The Electronic Devices ED811 Gas Detector Instruction Manual provides installation, calibration, safety and operation guidelines.
This manual describes the ED811 fixed‑installation gas detector, an intrinsically safe ATEX/UKCA certified device for detecting flammable and toxic gases. It outlines essential safety requirements, certification details, and the proper handling of the built‑in Zener barriers (type ZB1).\n\nThe guide covers control‑unit mounting, sensor wiring, installation steps, calibration procedures, engineering override, and maintenance. It also includes specifications for sensor cable capacitance, relay ratings, and recommended calibration intervals.
| Input voltage | 110V AC/220V AC/240V AC |
|---|---|
| Maximum voltage (Um) | 250V |
| Relay contact rating | 2A at 240VAC |
| Maximum sensor cable capacitance | 6.8 µF (EDS/C & EDS/P) or 8.8 µF (EDF sensor) |
| Zener barrier type | ZB1 |
Calibration should be performed after installation, then at least every twelve months with regular checks in between.
No, the Zener barrier fuses are potted in epoxy and are not replaceable.
The total capacitance must not exceed 6.8 µF for EDS/C and EDS/P sensors, or 8.8 µF for EDF sensors.