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Product

fiber optic cable seriesIEC 61757-3-2 DASAC1 Duct / AC2 ArmouredΦ-OTDR Coupled

BRUsens DAS AC1 / AC2 Distributed Acoustic Sensing Fibre OpticCompact non-metallic (AC1) & wire-armoured (AC2) distributed acoustic sensing cables

BRUsens DAS AC1 / AC2 Distributed Acoustic Sensing Fibre Optic Cable series engineered for coherent Φ-OTDR vibration, pipeline leak, seismic and perimeter detection in microducts (AC1) or direct burial trenches (AC2).

Duct & Direct Burial
FIMT / Gel Coupled
High Acoustic Sensitivity
IEC 61757-3-2
Order designation
BRUsens DAS AC2-04SM
Outer Ø
6.8 mm
Weight ≈
78 kg/km
Max. pull load
5,500 N
Crush rating
5,000 N/100mm
All sizes (6)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Sensing mode
Φ-OTDR / DAS
Coherent Rayleigh phase sensing
Cable variants
AC1 & AC2
Non-metallic (AC1) / Armoured (AC2)
Outer Ø
4.5 / 6.8 mm
AC1 (4.5 mm) · AC2 (6.8 mm)
Tensile rating
1,200 / 5,500 N
FRP (AC1) or Steel Wire (AC2)
Crush rating
2,000 / 5,000 N
per 100 mm radial load
Temperature
-40 to +85 °C
Continuous buried/duct service

Typical values for this cable type, based on IEC 61757-3-2 / SEAFOM-MSP-02 / IEC 60794-1-21 — confirmed in the datasheet and quotation for your order.

Application fit

Is BRUsens DAS AC1 / AC2 right for your machine?

Dual-profile DAS family offering an all-dielectric 4.5 mm cable (AC1) for fences, conduits and HV corridors, and a 6.8 mm FIMT wire-armoured cable (AC2) for direct soil burial.

Fixed installation

Suitable

AC1 blows/pulls into existing ducts or clips to perimeter fences; AC2 buries directly in pipeline and rail trenches.

TBM gantry & advancing tunnel reel

Suitable

LSZH sheath option for tunnel wall acoustic monitoring and conveyor roller fault detection.

Immersion & wet locations

Suitable

AC2 laser-welded 316L FIMT withstands 150 bar hydrostatic pressure in boreholes and subsea approaches.

Energy chain / drag chain

Not suitable

Static distributed acoustic sensor cable; not intended for drag-chain flexing.

Use HITRONIC PCF DUPLEX
Typical machinesOil, Gas & Water Pipeline Leak DetectionPerimeter Fence & Border SecurityConveyor Belt Roller Bearing MonitoringHV Power Cable Route IntrusionBorehole Vertical Seismic Profiling (VSP)

Construction

Layer by layer

BRUsens DAS AC1 (all-dielectric FRP-reinforced) and AC2 (316L FIMT + galvanized steel wire armour) with acoustically coupled ITU-T G.652.D/G.657.A1 single-mode fibres.

1234
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
1Acoustically coupled sensing fibres2 to 12 ITU-T G.652.D / G.657.A1 single-mode fibres (+ optional OM3 multimode for DTS)≤ 0.20 dB/km @ 1550 nm for 50+ km Φ-OTDR spans
2Acoustic coupling buffer tubeHigh-modulus thermoplastic buffer (AC1) or laser-welded 316L stainless steel FIMT (AC2) with acoustic gelIsotropic radial-to-axial acoustic wave transfer
3FRP rods (AC1) or Steel Wire Armour (AC2)Peripheral aramid/FRP rods on AC1; helically stranded galvanized steel wires on AC21,200 N (AC1) or 5,500 N (AC2) tensile load
4Tight-extruded PA / HDPE / LSZH sheathUV-stabilised Polyamide, HDPE or flame-retardant LSZH bonded to strength layerEliminates air voids that attenuate high-frequency sound

BRUsens DAS AC1 (Non-Metallic)

Ø 4.5 mm all-dielectric acoustic cable for perimeter fences, HV ducts and EMI-sensitive zones

BRUsens DAS AC2 (FIMT + Wire Armour)

Ø 6.8 mm 316L FIMT + galvanized steel wire armoured cable for direct pipeline trench burial

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on IEC 61757-3-2 / SEAFOM-MSP-02 / IEC 60794-1-21. Values for your order are confirmed in the datasheet and quotation.

Electrical

Sensing principle
Coherent Rayleigh Φ-OTDR Distributed Acoustic Sensing
Frequency response
0.1 Hz to 10 kHz acoustic & seismic bandwidth
Dielectric immunity (AC1)
100 % metal-free for HV substation & fence runs

Thermal

Operating temperature
-40 °C to +85 °C
Installation temperature
-15 °C to +60 °C
Storage temperature
-40 °C to +85 °C

Mechanical

Nominal outer diameter
4.5 mm (DAS AC1) · 6.8 mm (DAS AC2)
Max. tensile load
1,200 N (AC1) · 5,500 N (AC2)
Crush resistance
2,000 N/100 mm (AC1) · 5,000 N/100 mm (AC2)
Min. bend radius
15 × OD (static) · 20 × OD (installation)

Optical

Fibre specification
ITU-T G.652.D / G.657.A1 (2 to 12 fibres)
Attenuation @ 1550 nm
≤ 0.20 dB/km
Attenuation @ 1310 nm
≤ 0.34 dB/km

Resistance

Water blocking
IEC 60794-1-22 F5B + 316L hermetic FIMT (AC2)
Hydrostatic pressure
Up to 15 MPa (150 bar) on AC2
UV & rodent protection
ISO 4892-2 UV black + steel wire armour (AC2)

Reference standards

DAS sensing standard
IEC 61757-3-2 & SEAFOM-MSP-02
Cable test standard
IEC 60794-1-21 & IEC 60794-1-22
RoHS & REACH
2011/65/EU & EC 1907/2006 compliant

Identification

Sheath colour
Black with Blue longitudinal stripe (orange LSZH optional)
Fibre colour code
TIA-598-D 12-colour
Customs tariff (HS)
8544.7000

Sizes

6 standard BRUsens DAS AC1 & AC2 configurations

Dimensional and mechanical ratings for non-metallic AC1 and wire-armoured AC2 acoustic sensing cables.

