The S4T-710 is the optical-and-heat head of the Gent S-Quad Self-Test range. It occupies two analogue channels at the panel — channel 1 for forward-scatter optical smoke and channel 2 for heat — and its product plate declares EN 54-5, 7, 17 and 18. Nothing on this part sounds or flashes, so the baffle ring is black and the alarm-fault channel is unused.
One scatter angle means the panel receives a single optical value from the chamber, with no forward-to-backward pair to compare. In clean-air areas that is normally what is specified, and it keeps the device to two analogue values on the loop.
Where dust or steam is a known nuisance source, the dual-angle S4T-711 adds the backward-scatter channel this head does not carry. For the same sensing block with a tone sounder built in, see S4T-770-S.
Technical data
| Sensing elements | Forward-scatter optical smoke sensor and heat sensor |
| Label marking | OH |
| Analogue channels | 1 optical (forward), 2 heat |
| EN 54 parts declared | EN 54-5, 7, 17, 18 |
| Sensing approvals | EN 54-5:2017 + A1:2018 (heat); EN 54-7:2018 (optical) |
| Alarm outputs | None |
| Baffle ring | Black |
Specifications from Gent 4188-1130 issue 1 (12/23).
Compatibility
Mounts on the S4-700 base, Gent's base for all Self-Test sensors, with the S4-705 IP21C plate and the S4-FLUSH semi-flush kit as associated parts. Self-Test needs the Vigilon loop of a Vigilon plus or Compact plus panel on compatible firmware.
Installation
Check the baffle ring: black is correct here, because on this range black denotes sensor and/or VAD and white denotes speech or sounder. The base takes a programmable input/output, factory-set as an unmonitored output that drives an external repeat LED with no series resistor, over no more than 15 metres.
Full details: S-Quad Self-Test (S4T) Data and Installation — 4188-1130 · 28 pages · full technical data table, loop wiring, the analogue channel map and the self-test sequence
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