The system covers the four ways a room goes down: heat, water, loss of mains, and a fault on the UPS, cooling or suppression that protects it. Further sensors join the same gateway as the room changes.
Overheating is the most common. An air conditioning unit trips or a filter blocks, and the room climbs a degree every few minutes. A temperature tag in the room, and another at the hot side of a rack, reports the climb as it happens and alerts on a limit or on a rate of rise.
Water is the most expensive. A condensate drain backs up or a pipe above the room weeps, and the first sign is often equipment failing. A water leak tag on the floor beside the cooling units, or under a raised floor, reports the moment water bridges its pins.
Power loss is the quietest. The UPS takes the load and the room carries on, while its batteries run down. A power failure tag on the supply to the room reports the loss and the restoration, and a contact tag on the UPS reports when it goes on battery.
The protective systems need watching too. Air conditioning, UPS, generator and gas suppression panels all have alarm outputs, often wired to a local sounder or an old GSM dialler. Each output can be read by a tag and sent as an alert. Suppression and fire panel outputs are supplementary alerts; the panel's own certified signalling stays as it is.
None of this touches the IT network. The tags are battery-powered and transmit over 433 MHz to a ZARC Gateway on site, which has its own 4G link and battery backup. Every tag checks in on a schedule, so a tag that stops reporting raises its own alert.
The dashboard sends alerts by SMS or email, and through an app where required, to named people, with escalation and separate routes in and out of hours. Every event is kept with its time, so the record of what happened, who was told and when it cleared is there for incident reviews and audits.