The freezer fails at 2am and somebody knows
Doors, movement and glass, and the things that have nothing to do with intruders — water on a floor, a room getting too warm, a freezer drifting. One system, one alert.
Most of what goes wrong overnight is not a break-in
A pipe letting go over a weekend, a walk-in drifting up through the night, a server room whose cooling stopped on Friday. None of it trips a burglar alarm.
They are the same shape of problem: something changed in an empty building and nobody found out until morning. The sensing differs; the alerting is identical.
So they belong on one system, rather than a burglar alarm plus a separate box for the freezer that somebody stops checking.
Everything arrives at the same place, which is why a freezer drifting overnight reaches somebody the same way a door does.
What the building can tell you
Sensors are the cheap part and the wiring is the expensive part, so the useful question is what you want to hear about.
Doors and windows opening
Contacts on the openings that matter, armed on a schedule, so a door at 3am is an alert and the same door at 8am is not.
Movement in an empty room
Motion sensing that knows opening hours from everything else, rather than one that gets switched off for crying wolf.
Glass breaking
Listens for the sound instead of waiting for someone to cross a beam, which is the difference between catching entry and catching presence.
Water where it should not be
Under a sink, behind a heater, on a plant room floor. The cheapest sensor here and the one that most often pays for the rest.
Temperature drifting
Walk-ins, server rooms and stock rooms watched against a range, with the alert going while there is still time to act.
A log of what actually happened
Every trip recorded with a time, so a question about last Tuesday has an answer instead of a theory.
The panel, the sensing and the thing that makes the noise
The sensors themselves are small white units that disappear into a door frame, which is the point of them. These are the three parts anybody would actually notice.
The panel it all reports to, usually in a cupboard
Watches water, temperature and humidity in one place
Outdoor horn, for when the response has to be heard
How the work runs
What you want to be told about
Written down first, because the sensor list falls out of it. Most people start with two or three things and add later.
A walk of the openings
Doors, windows and the rooms worth watching, plus where the panel goes and whether power and network already reach it.
Sensors placed and paired
Fitted, paired to the panel, and the arming schedule set against when the building is actually empty.
Tested by setting it off
Each sensor tripped deliberately at handover, and the alert confirmed arriving on the right phone.
Questions we get asked
Alerts go to whoever you nominate, on their phone, with a log behind them. Where a monitoring service is wanted that is a separate arrangement and the system supports it.
Yes, and it is one of the more common reasons to fit it. A range is set and the alert goes while there is still time to do something.
Most are wireless and battery powered, so an existing building does not get opened up. The panel needs power and network; the sensors mostly do not.
The panel keeps its schedule and keeps recording locally. Getting the alert out is what needs the line, which is why a second path to the internet often sits alongside this.
Placement decides that. A motion sensor pointed at a vent or a draughty doorway is the usual cause, and it is a survey problem rather than an equipment one.
Name the two things you would want a call about
Not the whole building. The two that would ruin a weekend are enough to size the first version.