Lead-acid batteries release hydrogen as they charge, and a charging room or a UPS room collects it under the ceiling. A detector at the highest point switches the extract fan on its own relay and reports over cellular, so a failed fan is noticed before the gas reaches a flammable mix.
Forklift charging bays and battery rooms release it during charging, most of all on equalisation.
Hydrogen is the lightest gas and gathers at the highest point and in roof voids.
It ignites across a very wide span of concentrations, which is why detection is set well below the flammable limit.
| Target gas | Hydrogen (H2) |
|---|---|
| Selectable ranges | 0-1000 / 2000 / 5000 ppm / 0-4 %VOL |
| Mounting height | High, 0.3 to 0.6 m below the ceiling: the gas is lighter than air |
| Where the detectors go | At the highest point of the room, above the batteries; in roof voids above charging bays; near the extract fan |
| 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 ppm ranges catch a small leak early. The 0 to 4 %VOL range suits areas where a larger release is possible and the alarm is set against the flammable limit.
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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