The fullest of the three tone sensor sounders: forward and backward scatter, a thermal element, an EN 54-3 sounder. Channels 1, 2, 4 and 5 should all show — the fourth backward scatter, the fifth supervision.
Specify it where a sounding position must also cope with steam or dust: the ratio between two optical readings gives the discrimination algorithm something to work from, which a plain optical sounder has no way to do.
Technical data
| Label marking | O2H/S |
| Sensing and output | Dual-angle optical, heat, tone sounder |
| Analogue channels | 1, 2, 4 and 5 |
| Sound output | 85 dBA at 1 m EN 54-3 average; +3 dB in turbo |
| Standards | EN 54-7:2000 A1:2002 A2:2006, EN 54-5:2000 A1:2002, EN 54-3:2001 A1:2002 A2:2006 |
| Baffle ring | White (sounding) |
Specifications from 4188-1073 issue 3.
Compatibility
Takes the ingress arrangement every sounding S-Quad needs: S4-701 as a kit, or S4-705 retrofitted over an existing S4-700. Where voice rather than tone is wanted from the same sensing set, its counterpart is S4-711-V.
Installation
Tone outputs follow the panel's alarm bands in eight time slots across a two-second cycle, staying synchronised with 34000 sounders and S3 devices elsewhere on the system.
Full details: S-Quad dual optical sensor sounder — installation data — 4188-1073 issue 3 · 28 pages · four-channel O2H/S entry and the synchronisation notes
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