Gent S4 SELF TEST Dual Optical Heat Sensor + Sounder
| Part no. | S4T-771-S |
|---|---|
| Brand | Gent |
| Range | S4 Self Test Detectors |
| Sub-range | Detectors with Sounder |
Image for illustration; item supplied may differ
At a glance
- Dual optical and heat multi-sensorTwo optical angles help distinguish certain smoke aerosols from dust or steam, alongside heat sensing.
- Functional sensor self-testGenerated aerosol tests both optical channels and the smoke entry path; warming the thermistor tests heat response.
- Tone sounderIntermittent, alternating and continuous tones, with individually adjustable volume.
- Loop power and isolationThe S4T range operates from a 35 to 48 V loop supply and includes short-circuit isolation.
- S4-700 base fitThe S4T head plugs into an S4-700 base mounted on a metal back box; one orange dust cover is supplied.
- CLSS testingThe S4T range uses the CLSS app, a gateway and an active Self-Test licence on supported Vigilon Plus and Compact Plus systems.
Description
The Gent S4T-771-S combines dual optical and heat detection with a tone sounder and sensor self-test. It reads smoke at two angles and measures heat with a thermistor. The panel compares the optical readings to help distinguish smoke from some dust and steam. Self-test uses aerosol to test both optical channels and warms the heat element to check its response. This white head fits an S4-700 base and takes power from the loop. It belongs to the S-Quad Self-Test range for Vigilon Plus and Compact Plus. Sounder volume can be set at each device. Testing uses the CLSS app, a gateway and a Self-Test licence.
The S4T-771-S pairs dual optical and heat detection with a tone sounder. 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.
Read the full technical description
The S4T-771-S pairs dual optical and heat detection with a tone sounder. 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 S4T sounder function provides intermittent, alternating and continuous tones. Its average output is 85 dBA at 1 m, with a configurable Turbo mode adding 3 dB. Volume is adjustable at each device and must remain at least 65 dBA at 1 m. Soft start raises the sound progressively to the selected level. The sounder circuit is monitored silently for faults. 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 the S4-700 base, which requires 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.
Specifications
| Sensor technology | Dual optical and heat multi-sensor |
|---|---|
| Alarm output | Tone sounder |
| Power source | Loop powered |
| Operating voltage (S4T range) | 35 to 48 V |
| Short-circuit isolator | Integral |
| Isolator data (S4T range) | Vmax 48 V; Vnom 40 V; Vmin 35 V; Vso max 16 V; Vso min 8 V; IC max 0.8 A; IS max 1.25 A; IL max 50 µA; Zc max 0.13 ohm |
| Base compatibility | S4-700 |
| Base mounting (S4T range) | Metal back box required |
| Loop cable (S4T range) | Screened two-core fire-rated cable; 1.5 to 2.5 mm² conductors |
| Head dimensions (S4T range) | 117 mm diameter x 63 mm height |
| Height with standard base (S4T range) | 70 mm |
| Body colour | White, RAL 9010 |
| Outer housing (S4T range) | Terluran GP-35 ABS |
| Ingress protection (S4T range) | IP21C |
|---|---|
| Ambient temperature (S4T range) | -10 to +50°C |
| Storage temperature (S4T range) | -20 to +65°C |
| Relative humidity (S4T range) | 95% non-condensing at +5 to +45°C |
| Detection airflow (S4T range) | 0 to 20 m/s |
| Self-test controls (S4T range) | CLSS app, gateway and active Self-Test licence |
| Detection states | 0 (default), 2, 3, 4, 5, 6, 7, 8, 11, 12 |
| Sounder current (S4T range) | 2 mA average; 4.5 mA maximum in Turbo mode |
| Average sounder output (S4T range) | 85 dBA at 1 m; Turbo mode adds 3 dB |
| Sounder tones (S4T range) | Nominal: intermittent 933 Hz at 1 Hz; alternating 933/700 Hz, 0.25 seconds each; continuous 933 Hz |
| Dust cover (S4T range) | One orange dust cover supplied; remove before commissioning |
| Tamper resistance (S4T range) | Tool needed for removal when the base lock is engaged |
Specifications per manufacturer documentation, subject to change. E&OE.
Documents
| Document | Type | Size | Download |
|---|---|---|---|
| Datasheet (805576, S4BK-700, S4T-710, S4T-711, S4T-711-V +8 more) | Datasheet | 546 KB | Download PDF |
| Gent 4188-1130 issue 2 - S-Quad Self-Test (S4T) data and installation | Installation | 6.8 MB | Download PDF |
Optional accessories
- S4-705IP21 base covers (pack 5)Optional IP21C base cover plate£11.37ex VAT£13.64 inc VATIn stock
- S4-FLUSHS-Quad Semi-Flush Mounting KitSemi-flush mounting kit for S-Quad Self-Test device£28.23ex VAT£33.88 inc VATIn stock
- 13449-01Remote LED (for use with common base S4-700)External repeat LED driven by device I/O£13.46ex VAT£16.15 inc VATIn stock
FAQs
What sensing arrangement does the S4T-771-S use?
The S4T-771-S combines dual optical smoke sensing, a heat thermistor and a tone sounder. Its chamber measures light at two angles, with the panel comparing the optical readings as a ratio. That comparison helps distinguish certain smoke aerosols from dust or steam. The S4T-770-S is the single-angle optical and heat model with a tone sounder. Self-test on the S4T-771-S verifies both optical channels as well as the heat response. This model has no voice messages or integral VAD.
What does sensor self-test check on the S4T-771-S?
The S4T-771-S moves generated aerosol into its dual optical chamber and checks both optical readings. The fan then clears the aerosol through the smoke entry points, with the panel checking the decrease in readings and their return to ambient levels. Heat self-test warms the separate thermistor and verifies its thermal response over time. The tone sounder circuit is monitored for faults. Self-test is initiated from the CLSS app and needs the gateway connection and an active Self-Test licence.
What sound output is available from the S4T-771-S?
The S4T-771-S uses the S4T sounder function with intermittent, alternating and continuous tones. Its average output is 85 dBA at 1 m, and Turbo mode adds 3 dB when configured. Volume is individually adjustable but must stay at least 65 dBA at 1 m. Soft start raises the sound progressively to its selected level. The sounder outputs synchronise within their sector across loops of one panel. This tone sounder model combines audible warning with dual optical and heat sensing.
How is the S4T-771-S sounder load accounted for?
The S4T sounder function draws 2 mA on average and up to 4.5 mA in Turbo mode. For the S4T-771-S, include that audible function and its selected mode when calculating the installation. The Battery Standby and Loop Load Calculator must be used to determine loop loading, cable loading and standby capacity. The detector receives its power from the loop at the S4T range voltage of 35 to 48 V. It also incorporates a short-circuit isolator in the head.
What does an S4T-771-S Self-Test installation need?
The S4T-771-S fits an S4-700 base mounted on a metal back box, using screened two-core fire-rated loop cable. Self-Test operation needs a supported Vigilon Plus or Compact Plus system with compatible firmware and a VIGPLUS-LPC-EN card. An active Self-Test licence, the CLSS app and a gateway are needed to run sensor tests. The white head includes a dust cover for building work; remove it before commissioning so that the smoke entry points are clear for detection and testing.
Also in this range
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