Frequently Bought Together

Non-Insulated Single Conductor Thermocouple Wire

Non-Insulated Thermocouple wire is available in all ASTM thermocouple types, including R, S, B and C type wire from stock. Standard and Special accuracies available as are calibrations upon request.

Cut Sheet
Technical Information
White Papers

Cut Sheet
Technical Information
White Papers

Non-Insulated Single Conductor Thermocouple Type
Temperature Ranges
Sheath Material
Sheath Diameter Limits
Base Metal TC Wire
Comparison of Wire Gauges
High Temperature Thermocouple Wire Information
Accuracy of JMS Thermocouple Wire
Thermocouple Type Information
Thermocouple Extension Grade Wire General Information
Thermocouple Grade Wire General Information

Thermocouple Type	Material	Magnetic	ASTM Color Coding	IEC Color Coding
J	Iron Constantan	Yes No	White Red	White Black
T	Copper Constantan	No No	Blue Red	White Brown
K	Chromel Alumel	No No	Yellow Red	White Green
E	Chromel/Constantan	No No	Purple Red	White Violet
P	Platinel	N/A	N/A	N/A
S	Platinum 10% Rhodium Pure Platinum	No No	Black Red	White Orange
R	Platinum 13% Rhodium Pure Platinum	No No	Black Red	white Orange
B	Platinum 30% Rhodium Platinum 6% Rhodium	No No	Grey Red	White Grey
N	Nicrosil/Nisil	No Slightly	Orange Red	White Pink
C	Tungsten 5% Rhenium/ Tungsten 26% Rhenium	No No	White Red	N/A

ANSI Thermocouple Type	Temp Range (°C)	Temp Range (°F)	Standard Limits of Error (°C)^*	Special Limits of Error (°C)
J	0 to 760	32 to 1400	±2.2 or ±0.75%	±2.2 or ±0.75%
T	0 to 370	32 to 700	±1 or ±0.75%	±0.5 or ±0.4%
K	0 to 1260	32 to 2300	±2.2 or ±0.75%	±1.1 or ±0.4%
E	0 to 870	32 to 1600	±1.7 or ±0.5%	±1 or ±0.4%
S	0 to 1480	32 to 2700	±1.5 or ±0.25%	±0.6 or ±0.1%
R	0 to 1480	32 to 2700	±1.5 or ±0.25%	±0.6 or ±0.1%
N	0 to 1246	32 to 2300	±2.2 or ±0.75%	±1.1 or ±0.4%
B	870 to 1700	1600 to 3100	±0.5%	±0.25%
T^A	-200 to 0	-328 to 32	±1 or ±1.5%	^B
E^A	-200 to 0	-328 t0 32	±1.7 or ±1%	^B
K^A	-200 to 0	-328 tp 32	±2.2 or ±2%	^B

^A: Thermocouple and thermocouple materials are normally supplied to meet the tolerances specified in the table of temperatures above 0°C. The same materials, however, may not fall within the tolerances given for temperatures below 0°C in the normal section in the table. If materials are required to meet the tolerances stated for temperatures below 0°C the purchase order must state so. Selection of materials will usually be required.

^B: Special tolerances for temperatures below 0°C are difficult to justify due to limited available information.

*: Standard and special limits of error in °F are 1.8 times larger thant the °C tolerance at the equivalent °C temperature.

Material Symbol	Sheath Material	Melting Point(°F)	Max Temp; In Air(°F)	Atmosphere^*
H	304 SS	2550	1650	ORNV
J	310 SS	2550	2100	ORNV
L	316L SS	2550	1650	ORNV
O	446 SS	2700	2100	ORNV
M	Inconel 600	2500	2100	ONV
P	Inconel 702	2620	1500	ONV
Q	Platinum	3216	3000	ON
R	Molybdenum	4750	1000	VNR
T	Titanium	3300	600	V
V	STABALOY	2552	2220	ORNV

