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Product

IEC 60584-3 Type KX thermocouple cableIEC 60584-3 / ANSI MC96.1NiCr (+) / NiAl (−) True KXClass 1 (±1.5 °C) · −25…+200 °C

KX / Type K extension Thermocouple CableTrue NiCr / NiAl (Type K) Class 1 & Class 2 thermocouple extension cable

Precision Type KX thermocouple extension cable built to IEC 60584-3 and ANSI MC96.1 with true Nickel-Chromium (+ NiCr) and Nickel-Aluminium (− NiAl) conductors, Class 1 (±1.5 °C) tolerance, Al/PET screen and PVC, LSZH, FEP or SWA construction.

Low-EMC design
EMC screen
Flame-retardant
Oil-resistant
Order designation
KX-PVC-PiMF 4×2×1.0
Outer Ø ≈
12.8 mm
Total weight ≈
212 kg/km
Min. bend R (fixed)
96 mm
Configuration
4×2×1.0 mm² (7/0.43)
All sizes (16)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Alloy pair
NiCr (+) / NiAl
90Ni10Cr (+) / 95NiMnAlSi (−)
EMF tolerance
Class 1: ±1.5 °C
±25 µV · Class 2: ±2.5 °C
Loop resistance
≈ 1.00 Ω/m/pair
at 1.0 mm² (0.29 + 0.71 Ω/m)
IEC colour code
+ Green / − Wh
Green outer jacket (or Ex-i Blue)
ANSI colour code
+ Yellow / − Red
Yellow outer jacket (ASTM E230)
Junction temp.
−25…+200 °C
true KX alloy EMF calibration

Typical values for this cable type, based on IEC 60584-3 / ANSI MC96.1 / ASTM E230 — confirmed in the datasheet and quotation for your order.

Application fit

Is KX / Type K extension right for your machine?

Connects Type K (NiCr-NiAl) thermocouple heads to DCS temperature cards, transmitters and furnace controllers without cold-junction thermoelectric error.

Fixed installation

Suitable

Available in unarmoured PVC, XLPE/LSZH and high-temperature FEP/PTFE for trays, conduits and furnace heads.

TBM gantry & advancing tunnel reel

Suitable

SWA armoured execution (KX-XLPE-SWA / KX-PVC-SWA) is rated for direct trench burial in refineries.

Offshore platform & shipboard deck trays

Suitable

UV-stabilised outer sheath and moisture-resistant insulation protect millivolt EMF signals outdoors.

Energy chain / drag chain

Not suitable

Solid NiCr/NiAl alloys work-harden under continuous flexing; use stranded flexible KX only for occasional movement.

PUR Drag-Chain Control Cable
Typical machinesPetrochemical Cracking & Reformer FurnacesGas Turbines, Boilers & Power GenerationSteel, Aluminium & Heat-Treatment FurnacesGlass, Ceramic & Cement KilnsChemical Reactors & Autoclave Monitoring

Construction

Layer by layer

Shown: KX-PVC-PiMF 4×2×1.0 mm² (IEC 60584-3) with Class 1 stranded NiCr (+) / NiAl (−) conductors, Green (+) / White (−) numbered insulation, individual & collective Al/PET screens and Green RAL 6018 outer sheath.

12345
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
1True Type KX thermocouple alloy conductorsPositive (+): Nickel-Chromium (NiCr, non-magnetic) · Negative (−): Nickel-Aluminium (NiAl, slightly magnetic), solid or 7-wire strandedIdentical chemical composition to the Type K thermocouple sensor across −25 °C to +200 °C
2Colour-coded core insulation105 °C heat-resistant PVC, +90 °C XLPE, or +200/+260 °C FEP/PTFE (IEC: + Green / − White; ANSI: + Yellow / − Red)High insulation resistance prevents millivolt shunt error
3Individual & collective Al/PET screensAluminium/PET laminated tape + 0.5 mm² tinned copper drain wire (OS or PiMF+OS)Rejects 50/60 Hz hum and thyristor heater noise on low-level ~41 µV/°C signals
4Optional SWA or tinned copper braidUnarmoured, tinned copper wire braid (CY/SY), or Galvanised Steel Wire Armour (SWA)Mechanical protection tailored to indoor tray, furnace head or underground trench
5Outer jacket (IEC Green, ANSI Yellow or Ex-i Blue)Flame-retardant PVC, Low-Smoke Zero-Halogen (LSZH), or fluoropolymer FEP/PTFEIEC 60332-1-2 / IEC 60332-3-24 flame retardant

KX — IEC 60584-3 (Green/White)

Positive (+) Green, Negative (−) White, Outer Jacket Green (or Blue for Ex-i)

KX — ANSI MC96.1 (Yellow/Red)

Positive (+) Yellow, Negative (−) Red, Outer Jacket Yellow per ASTM E230

KX-FEP / KX-SWA

+200 °C FEP fluoropolymer for hot furnace zones or SWA armoured for refinery trenches

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on IEC 60584-3 / ANSI MC96.1 / ASTM E230. Values for your order are confirmed in the datasheet and quotation.

