low-field technology, which is safe for wearers of pacemakers and for pregnant women, and does not damage magnetic media.
- Confirm the route students actually walk. A gate that forces a detour through a corridor gets bypassed.
Summary
Start with the screening policy, not the specification sheet. If the gate must separate phones and electronic devices from everyday metal, the Z810 answers that with ≥25 zones and a 0–500 sensitivity range. If a dependable metal alarm at the lowest cost is what the school needs, the 518 covers it with 6/12/18 selectable zones and a 720 mm passage in a 50 kg frame. In both cases, check passage width and the metal-free installation area before the order goes out.