^*KEY

O=Oxidizing, R=Reducing, N=Neutral, V=Vacuum

Suggested Upper Limit for Outside Diameter (Single Element) °C (°F)
Sheath		Thermocouple Type
In	mm	T	J	E	K	N
1/25"	1.0	260° (500°)	260° (500°)	300° (570°)	700° (1290°)	2700° (1290°)
1/16"	1.6	260° (500°)	440° (825°)	510° (950°)	920° (1690°)	920° (1690°)
1/8"	3.2	315° (600°)	520° (970°)	650° (1200°)	1070° (1950°)	1070° (1950°)
3/16"	4.8	370° (700°)	620° (1150°)	730° (1350°)	1150° (2100°)	1150° (2100°)
1/4"	6.3	370° (700°)	720° (1330°)	820° (1510°)	1150° (2100°)	1150° (2100°)
3/8"	9.5	370° (700°)	720° (1330°)	820° (1510°)	1150° (2100°)	1150° (2100°)

BASE METAL THERMOCOUPLE WIRE FT. / LB

ANSI CODE	WIRE TYPE	ELEMENT POLARITY	AWG	WIRE FT. / LB
JP	Iron	JP Iron Positive (+) 8	8 14 20 24 28 30	22.8 91.2 365.0 925.0 2353.0 3767.0
JN	Constantan	Negative (-	8 14 20 24 28 30	20.2 80.9 324.0 821.0 2089.0 3316.0
KP	Chrome	Positive (+)	8 14 20 24 28 30	21 83 331 838 2089 3316
KN	Alumel	Negative (-)	8 14 20 24 28 30	21 83 331 838 2130 3370
EP
EN	Chromel	Positive (+)	20 24 30	328 833 3364
TP	Copper	Positive (+)	20 24 30	324 820 3294
TN	Constantan	Negative (-)	20 24 30	324 821 3316

COMPARISON OF WIRE GAUGES

Standard Wire Gauges in Approximate Decimals of an Inch and mm.

American or Brown and Sharp Wire Gauge	Diameter Inches	Diameter Millimeters	British Standard or Imperial	US Standard
1	0.2893	7.348	.300	.281
2	0.2576	6.544	.276	.266
3	0.2294	5.827	.252	.250
4	0.2043	5.189	.232	.234
5	0.1819	4.621	.212	.219
6	0.1620	4.115	.192	.203
7	0.1443	3.665	.176	.188
8	0.1285	3.264	.160	.172
9	0.1144	2.906	.144	.156
10	0.1019	2.588	.128	.141
11	0.0907	2.304	.116	.125
12	0.0808	2.053	.104	.109
13	0.0720	1.829	.092	.0938
14	0.0641	1.628	.080	.0781
15	0.0571	1.450	.072	.0703
16	0.0508	1.291	.064	.0625
17	0.0453	1.150	.056	.0563
18	0.0403	1.024	.048	.0500
19	0.0359	0.9116	.040	.0438
20	0.0320	0.8118	.036	.0375
21	0.0285	0.7230	.032	.0344
22	0.0253	0.6438	.028	.031
23	0.0226	0.5733	.024	.0281
24	0.0201	0.5106	.022	.0250
25	0.0179	0.4547	.020	.0219
26	0.0159	0.4049	.018	.0188
27	0.0142	0.3606	.0164	.0172
28	0.0126	0.3211	.0148	.0156
29	0.0113	0.2859	.0136	.0141
30	0.0100	0.2546	.0124	.0125
31	0.0089	0.2268	.0116	.0109
32	0.0080	0.2019	.0108	.0102
33	0.00708	0.178	.010	.0094
34	0.00630	0.152	.0092	.0086
35	0.00561	0.138	.0084	.0078
36	0.00500	0.127	.0076	.0066
37	0.00445	0.1131	.0068	.0070
38	0.00397	0.1007	.006	.0063
39	0.00353	0.08969	.0052	--
40	0.00314	0.07987	.0048	--