Electrical

Positive conductor (+)
Nickel-Chromium (NiCr, ~90 % Ni / 10 % Cr, non-magnetic)
Negative conductor (−)
Nickel-Aluminium (NiAl, ~95 % Ni / 2 % Mn / 2 % Al, magnetic)
Tolerance Class 1 (IEC 60584-3)
±1.5 °C (±25 µV) over −25 °C to +200 °C junction range
Tolerance Class 2 (IEC 60584-3)
±2.5 °C (±40 µV) over −25 °C to +200 °C junction range
Nominal Seebeck coefficient
≈ 40.6 µV/°C (0 to +100 °C) · loop R ≈ 1.00 Ω/m at 1.0 mm²

Thermal

Thermoelectric calibration range
−25 °C to +200 °C (true extension grade KX)
Insulation rating (by jacket type)
−25…+105 °C (HR-PVC) · −40…+90 °C (XLPE/LSZH) · −60…+200 °C (FEP)

Mechanical

Conductor stranding
0.5 mm² (7/0.30) · 1.0 mm² (7/0.43) · 1.5 mm² (7/0.53) or solid
Min. bending radius
7.5 × OD (unarmoured) · 10 × OD (SWA armoured)

Resistance

Flame retardance
IEC 60332-1-2 & IEC 60332-3-24 Cat C
Chemical & oil resistance
EN 50290-2-22 oil-resistant PVC or chemically inert FEP

Reference standards

Thermocouple cable standard
IEC 60584-3, ANSI/ISA MC96.1 (ASTM E230) & DIN 43722
Cable construction standard
BS EN 50288-7 / BS 5308

Identification

IEC 60584-3 colour code
(+) Green · (−) White · Outer sheath: Green (or Blue Ex-i)
ANSI MC96.1 colour code
(+) Yellow · (−) Red · Outer sheath: Yellow
Customs tariff (HS)
8544.49

Sizes

16 standard KX / Type K extension thermocouple cable sizes

Available in single-pair and multi-pair (1P to 24P) PVC, XLPE/LSZH, FEP (+200 °C) and SWA armoured executions.

Dimensions, construction & weights
Order designationConfigurationInsulation / SheathTemp. rangeOuter Ø ≈
mm		Weight ≈
kg/km		Min. bend R
fixed mm		Enquiry
KX Heat-Resistant PVC / PVC Screened (−25…+105 °C)
KX-PVC-OS 1×2×0.51×2×0.5 mm² (7/0.30)PVC / PVC (OS)−25…+105 °C5.64442
KX-PVC-PiMF 2×2×0.52×2×0.5 mm² (7/0.30)PVC / PVC (PiMF+OS)−25…+105 °C8.68464
KX-PVC-PiMF 4×2×0.54×2×0.5 mm² (7/0.30)PVC / PVC (PiMF+OS)−25…+105 °C10.814281
KX-PVC-PiMF 8×2×0.58×2×0.5 mm² (7/0.30)PVC / PVC (PiMF+OS)−25…+105 °C14.1246106
KX-PVC-PiMF 12×2×0.512×2×0.5 mm² (7/0.30)PVC / PVC (PiMF+OS)−25…+105 °C16.9348127
KX-PVC-OS 1×2×1.01×2×1.0 mm² (7/0.43)PVC / PVC (OS)−25…+105 °C6.76850
KX-PVC-PiMF 4×2×1.04×2×1.0 mm² (7/0.43)PVC / PVC (PiMF+OS)−25…+105 °C12.821296
KX-PVC-OS 1×2×1.51×2×1.5 mm² (7/0.53)PVC / PVC (OS)−25…+105 °C7.59256
KX-PVC-PiMF 4×2×1.54×2×1.5 mm² (7/0.53)PVC / PVC (PiMF+OS)−25…+105 °C14.3286107
KX-PVC-PiMF 12×2×1.512×2×1.5 mm² (7/0.53)PVC / PVC (PiMF+OS)−25…+105 °C22.6710170
KX High-Temperature FEP / FEP Screened (−60…+200 °C)
KX-FEP-OS 1×2×0.51×2×0.5 mm² (7/0.30)FEP / FEP (OS)−60…+200 °C4.63834
KX-FEP-PiMF 4×2×0.54×2×0.5 mm² (7/0.30)FEP / FEP (PiMF+OS)−60…+200 °C9.212869
KX-FEP-OS 1×2×1.01×2×1.0 mm² (7/0.43)FEP / FEP (OS)−60…+200 °C5.65842
KX XLPE / LSZH / SWA Armoured Direct-Burial (−40…+90 °C)
KX-XLPE-SWA 1×2×1.51×2×1.5 mm² (7/0.53)XLPE / SWA / LSZH−40…+90 °C12.1298121
KX-XLPE-SWA 4×2×1.54×2×1.5 mm² (7/0.53)XLPE / SWA / LSZH−40…+90 °C19.8745198
KX-XLPE-SWA 8×2×1.58×2×1.5 mm² (7/0.53)XLPE / SWA / LSZH−40…+90 °C25.01,180250
  • Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
  • Specify 'IEC' (Green/White) or 'ANSI' (Yellow/Red) colour code and Class 1 or Class 2 EMF tolerance when ordering.

