Extension and Compensating Cables for Thermocouples

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Extension and Compensating Cables for Thermocouples

Extension and Compensating Cables for Thermocouples

Extension and compensating cables for thermocouples are special-purpose lead wires for connecting thermocouples (thermometers) with measuring instruments.
Different types of cables are used for different types of thermocouples; their components, identification (color coding), compensation temperatures (connecting-point temperatures) at the point of contact with thermocouples, wire specification tolerances, and other requirements are defined by JIS.

In response to your requests, Ninomiya Electric Wire Co., Ltd., produces and provides a variety of precise, high-quality extension and compensating cables for thermocouples. In addition to the general characteristics of our products, our special cables, building on the features of our other products, can be used under severe conditions such as high temperatures and are well accepted in many areas. We also produce non-cataloged special products tailored to your requests.

Extension and Compensating Cables for Thermocouples

Types/Identifications/Conductor Materials of Extension and Compensating Cables for Thermocouples

Ninomiya's extension and compensating cables for thermocouples comply with JIS C1610-2012, JIS C1610-1995 and ASTM E 230 (formerly ANSI MC 96.1).

Thermocouple Types for Combined Use	Conductor Material		JIS C1610							ASTM E 230
	+	-	Type and Color of Extension and Compensating Cables for Thermocouples				Compensating contact temperature	Tolerance		Type and Color of Extension and Compensating Cables for Thermocouples		Compensating contact temperature	Tolerance
	+	-	Type	2012 (1995 classification 1)	Type	Former JIS Color (1995 classification 2)	℃	Class 1 (μV)	Class 2 (μV)	Type	Color Classification	℃	SPECIAL (℃)	STANDARD (℃)
B	Copper	Copper	BC		BX		0~+100	No regulations		BX		0~+200	-	±4.2
R	Copper	Copper nickel alloy	RCA		RX		0~+100	-	±30	RX		0~+200	-	±5.0
R	Copper	Copper nickel alloy	RCB		RX		0~+200	-	±60	RX		0~+200	-	±5.0
S	Copper	Copper nickel alloy	SCA		SX		0~+100	-	±30	SX		0~+200	-	±5.0
S	Copper	Copper nickel alloy	SCB		SX		0~+200	-	±60	SX		0~+200	-	±5.0
N	Nickel-chrome alloy	Nickel-silicon alloy	NX		-		-25~+200	±60	±100	NX		0~+200	±1.1	±2.2
K	Nickel-chrome alloy	Nickel alloy	KX		KX		-25~+200	±60	±100	KX		0~+200	±1.1	±2.2
	Iron	Copper nickel alloy	KCA		WX (KCB)		0~+150	-	±100
	Copper	Copper nickel alloy	KCB		VX (KCC)		0~+100	-	±100
E	Copper nickel-chrome alloy	Copper nickel alloy	EX		EX		-25~+200	±120	±200	EX		0~+200	±1.0	±1.7
J	Iron	Copper nickel alloy	JX		JX		-25~+200	±85	±140	JX		0~+200	±1.1	±2.2
T	Copper	Copper nickel alloy	TX		TX		-25~+100	±30	±60	TX		-60~+100	±0.5	±1.0

Selection of Extension and Compensating Cables for Thermocouples Combined with K Thermocouple
There are the following three types: KX (high precision); KCA [WX] (for heat resistance); and KCB [VX] (for general use)
When selecting, consider the ambient temperature to be used and the required accuracy.

How to Place an Order and Apply Symbols

(1) Conductor Configuration (see each product page): Select the conductor size.
(2) The Number of Pairs: One pair (1P) refers to 2 core wires. For a extension and compensating cables for thermocouples, a plus and a minus are usually used as a pair.
(3) Types and Tolerance Classes of Extension and Compensating Cables for Thermocouples (see Table 1 below): The extension and compensating cables for thermocouples must be the same as the thermocouple used in combination.
(4) Application Classification: Select the insulator and sheath material to be used for the conductor.
(5) Identification (see Table 2 below2): Identification should be done according to the insulator and the sheath color.
(6) Shielding and Protection Braid: Specify the shielding and protection braid as needed.
(7)(8) Insulator and Sheath Material: As a standard, the same material is used for both insulator and sheath. However, different materials can be used in combination, depending on the intended use. Select the most suitable coating material according to the service conditions and applications.
(9) Shape: F: Flat
R: Round (Interposed)
T: Round (not interposed)
P: Flat with a protection braid with no sheath
FF: Flat - spectacle shape
r: Flat - tenioid

*Basically, for the flat type, (7), (8) and (9) after = will be omitted.