HIGH TEMPERATURE THERMOCOUPLE WIRE

ANSI CODE	CODE TYPE	ELEMENT POLARITY	AWG	WIRE IN / T. OZ
SP	Pt-10% Rh	Positive (+)	16 20 24 26 28	46.4 118.0 302.2 480.0 715.2
SN
RP	Pt	Negative (-)	16 20 24 26 28	43.3 110.0 281.6 432.0 666.6
RN	Pt	Negative (-)	16 20 24 26 28	43.3 110.0 281.6 432.0 666.6
BP	Pt-30% Rh	Positive (+)	16 20 24 28	52.7 134.0 343.1 812.3
BN	Pt-6% Rh	Negative (-)	16 20 24 28	45.2 114.8 394.0 695.8
CP	Tungsten 5% Rhenium	Positive (+)	24	308.7
CN	Tungsten 26% Rhenium	Negative (-)	<24/td>	304.3

Pt = Platinum
Rh = Rhodium

ACCURACY OF JMS THERMOCOUPLE WIRE

JMS insulated and bare thermocouple wire is matched to meet standard or special limits of error for temperatures above 32°F (0°C), as given in ANSI MC 96.1 and shown in tables below

LIMITS OF ERROR FOR THERMOCOUPLE WIRE

THERMOCOUPLE TYPE		°F
WIRE ALLOY	ANSI TYPE SYMBOL	TEMPERATURE RANGE °F	STANDARD LIMITS	ORDER CODE	SPECIAL LIMITS	ORDER CODE
Iron (+) vs. Constantan (-)	J	+32° to +545° +545° to +1400°	±4° ±.75%	J	±2° ±.4%	JJ
Chromel™ (+) vs. Alumel ™ (-)	K	330° to -165° -165° to +32° +32° to +545° +545° to +2300°	±2% ±4° ±4° ±.75%	K	±2° ±.4%	KK
Copper (+) vs. Constantan™ (-	T	-330° to -85° -85° to +270° +270° to +660°	±1.5% ±1.8° ±.75%	T	±.8% ±.9° ±.4%	TT
Chromel™ (+) vs. Constantan™ (-)	E	-330° to -270° -270° to +480° +480° to +640° +640° to +1600°	±1% ±3° ±3° ±5%	E	±1.8° ±1.8° ±.4% ±.4%	EE
Nicrosil™ (+) vs. Nisil™ (-)	N	+32° to +545° +545° to +2300°	±4° ±.75%	N	±2° ±.4%	NN

THERMOCOUPLE TYPE		°C
WIRE ALLOY	ANSI TYPE SYMBOL	TEMPERATURE RANGE °C	STANDARD LIMITS	ORDER CODE	SPECIAL LIMITS	ORDER CODE
Iron (+) vs. Constantan (-)	J	0° to +285° +285° to +750	±2.2° ±.75%	J	±1.1° ±.4%	JJ
Chromel™ (+) vs. Alumel ™ (-)	K	-200° to -110° -110° to 0° 0° to +285° +285° to +1250	±2% ±2.2° ±2.2° ±.75%	K	±1.1° ±.4%	KK
Copper (+) vs. Constantan™ (-)	T	-200° to -65° -65° to +130° +130° to +350°	±1.5% ±1° ±.75%	T	±.8% ±.5° ±.4%	TT
Chromel™ (+) vs. Constantan™ (-)	E	-200° to -170° -170° to +250° +250° to +340° +340° to +900°	±1% ±1.7° ±1.7° ±5%	E	±1° ±1° ±.4% ±.4%	EE
Nicrosil™ (+) vs. Nisil™ (-)	N	0° to +285° +285° to +1250°	±2.2° ±.75%	N	±1.1° ±.4%	NN

THERMOCOUPLE TYPE INFORMATION

JMS offers thermocouples and wire in the following types. Listed below are suggested criteria to consider in selecting the desired type for your application. Contact JMS Southeast if additional information is required.

(J)–Iron vs Constantan (Most Common)
May be used in vacuum, oxidizing, reducing, and inert atmospheres. Heavier gauge wire is recommended for long term life above 1000°F since the iron element oxidizes rapidly at these temperatures.

(T)–Copper vs Constantan (Most Common Cold)
May be used in vacuum, oxidizing, reducing, and inert atmospheres. It is resistant to corrosion in most atmospheres. High stability at sub-zero temperatures and its limits of error are guaranteed at cryogenic temperatures.

