Description
Honeywell Gent S4-711 S-Quad Optical Heat Multi-Sensor | BS 5839-1:2025
The S4-711 is a high-performance multi-sensor fire detector designed to minimise false alarms while maintaining exceptional fire detection accuracy. Combining optical smoke and heat sensing, it provides a reliable solution for challenging environments such as hotels, offices, and commercial buildings where standard detectors may struggle.
Engineered as part of the Gent S-Quad range, the S4-711 delivers advanced detection with intelligent processing—ensuring rapid response to real fire conditions while reducing nuisance activations.
S4-711 at a Glance
- Product Code: S4-711
- Detection Type: Optical Smoke + Heat (Multi-Sensor)
- System Compatibility: Gent Vigilon & Compact Plus
- Key Feature: Dual-angle optical technology with built-in short circuit isolator
- Best For: High-occupancy and false alarm-prone environments
S4-711 Technical Specifications
To support system planning and replacement verification, here are the core specifications of the S4-711:
| Specification | Details |
|---|---|
| Type | Multi-sensor (Optical + Heat) |
| Voltage | 35-41V DC (24V nominal) |
| Current (Standby / Alarm) | 0.6 mA / 3.5 mA |
| Loop Loading (Standby / Alarm) | 0.6 mA / 3.5 mA |
| Loading Factor | 1 |
| Max Devices per Loop | Up to 200 (system dependent) |
| Temperature Range | -10°C to +50°C |
| Humidity | 0–95% RH (non-condensing) |
| IP Rating | IP30 |
| Dimensions / Weight | 117mm x 49.6mm W/O base / 110g |
| Material | White polycarbonate |
| Addressing | Soft addressing |
| Isolator | Integrated |
| Indicator | Red LED |
| Base Compatibility | S4-700 series |
| Standards | EN54-5, EN54-7, EN54-17 |
| Approvals | LPCB, CPR |
How the S4-711 Works
The S4-711 uses advanced dual-angle optical technology combined with heat sensing to accurately detect fire conditions while reducing false alarms.
Inside the detector, two optical transmitters and a receiver monitor how light is scattered by airborne particles. The control panel analyses these readings as a ratio, allowing it to distinguish between real fire smoke and contaminants such as dust or steam.
A built-in heat sensor (thermistor) continuously monitors temperature and rate-of-rise conditions, providing an additional layer of detection.
This multi-criteria approach ensures:
- Reliable detection of both smouldering and flaming fires
- Reduced false alarms in challenging environments
- Stable performance across varying site conditions
Key Technology & Benefits
- Dual-angle optical technology for superior false alarm immunity
- Multi-sensor detection (optical + heat) for improved fire response
- Advanced algorithms to distinguish real fire events
- Built-in short circuit isolator for enhanced system resilience
- Programmable sensitivity for different environments
- Time-of-day configuration for adaptive performance
- Reduced installation costs via S-Quad multi-function capability
- Certified to EN54 standards
Utilising both forward and backward light scatter, the S4-711 can distinguish between the large particles found in steam or dust and the small particles produced by real combustion. This effectively eliminates nuisance alarms in areas like hotel rooms or near communal kitchens.
Gent S4-711 System Design & Loop Loading
- Max Devices: Up to 200 per loop (subject to current)
- Loop Capacity: 500 mA (300 mA if >1 km)
- Current (Standby / Alarm): 0.6 mA / 3.5 mA per device
Example:
100 devices = 60 mA (standby) / 350 mA (alarm) → within loop capacity
Design Notes:
Include all devices • Use worst-case load • 1.5 mm² cable • Unique addressing • Built-in isolators protect loop
Typical Applications
The Gent S4-711 is ideal for environments where reliability and false alarm reduction are critical:
- Hotels and accommodation
- Student housing
- Healthcare facilities
- Office buildings
- Educational institutions
- Public buildings and high-traffic areas
- Kitchens, corridors, and plant rooms
It is particularly effective in locations where steam, dust, or aerosols may otherwise trigger unwanted alarms.
