Gent Beam Sensor Pair (Transmitter and Receiver) excl bracket and Base
| Part no. | S4-34740 |
|---|---|
| Brand | Gent |
| Range | S4 Beam Detectors |
| Sub-range | Beams |
Image for illustration; item supplied may differ
At a glance
- Paired beam detectionOne transmitter and one receiver detect smoke across the beam path.
- Loop connectionEach sensor connects to the fire alarm loop through its base.
- LED alignment displayThe transmitter and receiver display signal level while the brackets are adjusted.
- Receiver state selectionReceiver settings select the sensitivity and response to sudden beam obstruction.
- Bracket and base optionsFits an angle or parallel bracket with its sensor base, with one assembly for each head.
- Receiver light shieldThe S4-34741-99 shield locks onto the receiver where sunlight or strong light reaches it.
Description
The Gent S4-34740 beam sensor pair detects smoke across a clear path from 2m to 100m in Vigilon and Nano systems. It has a transmitter with a red lens retainer and a receiver with a black lens retainer. Each head takes its power from the loop and fits a base on an angle or parallel bracket. The brackets and bases are separate from the pair. LEDs on both heads help align the beam, with the final gain set at the panel. The receiver controls the smoke sensitivity and gives the local fire signal. State selection sets the path range and response to a blocked beam. Each head weighs about 105g.
The S4-34740 combines the S4-34741 transmitter and S4-34742 receiver. The two heads face each other across the protected path and connect to the fire alarm loop. Each head needs a bracket with its sensor base: the S4-34741-01 angle bracket or S4-34741-03 parallel bracket. Two bracket and base assemblies are needed for a complete pair, with the type selected for each end.
Read the full technical description
The S4-34740 combines the S4-34741 transmitter and S4-34742 receiver. The two heads face each other across the protected path and connect to the fire alarm loop. Each head needs a bracket with its sensor base: the S4-34741-01 angle bracket or S4-34741-03 parallel bracket. Two bracket and base assemblies are needed for a complete pair, with the type selected for each end.
Receiver states set both sensitivity and the response to sudden obstruction. States 0 and 1 use a 50% signal reduction and an ideal path of 12m to 100m; states 2 and 3 use 25% and 5m to 100m. States 4 and 5 use 10% and 2m to 30m. LPCB approval covers states 0 to 3. State 0 is the factory setting. Day and night settings can be set separately at the receiver.
Alignment uses the LEDs on both heads while the bracket adjusters move each end towards the best signal. Local AutoGain operates on the receiver in pairs that have not been converted for backward compatibility. Finish the process with receiver AutoGain from the panel controls. The receiver gives the local fire indication, and the panel also indicates fire. The S4-34741-50 test cards provide obscuration tests after commissioning, with the card selected for the receiver state.
Vigilon commissioning uses Commissioning Tool V1.26 or later. Nano beam configuration features require Nano Commissioning Tool V2.0.7.1 and panel firmware V2.56 or later. An optional monitored test keyswitch connects to the transmitter on Vigilon systems, with a maximum 15m cable run. Its input must be enabled during commissioning. This keyswitch test is unavailable on pairs converted for backward compatibility.
Each sensor head is 117mm in diameter and 54mm deep, weighs approximately 105g and has a RAL 9010 body colour. The S4 beam range operates from 35V to 41V, with an operating temperature band of -10°C to +50°C. An S4-34741-99 light shield fits the receiver where sunlight or strong light reaches it. The shield locks onto the black lens retainer.
Specifications
| Product code | S4-34740 |
|---|---|
| Product form | Transmitter and receiver pair |
| System compatibility | Vigilon and Nano, at required panel firmware |
| Power source | Loop powered |
| Optical pairing | S4-34741 transmitter with S4-34742 receiver |
| Pair detection path | 2-100m, according to receiver state |
| Lens retainer | Transmitter red; receiver black |
| Sensor dimensions | 117mm diameter × 54mm depth, each head |
| Sensor weight | Approximately 105g per head |
| Sensor body colour | RAL 9010 |
| Mounting base | Part of angle or parallel bracket assembly |
| Angle bracket option | S4-34741-01, with base |
| Parallel bracket option | S4-34741-03, with base |
| S4 beam range voltage | 35-41V |
|---|---|
| S4 beam range operating temperature | -10°C to +50°C |
| S4 beam range storage temperature | -20°C to +70°C |
| S4 beam range humidity | Up to 95% non-condensing at +5°C to +45°C |
| Alignment display | Signal-level LEDs on both sensor heads |
| Final alignment gain | Receiver AutoGain from panel controls |
| Local fire indication | Receiver only |
| Test card accessory | S4-34741-50 |
| Factory receiver state | 0 |
| Pair LPCB-approved states | 0, 1, 2 and 3 |
| Receiver day/night states | Separately configurable |
| Receiver light shield | S4-34741-99 |
Specifications per manufacturer documentation, subject to change. E&OE.
