The S4-770-S folds an EN 54-3 sounder into the single-optical multisensor head. Three channels appear at the panel: 1 and 2 for sensing, and 5, which exists to report sounder faults upward.
That fifth channel is why a sensor sounder is not merely a detector with a horn attached — the sound path is supervised, and a failed circuit annunciates as a fault against this address rather than surfacing at the next weekly test.
Technical data
| Label marking | OH/S |
| Sensing and output | Forward-scatter optical, heat, tone sounder |
| Analogue channels | 1, 2 and 5 — the fifth reports sounder faults |
| Sound output | 85 dBA at 1 m EN 54-3 average, or 75 dBA at 3 m at a bedhead; +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
A sounding head must sit on a base carrying an IP21 plate to meet the standards, so order S4-701, or S4-700 with S4-705. Semi-flush fixing is not available for sounding devices. For dual-angle optics in this format, see S4-771-S.
Installation
Volume and tone are chosen at commissioning, not on the device. Level must not fall below 65 dBA at 1 m, and the system refuses zero.
Full details: S-Quad sensor sounder — installation data — 4188-1073 issue 3 · 28 pages · sounder level and tone tables, OH/S allocation
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