Gent Beam Sensor Receiver
| Part no. | S4-34742 |
|---|---|
| Brand | Gent |
| Range | S4 Beam Detectors |
| Sub-range | Beams |
Image for illustration; item supplied may differ
At a glance
- Receiving headBlack lens retainer identifies the head used with an S4-34741 transmitter.
- 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 S4-34742 is the beam sensor receiver for a Gent S4 beam pair on Vigilon and Nano systems. Its black lens retainer marks the receiving head, which faces an S4-34741 transmitter across a clear beam path. The pair detects smoke over 2m to 100m, with its range and response set at the receiver. The head takes power from the loop and fits a base on an angle or parallel bracket. Its LEDs help align the beam and show a local fire signal. A light shield can fit to the lens retainer where sunlight or strong light would reach the receiver. The shield is a separate accessory. Each receiver weighs about 105g.
The S4-34742 receives the beam from an S4-34741 transmitter. Its black lens retainer identifies the receiving head. The two heads form the S4-34740 beam sensor pair, with each mounted on its own bracket and sensor base. Both connect to the fire alarm loop. The receiver supplies the local fire indication, while the panel also indicates the fire condition.
Read the full technical description
The S4-34742 receives the beam from an S4-34741 transmitter. Its black lens retainer identifies the receiving head. The two heads form the S4-34740 beam sensor pair, with each mounted on its own bracket and sensor base. Both connect to the fire alarm loop. The receiver supplies the local fire indication, while the panel also indicates the fire condition.
The receiver controls the detection state. States 0 and 1 use a 50% signal reduction, with an ideal path of 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. State 0 is the factory setting, and state 15 disables detection. Day and night sensitivity states can be set separately.
A rapid 90% signal reduction in less than one second, sustained for 40 seconds, produces a fault in states 0, 2 and 4. In states 1, 3 and 5 it produces a fire condition. After commissioning, use the S4-34741-50 test cards for the chosen operating state. A fire test is indicated at the receiver and the panel.
The receiver fits the S4-34741-01 angle bracket with base or the S4-34741-03 parallel bracket with base. Alignment uses the LED signal display while the two ends are adjusted. Complete alignment with receiver AutoGain from the panel controls. Where sunlight or strong light reaches the receiver, the S4-34741-99 light shield pushes onto its black lens retainer and locks in place.
Vigilon configuration 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. The receiver is 117mm in diameter by 54mm deep and weighs approximately 105g. Its body colour is RAL 9010. The S4 beam range operates from 35V to 41V, with an operating temperature band of -10°C to +50°C.
Specifications
| Product code | S4-34742 |
|---|---|
| Product form | Beam receiver |
| 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 | 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
- S4-34741-0134740 Angle Bracket + BaseAngle bracket with base; alternative to the parallel bracket. One assembly per head.£137.54ex VAT£165.05 inc VATIn stock
- S4-34741-0334740 Parallel Bracket + BaseParallel bracket with base; alternative to the angle bracket. One assembly per head.£57.41ex VAT£68.89 inc VATIn stock
- S4-34741-50Obscuration test card setFor testing the commissioned pair.£23.52ex VAT£28.22 inc VATIn stock
- S4-34741-99Light Shields for Beam Receiver (pack of 5)Receiver-only shield where sunlight or strong light reaches the receiver; five per pack.£80.74ex VAT£96.89 inc VATIn stock
- S4-34741Beam Sensor TransmitterOpposite head needed to form the detector pair.£575.88ex VAT£691.06 inc VATIn stock
FAQs
Which transmitter forms a pair with this receiver?
The S4-34742 receiver works with the S4-34741 transmitter. The black lens retainer identifies the receiver and the red lens retainer identifies the transmitter. The two devices are also available together under the S4-34740 pair order code. Each connects to the loop and fits a base on its own angle or parallel bracket. Receiver settings determine the smoke sensitivity and applicable path distance. Fire is indicated locally at the receiver and also at the fire alarm panel.
Which sensitivity states can be set at the receiver?
States 0 and 1 use a 50% signal reduction and suit an ideal path of 12m to 100m. States 2 and 3 use 25% over 5m to 100m, while states 4 and 5 use 10% over 2m to 30m. LPCB approval covers states 0 to 3. The receiver starts at state 0 from the factory. State 15 disables detection. Day and night states are configured separately, or set alike for the same response throughout the day.
Does a blocked beam produce a fire or a fault?
The receiver state sets the response. A 90% signal reduction occurring in less than one second and lasting 40 seconds produces a fault in states 0, 2 and 4. The same obstruction produces a fire condition in states 1, 3 and 5. After commissioning, testing must match the selected state. For states 0 to 3, the S4-34741-50 card procedure uses the relevant 50% or 25% obscuration card, with cardboard used for the complete-blockage part of the test.
How does the light shield fit the receiver?
The S4-34741-99 light shield aligns with the receiver's black lens retainer and pushes into place until it locks with a click. It is used where direct sunlight or strong light is likely to reach the receiver. The shield must only be fitted at the receiving end of the pair. Each shield is 50mm in diameter by 75mm long and weighs approximately 14g. A pack contains five shields, with one fitted to each receiver that needs shielding.
How is receiver alignment completed?
The receiver and transmitter are adjusted in turn using their bracket adjusters and LED signal displays. For pairs without backward conversion, local AutoGain at either device acts on the receiver as the beam signal improves. The last AutoGain is run on the receiver from the panel controls, after which the green alignment LEDs turn off. The resulting gain is compared with the path distance. Fire testing then uses the card procedure for the selected receiver state, with indication at the receiver and panel.