Dimensions & mechanical ratings
Order designationFibre configurationOuter Ø
mm		Weight ≈
kg/km		Max. pull
N		Crush
N/100 mm		Enquiry
BRUsens DAS AC1 — Non-Metallic (Fence & Duct)
BRUsens DAS AC1-04SM4 × G.657.A1 SM4.5221,2002,000
BRUsens DAS AC1-08SM8 × G.657.A1 SM4.8261,2002,000
BRUsens DAS AC1-12SM12 × G.657.A1 SM5.2311,5002,000
BRUsens DAS AC2 — FIMT + Steel Wire Armoured (Direct Burial)
BRUsens DAS AC2-04SM4 × G.652.D SM (FIMT)6.8785,5005,000
BRUsens DAS AC2-04SM02MM4 × SM (DAS) + 2 × OM3 (DTS)7.0825,5005,000
BRUsens DAS AC2-12SM12 × G.652.D SM (FIMT)7.5946,0005,000
  • Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
  • AC1 is metal-free for perimeter fences and HV power ducts; AC2 features a 316L stainless FIMT and galvanized steel wire armour.

Quality & approvals

Testing & inspection

Routine tests on every production length, sample and type tests per batch — documented on an EN 10204 3.1 inspection certificate.

  1. ConductorClass 5 stranding
  2. Spark test100 % in-line
  3. Lay-upCores, earth, fillers
  4. SheathingInner, braid / screen, outer
  5. Electrical testsAC voltage, resistance
  6. DimensionsOD, wall thickness
  7. Inspection documents & dispatchDrum & dispatch
Testing & inspectionTest value / referenceFrequency
Routine tests
100 % OTDR & Rayleigh backscatter trace @ 1550 nmAttenuation ≤ 0.20 dB/km and step-free backscatter uniformityEvery drum length
Sample tests
Acoustic phase sensitivity qualificationVerified radial acoustic coupling across 0.1 Hz to 10 kHzType qualification
Tensile & crush test (IEC 60794-1-21 E1 & E3)Up to 5,500 N pull and 5,000 N/100 mm crush with Δα ≤ 0.05 dBType qualification

Inspection certificate

Issued with every drum, listing the routine test results for that length.

Product approvals

IEC 61757-3-2 & SEAFOM-MSP-02IEC 60794-1-21 & ITU-T G.652.DRoHS 2 & REACH Compliant

Company certificates

ISO 9001ISO 14001ISO 45001VDE marks approvalUL / cULCE · LVD / EMC

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX BRUSENS DAS AC1/AC2 ACOUSTIC SENSING FO CABLE
Delivery form
Fumigated export wooden or steel drums
Standard drum lengths
1000 m · 2000 m · 4000 m (or custom cut lengths)
MOQ
500 m (standard) · 1000 m (custom build)
Lead time
2–4 weeks ex-works
Incoterms
EXW, FOB, CIF, DAP

Technical documents

Downloads

PDFBRUsens DAS AC1 / AC2 Distributed Acoustic Sensing Fibre Optic – technical datasheet6 sizes · construction, technical data, approvalsXLSXBRUsens DAS AC1 / AC2 spec data (Excel)All 6 sizes with dimensions and data, for your BOM or quotation
Revision
2026-10-20
Updated
2026-10-20

FAQ

Questions engineers ask first

Not covered here? Send your drawing — an engineer replies within 2 business hours.

When should we select BRUsens DAS AC1 versus BRUsens DAS AC2?
Select DAS AC1 (4.5 mm all-dielectric) when clipping to chain-link perimeter fences, blowing into microducts, or routing alongside high-voltage power cables where metallic induction must be avoided. Select DAS AC2 (6.8 mm 316L FIMT + steel wire armour) for direct trench burial along pipelines, railways and borders.
Why does acoustic sensing require a tightly coupled cable structure instead of standard loose tubes?
In standard telecom loose-tube cables, air gaps decouple ground vibrations from the glass fibre. BRUsens DAS AC1 and AC2 eliminate internal air voids and bond the outer jacket to the buffer tube so acoustic pressure waves (0.1 Hz to 10 kHz) induce clean, repeatable optical phase shifts.
Can DAS AC2 be used in vertical seismic profiling (VSP) boreholes?
Yes. The hermetically welded 316L stainless-steel FIMT and galvanized steel wire armour on DAS AC2 withstand 15 MPa (150 bar) hydrostatic pressure and 5.5 kN tensile load for borehole cementing or clamping.
What drum lengths are available for long pipeline routes?
Both DAS AC1 and AC2 are supplied in continuous splice-free lengths of 2,000 m, 4,000 m and up to 6,000 m per drum.

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BRUsens DAS AC1 / AC2 Distributed Acoustic Sensing Fibre Optic

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