Installation & Maintenance
Installation
- Fit to S4-700 base, connect loop wiring (correct polarity)
- Soft address via panel/programmer, then twist-lock detector
- Integrated isolator removes need for additional wiring
Maintenance
- Regular visual checks (more frequent in dusty areas)
- Clean with vacuum or damp cloth
- Functional test annually (approved test equipment)
- Replace after 10 years
Testing: Every 6 months in line with BS 5839-1
Upgrading from Gent 34000 Series
The Gent S4-711 is part of the advanced S-Quad range, which uses a different communication protocol and base compared to older Gent 34000 series detectors.
As a result, direct replacement is not possible—you cannot simply swap detector heads. The S4-711 requires the S-Quad (S4-700 series) base, and existing wiring may need to be adapted.
It’s also important to ensure that your fire alarm control panel supports the S-Quad protocol. Many 34000 series systems are legacy setups and may not be compatible without a panel upgrade or the use of an interface module.
What’s Required for an Upgrade
If you are upgrading from the 34000 series to S-Quad (including the S4-711), you will need to:
- Replace existing detector bases with S-Quad (S4-700 series) bases
- Re-address all detectors in line with S-Quad system requirements
- Confirm control panel compatibility or plan for a panel upgrade
⚠️ Important: The S4-711 is not a direct replacement for Gent 34000 series detectors. Base and panel compatibility must be confirmed.
Comparison: S4-711 vs S4-710
| Feature | S4-711 | S4-710 |
|---|---|---|
| Sensing Technology | Optical + Heat | Optical + Heat |
| False Alarm Immunity | High (dual-angle) | Standard (Single Sensing) |
| Installation | S-Quad base | S-Quad base |
| Maintenance | Annual | Annual |
| Replacement | 10 years | 10 years |
| Addressing | Soft | Soft |
Key Difference
The S4-711 offers significantly improved false alarm rejection and broader detection capability, making it the preferred choice for more complex environments.
Need Help?
If you need help confirming whether the Gent S4-711 is correct for your system, Fire Trade Supplies can provide technical guidance before purchase.
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Gent S4-711 FAQ'S
While both are multi-sensors, the S4-710 is a standard Optical-Heat detector. The S4-711 uses Dual-Angle Optical Scatter technology. This means the S4-711 is much better at distinguishing between real smoke and "nuisance" sources like steam or dust, making it the superior choice for hotel corridors or near bathrooms.
No, the S4-711 is the detector head only. To install it, you will need the S4-700 Common Base. This modular design allows you to swap heads for maintenance without rewiring the base.
The S4-711 has a Device Load Factor of 1. This is the lowest possible rating for an S-Quad sensor, allowing you to populate a full loop of up to 200 devices (subject to total loop current limits).
The S4-711 is designed for the Gent Vigilon and Vigilon Compact/Compact Plus addressable systems. It is a closed-protocol device and is not compatible with standard conventional fire panels or other addressable brands.
Flashing Green: Device is operating normally and communicating with the control panel.- Flashing Red: Indicates the detector is in alarm condition (fire detected).
- Flashing Amber/Yellow: Fault condition, such as contamination, sensor failure, or communication error.
- Steady Red: Detector is latched in alarm (may require reset from the panel).
- No LED: Device is not powered or not communicating with the loop.
These LED patterns help engineers and maintenance staff quickly identify the status of the detector during routine checks or fault-finding. For site-specific programming, the flash rates or colors may be customized, but the above are the standard factory defaults for the S-Quad range
- The Gent S4-711 is part of the S-Quad range, which uses a different protocol and base compared to the older Gent 34000 series detectors.
- Direct replacement (i.e., simply swapping the detector heads) is not possible. The S4-711 requires the S-Quad (S4-700 series) base, and the wiring may need to be adapted.
- The control panel must support the S-Quad protocol. Most 34000 series systems are legacy and may not be compatible with S-Quad devices without a panel upgrade or interface module.
- If you are upgrading a system from 34000 series to S-Quad (including S4-711), you will need to:
Replace the detector bases with S-Quad bases.Re-address the new detectors as per the S-Quad system requirements. Confirm that the fire alarm control panel is compatible with S-Quad devices, or plan for a panel upgrade.
About shipping
Orders for the s4-711 are typically dispatched from UK stock within 1-2 working days. Delivery times may vary depending on location and order volume. Full delivery options and costs are shown at checkout.
Yes. We supply the Gent S4-711 to customers in the UK and internationally. Export availability, delivery times, and costs vary by destination and are confirmed during checkout.
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