(K)–Chromel vs Alumel (Most Common Real Hot)
Recommended for continuous use in oxidizing or inert atmospheres up to 2300°F (1260°C), especially above 1000°F. Cycling above and below 1800°F (1000°C), is not recommended due to EMF alteration from hysteresis effects. Should not be used in sulfurous or alternating reducing and oxidizing atmospheres unless protected with protection tubes. Fairly reliable and accurate at high temperatures.

(E)–Chromel vs Constantan
May be used in oxidizing or inert atmospheres, but not recommended for alternating oxidizing or inert atmospheres. Not subject to corrosion under most atmospheric conditions. Has the highest EMF produced per degree than any other standard thermocouple and must be protected from sulfurous atmospheres.

(S,R)–Platinum vs Platinum Rhodium (Most Common Real, Real Hot)
Recommended for use in oxidizing or inert atmospheres. Reducing atmospheres may cause excessive grain growth and drifts in calibration.

(N)–Nicrosil vs Nisil (New ... Better Than “K”)
May be used in oxidizing, dry reducing, or inert atmospheres. Must be protected in sulfurous atmospheres. Very reliable and accurate at high temperatures. Can replace Type K thermocouples in many application.

(C)–Tungsten 5% Rhenium vs Tungsten 26% Rhenium
Recommended for use in vacuum, high purity hydrogen, or pure inert atmospheres. May be used at very high temperatures (2316°C), however, is inherently brittle.

Thermocouple Type Information

ANSI T/C TYPE	NAMES	CONDUCTOR IDENTIFICATION	ASTM COLOR CODING	MAGNETIC	IEC COLOR CODING
J	Iron Constantan	+ -	white red	yes no	white black
T	Copper Constantan	+ -	blue red	no no	white brown
K	Chromel Alumel	+ -	yellow red	no yes	white green
E	Chromel Constantan	+ -	purple red	no no	white violet
P (Not ANSI)	Platinel	N/A	N/A	N/A	N/A
S	Platinum 10% Rhodium Pure platinum	+ -	black red	no no	white orange
R	Platinum 13% Rhodium Pure platinum	+ -	black red	no no	white orange
B	Platinum 30% Rhodium Platinum 6% Rhodium	+ -	grey red	no no	white grey
N	Nicrosil Nisil	+ -	orange red	no slightly	white pink
C (Not ANSI)	Tungsten 5% Rhenium Tungsten 26% Rhenium	+ -	white red	no no	N/A

ANSI T/C TYPE	TEMP. RANGE		LIMITS OF ERROR
	(°C)	(°F)	STANDARD		SPECIAL
	(°C)	(°F)	(°C)	(°F)	(°C)	(°F)
J	0 to 760	32 to 1400	±2.2 or ±0.75%	See Note	±1.1 or 0.4%	See Note
T	0 to 370	32 to 700	±1 or ±0.75%		±0.5 or 0.4%
K	0 to 1260	32 to 2300	±2.2 or ±0.75%		±1.1 or ±0.4%
E	0 to 870	32 to 1600	±1.7 or ±0.5%		±1 or ±0.4%
S	0 to 1480	32 to 2700	±1.5 or ±0.25%		±0.6 or ±0.1%
R	0 to 1480	32 to 2700	±1.5 or ±0.25%		±0.6 or ±0.1%
N	0 to 1246	32 to 2300	±2.2 or ±0.75%		±1.1 or ±0.4%
B	870 to 1700	1600 to 3100	±0.5%		±0.25%
TA	-200 to 0	-328 to 32	±1 or ±1.5%		B
EA	-200 to 0	-328 to 32	±1.7 or ±1%		B
KA	-200 to 0	-328 to 32	±2.2 or ±2		B

A Thermocouple and thermocouple materials are normally supplied to meet the tolerances specified in the table for temperatures above 0°C. The same materials, however, may not fall within the tolerances given for temperatures below 0°C in the section section of the table. If materials are required to meet the tolerances stated for temperatures below 0°C the purchase order must so state. Selection of materials usually will be required.

B Special tolerances for temperatures below 0°C are difficult to justify due to limited available information.

Note: The °F tolerance is 1.8 times larger than the °C tolerance at the equivalent °C temperature.

