Gent S4 Dual Optical Heat Sensor Sounder
| Part no. | S4-771-S |
|---|---|
| Brand | Gent |
| Range | S4 Detectors |
| Sub-range | Detectors with Sounder |
Image for illustration; item supplied may differ
At a glance
- Dual optical and heat sensor sounderDual-angle optical chamber and thermistor. An integral sounder provides audible warning.
- 10 selectable sensing modesSTATE 0: normal optical sensitivity and Class A1 heat. The response is selected during commissioning.
- Monitored sounderChannel 5 reports sounder faults to the panel.
- Integral short circuit isolatorThe head includes loop short circuit isolation. S-Quad devices take their power from the loop at 35 V to 48 V.
- S-Quad mounting optionsFits the separate S4-700 base; the S4-FLUSH kit supports semi-flush mounting for white S-Quad heads.
- Three tone signalsThe S-Quad sounder function provides intermittent, alternating and continuous tone signals, with configurable soft start.
Description
The Gent S4-771-S is an addressable dual optical and heat sensor with an integral alarm sounder for Vigilon Plus, Compact Plus and Nano panels. Two optical readings help distinguish smoke from dust and steam, while the heat element measures temperature. Ten sensing modes are selectable at commissioning, with normal optical sensitivity and Class A1 heat as the default. The S-Quad sounder function gives an average 85 dB(A) at 1 m, with three tone signals and a soft start option. The head takes its power from the loop and includes a short circuit isolator. It fits the separately ordered S4-700 mounting base.
The S4-771-S combines dual-angle optical smoke sensing, thermistor heat sensing and an integral sounder. Sensing channels 1, 2 and 4 carry forward optical, heat and backward optical readings; channel 5 reports sounder faults. The panel compares the two optical readings to help distinguish smoke from dust and steam. This model gives tone alarms without speech or a visual alarm device.
Read the full technical description
The S4-771-S combines dual-angle optical smoke sensing, thermistor heat sensing and an integral sounder. Sensing channels 1, 2 and 4 carry forward optical, heat and backward optical readings; channel 5 reports sounder faults. The panel compares the two optical readings to help distinguish smoke from dust and steam. This model gives tone alarms without speech or a visual alarm device.
Ten sensing STATEs are selectable: 0, 2, 3, 4, 5, 6, 7, 8, 11 and 12. STATE 0 combines normal optical sensitivity with Class A1 heat. Other settings provide higher sensitivity, delayed optical response and heat classes B, BS and A2S. STATE 12 uses Class A1 heat alone. STATEs 2, 6, 11 and 12 do not meet EN 54-7. When testing with a smoke canister, panel Test mode treats the dual optical sensing as a single optical channel.
The S-Quad sounder function has an average output of 85 dB(A) at 1 m, or 75 dB(A) at 3 m at a bedhead. Its typical on-axis level at 90 degrees is 92 dB(A), and turbo mode adds 3 dB. Tone choices are intermittent 970 Hz at 1 Hz, alternating 730/970 Hz at 2 Hz, and continuous 970 Hz, with a frequency tolerance of +/-10%. Volume is set individually; maintain at least 65 dB(A) at 1 m. Soft start can ramp the volume to its selected level.
S-Quad devices take power from the loop at 35 V to 48 V. This head includes a short circuit isolator. Its Nano load factor is 6.5; Nano allows a maximum of 127 devices on its loop. This maximum is subject to loop loading. Use the Battery Standby and Loop Load calculator to determine the installed device mix, cable length and standby requirement.
The S4-771-S fits the separately ordered S4-700 base. Mount the base on a metal back box and maintain loop earth continuity. The S4-FLUSH kit provides semi-flush ceiling mounting for white S-Quad heads.
S-Quad sounders synchronise across all loops of one panel; synchronisation does not extend across a network of panels. The sounder circuit is monitored silently for failure. Use Vigilon commissioning tool version 1.32 or later for device-setting changes. Remove the supplied dust cover before commissioning.
