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Product

fiber optic cable series-196 to +300 °CPolyimide Coated Fibre316L FIMT + PFA

BRUsens DTS BSTE HT High-Temperature Distributed TemperatureHigh-temperature (-196 °C to +300 °C) polyimide-fibre 316L FIMT DTS sensing cable

BRUsens DTS BSTE HT High-Temperature Distributed Temperature Sensing Cable with polyimide- or gold-coated high-temperature optical fibres hermetically sealed in a dry laser-welded 316L/Inconel FIMT with stainless-steel wire armour.

+300 °C Continuous
300 bar Hermetic FIMT
Sour Gas & Acid Resistant
IEC 61757-2-2
Order designation
BRUsens DTS BSTE HT-PFA-04
Outer Ø
4.80 mm
Weight ≈
56 kg/km
Max. tensile load
4,500 N
Max. temperature
260 °C
All sizes (4)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Temp. range
-196 to +300 °C
Polyimide fibre (+700 °C Au opt)
Fibre coating
Polyimide / Carb
Hydrogen-darkening resistant
Metallic tube
316L / Inconel 6
Dry gas-buffered laser weld
Tensile load
4,500 to 8,000 N
316L stainless wire armour
Crush rating
6,000 N/100 mm
Downhole & kiln clamping
Pressure rating
Up to 50 MPa
500 bar downhole hydrostatic

Typical values for this cable type, based on IEC 61757-2-2 / IEC 60793-2 / ASTM A240 (316L) — confirmed in the datasheet and quotation for your order.

Application fit

Is BRUsens DTS BSTE HT right for your machine?

Built for extreme thermal, chemical and pressure environments where standard acrylate-coated fibres (+85 °C limit) and gel-filled tubes degrade or carbonise.

Furnace, kiln & high-temp zone

Suitable

Monitors rotary kiln shells, reformer furnaces, steam pipelines, and exhaust flues up to +300 °C.

Drilling jumbo & rotary mast feed

Suitable

Clamps to geothermal, SAGD steam-assisted oil well, and CCS injection tubing strings.

Immersion & wet locations

Suitable

316L / Inconel 625 FIMT and PFA fluoropolymer jacket resist sour brine, H₂S and 500 bar pressure.

Energy chain / drag chain

Not suitable

Static high-temperature industrial/downhole sensor; not for dynamic drag chains.

Use HITRONIC PCF DUPLEX
Typical machinesGeothermal & SAGD Downhole Well MonitoringRefinery, Petrochemical & Steam PipelinesCement Kiln, Steel Furnace & Refractory SHMNuclear Reactor & Molten Salt Loop PipingLNG Cryogenic (-196 °C) Transfer Lines

Construction

Layer by layer

BRUsens DTS BSTE HT showing hermetically carbon + polyimide coated 50/125 µm and 9/125 µm fibres in a dry nitrogen-purged 316L stainless-steel FIMT, 316L wire armour, and optional PFA fluoropolymer outer sheath.

1234
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
1High-temperature polyimide / carbon-coated fibres2 or 4 × 50/125 µm graded-index MM and/or 9/125 µm SM silica fibres with hermetic pyrolytic carbon inner barrier and +300 °C polyimide coatingPrevents H₂ ingression darkening and thermal coating strip
2Dry laser-welded 316L / Inconel FIMTGel-free, nitrogen-flushed AISI 316L (or Inconel 625) seamless laser-welded tube with ≥ 0.3 % EFLNo gel coking at +300 °C or freezing at -196 °C
3AISI 316L stainless-steel wire armourHelically stranded corrosion-resistant 316L stainless-steel armour wires4.5–8.0 kN tensile strength & 6,000 N/100 mm crush
4PFA / FEP fluoropolymer or bare 316L finishExtruded Perfluoroalkoxy (PFA, +260 °C continuous / +300 °C peak) or bare passivated 316L stainless steel (+300 °C)Complete chemical inertness to acids, solvents & sour gas

BSTE HT-PFA (-196 to +260/+300 °C)

316L FIMT + 316L wire armour + translucent Amber/Red PFA fluoropolymer jacket for chemical plants & wells

BSTE HT-BARE316L (-196 to +300 °C)

Bare passivated 316L stainless-steel armoured cable without polymer jacket for furnace walls & steam headers

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on IEC 61757-2-2 / IEC 60793-2 / ASTM A240 (316L). Values for your order are confirmed in the datasheet and quotation.

