Gent S4 Optical Heat Sensor Sounder
| Part no. | S4-770-S |
|---|---|
| Brand | Gent |
| Range | S4 Detectors |
| Sub-range | Detectors with Sounder |
Image for illustration; item supplied may differ
At a glance
- Optical and heat sensor sounderSingle forward-scatter 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 S4-770-S is an addressable optical and heat sensor with an integral sounder for Vigilon Plus, Compact Plus and Nano panels. A single optical smoke channel and a heat element provide fire sensing, with ten modes selected at commissioning. 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 is loop powered and includes a short circuit isolator. It fits the separate S4-700 mounting base. Analogue channel 5 reports sounder faults to the control panel. The factory sensing mode combines normal optical sensitivity and Class A1 heat.
The S4-770-S combines a single forward-scatter smoke chamber, a thermistor and an integral sounder. Analogue channels 1 and 2 carry smoke and heat readings; channel 5 reports sounder faults. The marking is OH/S. It provides alarm tones without speech or a visual alarm device. For dual-angle optical sensing with heat and a sounder, the corresponding model is S4-771-S.
Read the full technical description
The S4-770-S combines a single forward-scatter smoke chamber, a thermistor and an integral sounder. Analogue channels 1 and 2 carry smoke and heat readings; channel 5 reports sounder faults. The marking is OH/S. It provides alarm tones without speech or a visual alarm device. For dual-angle optical sensing with heat and a sounder, the corresponding model is S4-771-S.
The ten sensing STATEs are 0, 2, 3, 4, 5, 6, 7, 8, 11 and 12. STATE 0 combines normal optical sensitivity with Class A1 heat. Other choices include higher optical sensitivity, delayed optical response, and heat classes B, BS and A2S. STATE 12 gives Class A1 heat-only sensing. STATEs 2, 6, 11 and 12 do not meet EN 54-7.
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 S4-770-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 optical and heat sensor sounder |
|---|---|
| Sensor marking | OH/S |
| Sensing elements | Single forward-scatter optical chamber and thermistor |
| Analogue sensing channels | 1: forward optical; 2: heat |
| 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 074-CPR-2013 Issue 2 | |
| LPCB listing 042ca/03 |
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
How does the S4-770-S differ from the S4-771-S?
The S4-770-S combines a single forward-scatter optical smoke channel, a heat element and an integral sounder. The S4-771-S uses a dual-angle optical chamber with heat and a sounder, adding a backward-scatter reading for the panel to compare with the forward reading. Both have ten selectable sensing STATEs and provide tone alarms without speech or a visual alarm device. Each is loop powered, includes a short circuit isolator and fits a separately ordered S4-700 standard base.
Which sensing modes are available on the S4-770-S?
The S4-770-S has ten selectable sensing STATEs: 0, 2, 3, 4, 5, 6, 7, 8, 11 and 12. Factory default STATE 0 combines normal optical sensitivity with Class A1 heat. Other modes provide higher or delayed optical sensitivity 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. The sensing STATE and the sounder settings are separate commissioning choices on the same device.
What sound level and tones does the S4-770-S provide?
Its integral sounder uses the S-Quad sounder function: average output is 85 dB(A) at 1 m, or 75 dB(A) at 3 m at a bedhead. Typical on-axis output at 90 degrees is 92 dB(A). Turbo mode adds 3 dB. The three signals are intermittent 970 Hz at 1 Hz, alternating 730/970 Hz at 2 Hz, and continuous 970 Hz, with frequencies subject to +/-10% tolerance. Volume is individually adjustable and must remain at least 65 dB(A) at 1 m.
Which base does the S4-770-S need?
The S4-770-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.
How does the S4-770-S sounder synchronise and report faults?
S-Quad sounders synchronise across all loops of one panel. That synchronisation does not extend across a network of panels. On the S4-770-S, analogue channel 5 reports sounder faults, while sensing channels 1 and 2 carry optical and heat readings. The sounder circuit is monitored silently for failure. Sound level is set individually during commissioning, with a configurable soft start that ramps up to the selected volume. Use Vigilon commissioning tool version 1.32 or later for device-setting changes.
Also in this range
- S4-771-SS4 Dual Optical Heat Sensor Sounder£91.50ex VAT£109.80 inc VATIn stock
- S4-780-SS4 Heat Sensor Sounder£82.52ex VAT£99.02 inc VATIn stock