Standards and approvals
| Standard | What it covers |
|---|---|
| EN 54-12:2002 (paired detector) | |
| EN 54-17:2005 + AC:2007 (paired detector) | |
| LPCB approved (paired detector, states 0-3) |
Approval body: Loss Prevention Certification Board (BRE Global Limited).
Documents
| Document | Type | Size | Download |
|---|---|---|---|
| Installation manual (S4-34740, S4-34741, S4-34742) | Installation | 4.9 MB | Download PDF |
Optional accessories
- S4-34741Beam Sensor TransmitterS4-34741 - Beam Sensor Transmitter (only) component of the pair£575.88ex VAT£691.06 inc VATIn stock
- S4-34742Beam Sensor ReceiverS4-34742 - Beam Sensor Receiver (only) component of the pair£575.88ex VAT£691.06 inc VATIn stock
- S4-34741-99Light Shields for Beam Receiver (pack of 5)S4-34741-99 - Light Shield for Beam Receiver£80.74ex VAT£96.89 inc VATIn stock
- S4-34741-50Obscuration test card setS4-34741-50 - Obscuration Test Card Set£23.52ex VAT£28.22 inc VATIn stock
- S4-34800Vigilon Manual Call Point with Glass Element IP 43 (excludes back box)Listed within the '0 - SQuad' device family on a Vigilon loop (alongside S4-34800 MCP, S4-£78.94ex VAT£94.73 inc VATIn stock
- S4-711S4 Dual Optical Heat SensorListed within the '0 - SQuad' device family on a Vigilon loop (alongside S4-34800 MCP, S4-£65.78ex VAT£78.94 inc VATIn stock
- S4-710S4 Optical Heat SensorListed within the '0 - SQuad' device family on a Vigilon loop (alongside S4-34800 MCP, S4-£53.23ex VAT£63.88 inc VATIn stock
- VIG-LPC-ENLoop Card for VIGPLUS-24 and VIGPLUS-72 Vigilon Panels (EN54)Appears in Vigilon loop-load / power-budget calculators vig-lpc and vig-lpc-en as a loop d£461.15ex VAT£553.38 inc VATIn stock
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- VIG-LPCLoop Card for VIG1-24 and VIG1-72 Vigilon Panels (EN54). Supports 3400, 34000 & Pre-VAD Squad devices.Appears in Vigilon loop-load / power-budget calculators vig-lpc and vig-lpc-en as a loop d£1,492.13ex VAT£1,790.56 inc VATIn stock
FAQs
What does the S4-34740 pair include?
The S4-34740 combines one S4-34741 transmitter and one S4-34742 receiver. The transmitter has a red lens retainer and the receiver has a black one. Each head needs its own sensor base on a mounting bracket, with the bracket and base assemblies supplied separately from this pair. The mounting choices are the S4-34741-01 angle bracket with base and S4-34741-03 parallel bracket with base. Each assembly carries one head, so the complete pair uses two assemblies.
How does the selected state affect the detection distance?
The receiver state determines the ideal beam path and sensitivity. States 0 and 1 use a 50% signal reduction over 12m to 100m. States 2 and 3 use 25% over 5m to 100m. States 4 and 5 use 10% over 2m to 30m. LPCB approval covers states 0 to 3. The factory setting is state 0. Day and night states are configured at the receiver, with matching settings used for the same response throughout the day.
How is the pair aligned during commissioning?
Start with the transmitter and receiver roughly facing each other, then run AutoGain on the receiver at the panel. Activate alignment and adjust the transmitter bracket to improve the green LED signal display. For pairs without backward conversion, run local AutoGain and adjust the receiver. Continue until further adjustment gives no improvement, then finish with receiver AutoGain from the panel controls. The gain relates to the distance between the two heads, so the path length forms part of the alignment setup.
How can the S4-34740 be tested?
After commissioning, the S4-34741-50 test cards obscure the beam to exercise the selected receiver state. Use a 50% card for the fire test in states 0 and 1, or a 25% card in states 2 and 3. Blocking the beam with cardboard for 40 seconds produces a fault in states 0 and 2, but a fire response in states 1 and 3. A fire indication appears at the receiver and at the panel.
When does the pair need a light shield?
A light shield is fitted at the receiver where sunlight or strong light is likely to reach its optical path. The S4-34741-99 shield pushes onto the receiver's black lens retainer and locks into place with a click. It is a receiver accessory and must not be fitted to the transmitter. The shields are supplied in packs of five. The pair still uses its transmitter and receiver on their own bracket and base assemblies, with alignment completed through the panel.