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Part Number or the Week S3EP-V-VAD-HPR-R

Gent S4 Dual Optical Heat Sensor

Part no.S4-711
BrandGent
RangeS4 Detectors
Sub-rangeDetectors Only
Gent by Honeywell S4-711 S4 Dual Optical Heat Sensor — white circular ceiling sensor with central lens

Image for illustration; item supplied may differ

At a glance

  • Dual optical and heat sensorDual-angle optical chamber and thermistor. Sensing readings are sent to the control panel.
  • 10 selectable sensing modesSTATE 0: normal optical sensitivity and Class A1 heat. The response is selected during commissioning.
  • Addressable sensing channels1: forward optical; 2: heat; 4: backward optical.
  • 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.
  • Nano loop loadingNano load factor 0.5 per device. The Nano panel limit is 127 devices on its loop, subject to loop loading.

Documents

PDFGent 4188-1073 issue 7 - S-Quad data and installation (white and black) (PDF, 7.2 MB)
DescriptionSpecificationsStandards and approvalsDocumentsOptional accessoriesFAQsAlso in this range

Description

The Gent S4-711 is an addressable dual optical and heat sensor for Vigilon Plus, Compact Plus and Nano fire alarm panels. Its smoke chamber takes readings at two angles, which the panel compares to help distinguish smoke from dust and steam. A heat element adds temperature sensing in the same head. Ten sensing modes are selectable at commissioning, starting with normal optical sensitivity and Class A1 heat. The sensor draws its power from the loop and includes a short circuit isolator. It fits the separate S4-700 base, with a white ABS housing and red fire LED. The S4-771-S adds an integral sounder.

The S4-711 uses a dual-angle smoke chamber and a thermistor. The optical sensing channels measure forward and backward scatter, on channels 1 and 4, while channel 2 measures heat. The panel compares the two optical readings as a ratio to help separate smoke from dust and steam. The optical system also has an extended dynamic range.

Read the full technical description

The S4-711 uses a dual-angle smoke chamber and a thermistor. The optical sensing channels measure forward and backward scatter, on channels 1 and 4, while channel 2 measures heat. The panel compares the two optical readings as a ratio to help separate smoke from dust and steam. The optical system also has an extended dynamic range.

The sensing STATE is a commissioning choice. The ten options are 0, 2, 3, 4, 5, 6, 7, 8, 11 and 12. STATE 0 combines normal optical sensitivity with Class A1 heat. STATE 3 increases optical sensitivity, STATE 8 delays the optical response, and STATE 12 gives heat-only Class A1 detection. Heat classes B, BS and A2S are available in other modes. STATEs 2, 6 and 11 use low optical sensitivity.

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 0.5; 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.

S-Quad heads plug into the separately ordered S4-700 base. Mount the base on a metal back box, maintain loop earth continuity and connect earth securely to the box. The base locking peg can secure the head against removal. A locked head needs access to the peg for release. The S4-FLUSH kit provides semi-flush ceiling mounting for the white S-Quad range.

The S-Quad programmable connection supports either a monitored input or an unmonitored output. The default output drives a remote repeat LED without a series resistor. One 13449-01 or SEN-LED remote indicator can connect to a base, with a maximum run of 15 m to the external I/O unit. The head is supplied with a dust cover, which must be removed before commissioning.

Specifications

Device typeAddressable dual optical and heat sensor
Sensor markingO2H
Sensing elementsDual-angle optical chamber and thermistor
Analogue sensing channels1: forward optical; 2: heat; 4: backward optical
Selectable sensing STATEs0, 2, 3, 4, 5, 6, 7, 8, 11, 12
Factory defaultSTATE 0: normal optical sensitivity and Class A1 heat
Compatible panelsGent Vigilon Plus, Compact Plus and Nano
Power sourceLoop powered
S-Quad loop operating voltage35 V to 48 V
Nano load factor per device0.5
Nano panel loop limit127 devices maximum, subject to loop loading
Short circuit isolatorIntegral
S-Quad isolator voltage dataVmax 48 V; Vnom 40 V; Vmin 35 V; Vso max 16 V; Vso min 8 V
S-Quad isolator current and impedanceIC max 0.8 A; IS max 1.25 A; IL max 50 microamps; Zc max 0.13 ohm
S-Quad head dimensions117 mm diameter x 49.6 mm high
S-Quad height with standard base63.8 mm
S-Quad housingABS; white RAL 9010
S-Quad operating temperature-10°C to +50°C
S-Quad storage temperature-20°C to +70°C
S-Quad relative humidity95% non-condensing at +5°C to +45°C
Mounting baseS4-700, ordered separately
S-Quad programmable connectionMonitored input or unmonitored output; default remote LED output
S-Quad external I/O cable limit15 m from base to external I/O unit

Specifications per manufacturer documentation, subject to change. E&OE.

Standards and approvals

StandardWhat it covers
LPCB approvedApproved by the Loss Prevention Certification Board for fire detection and alarm system products.
EN 54-5
EN 54-7
EN 54-17
EN 54-18
Declaration of Performance 001-CPR-2013
LPCB listing 042bf/02

Approval body: LPCB (notified body 2831).

Documents

DocumentTypeSizeDownload
Gent 4188-1073 issue 7 - S-Quad data and installation (white and black)Installation7.2 MBDownload PDF

Optional accessories

FAQs

What does dual optical sensing add to the S4-711?

The S4-711 takes forward-scatter and backward-scatter readings from its optical chamber. The panel compares those two readings as a ratio, helping it distinguish smoke from dust and steam. That is the optical arrangement used across the S-Quad dual optical range. A thermistor supplies a separate heat reading, so the head combines optical smoke and heat sensing. The S4-710 has a single forward optical channel with heat, while the S4-771-S combines the dual optical and heat arrangement with a sounder.

Does the S4-711 have more than three sensing modes?

Yes. The S4-711 has ten selectable sensing STATEs: 0, 2, 3, 4, 5, 6, 7, 8, 11 and 12. Its factory setting is STATE 0, combining normal optical sensitivity and Class A1 heat. STATE 3 raises optical sensitivity, STATE 8 delays the optical response, and STATE 12 gives Class A1 heat-only detection. Other modes include heat classes B, BS and A2S. STATEs 2, 6 and 11 use low optical sensitivity, selected during commissioning to suit the installed environment.

How is the S4-711 tested with a smoke aerosol?

Use the panel Test mode for aerosol testing of the S4-711. In that mode, S-Quad dual optical sensors are treated as single-channel optical sensors. This matters because aerosol test particles resemble steam, while normal dual optical processing is designed to reduce unwanted alarms from dust and steam. The S4-711 retains its forward optical, heat and backward optical sensing channels as part of its hardware. Its ordinary detection response is determined by the sensing STATE selected during commissioning.

Does the S4-711 include an alarm sounder?

The S4-711 provides dual optical and heat sensing without an integral sounder, speech output or visual alarm device. The S4-771-S combines dual optical and heat detection with a tone sounder, while the S4-711-V is the voice-sounder version. On the S4-711, sensing channels 1 and 4 carry the two optical readings and channel 2 carries heat. It has a red LED for fire indication and fits the separate S4-700 base. The head also includes a short circuit isolator.

Can the S4-711 use a remote fire indicator?

Yes. The S-Quad programmable connection is set at the factory as an unmonitored output for a remote repeat LED, without a series resistor. One 13449-01 or SEN-LED indicator can be wired to the base, and the cable linking the base and external I/O unit is limited to 15 m. The same connection can instead be configured as a monitored input. The S4-711 itself retains its red fire LED and reports its optical and heat sensing readings to the control panel.

Also in this range