Thermocouple Cable

(This article is an introduction of Thermocouple extension cable including thermocouple wire cable materials, types, range, specification, color code,  etc.)

A thermocouple extension cable is a specialized type of wire used to extend the signal from a thermocouple probe to a measuring instrument.Here are some key points about it:

Definition and Purpose

• It is used when the thermocouple probe needs to be located at a distance from the measuring instrument,allowing the signal to be transmitted accurately over longer distances without significant loss of signal quality.

• The extension cable is identified by the letter"X"added to the thermocouple type(e.g.,KX for Type K thermocouple extension cable).

|K type | J type | T type |N type| R/S type | E type |B type |

Material and Construction

• It is made from the same materials as the main thermocouple leads.For example,Type K extension cables are made of Chromel(NiCr)and Alumel(NiAl),the same materials used in Type K thermocouples.

Conductor Alloy material

Type	Positive	Negative
J	Fe	Cu-Ni
K	Ni-Cr	Ni-Al
T	Cu	Cu-Ni
E	Ni-Cr	Cu-Ni
N	Ni-Cr-Si	Ni-Si-Mg
R/SX	Cu	Cu-Ni
U	Cu	Cu
B	Cu	Cu

• The conductors are typically insulated with materials like PVC,FEP Teflon,or fiberglass to protect against environmental factors and electrical interference.

Teflon insulated | Fiberglass insulated | PVC insulated|Silicone Insulated | Polymide insulated | High silica insulated |Mineral insulated |

Temperature Range and Standards

• The temperature range of thermocouple extension cables is generally lower than that of the thermocouple itself.For instance,the extension cable can pass a signal representing a higher temperature but should not be exposed to such high temperatures directly.

Model	Description	Temperature
GG	Fiberglass insulation + Fiberglass out sheath	400°C
GGB	Fiberglass insulation + Fiberglass out sheath+ SSB braid	400°C
GB	Fiberglass insulation + SSB braid	400°C
FF	Teflon FEP insulation with FEP out sheath	200°C
FTF	Teflon FEP + Copper tinned thread braid + FEP out sheath	200°C
FFB	Teflon FEP + FEP out sheath+ SSB braid	200°C
FB	FEP insulation+ SSB braid	200°C
PP	Teflon PFA insulation with PFA out sheath	260°C
PTP	Teflon PFA + Copper tinned thread braid + PFA out sheath	260°C
PPB	Teflon PFA + PFA out sheath+ SSB braid	260°C
PB	Teflon PFA insulation+ SSB braid	260°C
VV	PVC insulation + PVC out sheath	105°C
FV	Teflon FEP+ PVC out sheath	105°C
VVB	PVC insulation + PVC out sheath+ SSB braid	105°C
XX	Silicone rubber insulation + Silicone rubber out sheath	180°C
PX	Teflon PFA +Silicone rubber out sheath	180°C
KK	Kapton insulation + Kapton insulation	260°C
HH	High silica insulation + High silica out sheath	800°C/1100°C

• They follow specific standards such as ASTM/ANSI for color coding and DIN 43710 for manufacturing.
Color code: ANSI,IEC ,JIS color code standard

Applications

• These cables are widely used in various industrial applications,including metal processing,power generation,HVAC systems,food processing,pharmaceutical manufacturing,and scientific research.


Importance for Accurate Measurement

• Using the correct thermocouple extension cable ensures accurate temperature readings by maintaining the thermoelectric properties of the circuit.Using a different type of cable or ordinary electrical wire can introduce errors in the measured temperature.

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