S4 Self Test Detectors
Gent S4T-771-S Self-Test Dual Optical Heat + Sounder
- Operating voltage
- 35V - 48V
- Current consumption
- 2 mA average and 4.5 mA maximum in Turbo mode (Refer to Battery Standby and Loop Load Calculator Tool.)
- Isolator data
- Vmax 48 V; IC max 0.8 A; Vnom 40 V; IS max 1.25 A; Vmin 35 V; IL max 50 uA; Vso max 16 V; Zc max 0.13 Ω; Vso min 8 V
- Dimensions
- Sensor head: 117 mm diameter by 63 mm height (with Base the height increases to 70 mm)
- Weight
- Sensor head only: 152 g (with Standard base - 212 g)
- Ambient operating temperature
- -10 °C to +50 °C
- Ingress protection
- IP21C
Required to operate
Needed to install, power or certify this product.
Base - Common for all S-Quad Sensors
Mounting base common to all S-Quad Self-Test sensors
Overview
What it is and how it fits the system.
The Gent S4T-771-S is an S4 SELF-TEST Dual Optical Heat Sensor and Sounder from the S-Quad Self-Test (S4T) series, pairing dual optical and heat detection with an integrated sounder. It operates on a 35V-48V loop, drawing 2mA average (4.5mA in Turbo mode), and is rated IP21C. The sensor head measures 117mm in diameter by 63mm high and weighs 152g.
Technical overview
The Gent by Honeywell S4T-771-S is an S4 SELF-TEST Dual Optical Heat Sensor and Sounder from the S-Quad Self-Test (S4T) series, combining dual optical and heat detection with an integrated sounder. It operates on a 35V-48V loop, drawing 2mA average current (4.5mA maximum in Turbo mode), and is rated IP21C for ingress protection. The sensor head measures 117mm in diameter by 63mm high, increasing to 70mm when mounted with the standard base, and weighs 152g sensor head only (212g with base).
Certifications include EN54, LPCB, UKCA and CE approvals. The device functions in ambient operating temperatures from -10°C to +50°C and storage temperatures from -20°C to +65°C, with relative humidity up to 95% non-condensing between +5°C and +45°C. Air velocity tolerance ranges from 0 to 20m/s for fire detection and 0 to 1.5m/s around the device, with Bluetooth connectivity effective up to 10m. Compatible accessories include the S4-700 mounting base, S4-705 IP21 base covers, S4-FLUSH semi-flush mounting kit, and 13449-01 remote LED.
Specifications
Full technical data for this part.
| Operating voltage | 35V - 48V |
|---|---|
| Current consumption | 2 mA average and 4.5 mA maximum in Turbo mode (Refer to Battery Standby and Loop Load Calculator Tool.) |
| Isolator data | Vmax 48 V; IC max 0.8 A; Vnom 40 V; IS max 1.25 A; Vmin 35 V; IL max 50 uA; Vso max 16 V; Zc max 0.13 Ω; Vso min 8 V |
| Dimensions | Sensor head: 117 mm diameter by 63 mm height (with Base the height increases to 70 mm) |
| Weight | Sensor head only: 152 g (with Standard base - 212 g) |
| Ambient operating temperature | -10 °C to +50 °C |
| Storage temperature | -20 °C to +65 °C |
| Relative humidity | 95 % non-condensing (+5 °C to +45 °C) |
| Ingress protection | IP21C |
| Colour | White : RAL 9010 Black : RAL 9005 |
| Enclosure | Terluran GP-35 (ABS) for outer housing |
| Air velocity for fire detection | 0 to 20 m/s |
| Air velocity around device | 0 to 1.5 m/s |
| Bluetooth range | 10m |
Specifications sourced from manufacturer documentation.
Specifications per manufacturer documentation, subject to change — E&OE. Spotted an inaccuracy? Let us know
Enhancements (optional)
Optional additions — this product works without them.
S-Quad Semi-Flush Mounting Kit
Semi-flush mounting kit for S-Quad Self-Test device
Remote LED (for use with common base S4-700)
External repeat LED driven by device I/O
Compare variants
Alternatives in the same range — pick the variant that fits your install.
S4 SELF TEST Optical Heat Sensor + Sounder