Table 1 Types and Tolerance Classes of Extension and Compensating Cables for Thermocouples (type to be inserted in □)

Item	Symbol		Tolerance class
Item	JIS	ASTM	JIS	ASTM
Extension and Compensating Cables for Thermocouples Type Tolerance class	BC	BX-ASt	Not specified	Standard
	RCA-2	RX-ASt	Class 2	Standard
	RCB-2	RX-ASt	Class 2	Standard
	SCA-2	SX-ASt	Class 2	Standard
	SCB-2	SX-ASt	Class 2	Standard
	NX-1	NX-ASp	Class 1	Special
	NX-2	NX-ASt	Class 2	Standard
	KX-1	KX-ASp	Class 1	Special
	KX-2	KX-ASt	Class 2	Standard
	KCA-2(WX)	-	Class 2	-
	KCB-2(VX)	-	Class 2	-
	EX-1	EX-ASp	Class 1	Special
	EX-2	EX-ASt	Class 2	Standard
	JX-1	JX-ASp	Class 1	Special
	JX-2	JX-ASt	Class 2	Standard
	TX-1	TX-ASp	Class 1	Special
	TX-2	TX-ASt	Class 2	Standard

Table 2 Identification (symbol to be inserted in ◇)

Item	Symbol	Tolerance class
Identification	J1	Color code for JIS classification 1
	J2	Color code for JIS classification 2
	AS	Color code for ASTM (formerly ANSI MC96.1)

List of reciprocating conductor resistances of extension

List of reciprocating conductor resistances of extension and compensating cables for thermocouples on a size-by-size basis (reference values at 20°C/standard)

JIS C 1610-2012		BC	RCA/RCB	SCA/SCB	NX	KX	KCA	KCB	EX	JX	TX
JIS C 1610-1981		BX	RX	SX	-	KX	WX	VX	EX	JX	TX
Nominal cross-sectional area mm²	Composition Pcs/mm	Reciprocating conductor resistance Ω/m
0.3	12/0.18	0.12	0.28	0.28	5.0	3.6	2.5	2.1	4.5	2.5	2.1
0.5	7/0.3	0.08	0.17	0.17	3.0	2.2	1.4	1.2	2.7	1.4	1.2
0.5	20/0.18	0.08	0.17	0.17	3.0	2.2	1.4	1.2	2.7	1.4	1.2
0.75	30/0.18	0.05	0.11	0.11	2.0	1.5	0.95	0.75	1.8	0.95	0.75
1.25	7/0.45	0.04	0.080	0.080	1.3	1.0	0.65	0.55	1.3	0.65	0.55
1.25	50/0.18	0.04	0.080	0.080	1.3	1.0	0.65	0.55	1.3	0.65	0.55
1.3	4/0.65	0.03	0.070	0.070	1.1	0.90	0.55	0.45	1.1	0.55	0.45
2.3	7/0.65	0.02	0.040	0.040	0.65	0.50	0.30	0.25	0.60	0.30	0.25

List of thermal electromotive forces of extension

Type	Electromotive force (µV)			Tolerance
Type	0℃	100℃	200℃	(μV)	(℃)
RCA(RX-G)	0	647	-	±30	±4.0
RCB(RX-H)	0	647	1469	±60	±7.0
SCA	0	646	-	±30	±4.0
SCB	0	646	1441	±60	±7.0
NX Class 1	0	2774	5913	±60	±2.0
NX Class 2	0	2774	5913	±100	±3.4
KX Class 1	0	4096	8138	±60	±1.5
KX Class 2	0	4096	8138	±100	±2.5
KCA(WX)	0	4096	-	±100	±2.5
KCB(VX)	0	4096	-	±100	±2.5
EX Class 1	0	6319	13421	±120	±1.5
EX Class 2	0	6319	13421	±200	±2.5
JX Class 1	0	5269	10779	±85	±1.5
JX Class 2	0	5269	10779	±140	±2.5
TX Class 1	0	4279	-	±30	±0.5
TX Class 2	0	4279	-	±60	±1.0

TEWExtension and Compensating Cables for Thermocouples

Extension and Compensating Cables for Thermocouples

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Extension and Compensating Cables for Thermocouples

Types/Identifications/Conductor Materials of Extension and Compensating Cables for Thermocouples

How to Place an Order and Apply Symbols

How to Place an Order and Apply Symbols

List of reciprocating conductor resistances of extension

List of thermal electromotive forces of extension