Gent S4 SELF TEST Dual Optical Heat Sensor + Voice Sounder & High Power Red VAD

The S4T-711-V-VAD-HPR pairs dual optical and heat detection with a voice sounder and a High Power red VAD. Two transmitting LEDs and an infrared receiver measure smoke at two angles within one optical chamber. The panel compares the readings as a ratio, helping it distinguish certain smoke aerosols from dust or steam. The extended optical measuring range allows use where dust or steam occurs occasionally. A separate thermistor provides heat sensing.

Optical self-test generates paraffin aerosol and moves it into the chamber with a variable-speed fan. Readings from both optical channels are checked. The fan then increases airflow to clear the aerosol through the smoke entry points, with the panel checking the decline in readings and their return to ambient levels. Heat self-test warms the thermistor and checks its thermal response.

The voice sounder stores four default English messages and a bell tone. The messages cover emergency evacuation, waiting for further instructions, a system test and fire evacuation. An attention tone precedes the spoken message. The S4T speech function holds up to 20 seconds of audio; its normal 10-second signal period can be extended to 30 seconds. The stored messages can be reprogrammed. The High Power red VAD is ceiling mounted. Its category C coverage is C-3-14 at High Power, C-3-13 at Medium Power and C-3-10 at Low Power, corresponding to 461.8, 398.1 and 235.6 cubic metres. These coverage settings require compliant operation and a two-second flash period; High and Medium Power require an Enhanced Loop Card. Position the combined detector and VAD to meet both detection and visual-warning needs. Across the S4T range, outputs in the same sector synchronise across the loops of one panel. Synchronisation does not extend across a network of panels.

The head fits an S4-700 base with an S4-705 IP21C plate, mounted on a metal back box. Use screened two-core fire-rated loop cable with conductors from 1.5 to 2.5 mm² and maintain earth continuity. Supplied with one detector head and one orange dust cover. The cover protects the detector during building work and must be removed before commissioning. The S4T range has IP21C housings measuring 117 mm in diameter and 63 mm high, increasing to 70 mm with the standard base.

The S-Quad Self-Test range operates on Vigilon Plus and Compact Plus systems with compatible firmware, SD-card MCC or MCB hardware and a VIGPLUS-LPC-EN loop card. Self-test requires a CLSS gateway for each network domain, the CLSS mobile app and an active Self-Test licence. Run testing with the panel in Service mode. Configure the system with Vigilon Commissioning Tool V1.40 or later, and calculate the loop load and standby requirement with the Battery Standby and Loop Load Calculator.