THERMOCOUPLE EXTENSION GRADE WIRE

Catalog Number	Guage Size	Conductors	*Ohms	Primary Insulation	Outer Jacket	Min.-Max. O.D.	Est. Shpg. Wt. per M
ANSI: TYPE, J - Iron / Constantan
PP161JX	16	Solid	.137	Polyvinyl Chloride	Polyvinyl Chloride	.111 x .188”	27 lbs.
PA161JX	16	Solid	.137	PVC/Alum. Mylar Shield (Twisted)	PVC	.222”	28 lbs.
PA201JX	20	Solid	.357	PVC/Alum. Mylar Shield (Twisted)	PVC	.184”	20 lbs.
PP201JX	20	Solid	.357	Polyvinyl Chloride	Polyvinyl Chloride	.095 x .158”	14 lbs.
PP202JX	20	Stranded	.317	Polyvinyl Chloride	Polyvinyl Chloride	.115 x .190”	14 lbs.
PX201JX	20	Solid	.357	(FEP) Extruded Teflon	Extruded Teflon	.072 x .124”	11 lbs.
ANSI: TYPE, K - Chromel / Alumel
PA161KX	16	Solid	.233	PVC/Alum. Mylar Shield (Twisted)	PVC	.222”	28 lbs.
PP161KX	16	Solid	.233	Polyvinyl Chloride	Polyvinyl Chloride	.116 x .188”	27 lbs.
PA201KX	20	Solid	.590	PVC/Alum. Mylar Shield (Twisted)	PVC	.184”	20 lbs.
PP201KX	20	Solid	.590	Polyvinyl Chloride	Polyvinyl Chloride	.195 x .158”	14 lbs.
PP202KX	20	Stranded	.538	Polyvinyl Chloride	Polyvinyl Chloride	.115 x .190”	14 lbs.
ANSI: TYPE, T - Copper / Constantan
PP141TX	14	Solid	.074	Polyvinyl Chloride	Polyvinyl Chloride	.130 x .226”	37 lbs.
PA161TX	16	Solid	.118	PVC/Alum. Mylar Shield (Twisted)	PVC	.222”	20 lbs.
PP161TX	16	Solid	.118	Polyvinyl Chloride	Polyvinyl Chloride	.111 x .188”	28 lbs.
PA201TX	20	Solid	.298	PVC/Alum. Mylar Shield (Twisted)	PVC	.184”	20 lbs.
PP201TX	20	Solid	.298	Polyvinyl Chloride	Polyvinyl Chloride	.095 x .158”	15 lbs.
ANSI: TYPE, E - Chromel / Constantan
PA161EX	16	Solid	.278	PVC/Alum. Mylar Shield (Twisted)	PVC	.222”	20 lbs.
PP201EX	20	Solid	.704	Polyvinyl Chloride	Polyvinyl Chloride	.095 x .158”	15 lbs.
ANSI: TYPE, S and R - Platinum / Rhodium
PP161SX	16	Solid	.016	Polyvinyl Chloride	Polyvinyl Chloride	.116 x .250”	27 lbs.
GG201SX	20	Solid	.040	Glass Braid	Glass Braid	.059 x .105”	8 lbs.
PP201SX	20	Solid	.040	Polyvinyl Chloride	Polyvinyl Chloride	.095 x .158	14 lbs.

*ohms per double foot at 20°C (68°F).

