Liquid nitrogen and argon do not poison anyone; they push the oxygen out of a room without any sign. An oxygen detector at breathing height near the entrance alarms at the door before someone walks into a depleted room, and reports over cellular.
Nitrogen and argon have no smell and no colour, and a depleted atmosphere gives no sensation of breathlessness before it disables.
A litre of liquid nitrogen becomes hundreds of litres of gas, so a dewar or a leak can deplete a small room.
Laboratories and freezer rooms are often entered by one person.
| Target gas | Oxygen (O2) |
|---|---|
| Selectable ranges | 0-30 / 0-100 %VOL |
| Mounting height | Breathing height, about 1.5 m, near the entry to the space |
| Where the detectors go | At breathing height near the room entrance; near dewars, tanks and freezers; outside the door, as a repeater alarm |
| Outputs | Two alarm relays, 4-20 mA and RS485 Modbus RTU, all at once |
| Reporting | RS485 into a Genesis controller, then over cellular to alerts and a record |
The detector relays switch the fan, close the valve or sound the beacon locally, with no network involved.
The same reading goes over cellular to the people on the alert list, wherever they are, with acknowledgement recorded.
Concentration, time and duration are kept on a record that exports to Excel, for the incident review and the next inspection.
Because oxygen is what people need to breathe. An oxygen detector reports depletion whichever inert gas caused it.
Which gases, how many points, where they sit and what they report into. We come back with the cells, the ranges and the positions.
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