Gent S4 SELF TEST Optical Heat Sensor + Sounder
| Part no. | S4T-770-S |
|---|---|
| Brand | Gent |
| Range | S4 Self Test Detectors |
| Sub-range | Detectors with Sounder |
Image for illustration; item supplied may differ
At a glance
- Optical and heat multi-sensorSingle-angle optical smoke sensing and a separate heat thermistor supply readings to the panel.
- Functional sensor self-testGenerated aerosol tests the optical response and 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-770-S combines optical and heat detection with a tone sounder and sensor self-test. It reads smoke at one optical angle and measures heat with a thermistor. The sounder provides intermittent, alternating or continuous tones, with volume set at each device. Self-test uses aerosol to test the smoke chamber and warms the heat element to check its response. A fan then clears the aerosol through the smoke entry points. 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. Testing uses the CLSS app, a gateway and a Self-Test licence.
The S4T-770-S pairs optical and heat detection with a tone sounder. Its smoke sensor uses one transmitting LED and an infrared receiver to measure forward-scattered light in the optical chamber. A separate thermistor measures heat. The panel uses these readings and the configured detection state to decide when to raise a fire alarm.
Read the full technical description
The S4T-770-S pairs optical and heat detection with a tone sounder. Its smoke sensor uses one transmitting LED and an infrared receiver to measure forward-scattered light in the optical chamber. A separate thermistor measures heat. The panel uses these readings and the configured detection state to decide when to raise a fire alarm.
Optical self-test generates a controlled amount of paraffin aerosol and uses a fan to move it into the sensing chamber. The panel checks the optical response. The fan then increases airflow to clear the aerosol through the smoke entry points, and the panel checks the fall in readings back to ambient levels. Heat self-test warms the thermistor and checks its response over time.
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 | 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
How does the S4T-770-S differ from the S4T-771-S?
The S4T-770-S has a single-angle optical smoke sensor, a heat thermistor and a tone sounder. The S4T-771-S uses dual optical angles with heat sensing and a tone sounder. The second optical angle lets the panel compare readings to help distinguish certain smoke aerosols from dust or steam. Both models belong to the Self-Test range, but the S4T-770-S tests one optical channel alongside its heat element. Neither of these two tone sounder models has voice messages or a VAD.
How does sensor self-test work on the S4T-770-S?
The S4T-770-S generates aerosol and moves it into the single-angle optical chamber. The panel checks the smoke response before the fan clears the aerosol through the smoke entry points. The panel then checks that optical readings fall back to ambient levels. Heat self-test warms the thermistor and verifies its response over time. The integrated sounder circuit is monitored for faults. Functional sensor testing is initiated through the CLSS app with a gateway connection and an active Self-Test licence.
Which alarm tones can the S4T-770-S produce?
The S4T-770-S provides the S4T sounder tone set: an intermittent nominal 933 Hz tone pulsed at 1 Hz, an alternating 933 and 700 Hz tone, and a continuous nominal 933 Hz tone. The alternating tone spends 0.25 seconds at each frequency. Tone selection and volume are configured for the installation. This is a tone sounder detector with single-angle optical and heat sensing; it does not store voice announcements. The sounder circuit is monitored silently for faults during normal operation.
Can the S4T-770-S sounder volume be adjusted?
Yes. The S4T-770-S uses the S4T sounder function with volume adjustable at each device. The average output is 85 dBA at 1 m, with Turbo mode adding 3 dB when configured. The setting must remain at least 65 dBA at 1 m; the system prevents adjustment to zero. Soft start can raise the volume progressively to the chosen level. Sounder outputs synchronise within their sector across loops of the same panel, without synchronising across a network of panels.
What system and mounting does the S4T-770-S need?
The S4T-770-S takes loop power and fits an S4-700 base mounted on a metal back box. Its Self-Test range supports Vigilon Plus and Compact Plus with compatible firmware and a VIGPLUS-LPC-EN loop card. Testing uses CLSS with a gateway, app and active licence. The supplied dust cover protects the optical chamber during building work and is removed before commissioning. Calculate the loop load and standby requirement with the sounder mode included: the S4T sounder current increases in Turbo mode.
Also in this range
- S4T-771-SS4 SELF TEST Dual Optical Heat Sensor + Sounder£115.42ex VAT£138.50 inc VATIn stock
- S4T-780-SS4 SELF TEST Heat Sensor + Sounder£104.66ex VAT£125.59 inc VATIn stock
