Gent Beam Sensor Transmitter
| Part no. | S4-34741 |
|---|---|
| Brand | Gent |
| Range | S4 Beam Detectors |
| Sub-range | Beams |
Image for illustration; item supplied may differ
At a glance
- Transmitting headRed lens retainer identifies the head used with an S4-34742 receiver.
- 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.
- Vigilon test inputOptional monitored keyswitch input at the transmitter base, enabled during commissioning; excludes backward-converted pairs.
- Bracket and base optionsFits an angle or parallel bracket with its sensor base, with one assembly for each head.
- Find Device indicationRed LEDs identify the transmitter when Find Device is activated from the panel.
Description
The Gent S4-34741 is the beam sensor transmitter for a Gent S4 beam pair on Vigilon and Nano systems. Its red lens retainer marks the transmitting head, which faces an S4-34742 receiver across the beam path. The pair detects smoke over 2m to 100m, with the range set by the receiver state. The transmitter takes its power from the loop and fits a base on an angle or parallel bracket. Its LEDs show the signal level as the pair is aligned. On Vigilon, a test keyswitch can connect to the transmitter base to trigger a test fire signal once that input has been enabled. Its body is 117mm across and 54mm deep.
The S4-34741 provides the transmitting end of an S4 beam sensor pair. Its red lens retainer distinguishes it from the black-retainer S4-34742 receiver. Both heads connect to the loop and face each other across the beam path. The receiver sets detection sensitivity and gives the local fire indication. The S4-34740 order code combines the transmitter and receiver as a pair.
Read the full technical description
The S4-34741 provides the transmitting end of an S4 beam sensor pair. Its red lens retainer distinguishes it from the black-retainer S4-34742 receiver. Both heads connect to the loop and face each other across the beam path. The receiver sets detection sensitivity and gives the local fire indication. The S4-34740 order code combines the transmitter and receiver as a pair.
The transmitter fits the sensor base on either an S4-34741-01 angle bracket or an S4-34741-03 parallel bracket. The angle bracket provides up to ±25° adjustment in each axis with its pivot stop centred. The parallel bracket provides up to ±8° in each axis. During alignment, the transmitter LEDs indicate signal level as its bracket is adjusted towards the receiver. Final receiver AutoGain is run from the panel.
On Vigilon, an optional test keyswitch connects to EM2 and C3 at the transmitter base. The circuit uses a 470Ω series resistor and a 10kΩ end-of-line resistor, with a maximum cable length of 15m. It is monitored for open and short circuits. Select the monitored test input during commissioning. Operation produces a test fire condition. This facility is unavailable on beam pairs converted for backward compatibility.
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 Find Device function makes the transmitter's red LEDs flash to identify its position.
The transmitter measures 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 and at -10°C to +50°C. The detector pair's path depends on the receiver setting: states 0 and 1 cover an ideal 12m to 100m, states 2 and 3 cover 5m to 100m, and states 4 and 5 cover 2m to 30m. LPCB approval covers states 0 to 3.
Specifications
| Product code | S4-34741 |
|---|---|
| Product form | Beam transmitter |
| 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 | Red |
| 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 |
| Test keyswitch support | Vigilon only; excludes backward-converted pairs |
| Test input terminals | EM2 and C3 at transmitter base |
| Test input cable limit | 15m |
| Test input resistors | 470Ω series and 10kΩ end-of-line |
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
- S4-34742Beam Sensor ReceiverOpposite head needed to form the detector pair.£575.88ex VAT£691.06 inc VATIn stock
FAQs
Which receiver works with the S4-34741 transmitter?
The S4-34741 works with the S4-34742 receiver to form an S4 beam sensor pair. The transmitter has a red lens retainer, while the receiver has a black one. Together they detect smoke across a path from 2m to 100m, with the applicable distance determined by the receiver state. The S4-34740 is the combined pair order code. Each head connects to the loop and mounts on its own base fixed to an angle or parallel bracket.
Can a test keyswitch connect to this transmitter?
Yes, on Vigilon systems a test keyswitch can connect to EM2 and C3 at the transmitter base. The monitored circuit uses a 470Ω series resistor and a 10kΩ end-of-line resistor, with a cable run of up to 15m. Enable the monitored test input during commissioning so switch operation generates a test fire condition. The circuit is monitored for open and short circuits. This keyswitch facility is unavailable on beam pairs converted for backward compatibility.
Which bracket can mount the transmitter?
The transmitter fits the base supplied with either the S4-34741-01 angle bracket or the S4-34741-03 parallel bracket. The angle bracket allows up to ±25° movement in both axes with its pivot stop in the centre position. The parallel bracket allows up to ±8° in both axes. The bracket adjusters aim the transmitter towards the receiver during alignment, and the locknuts secure the setting. Each bracket and base assembly carries one sensor head on the beam path.
Does the transmitter control the smoke sensitivity?
The receiver controls the smoke sensitivity for the pair. States 0 and 1 use a 50% signal reduction, states 2 and 3 use 25%, and states 4 and 5 use 10%. The transmitter supplies the beam and uses its LED display to help align the pair. Local fire indication is at the receiver, with the panel also indicating fire. The transmitter's red LEDs identify the device when Find Device is activated from the panel.
How is the transmitter used during alignment?
The transmitter is adjusted to face the receiver while its LEDs show the received signal level for the pair. Small changes to the bracket in each axis bring the display towards the highest green indication. For pairs without backward conversion, local AutoGain acts on the receiver before adjustment continues. The receiver end is then adjusted in the same way. Complete the process with receiver AutoGain from the panel controls. The distance between the heads is used when assessing the final gain value.