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
Thermoelectric EMF calibration test (IEC 60584-3)EMF deviation within Class 1 (±1.5 °C / ±25 µV) at +100 °C / +200 °C reference pointsEvery alloy melt & production batch
1500 V / 2000 V AC dielectric test & continuity check1 min AC withstand test without breakdown; polarity verifiedEvery manufactured drum

Inspection certificate

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

Product approvals

IEC 60584-3 Class 1 & Class 2 CertifiedANSI/ISA MC96.1 & ASTM E230 CompliantCE, RoHS 2 (2011/65/EU) & REACH

Company certificates

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

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX KX TYPE K EXTENSION <size> IEC 60584-3 CLASS 1 CE
Delivery form
Non-returnable fumigated wooden drums
Standard lengths
500 m · 1000 m standard drums (cut lengths on request)
MOQ
500 m (stock sizes) · 1000 m (custom)
Lead time
2–4 weeks ex-works
Incoterms
EXW, FCA, FOB, CIF, DAP

Technical documents

Downloads

PDFKX / Type K extension Thermocouple Cable – technical datasheet16 sizes · construction, technical data, approvalsXLSXKX / Type K extension spec data (Excel)All 16 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 is the difference between KX (extension cable) and KCA / KCB (compensating cables)?
KX is a true extension cable whose conductors are made from the exact same Nickel-Chromium (+ NiCr) and Nickel-Aluminium (− NiAl) alloys as the Type K thermocouple itself, achieving Class 1 (±1.5 °C) accuracy from −25 °C to +200 °C. KCA (Fe/CuNi, 0 to +200 °C) and KCB (Cu/CuNi, 0 to +100 °C) use lower-cost substitute alloys and are only rated to Class 2 (±2.5 °C).
How can a field technician quickly distinguish the positive (+) and negative (−) KX conductors if the insulation is stripped back?
In addition to the colour code (IEC: + Green / − White; ANSI: + Yellow / − Red), the negative NiAl conductor is noticeably magnetic and will attract a small pocket magnet, whereas the positive NiCr conductor is non-magnetic.
Why must Type K thermocouples never be extended using standard copper instrumentation cable (RE-2Y(st)Y)?
Connecting copper wires to a NiCr/NiAl thermocouple terminal head creates a parasitic cold junction directly inside the hot furnace head box. Any temperature difference between the furnace head box and the control room cold-junction sensor will appear directly as a 1:1 measurement error (often 30 °C to 150 °C off).
How should the screen and drain wire of KX / Type K extension be earthed in instrumentation and Ex-i loops?
To prevent circulating 50/60 Hz ground-loop currents from coupling into millivolt or 4–20 mA signals, the Al/PET screen and tinned copper drain wire of KX / Type K extension should be bonded to the clean instrumentation earth bar at one end only (typically in the control/marshalling cabinet) and insulated against chassis contact at the field transmitter or junction box, in accordance with IEC 60079-14 and EN 50288-7.

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KX / Type K extension Thermocouple Cable

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Reel & motion:
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