Specifications
| Device type | Addressable dual optical and heat sensor sounder |
|---|---|
| Sensor marking | O2H/S |
| Sensing elements | Dual-angle optical chamber and thermistor |
| Analogue sensing channels | 1: forward optical; 2: heat; 4: backward optical |
| Selectable sensing STATEs | 0, 2, 3, 4, 5, 6, 7, 8, 11, 12 |
| Factory default | STATE 0: normal optical sensitivity and Class A1 heat |
| Compatible panels | Gent Vigilon Plus, Compact Plus and Nano |
| Power source | Loop powered |
| S-Quad loop operating voltage | 35 V to 48 V |
| Nano load factor per device | 6.5 |
| Nano panel loop limit | 127 devices maximum, subject to loop loading |
| Short circuit isolator | Integral |
| S-Quad isolator voltage data | Vmax 48 V; Vnom 40 V; Vmin 35 V; Vso max 16 V; Vso min 8 V |
| S-Quad isolator current and impedance | IC max 0.8 A; IS max 1.25 A; IL max 50 microamps; Zc max 0.13 ohm |
| S-Quad head dimensions | 117 mm diameter x 49.6 mm high |
|---|---|
| S-Quad height with standard base | 63.8 mm |
| S-Quad housing | ABS; white RAL 9010 |
| S-Quad operating temperature | -10°C to +50°C |
| S-Quad storage temperature | -20°C to +70°C |
| S-Quad relative humidity | 95% non-condensing at +5°C to +45°C |
| Mounting base | S4-700, ordered separately |
| S-Quad programmable connection | Monitored input or unmonitored output; default remote LED output |
| S-Quad external I/O cable limit | 15 m from base to external I/O unit |
| Sounder fault channel | Analogue channel 5 |
| S-Quad sounder output | Average 85 dB(A) at 1 m; 75 dB(A) at 3 m at a bedhead; typical on-axis 92 dB(A) at 90 degrees |
| S-Quad tone signals | Intermittent 970 Hz at 1 Hz; alternating 730/970 Hz at 2 Hz; continuous 970 Hz; frequencies +/-10% |
| S-Quad sounder adjustment | Turbo adds 3 dB; configurable soft start; minimum 65 dB(A) at 1 m |
Specifications per manufacturer documentation, subject to change. E&OE.
Standards and approvals
| Standard | What it covers |
|---|---|
| LPCB approved | Approved by the Loss Prevention Certification Board for fire detection and alarm system products. |
| EN 54-3:2001 + A1:2002 + A2:2006 | |
| EN 54-5:2000 + A1:2002 | |
| EN 54-7:2000 + A1:2002 + A2:2006 | |
| EN 54-17:2005 + AC:2007 | |
| EN 54-18:2005 + AC:2007 | |
| Declaration of Performance 075-CPR-2013 Issue 2 | |
| LPCB listing 042ca/02 |
Approval body: LPCB (notified body 2831).
Documents
| Document | Type | Size | Download |
|---|---|---|---|
| Datasheet (S4-770-S, S4-771-S) | Datasheet | 173 KB | Download PDF |
| Gent 4188-1073 issue 7 - S-Quad data and installation (white and black) | Installation | 7.2 MB | Download PDF |
FAQs
What sensing does the S4-771-S combine with its sounder?
The S4-771-S combines dual-angle optical smoke sensing, thermistor heat sensing and an integral tone sounder. Forward and backward optical readings reach the panel on channels 1 and 4, with heat on channel 2. Comparing the two optical readings helps distinguish smoke from dust and steam. Channel 5 reports sounder faults. The S4-771-S has no speech output or visual alarm device; the S4-711 provides dual optical and heat sensing without an integral sounder.
Can the S4-771-S sensing response be changed at commissioning?
Yes. The S4-771-S offers ten sensing STATEs: 0, 2, 3, 4, 5, 6, 7, 8, 11 and 12. STATE 0 starts with normal optical sensitivity and Class A1 heat. Other settings include high optical sensitivity, delayed optical response and heat classes B, BS and A2S. STATE 12 provides Class A1 heat-only detection. STATEs 2, 6, 11 and 12 do not meet EN 54-7. When testing with a smoke canister, panel Test mode treats the dual optical sensor as a single optical channel.
What do the S4-771-S sounder output figures mean?
The S-Quad sounder function has an average output of 85 dB(A) at 1 m, with 75 dB(A) at 3 m at a bedhead. The typical on-axis level at 90 degrees is 92 dB(A). Turbo mode increases output by 3 dB and increases power demand. Volume is individually adjustable, with a minimum of 65 dB(A) at 1 m for EN 54-3 compliance. A soft start can gradually increase the sound to its selected level. The S4-771-S provides tone alarms without speech.
Which base does the S4-771-S need?
The S4-771-S fits the standard S4-700 base, ordered separately from the sensor head. Mount the base on a metal back box, with earth continuity maintained around the loop. The S4-FLUSH kit provides semi-flush ceiling mounting for white S-Quad heads. S-Quad heads measure 117 mm in diameter and 49.6 mm high, or 63.8 mm high with a standard base. Remove the supplied dust cover before the fire alarm system is commissioned.
What Nano loop loading applies to the S4-771-S?
The S4-771-S has a Nano load factor of 6.5 per device, with a maximum of 127 devices on the loop subject to loop loading. Use the Battery Standby and Loop Load calculator for the device mix and required standby. S-Quad sounders synchronise across all loops of one panel; this does not extend across a network. The S4-771-S reports sounder faults on analogue channel 5. Its head takes power from the loop and includes a short circuit isolator.
Also in this range
- S4-770-SS4 Optical Heat Sensor Sounder£75.35ex VAT£90.42 inc VATIn stock
- S4-780-SS4 Heat Sensor Sounder£82.52ex VAT£99.02 inc VATIn stock
