Water treatment stores chlorine in cylinders and drums in a room most people only enter to change them. Chlorine is heavier than air and settles to the floor. Detectors low on the wall trip the local alarm and the scrubber or fan on their own relays and report the reading over cellular.
Chlorine irritates the airways at a few ppm and is dangerous well before it is visible.
A release flows to the floor and into drains, pits and low rooms.
Chlorination rooms and cylinder stores are visited occasionally, so a leak can run for hours.
| Target gas | Chlorine (Cl2) |
|---|---|
| Selectable ranges | 0-10 / 20 / 50 / 100 / 200 ppm |
| Mounting height | Low, 0.3 to 0.6 m above floor level: the gas is heavier than air |
| Where the detectors go | Low on the wall near cylinders and drums; at the chlorinator and the injection point; at the room entrance, outside the door |
| 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 0 to 10 ppm range is the usual choice for chlorination rooms and cylinder stores. The higher ranges are for process areas where a release would be large.
The NIOSH Pocket Guide lists a recommended exposure limit of C 0.5 ppm (1.45 mg/m³) [15-minute], an OSHA permissible exposure limit of C 1 ppm (3 mg/m³) and an IDLH of 10 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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