Ammonia is an efficient refrigerant and a toxic gas, and a machinery room is where a release starts. Fixed detectors high in the room switch the ventilation on their own relays and send the reading over cellular, so a small leak is found while it is still small.
Industrial refrigeration holds its ammonia in the compressors, vessels and valves of one machinery room.
A release rises and collects under the roof, so detectors at floor level miss it.
From the machinery room a leak can travel to the cold stores and production areas around it.
| Target gas | Ammonia (NH3) |
|---|---|
| Selectable ranges | 0-50 / 100 / 200 / 500 / 1000 ppm |
| Mounting height | High, 0.3 to 0.6 m below the ceiling: the gas is lighter than air |
| Where the detectors go | Above compressors and valve stations; high in the machinery room; cold stores and production areas next to the plant |
| 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.
The 500 and 1000 ppm ranges suit a machinery room, where the alarm starts ventilation and a shutdown. The low ranges suit the occupied areas around it.
The NIOSH Pocket Guide lists a recommended exposure limit of TWA 25 ppm (18 mg/m³) ST 35 ppm (27 mg/m³), an OSHA permissible exposure limit of TWA 50 ppm (35 mg/m³) and an IDLH of 300 ppm. These are United States values; set alarm points against the rules that apply at your site.
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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