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Product

fiber optic cable seriesIEC 61757-2-2 DTS316L Hermetic FIMTØ 3.8 mm Fast Response

BRUsens DTS BSSA N Non-Metallic Stainless-Tube TemperatureLaser-welded 316L stainless-tube & aramid/PA/LSZH jacketed DTS temperature cable

BRUsens DTS BSSA N Non-Metallic Stainless-Tube Temperature Sensing Cable combining a hermetically laser-welded AISI 316L stainless-steel central FIMT with non-metallic aramid yarn reinforcement and a fast-response PA12/HDPE/LSZH.

Hermetic 316L FIMT
EN 54-22 / LSZH
Duct & Tray Routing
IEC 61757-2-2
Order designation
BRUsens DTS BSSA N-02MM02SM
Outer Ø
3.8 mm
Weight ≈
21 kg/km
Max. pull load
1,000 N
Crush rating
3,000 N/100mm
All sizes (4)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Sensing mode
Raman / BOTDA
Strain-free FIMT optical core
Outer Ø
3.8 to 4.2 mm
Compact fast-thermal-response
Thermal τ₆₃
≤ 1.8 s in water
Direct 316L tube heat transfer
Tensile load
1,000 N max
316L FIMT + aramid yarns
Crush rating
3,000 N/100 mm
Stainless-steel tube shield
Temperature
-40 to +85 °C
+150 °C short-term peak

Typical values for this cable type, based on IEC 61757-2-2 / IEC 60794-1-21 / EN 54-22 — confirmed in the datasheet and quotation for your order.

Application fit

Is BRUsens DTS BSSA N right for your machine?

Combines the moisture/hydrogen barrier and radial crush strength of a 316L stainless-steel tube with a lightweight non-metallic aramid + polymer outer sheath.

Fixed installation

Suitable

Clips onto cable trays, LNG tank walls, solar troughs, and industrial process piping.

TBM gantry & advancing tunnel reel

Suitable

EN 54-22 / IEC 60332-3-24 LSZH version acts as a linear heat detector on road and rail tunnel ceilings.

Immersion & wet locations

Suitable

Hermetic 316L stainless-steel FIMT withstands 30 MPa (300 bar) hydrostatic pressure.

Energy chain / drag chain

Not suitable

Static linear temperature sensor with metallic core; not for continuous flexing in drag chains.

Use HITRONIC PCF DUPLEX
Typical machinesRoad, Rail & Utility Tunnel Fire DetectionHV Export & Land Cable Conduit DTSLNG, Ammonia & Cryogenic Tank Leak DetectionConveyor Gallery Linear Heat DetectionDam Seepage & Hydrological Profiling

Construction

Layer by layer

BRUsens DTS BSSA N showing strain-free OM3/SM optical fibres with controlled excess length inside a laser-welded 316L stainless-steel FIMT, aramid yarn layer, and PA12/HDPE/LSZH outer sheath.

1234
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
1Strain-free DTS sensing fibres2 to 6 × 50/125 µm OM3 multimode and/or 9/125 µm G.652.D/G.657.A1 single-mode fibres with ≥ 0.2 % EFLDecouples mechanical cable tension from temperature readings
2Laser-welded 316L stainless-steel FIMTHermetically welded AISI 316L stainless-steel tube (Ø 1.8–2.2 mm, dry or gel-filled)3,000 N/100 mm crush resistance & 100 % moisture/hydrogen block
3Non-metallic aramid tensile layerHigh-modulus polyaramid yarns stranded over the 316L FIMT (no outer steel wires)1,000 N pulling strength while keeping OD down to 3.8 mm
4Fast-response outer sheathHalogen-free flame-retardant LSZH (Red/Orange), Polyamide 12 (PA12), or HDPEThin-wall extrusion for τ₆₃ ≤ 1.8 s thermal time constant

BSSA N-LSZH (Tunnel Fire LHD)

Red/Orange LSZH sheath (IEC 60332-3-24 / EN 54-22) for tunnel, tray and building fire detection

BSSA N-PA / HDPE (Duct & Dam)

Black PA12 or HDPE sheath for microduct blowing alongside HV power cables and dam drains

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on IEC 61757-2-2 / IEC 60794-1-21 / EN 54-22. Values for your order are confirmed in the datasheet and quotation.

