Thermocouples Extension and Compensating Alloys

Thermocouple Extension and Compensation Alloy Wire is to extend the hot electrode (cold end of the thermocouple), and connect with the display instrument to form a temperature measuring system. The operating temperature is -25-200℃.

HB SPECIAL ALLOY mainly produce KX, NX, EX, JX, TX, SC/RC, KCA, KCB and WRENC Extension and Compensation Alloy Wire for Thermocouples. They are used in all kinds of temperature measuring devices and cables, and have been widely used in nuclear power, petroleum, chemical industry, metallurgy, electric power and other fields.

Our Thermocouple Extension and Compensation Alloy Wire is produced according to GB/T 4990-2010 ‘Alloy Wires of Extension and Compensating Cables for Thermocouples’ and IEC 60584-3-2007 ‘Standard | Thermocouples – Part 3’.

EMF of Compensating Wire and the Tolerance

Thermocouple Index No.	Extension and Compensating Wire Type	Usage Classification	Measuring Junction Temperature, ℃	Standard EMF Value, μV	Precision Grade		General Level
Thermocouple Index No.	Extension and Compensating Wire Type	Usage Classification	Measuring Junction Temperature, ℃	Standard EMF Value, μV	Tolerance, μV	Thermal EMF Range, μV	Tolerance, μV	Thermal EMF Range, μV
S or R	SC or RC	G	100	646	±30	616-676	±60	586-706
		H	100	646	–	–	±60	586-706
		H	200	11441	–	–	±60	1.381-1501
K	KX, KCA or KCB	G	-25	-968	±40	-924–1012	±80	-1936
		G	100	4096	±40	4052-4140	±80	4008-4184
		H	-25	-968	±40	-924–1012	±88	-1936
			100	4096		4052-4140		4008-4184
			200	8138		8094-8182		8050-8226
N	NX or NC	G	-25	-646	±43	-1292	±86	-1292
		G	100	2774	±43	2731-2817	±86	2688-2860
		H	-25	-646	±43	-1293	±86	-1292
			100	2774		2731-2817		2688-2860
			200	59123		5870-5956		5827-5999
E	EX	G	-25	-1432	±81	-2864	±138	-2864
		G	100	6319	±81	6238- 6400	±138	6181-6 457
		H	-25	-1432	±81	-2864	±138	-2864
			100	6319		6238-6400		6181-6457
			200	13421		13340-13502		13283-13559
J	JX	G	-25	-1239	±62	-2478	±123	-2478
		G	100	5269	±62	5207-5331	±123	5146-5392
		H	-25	-1239	±62	-1478	±123	-2478
			100	5269	±62	5207-5331	±123	5146-5392
			200	10779	±62	10717-10841	±123	10656-10902±1℃ or ±1.5%t
T	TX	G	-25	-940	±30	-910 970	±60	-1850
		G	100	4279	±30	4249-4309	±60	4189-4339
		H	-25	-940	±48	-1880	±60	-1880
			100	4279		4231-4327		4189-4369
			200	9288		9240-		9198-9378

Compensation Wire Type	Reciprocating Resistance at ℃ Ω/m (less than)
Compensation Wire Type	0.2mm2	0.5mm2	1.0mm2	1.5mm2	2.5mm2
SC or RC	0.25	0.1	0.05	0.03	0.02
KCA	3.5	1.4	0.7	0.47	0.28
KCB	2.6	1.04	0.52	0.35	0.21
KX	5.5	2.2	1.1	0.73	0.44
EX	6.25	2.5	1.25	0.83	0.5
JX	3.25	1.3	0.65	0.43	0.26
TX	2.6	1.04	0.52	0.35	0.21
NC	3.75	1.5	0.75	0.5	0.3
NX	7.15	2.86	1.43	0.95	0.57