ANSI: TYPE, J - Iron / Constantan
Catalog Number	Guage Size	Conductors	*Ohms	Primary Insulation	Outer Jacket	Min-Max. O.D.	Est. Shpg. Wt. per M
GG210J	20	Solid	.357	Glass Braid	Glass Braid	.059 x .105”	8 lbs.
GG202J	20	Stranded	.317	Double Glass Braid	Glass Braid	.075 x .137”	9lbs.
KK201J	20	Solid	.357	Fused Kapton Tape	None, Twisted	.087”	10 lbs.
NN201J	20	Solid	.357	Nylon	Nylon	.068 x .120”	11 lbs.
TF201J	20	Solid	.357	(TFE) tape, Teflon	(TFE) tape, Teflon	.065 x .110”	10 lbs.
TX201J	20	Solid	.357	Extruded (FEP) Teflon	Extruded (FEP) Teflon	.072 x .124”	11 lbs.
GG241J	24	Solid	.877	Glass Braid	Glass Braid	.047 x .081”	4 lbs.
KK241J	24	Solid	.877	Fused Kapton Tape	None, Twisted	.063”	5 lbs.
PP241J	24	Solid	.877	Polyvinyl Chloride	None, Rip-Cord	.048 x .096”	4 lbs.
TF241J	24	Solid	.877	(TFE) tape, Teflon	(TFE) tape, Teflon	.047 x .078”	5 lbs.
GG261J	26	Solid	1.394	Glass Wrap	Glass Braid	.040 x .065”	3 lbs.
GG281J	28	Solid	2.216	Glass Wrap	Glass Braid	.037 x .059”	3 lbs.
GG301J	30	Solid	3.520	Glass Wrap (Braid avail.)	Glass Braid	.033 x .053”	3 lbs.

ANSI: TYPE, K - Chromel / Alumel
Catalog Number	Guage Size	Conductors	*Ohms	Primary Insulation	Outer Jacket	Min-Max. O.D.	Est. Shpg. Wt. per M
GG201K	20	Solid	.590	Glass Braid	Glass Braid	.059 x .105”	8 lbs.
GG202K	20	Stranded	.538	Double Glass Braid	Glass Braid	.075 x .137”	9 lbs.
KK201K	20	Solid	.590	Fused Kapton Tape	None, Twisted	.087”	10 lbs.
RR201K	20	Solid	.590	Vitreous Silica Braid	Vitreous Silica Braid	.102 x .174”	16 lbs.
TF201K	20	Solid	.590	(TFE) tape, Teflon	(TFE) tape, Teflon	.065 x .110”	10 lbs.
TX201K	20	Solid	.590	Teflon Extruded (FEP)	Teflon Extruded	.072 x .124”	11 lbs.
GG241K	24	Solid	1.490	Glass Braid (Wrap avail.)	Glass Braid	.047 x .081”	4 lbs.
PP241K	24	Solid	1.490	Polyvinyl-Rip Cord Const.	None	.048 x .096”	4 lbs.
GG261K	26	Solid	2.370	Glass Wrap	Glass Braid	.040 x .065”	3 lbs.
GG281K	28	Solid	3.770	Glass Braid (Wrap avail.)	Glass Braid	.039 x .064”	3 lbs.
GG301K	30	Solid	5.980	Glass Wrap	Glass Braid	.033 x .053”	2 lbs.

ANSI: TYPE, T - Copper / Constantan
Catalog Number	Guage Size	Conductors	*Ohms	Primary Insulation	Outer Jacket	Min-Max. O.D.	Est. Shpg. Wt. per M
GG201T	20	Solid	.298	Glass Braid (Wrap avail.)	Glass Braid	.059 x .105”	5 lbs
TF201T	20	Solid	.298	(TFE) tape, Teflon	(TFE) tape, Teflon	.065 x .110”	10 lbs.
TX201T
GG241T	20	Solid	.298	Extruded Teflon (FEP)	Extruded Teflon	.072 x .124”	11 lbs.
NN241T
PP241T	24	Solid	.753	Nylon	Nylon	.060 x .095”	6 lbs.
TF241T	24	Solid	.753	(TFE) tape, Teflon	(TFE) tape, Teflon	.047 x .078”	5 lbs.
GG281T	28	Solid	1.905	Glass Braid (Wrap avail.)	Glass Braid	.039 x .064”	3 lbs.
GG301T	30	Solid	3.025	Glass Wrap	Glass Braid	.033 x .053”	2 lbs.

ANSI: TYPE, E - Chromel / Constantan
Catalog Number	Guage Size	Conductors	*Ohms	Primary Insulation	Outer Jacket	Min-Max. O.D.	Est. Shpg. Wt. per M
GG201E	20	Solid	.704	Glass Braid	Glass Braid	.059 x .105”	8 lbs.
GG241E	24	Solid	1.780	Glass Braid	Glass Braid	.047 x .081”	4 lbs.

*ohms per double foot at 20°C (68°F).

White Papers

Noise in thermocouple circuits

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