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Product

Linear Heat Detection (LHD) Sensor CablesEN 54-28 / UL 521PA12 Nylon Outer JacketUV, Oil & Chemical LHD

SS-LDN Nylon-Jacketed Linear Heat Detection CablePA12 nylon-overjacketed UV-, oil- and chemical-resistant digital linear heat sensor cable

SS-LDN adds an extruded carbon-black UV-stabilised polyamide (PA12 nylon) protective outer jacket over the SS-LD digital linear heat detection core. Engineered for petrochemical floating-roof tanks, outdoor conveyors, chemical processing plants and coastal pie

68–138 °C Calibrated

PA12 Oil & Chemical

UV Weatherproof

Alarm Temp & Amb.

Order designation: SS-LDN-85 (85 °C Nylon LHD)
Outer Ø ≈: 4.2 mm
Copper weight: 12 kg/km
Total weight ≈: 27 kg/km
Min. bend R: 63 mm

All sizes (12)

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Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum

Alarm ratings: 68 / 85 / 105 /
Outer jacket: PA12 Nylon
Sensing cores: 2 × spring steel
Loop resistance: ≈100 Ω/km
Ambient range: -40 to +105 °C
Min. bend radius: 65 mm (≈15×OD)

Typical values for this cable type, based on EN 54-28 / UL 521 — confirmed in the datasheet and quotation for your order.

Application fit

Is SS-LDN right for your machine?

Purpose-built for petrochemical floating-roof storage tank rim seals, LNG/LPG pipe racks, chemical bunds, outdoor belt conveyors and marine jetties exposed to oils, fuels, solvents and direct sunlight.

Fixed installation

Suitable

Mounts on floating-roof tank rim brackets, chemical pipe racks and outdoor cable ladders.

Offshore platform & shipboard deck trays

Suitable

PA12 nylon jacket resists crude oil vapour, jet fuel, salt spray, ammonia and caustic washdowns.

TBM gantry & advancing tunnel reel

Suitable

Tough low-friction polyamide surface resists abrasion during long pulls through outdoor ducts.

Motorised monospiral reel

Not suitable

Spring-steel thermal sensing core is for fixed detection mounting only.

SS-LDS stainless braided LHD

Typical machinesPetrochemical floating-roof tanksOil refineries & LNG terminalsOutdoor mining & port conveyorsChemical & fertilizer plantsSolar rooftop & outdoor trays

Construction

Layer by layer

Two twisted spring-steel sensing conductors + calibrated heat-reactive polymer insulation + flame-retardant inner sheath + extruded UV-stabilised black PA12 nylon outer jacket.

Schematic, not to scale — generated from the layer data

#	Layer	Material & reference
1	Spring-steel sensing conductors	Two twisted high-tensile tinned copper-clad spring-steel wires under constant radial contact pressureEN 54-28
2	Calibrated thermo-reactive polymer	Temperature-calibrated thermoplastic polymer melting at 68, 85, 105 or 138 °CEN 54-28
3	Flame-retardant inner sheath	Primary moisture-blocking flame-retardant polymer inner jacketEN 54-28
4	PA12 nylon protective jacket	Extruded UV-stabilised carbon-black Polyamide 12 (PA12) chemical- and oil-resistant outer jacketEN 54-28

SS-LDN-68 (68 °C / 155 °F)

Max ambient +45 °C — outdoor covered conveyors, chemical warehouses and tank farms in temperate climates.

SS-LDN-85 (85 °C / 185 °F)

Max ambient +65 °C — direct-sunlight floating-roof tank rim seals, outdoor pipe racks and solar arrays.

SS-LDN-105 (105 °C / 221 °F)

Max ambient +85 °C — refinery process units, hot oil lines, desert tank rims and chemical reactors.

SS-LDN-138 (138 °C / 280 °F)

Max ambient +105 °C — high-temperature steam tracing manifolds and petrochemical reformer zones.

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on EN 54-28 / UL 521. Values for your order are confirmed in the datasheet and quotation.