Electrical

Sensing principle
Raman OTDR (50/125 MM) & Brillouin/OFDR (9/125 SM)
Temperature accuracy
±0.2 °C to ±1.0 °C across -196 to +300 °C
Hydrogen darkening block
Hermetic carbon-coated fibre + welded 316L FIMT

Thermal

Continuous operating temp.
-196 °C to +260 °C (PFA) · -196 °C to +300 °C (Bare 316L)
Ultra-high-temp option
Up to +650 °C with gold-coated fibre in Inconel tube
Thermal response (τ₆₃)
≤ 1.2 s (Bare 316L) · ≤ 2.2 s (PFA jacketed)

Mechanical

Outer diameter
3.8 mm (Bare 316L) · 4.8 mm to 6.35 mm (1/4" PFA)
Max. tensile load
4,500 N to 8,000 N
Crush resistance
6,000 N / 100 mm
Min. bend radius
15 × OD static · 20 × OD dynamic

Optical

High-temp MM fibre
50/125 µm graded-index Carbon/Polyimide (≤ 3.0 dB/km @ 850 nm)
High-temp SM fibre
9/125 µm Carbon/Polyimide (≤ 0.50 dB/km @ 1550 nm)
Excess fibre length
0.30 % to 0.50 % inside dry FIMT for thermal expansion

Resistance

Hydrostatic pressure
Up to 50 MPa (500 bar) downhole rating
Chemical & sour gas
PFA + 316L/Inconel resists H₂S, CO₂, HCl & steam
Flame & non-combustibility
IEC 60332-1-2 (PFA) · Non-combustible Class A1 (Bare)

Reference standards

DTS sensor standard
IEC 61757-2-2 Distributed Temperature Sensing
Metallurgy standard
ASTM A240 (AISI 316L) / ASTM B444 (Inconel 625)
RoHS & REACH
2011/65/EU & EC 1907/2006 compliant

Identification

Outer appearance
Translucent Red/Amber PFA or bright passivated 316L
Fibre identification
High-temp ring-marked polyimide coatings
Customs tariff (HS)
8544.7000

Sizes

4 standard BRUsens DTS BSTE HT high-temperature models

Dimensional, thermal and mechanical ratings for -196 °C to +300 °C (and +650 °C Au) DTS sensing cables.

Dimensions & temperature ratings
Order designationFibre & armour constructionOuter Ø
mm		Weight ≈
kg/km		Max. load
N		Max. temp
°C		Enquiry
High-Temperature Polyimide & Metal-Coated DTS Cables
BRUsens DTS BSTE HT-PFA-042×MM + 2×SM Polyimide · 316L + PFA4.80564,500260
BRUsens DTS BSTE HT-1/4-PFA2×MM + 2×SM C/Polyimide · 1/4" Downhole6.351158,000260
BRUsens DTS BSTE HT-BARE-042×MM + 2×SM Polyimide · Bare 316L Armour3.80485,000300
BRUsens DTS BSTE HT-AU-INC2×MM Gold-Coated · Inconel 625 FIMT3.20384,000650
  • Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
  • All BSTE HT tubes are gel-free (dry nitrogen buffered) to prevent gel decomposition above +100 °C or solidification at -196 °C.

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 % helium/eddy-current FIMT leak test & OTDR traceZero pinhole defects and verified 850/1300/1550 nm attenuationEvery spool length
Sample tests
+300 °C thermal cycling & hydrogen aging testStable Raman Stokes/anti-Stokes ratio after 1,000 h @ +300 °CType qualification
500 bar hydrostatic & 6,000 N/100 mm crush testZero tube collapse or optical step lossType qualification

Inspection certificate

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

Product approvals

IEC 61757-2-2 High-Temp DTSASTM A240 (316L) & NACE MR0175RoHS 2 & REACH Compliant

Company certificates

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

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX BRUSENS DTS BSTE HT +300C 316L FIMT
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 BSTE HT High-Temperature Distributed Temperature – technical datasheet4 sizes · construction, technical data, approvalsXLSXBRUsens DTS BSTE HT 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.

Why must high-temperature DTS cables use dry (gel-free) stainless-steel tubes and carbon/polyimide-coated fibres?
Standard acrylate fibre coatings oxidize and strip above +85 °C, while thixotropic hydrocarbon gels decompose and outgas hydrogen above +100 °C. BSTE HT combines a hermetic pyrolytic carbon + polyimide fibre coating inside a dry nitrogen-purged 316L tube so fibres operate reliably from -196 °C to +300 °C.
How does the carbon inner barrier prevent hydrogen darkening in geothermal and oil wells?
At elevated temperatures (+150 °C to +300 °C), free hydrogen ions (H₂) can diffuse through metal walls and react with germanium dopants in the silica core, causing severe attenuation at 1300–1550 nm. The 50 nm pyrolytic carbon layer hermetically seals the glass surface against H₂ ingress.
What is the standard 1/4-inch (6.35 mm) BSTE HT-1/4-PFA variant used for?
A 6.35 mm (0.250 in) outer diameter matches standard oilfield and geothermal downhole tubing clamps, blow-out preventer (BOP) pack-offs and wellhead compression fittings.
Can BSTE HT be used above +300 °C?
Yes. For reformer tubes, exhaust stacks and nuclear/solar molten-salt loops up to +650 °C, specify the BSTE HT-AU-INC model featuring gold-coated silica fibres inside an Inconel 625 tube.

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