ANSI Standard AWG 14 Type K Thermocouple Compensation Cable FEP Insulation

Huona  produces different types of compensated cable for thermocouple, such as KX type, NX, EX, JX, NC, TX, SC / RC, KCA, KCB. We also produce all cables with insulation such as PVC, PTFE, Silicone and fiberglass.
The compensated cable is mainly used in thermal measurement instrumentation. If the temperature changes, the cable responds with a small voltage that passes to the thermocouple it is connected to and we already have the measurement.

The thermocouple compensation cables can also be termed as instrumentation cables, since they are used for process temperature measurement. The construction is similar to pair instrumentation cable but the conductor material is different. Thermocouples are used in processes to sense temperature and is connected to the pyrometers for indication and control. The thermocouple and pyrometer are electrically conducted by thermocouple extension cables / thermocouple compensating cables. The conductors used for these thermocouple cables are required to have similar thermo-electric (emf) properties as that of the thermocouple used for sensing the temperature.
 
Our plant mainly manufacture type KX,NX,EX,JX,NC,TX,SC/RC,KCA,KCB  compensating wire for thermocouple, and they are used in temperature measurement instruments and cables. Our thermocouple compensating products are all made abiding by GB/T 4990-2010 "Alloy wires of extension and compensating cables for thermocouples" (Chinese National Standard), and also IEC584-3 "Thermocouple part 3-compensating wire" (International standard).
 
The representing of the comp. wire: thermocouple code+C/X , e.g. SC, KX
X:  Short for extension, means that the compensation wire"s alloy is as the same as the the alloy of the thermocouple
C:  Short for compensation, means that the compensation wire"s alloy has similar characters with the thermocouple"s alloy in a certain temperature range.

Type K Thermocouple Bare Wire

Type K (CHROMEL vs ALUMEL ) is used in oxidizing, inert or dry reducing atmospheres. Exposure to vacuum limited to short time periods. Must be protected from sulfurous and marginally oxidizing atmospheres. Reliable and accurate at high temperatures.

1. Chemical Composition

Material	Chemical composition (%)
	Ni	Cr	Si	Mn	Al
KP(Chromel)	90	10
KN(Alumel)	95		1-2	0.5-1.5	1-1.5

2. Physical properties and Mechnical properties

Material	Density(g/cm3)	Melting point(ºC)	Tensile Strength(Mpa)	Volume resistivity(μΩ.cm)	Elongation rate (%)
KP(Chromel)	8.5	1427	>490	70.6(20ºC)	>10
KN(Alumel)	8.6	1399	>390	29.4(20ºC)	>15

3. EMF Value range at different temperature

Material	EMF value Vs Pt(μV)
	100ºC	200ºC	300ºC	400ºC	500ºC	600ºC
KP(Chromel)	2816~2896	5938~6018	9298~9378	12729~12821	16156~16266	19532~19676
KN(Alumel)	1218~1262	2140~2180	2849~2893	3600~3644	4403~4463	5271~5331

 

EMF value Vs Pt(μV)
700ºC	800ºC	900ºC	1000ºC	1100ºC
22845~22999	26064~26246	29223~29411	32313~32525	35336~35548
6167~6247	7080~7160	7959~8059	8807~8907	9617~9737

 

Type K Extension Cable Chromel / Alumel Material FEP insulation

Specifications

1.Style:Extension Wire
2.Thermocouple copper wire
Thermocouple copper wire Classification
1. Thermocouple level (high temperature level). This type of thermocouple wire is mainly suitable for thermocouple type K, J, E, T, N and L and other high temperature detection instrument, temperature sensor, etc.
2. Compensating wire level (low temperature level). This type of thermocouple wire is mainly suitable for compensating cable and extension wire of various thermocouples of type S, R, B, K, E, J, T, N and L, heating cable, control cable and so on.

Thermocouple variety and index

Thermocouple Variety and Index
Variety	Type	Measurement Range(°C)
NiCr-NiSi	K	-200-1300
NiCr-CuNi	E	-200-900
Fe-CuNi	J	-40-750
Cu-CuNi	T	-200-350
NiCrSi-NiSi	N	-200-1300
NiCr-AuFe0.07	NiCr-AuFe0.07	-270-0

3 . Dimensions and Tolerance of Fiberglass Insulated Thermocouple Wire

 Dimensions / Tolerance mm ) : 4.0+-0.25

Color code & initial calibration tolerances for thermocouple wire:

Thermocouple Type		ANSI Color Code		Initial Calibration Tolerances
Wire Alloys	Calibration	+/- Conductor	Jacket	Temperature Range	Standard Limits	Special Limits
CHROMEL(+) vs. ALUMEL(-)	K	Yellow/Red	Brown	-200°C to -110°C -110°C to 0°C 0°C to +285°C 285°C to +1250°C	± 2% ±2.2°C ±2.2°C ± .75%	±1.1°C ± .4%

Color Code & Initial Calibration Tolerance for Extension Wire:

Extension type		ANSI Color Code		Initial Calibration Tolerances
Wire Alloys	Calibration	+/- Conductor	Jacket	Temperature Range	Standard Limits	Special Limits
Iron (+) vs. Constantan(-)	JX	White/Red	Black	0°C to +200°C	±2.2°C	±1.1°C
CHROMEL (+) vs. ALUMEL (-)	KX	Yellow/Red	Yellow	0°C to +200°C	±2.2°C	±1.1°C
Copper(+) vs. Constantan(-)	TX	Blue/Red	Blue	-60°C to +100°C	±1.1°C	± .5°C
CHROMEL(+) vs. Constantan(-)	EX	Purple/Red	Purple	0°C to +200°C	±1.7°C	±1.1°C

PVC-PVC Physical Properties:

Characteristics	Insulation	Jacket
Abrasion Resistance	Good	Good
Cut Through Resistance	Good	Good
Moisture Resistance	Excellent	Excellent
Solder Iron Resistance	Poor	Poor
Service Temperature	105ºC continuous 150ºC single	105ºC continuous 150ºC single
Flame Test	Self-extinguishing	Self-extinguishing