Electrical

Max. operating voltage: 42 VDC / 30 VAC
Conductor DC resistance: ≈100 Ω/km per conductor (200 Ω/km loop)
Dielectric test voltage: 500 VAC rms for 1 minute

Thermal

Alarm temperature ratings: 68 °C · 78 °C · 85 °C · 105 °C · 138 °C
Max. continuous ambient temp.: 45 °C (68 °C) · 65 °C (85 °C) · 85 °C (105 °C) · 105 °C (138 °C)
Operating temperature floor: -40 °C

Mechanical

Nominal outer diameter: 4.2 mm ± 0.2 mm
Min. installation bend radius: 65 mm (≈15 × cable OD)
Abrasion & cut-through: High-hardness Shore D 72 PA12 nylon outer skin

Resistance

Hydrocarbon & solvent resistance: Resists crude oil, diesel, jet fuel, benzene, dilute acids & alkalis
UV weather resistance: Carbon-black stabilised PA12 per UL 1581 / ISO 4892 UV exposure
Flame retardancy: IEC 60332-1-2 / UL 1581 VW-1

Reference standards

Product standard: EN 54-28 & UL 521
Hazardous area suitability: Simple apparatus per IEC 60079-11 when connected via Zener/galvanic IS barrier

Identification

Outer jacket colour: Jet Black (UV-stabilised PA12) with colour-coded print legend
Core colours: Red & White insulated sensing cores

Sizes

12 standard configurations (SS-LDN)

Nominal dimensions, masses and electrical ratings for SS-LDN according to EN 54-28 / UL 521.

Dimensions & masses
Designation	Alarm Temp & Amb.	Core Ø mm	Outer Ø ≈ mm	Copper kg/km	Total weight ≈ kg/km	Min. bend R fixed mm
SS-LDN standard series
SS-LDN-68 (68 °C Nylon LHD)	68 °C PA12 (Amb ≤45 °C)	2×0.85 mm	4.2	12	27	63
SS-LDN-78 (78 °C Nylon LHD)	78 °C PA12 (Amb ≤55 °C)	2×0.85 mm	4.2	12	27	63
SS-LDN-85 (85 °C Nylon LHD)	85 °C PA12 (Amb ≤65 °C)	2×0.85 mm	4.2	12	27	63
SS-LDN-95 (95 °C Nylon LHD)	95 °C PA12 (Amb ≤70 °C)	2×0.85 mm	4.2	12	27	63
SS-LDN-105 (105 °C Nylon LHD)	105 °C PA12 (Amb ≤85 °C)	2×0.85 mm	4.3	12	28	64
SS-LDN-138 (138 °C Nylon LHD)	138 °C PA12 (Amb ≤105 °C)	2×0.85 mm	4.4	12	30	66
SS-LDN-68-MSG (68 °C + Messenger)	68 °C PA12 + SS Messenger	2×0.85 mm	6.8	12	48	102
SS-LDN-85-MSG (85 °C + Messenger)	85 °C PA12 + SS Messenger	2×0.85 mm	6.8	12	48	102
SS-LDN-105-MSG (105 °C + Messenger)	105 °C PA12 + SS Messenger	2×0.85 mm	6.9	12	49	104
SS-LDN-138-MSG (138 °C + Messenger)	138 °C PA12 + SS Messenger	2×0.85 mm	7.0	12	51	105
SS-LDN-85-4C (85 °C 4-Core PA12)	85 °C 4C Redundant PA12	4×0.85 mm	5.8	24	49	87
SS-LDN-105-4C (105 °C 4-Core PA12)	105 °C 4C Redundant PA12	4×0.85 mm	5.9	24	51	88

Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
Nominal outer diameters and weights are subject to manufacturing tolerances per EN 54-28 / UL 521.

Electrical data
Alarm Temp & Amb.	Max. DC R @ 20 °C Ω/km	Current in air A	Current in duct/tray A
68 °C PA12 (Amb ≤45 °C)	98.000	1	1
78 °C PA12 (Amb ≤55 °C)	98.000	1	1
85 °C PA12 (Amb ≤65 °C)	98.000	1	1
95 °C PA12 (Amb ≤70 °C)	98.000	1	1
105 °C PA12 (Amb ≤85 °C)	98.000	1	1
138 °C PA12 (Amb ≤105 °C)	98.000	1	1
68 °C PA12 + SS Messenger	98.000	1	1
85 °C PA12 + SS Messenger	98.000	1	1
105 °C PA12 + SS Messenger	98.000	1	1
138 °C PA12 + SS Messenger	98.000	1	1
85 °C 4C Redundant PA12	98.000	1	1
105 °C 4C Redundant PA12	98.000	1	1

Current ratings apply at +30 °C ambient in free air and +25 °C in enclosed tray/conduit.

