The S4T-720-V-VAD-HPR combines heat-only detection with both alarm outputs the Self-Test range offers — a voice sounder and a high-power red VAD. It uses just two analogue channels, 2 for heat and 5 for alarm-device faults, and its plate declares EN 54-3, 5, 17, 18 and 23.
It is the specification for a kitchen, plant room or workshop that still sits on an evacuation route: full audible and visual alarm coverage from one device, with a sensing element that will not react to cooking or exhaust aerosols. Detection performance is heat performance, so spacing follows heat rules even though the alarm coverage is that of a full-output VAD.
Gent prints this part's label marking as H/VS/RVAD/HP, with a slash between RVAD and HP where the rest of the VAD line-up prints RVAD-HP; that is reproduced here as printed. For dual-angle optical sensing on the same output set, the part is S4T-711-V-VAD-HPR.
Technical data
| Sensing elements | Heat sensor only |
| Label marking | H/VS/RVAD/HP (as printed) |
| Analogue channels | 2 heat, 5 alarm faults |
| EN 54 parts declared | EN 54-3, 5, 17, 18, 23 |
| VAD, High setting | 16 mA (560 mW); coverage C-3-14, 461.8 m³ |
| VAD, Medium setting | 11.5 mA (403 mW); coverage C-3-13, 398.1 m³ |
| VAD, Low setting | 6 mA (210 mW); coverage C-3-10, 235.6 m³ |
| Total loop current, VAD + sounder | High 20.5 mA Turbo / 18 mA non-Turbo; Medium 16 mA / 13.5 mA; Low 10.5 mA / 8 mA |
| Baseline at manufacture (Tnew) | Channel 2 heat 66 |
| Baffle ring | White |
Specifications from Gent 4188-1130 issue 1 (12/23).
Compatibility
Fits the S4-700 base with the S4-705 IP21C plate. Self-Test needs the Vigilon loop of a Vigilon plus or Compact plus panel on compatible firmware
Installation
This part draws both currents at once, so use the combined VAD-and-sounder figures for the loop calculation, not the VAD-only column — the difference between Low non-Turbo and High Turbo is 8 mA against 20.5 mA per device. Leave the flash at the two-second rate for EN 54-23 compliance.
Full details: S-Quad Self-Test (S4T) Data and Installation — 4188-1130 · 28 pages · technical data, combined VAD and sounder loop currents, coverage tables and speech behaviour
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