Ceramic beaded bare wire thermocouple

Thermocouple consists of two wires, each made of different metal, welded together at one end. When the

welded point(measuring junction) is heated, a thermoelectromotive force is produced that is proportional

of the temperature difference between the welded point and the other end (reference junction).

Therefore, by messuring this thermoelectromotive force either with the reference junction temperature kept

constant or by using an automatic compensation curciut, the measuring junction temperature can be measured.

The thermoelectromotive force of a thermocouple is independent of the diameter or length of the wire used and

depends only on the type of wire used.

The thermocouples in this series require additional protection and are normally used as replacement elements

in protective tube and head assemblies, and are also compatible for use in sets from other manufacturers.

The thermocouple wires with smaller gauges provide faster response time and lower life and larger gauges provide

longer life, however, slower response time.

Drawing Type of Thermocouple Core
Material Type	Leg	core material	Leg dia		JIS C 1602		ANSI
Material Type	Leg	core material	JIS	ANSI	Max.operating temp . In normal application(℃)	Max.operating temp . In overheated application(℃)	Max.operaring temp.(℃)
B	+	Platinum 70% + rhodium 30%	0.5	0.5	1500	1700	1700
B	-	Platinum 94% + rhodium 6%	0.5	0.5	1500	1700	1700
R	+	Platinum 87% + rhodium 13%	0.5	0.5	1400	1600	1480
R	-	high purity platinum	0.5	0.5
S	+	Platinum90%+ rhodium 10%	0.5	0.5
S	-	high purity platinum	0.5	0.5
K	+	Nickel 90% + chromiun 10% Nickel 95% + Manganese 2% +Aluminum 2%	3.2	3.2	1000	1200	1260
			2.3	1.6	900	1100	1090
			1.6	0.8	850	1050	980
			1	0.5	750	950	870
			0.65	0.32	650	850	870
E	+ -	Nickel 90% +chromiun 10% Copper 55%+nickel 45 %	3.2	3.2	700	800	870
			2.3	1.6	600	750	650
			1.6	0.8	550	650	540
			1	0.5	500	550	430
			0.65	0.32	450	550	430
J	+ -	high purity iron Copper 55%+nickel 45 %	3.2	3.2	600	750	760
			2.3	1.6	550	750	590
			1.6	0.8	500	650	480
			1	0.5	450	650	370
			0.65	0.32	400	500	370
T	+ -	high purity copper Copper 55%+nickel 45 %	1.6	1.6	300	350	370
			1	0.8	250	300	260
			0.65	0.5	200	250	200
			0.32	0.32	200	250	200

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