Hydrogen sulfide forms wherever wastewater sits without oxygen, and it deadens the sense of smell at the concentrations that matter. Fixed detectors at the inlet works, wet wells and sludge areas trip local alarms and report over cellular, so the plant knows before a worker does.
Inlet works, wet wells, sludge tanks and covered channels collect it.
Above low concentrations it deadens the sense of smell, so a worker stops noticing it.
H2S attacks concrete and metal, so a rising baseline is a maintenance problem as well as a safety one.
| Target gas | Hydrogen sulfide (H2S) |
|---|---|
| Selectable ranges | 0-10 / 20 / 50 / 100 / 500 / 1000 ppm |
| Mounting height | Low, 0.3 to 0.6 m above floor level: the gas is heavier than air |
| Where the detectors go | Low near inlet works and screens; at wet wells and sumps; in sludge handling buildings |
| 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 low ranges suit occupied areas, where set points sit at a few ppm. The 500 and 1000 ppm ranges are for process gas streams.
The NIOSH Pocket Guide lists a recommended exposure limit of C 10 ppm (15 mg/m³) [10-minute], an OSHA permissible exposure limit of C 20 ppm 50 ppm [10-minute maximum peak] and an IDLH of 100 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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