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.

ConductorClass 5 stranding
Spark test100 % in-line
Lay-upCores, earth, fillers
SheathingInner, braid / screen, outer
Electrical testsAC voltage, resistance
DimensionsOD, wall thickness
Inspection documents & dispatchDrum & dispatch

Testing & inspection	Test value / reference	Frequency
Routine tests
500 VAC dielectric & loop DC resistance test	Zero fault prior to activation; 100 Ω/km ±3 % per core	100 % of reels
Sample tests
Fluid immersion & thermal response test	No jacket cracking after hydrocarbon immersion; exact trip temperature per EN 54-28	Batch sample
UV xenon-arc weathering & EN 54-28 response	Retains tensile strength and thermal trip accuracy after accelerated UV exposure	Type qualification

Inspection certificate

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

Product approvals

EN 54-28 CompliantUL 521 DesignIEC 60079-11 Simple Apparatus (with IS barrier)ISO 4892 UV Stabilised

Company certificates

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

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX SS-LDN-85 NYLON JACKETED LINEAR HEAT DETECTION CABLE 85C PA12 UV/OIL RES EN 54-28 [meter mark]

Delivery form: Fumigated export wooden drums or shrink-wrapped coils
Standard drum lengths: 500 m · 1000 m standard drums (cut lengths on request)
MOQ: 100 m (stock sizes) · 300–500 m (production)
Lead time: 2–4 weeks ex-works
Incoterms: EXW, FOB, CIF, DAP

Technical documents

Downloads

PDFSS-LDN Nylon-Jacketed Linear Heat Detection Cable – technical datasheet12 sizes · construction, technical data, approvals XLSXSS-LDN spec data (Excel)All 12 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 is a PA12 nylon outer jacket used on SS-LDN linear heat detection cable?

Standard PVC or LSZH sheaths can plasticiser-leach, swell or crack when exposed to crude oil vapours, organic solvents, acid mist or intense solar UV radiation. The extruded Polyamide 12 (PA12) outer jacket seals the inner sensing core against chemical attack and outdoor weathering.

Can SS-LDN be installed in ATEX / IECEx Zone 1 or Zone 2 hazardous areas?

Yes. Because a passive digital linear heat detection cable contains no energy-storing capacitance or inductance beyond basic line parameters, it classifies as 'Simple Apparatus' under IEC 60079-11 Clause 5.7 when monitored through an certified Ex ia / Ex ib intrinsic safety barrier.

Which temperature grade of SS-LDN is used on floating-roof oil storage tanks?

SS-LDN-85 (85 °C alarm) or SS-LDN-105 (105 °C alarm) is typically mounted around the secondary rim seal of floating-roof crude oil and naphtha tanks, where solar radiation on steel tank plates can push surface ambient temperatures above 55–65 °C.

Does the PA12 nylon overjacket significantly slow down thermal response?

No. The PA12 extrusion has a thin, high-density wall (~0.30 mm) tightly bonded over the inner sheath, meeting the thermal response window of EN 54-28 while preventing false alarms from chemical softening.

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SS-LDN Nylon-Jacketed Linear Heat Detection Cable

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Reel & motion:
- Reel type: 
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- Travel speed (m/min): 
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Datasheet Request a quote

SS-LDN Nylon-Jacketed Linear Heat Detection CablePA12 nylon-overjacketed UV-, oil- and chemical-resistant digital linear heat sensor cable

Fixed installation

Offshore platform & shipboard deck trays

TBM gantry & advancing tunnel reel

Motorised monospiral reel

SS-LDN-68 (68 °C / 155 °F)

SS-LDN-85 (85 °C / 185 °F)

SS-LDN-105 (105 °C / 221 °F)

SS-LDN-138 (138 °C / 280 °F)

Electrical

Thermal

Mechanical

Resistance

Reference standards

Identification

Inspection certificate

Product approvals

Company certificates

01Selected sizes

02Reel & motion

03Message for our engineers

SS-LD Digital LHD

SS-LDS Armoured LHD

Securiton SEC 15 / SEC 20

BS 7917 A FR