Gent S4 SELF TEST Heat Sensor + Sounder
| Part no. | S4T-780-S |
|---|---|
| Brand | Gent |
| Range | S4 Self Test Detectors |
| Sub-range | Detectors with Sounder |
Image for illustration; item supplied may differ
At a glance
- Heat detectorA thermistor provides heat sensing, with A1, A2, A2S, B and BS states selectable at the panel.
- Functional sensor self-testThe heat element is warmed and readings are sent to the panel to verify its response over time.
- 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-780-S combines heat detection with a tone sounder and heat self-test. A thermistor measures temperature and is warmed during testing to check its response over time. The panel applies the selected heat class, with A1 as the default and A2, A2S, B and BS also available. Its sounder provides intermittent, alternating or continuous tones, with volume set at each device. This white head takes power from the loop and fits an S4-700 base. It belongs to the S-Quad Self-Test range for Vigilon Plus and Compact Plus. Testing is run through the CLSS app with a gateway and an active Self-Test licence.
The S4T-780-S combines heat detection with a tone sounder. A thermistor provides heat sensing, with the alarm response determined by the state selected at the panel. State 0 selects A1 heat detection and is the factory default. The other choices are state 5 for B, state 6 for BS, state 7 for A2S and state 13 for A2. The BS setting has no rate-of-rise component.
Read the full technical description
The S4T-780-S combines heat detection with a tone sounder. A thermistor provides heat sensing, with the alarm response determined by the state selected at the panel. State 0 selects A1 heat detection and is the factory default. The other choices are state 5 for B, state 6 for BS, state 7 for A2S and state 13 for A2. The BS setting has no rate-of-rise component.
Heat self-test warms the thermistor. During the heating period, the detector sends analogue readings to the control panel, which checks the change in response over time. This model has heat sensing only. It does not detect smoke or carry out an optical self-test.
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 | Heat detector |
|---|---|
| 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 A1), 5 (B), 6 (BS), 7 (A2S), 13 (A2) |
| 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
Does the S4T-780-S combine smoke and heat sensing?
No. The S4T-780-S combines a heat sensing thermistor with a tone sounder. It has no optical smoke sensing element. The panel applies the selected heat state to the thermistor readings, with A1 as the default and A2, A2S, B and BS also available. Its self-test warms the thermistor and checks its response over time. The S4T-770-S is the separate single-angle optical and heat model with a tone sounder. Neither of these models includes spoken messages or a VAD.
How does the S4T-780-S test its heat detector?
The S4T-780-S heats its thermistor during self-test and returns analogue readings to the panel. The panel checks how the reading changes over the heating period to verify the thermal response. This is the sensing element used by the heat detector. The sounder circuit is monitored separately for faults during normal operation. Testing is initiated through the CLSS app with a gateway connection and an active Self-Test licence. The panel must be in Service mode for the sensor test.
Which heat settings does the S4T-780-S provide?
The S4T-780-S offers five heat states. State 0 selects A1 and is the factory default; state 13 selects A2, state 7 selects A2S, state 5 selects B and state 6 selects BS. The BS response has no rate-of-rise component. Choose the state as part of the detection design for the location. Avoid placing this heat detector above boilers or heaters, or where temperatures are normally very high or subject to sudden fluctuations. Its tone sounder provides the local audible output.
How can the S4T-780-S tone sounder be configured?
The S4T-780-S provides intermittent, alternating and continuous tones through the S4T sounder function. Its average output is 85 dBA at 1 m, with a configurable Turbo mode adding 3 dB. Volume can be adjusted at each device but must remain at least 65 dBA at 1 m. Soft start can raise the volume progressively to the set level. Outputs synchronise within their sector across loops of one panel, and the sounder circuit is monitored silently for faults in normal operation.
What base and system support the S4T-780-S?
The S4T-780-S plugs into an S4-700 base fixed to a metal back box. Its Self-Test range supports Vigilon Plus and Compact Plus with compatible firmware, SD-card controller hardware and a VIGPLUS-LPC-EN loop card. Sensor testing needs the CLSS app, an active licence and a gateway for the network domain. The head takes power from the loop and includes a short-circuit isolator. Calculate loop loading and standby capacity with the sounder mode included, as Turbo operation increases the audible function current.
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