BUYING GUIDE · UK STOCK
Wireless Door Sensors for Fire Doors, Docks & Plant Rooms
Every propped fire door, wandering-open dock and unauthorised plant-room visit is invisible until someone walks past. Contact sensors make door state a logged, alertable fact.
Door state is compliance data
Wireless door sensors solve an unglamorous problem with outsized consequences: doors that should be closed and are not. The propped fire door that voids the strategy (see the Fire Safety Act duties on responsible persons), the cold-store door bleeding energy, the plant room that was ‘definitely locked’ — all become logged events with time-stamps and alerts.
The hardware is deliberately simple: a magnetic contact reports every open and close for years on a battery, over LoRaWAN, from doors that have no power and never will. What changes operations is the rules layer — ‘open longer than X’, ‘opened out of hours’, ‘opened while alarm set’ — which turns wireless door sensors from logging into supervision.
The wireless door sensors and companions
Two contact families cover interior and industrial doors; tilt sensing covers hatches and gates; the smart button adds a human signal to the same network.
Interior & fire doorsMilesight WS301 Magnetic Contact Switch SensorThe compact contact for office, riser and fire doors — years of open/close history from a battery.
£38.90 ex VATView →
Industrial & externalMilesight EM300-MCS Magnetic Contact Switch SensorThe larger-gap contact (20–30 mm tolerance) for dock doors, cold stores, gates and racking cages.
£52.37 ex VATView →
Hatches, lids & gatesMilesight EM320-TILT Tilt SensorTilt sensing for the openings contacts fit badly: roof hatches, cellar drops, swing gates, machine guards.
£62.85 ex VATView →
Human-in-the-loopMilesight WS101 Smart ButtonSmart button beside the door: contractor sign-in, hold-open authorisation, or a porter call — one press, logged.
£35.91 ex VATView →
Small-site gatewayMilesight UG63 Mini LoRaWAN® GatewayMini LoRaWAN gateway for a building's worth of doors.
From £98.76 ex VATView →
Estate gatewayMilesight UG65 Semi-industrial LoRaWAN GatewayThe semi-industrial gateway when doors span floors, yards and outbuildings.
From £279.82 ex VATView →Compare devices and prices
| Product | Best for | Connectivity | Price (ex VAT) |
|---|---|---|---|
| Milesight WS301 Magnetic Contact Switch Sensor | Fire doors, interiors | LoRaWAN® | £38.90 |
| Milesight EM300-MCS Magnetic Contact Switch Sensor | Docks, cold stores, gates | LoRaWAN® | £52.37 |
| Milesight EM320-TILT Tilt Sensor | Hatches, tilting openings | LoRaWAN® | £62.85 |
| Milesight WS101 Smart Button | Sign-in / call button | LoRaWAN® | £35.91 |
| Milesight UG63 Mini LoRaWAN® Gateway | Building gateway | LoRaWAN® gateway | From £98.76 |
| Milesight UG65 Semi-industrial LoRaWAN Gateway | Estate gateway | LoRaWAN® gateway | From £279.82 |
The rules that make door data useful
Buy by gap and duty: the WS301 suits aligned interior doors; the EM300-MCS tolerates the bigger, rattling gaps of dock and external doors and the knocks of industrial life. Then write the rules before installation — a door sensor without rules is a diary nobody reads. The four that earn their keep: held-open beyond a threshold (fire doors, cold stores), out-of-hours opening (plant rooms, roof access), opened-during-alarm, and never-opened-by-inspection-time (your daily fire-door check, automated into evidence).
Fire-door monitoring deserves its own note: responsible persons must ensure fire doors work and stay closed, and periodic walk-checks sample a moment in time. Wireless door sensors give the continuous record — which doors get propped, when, for how long — that turns enforcement conversations from anecdote into pattern, and the fix from blanket memos into targeted action.
- WS301 for aligned interior doors; EM300-MCS for gaps, docks and weather
- Held-open alerts are the fire-door and cold-store money rule
- Out-of-hours rules make plant rooms self-supervising
- Tilt sensors cover hatches and gates where contacts fail
- Every event time-stamped — compliance walk-checks become exceptions
- Batteries last years; doors need no power, ever
From one door to an estate
Contacts stick or screw on in minutes; one UG63 gateway carries a building’s doors, a UG65 an estate with yards and outbuildings. Alerts route by rule — security’s phones out of hours, FM’s inbox in hours — and the history exports for fire-safety audits.
Doors rarely travel alone: the same gateway serves server room monitoring (door + climate + leaks), care-home safety (exit doors and wandering) and warehouse monitoring (dock doors + cold zones). Start with the doors that keep you up at night.
Why buy from Indiott
We are engineers first and a shop second. Buy online in GBP from UK stock, or call us on 023 9223 3611 and we will sanity-check your device list before you spend a penny — the right frequency band (EU868), the right probe, the right gateway for the building.
Frequently asked questions
How do wireless door sensors attach to fire doors?
Adhesive pads or two screws, sensor on the frame and magnet on the leaf — no drilling through the door core, so the door’s fire integrity and certification are untouched. Installation is a two-minute job per door during any routine visit.
What battery life should we expect on a busy door?
Years even on high-traffic doors — each open/close event is a tiny transmission. The sensor reports its own battery level, so replacement is a planned maintenance line, not a surprise gap in your compliance record.
Can they integrate with our intruder alarm or BMS?
They run alongside rather than inside it: events flow to dashboards and out via webhooks, MQTT or API to whatever should react — a Teams channel, the CAFM system, or a security workflow. That separation is a feature: no alarm-panel engineering, no BMS points, live in a day.
Do they work on roller shutters and up-and-over doors?
Yes — use the EM300-MCS for shutters with its wider gap tolerance, or the tilt sensor on the curtain or arm where geometry defeats a contact pair. Between the two, there are few openings on an industrial site that cannot be monitored.
Make every door accountable
Send us the door list — fire doors, docks, plant rooms, gates — and we will spec wireless door sensors and rules per door with pricing within one working day.
Next step
Scope it with an engineer.
Tell us the site, the assets and the constraint. You get a bill of materials and a straight answer within one working day.
- A bill of materials sized to your site
- Priced ex VAT, UK entity, no login wall
Rather talk it through? Call 023 9223 3611
Received. An engineer has it.
You will hear back within one working day with the parts, the prices and the lead time. A confirmation is on its way to your inbox.
If it is urgent, call 023 9223 3611.
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