Electrical

Sensing principle
Raman OTDR (MM) & Brillouin BOTDA/BOTDR (SM)
Temperature resolution
±0.1 °C to ±0.5 °C (interrogator-dependent)
Metallic cross-section
≈ 0.9 mm² 316L stainless tube (single-point earthing)

Thermal

Operating temperature
-40 °C to +85 °C (-196 °C LNG cryo dry-tube option)
Thermal response (τ₆₃)
≤ 1.8 s in water · ≤ 6.5 s in air
Short-term fire exposure
Up to +150 °C (sheath) / +400 °C (316L tube integrity)

Mechanical

Outer diameter
3.8 mm (2–4F) · 4.2 mm (6F)
Max. tensile load
1,000 N installation · 500 N permanent
Crush resistance
3,000 N / 100 mm
Min. bend radius
15 × OD static · 20 × OD dynamic

Optical

Multimode fibres
50/125 µm OM3 (≤ 2.4 / 0.6 dB/km @ 850/1300 nm)
Single-mode fibres
ITU-T G.652.D / G.657.A1 (≤ 0.35 / 0.21 dB/km)
Excess fibre length
0.20 % to 0.35 % strain-free inside 316L FIMT

Resistance

Hydrostatic pressure
30 MPa (300 bar) on 316L FIMT
Flame & smoke (LSZH)
IEC 60332-3-24, IEC 60754-2 & IEC 61034-2
Chemical resistance
PA12 / HDPE resists hydrocarbons, acids & brine

Reference standards

DTS & LHD standards
IEC 61757-2-2 & EN 54-22
Cable test standard
IEC 60794-1-21 & IEC 60794-1-22
RoHS & REACH
2011/65/EU & EC 1907/2006 compliant

Identification

Sheath colour
Red (Fire LHD), Orange (LSZH), or Black (PA/HDPE)
Fibre colour code
TIA-598-D 12-colour
Customs tariff (HS)
8544.7000

Sizes

4 standard BRUsens DTS BSSA N configurations

Dimensional and mechanical parameters for BSSA N stainless-tube temperature sensing cables.

Dimensions & mechanical ratings
Order designationFibre compliment & jacketOuter Ø
mm		Weight ≈
kg/km		Max. pull
N		Crush
N/100 mm		Enquiry
BSSA N — 316L FIMT + Aramid + Polymer Sheath
BRUsens DTS BSSA N-02MM2 × 50/125 OM3 · LSZH3.8221,0003,000
BRUsens DTS BSSA N-04MM4 × 50/125 OM3 · LSZH3.8231,0003,000
BRUsens DTS BSSA N-02MM02SM2 × OM3 + 2 × G.652.D SM · PA123.8211,0003,000
BRUsens DTS BSSA N-04MM02SM4 × OM3 + 2 × G.652.D SM · HDPE4.2261,2003,000
  • Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
  • Dry-FIMT version available for -196 °C LNG cryogenic tank leak monitoring where tube gel would freeze.

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 % eddy-current FIMT weld & OTDR testHermetic 316L weld and ≤ 2.4/0.6 dB/km (MM) / ≤ 0.35/0.21 dB/km (SM)Every drum length
Sample tests
EN 54-22 thermal response & fire classificationτ₆₃ ≤ 1.8 s in water and pass IEC 60332-3-24 flame testType qualification
Crush & 300 bar hydrostatic pressure test3,000 N/100 mm crush and 30 MPa pressure with Δα ≤ 0.05 dBType qualification

Inspection certificate

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

Product approvals

IEC 61757-2-2 & EN 54-22IEC 60332-3-24 LSZHRoHS 2 & REACH Compliant

Company certificates

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

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX BRUSENS DTS BSSA N 316L FIMT TEMPERATURE 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 DTS BSSA N Non-Metallic Stainless-Tube Temperature – technical datasheet4 sizes · construction, technical data, approvalsXLSXBRUsens DTS BSSA N spec data (Excel)All 4 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.

What does 'Non-Metallic' in BRUsens DTS BSSA N refer to if it contains a stainless-steel tube?
In the BRUsens naming convention, 'BSSA N' designates a stainless-steel loose tube (BSSA) with a Non-metallic peripheral tensile reinforcement (aramid yarns instead of outer steel wire armour 'M'). This keeps the cable light (22 kg/km), compact (Ø 3.8 mm), and fast-responding while preserving the hermetic 316L tube around the fibres.
Can BSSA N be blown into microducts alongside buried HV export power cables?
Yes. The Ø 3.8 mm low-friction PA12 or HDPE outer sheath is specifically sized for air-blowing into 8/5 mm or 10/6 mm SDR microducts cast into HV power cable banks for Real-Time Thermal Rating (RTTR).
Why specify a dry (gel-free) FIMT for cryogenic LNG tank leak detection?
At -162 °C to -196 °C LNG temperatures, standard thixotropic tube gels solidify and induce severe micro-bending loss on the optical fibres. Our dry-tube BSSA N-CRYO variant keeps attenuation stable down to -196 °C.
When should we choose BSTE/BSSA M instead of BSSA N?
Choose BSTE/BSSA M (with galvanized or stainless steel wire armour) whenever the cable is directly buried in rocky trenches, cast into concrete, or exposed to high pulling tensions (> 1,000 N).

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