Thermocouple Wire

A thermocouple is a temperature measuring device consisting of two conductors of dissimilar metals or alloys that are connected only at the ends. When the ends are at different temperatures a small voltage is produced in the wire that can be related directly to the temperature difference between the ends. If the temperature at one end is known, the temperature at the other end can be determined.
Thermocouple wire or extension grade wire is recommended to be used to connect thermocouples to the sensing or control instrumentation. The conditions of measurement determine the type of thermocouple wire and insulation to be used. Temperature range, environment, insulation requirements, response, and service life should be considered.

Calibration Type Characteristics

TYPE J (Iron vs Constantan) is used in vacuum, oxidizing, inert or reducing atmospheres. Iron element oxidizes rapidly at temperatures exceeding 538'C, and therefore heavier gauge wire is recommended for longer life at these temperatures.

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.

TYPE T (Copper vs Constantan) is used or service in oxidizing, inert or reducing atmospheres or in vacuum. It is highly resistant to corrosion from atmospheric moisture and condensation and exhibits high stability at low temperatures. It is the only type with limits of error guaranteed for cryogenic temperatures.

TYPE E (CHROMEL vs Constantan) may be used in oxidizing, inert or dry reducing atmospheres, or for short periods of time under vacuum. Must be protected from sulfurous and marginally oxidizingatmospheres. Produces the highest EMF per degree o any standardized thermocouple.

Abbreviations in our web

ZONZEN supplies products and services to meet a variety of industry and customer specifications. Many are listed below

Abbreviations

AMS
ANSI
ASTM
BAC
CSA
IEC
IEEE
ISO
MIL STD
NCSL
NEC
UL

.
AMS 2750
ANSI MC96.1
ANSI/NCSL Z540-1

ASTM E207
ASTM E 220
ASTM E 230

BAC-5621
CSA-C22.2 No. 239
IEC 584
IEEE 383
IS0 Guide 25

ISO 9001-2000
MIL-STD-105
MIL-STD-45662A
NEC Article 340
NEC Article 501
NEC Article 725
NEC Article 727
UL 13
UL 62
UL 83
UL 1277
UL 1581
UL 2250

Aerospace Material Specification
American National Standard Institute
American Society of Testing and Materials
Boeing Aircraft Corporation
Canadian Standards
International Electrotechnical Commission
Institute of Electrical and Electronic Engineers
International Standards Organization
Military Standard
National Conference of Standard Laboratories
National Electrical Code
Underwriters Laboratories

Specifications

Pyrometry
Temperature Measurement Thermocouples
Calibration Laboratories and Measuring and Test Equipment
General Requirements
Thermal EMF Test of Single Thermoelement Materials
Calibration of Thermocouples by Comparison Techniques
Standard Specification and EMF Tables for Standardized
Thermocouples
Temperature Control For Processing Materials
Control and Instrumentation Cable
Thermocouples
Standard Test for Class 1E Cables for Nuclear Generation Stations
General Requirements for the Competence of Calibration and
Testing Laboratories
ISO 9001-2000 Quality Management
Sampling Procedures and Tables for Inspection by Attributes
Calibration System Requirements
Power and Control Tray Cable
Class 1 Locations
Remote-Control, Signaling and Power-Limited Circuits
Instrumentation Tray Cable
Power-Limited Circuit Cable
Flexible Cord and Fixture Wire
Thermoplastic-Insulated Wires and Cables
Electrical Power and Control Tray Cables
Reference Standard for Electrical Wires, Cables, and Flexible Cords
Instrumentation Tray Cable

Properties of Insulating and Jacketing Materials

Material Type	Continuous Operating Temperature	Abrasion Resistance	Chemical Resistance	Moisture Resistance	Solvent Resistance	Flame Resistance
PE	80°C	Good	Excellent	Excellent	Excellent	Poor
CPE	90°C	Very Good	Excellent	Excellent	Excellent	Excellent
PVC	105°C	Very Good	Very Good	Good	Fair	Excellent
TPE	125°C	Excellent	Poor	Good	Good	Excellent
Nylon	121°C	Excellent	Very Good	Fair	Good	Poor
ETFE	150°C	Excellent	Excellent	Excellent	Excellent	Excellent
FEP	200°C	Excellent	Excellent	Excellent	Excellent	Excellent
TE/D	200°C	Excellent	Excellent	Excellent	Excellent	Excellent
PFA	260°C	Excellent	Excellent	Excellent	Excellent	Excellent
PTFE	260°C	Good	Excellent	Excellent	Excellent	Excellent
Polyimide	260°C	Excellent	Excellent	Excellent	Good	Good
B-Fiber*	260°C	Good	Good	Fiar	Good	Good
G-Glass*	510°C	Poor	Good	Good	Excellent	Excellent
Q-Glass*	704°C	Fair	Good	Good	Excellent	Excellent
HG	982°C	Poor	Good	Poor	Excellent	Excellent
CEFIR(TM)	1204°C	Fair	Good	Fair	Excellent	Excellent

Standard Wire Data

A.W.G Size	Stranding	Approx. O.D.	A.W.G Size	Stranding	Approx. O.D.
30	7/38	.012	16	7/24	.060
30	19/42	.012	16	19/29	.058
28	7/36	.015	14	7/22	.073
28	19/40	.016	14	19/27	.076
26	7/34	.019	12	7/20	.096
26	19/38	.020	12	19/25	.093
24	7/32	.024	10	37/26	.110
24	19/36	.024	10	105/30	.111
24	7/30	.030	8	133/29	.161
22	19/34	.031	6	133/27	.202
20	7/28	.037	4	133/25	.255
20	/19/32	.037	2	665/30	.331
18	7/26	.048	-	-	-
18	19/30	.050	-	-	-

Metric Conversion Chart

		Stranded		Diameter
AWG Size	MM*	N x OD inches	MM	Inches	MM
10	5.3	1 x .102 7 x .0385	2.59 .978	.102 .116	2.59 2.95
	4.0	1 x .089 7 x .0335	2.26 .850	.089 .100	2.26 2.55
12	3.32	1 x .081 7 x .032	2.05 .813	.081 .096	2.05 2.44
	2.5	1 x .070 7 x .0266	1.78 .670	.070 .080	1.78 2.01
14	2.07	1 x .064 7 x .0253	1.63 .635	.064 .076	1.63 1.93
	1.5	1 x .054 7 x .0206	1.38 .520	.054 .063	1.38 1.57
16	1.32	1 x .051 7 x .0201	1.29 .511	.051 .060	1.29 1.53
	1.0	1 x .045 7 x .0169	1.13 .430	.045 .051	1.13 1.30
18	.812	1 x .0407 x .0159 19 x .010	1.02 .406 .254	.040 .048 .050	1.02 1.22 1.27
	.75	1 x .039 7 x .0146	1.00 .370	.039 .044	1.00 1.11
20	.52	1 x .032 7 x .0126	.813 .320	.032 .038	.813 .970
	.50	1 x .03157 x .0118	.800 .300	.0315 .035	.800 .900
22	.325	1 x .0257 x .010	.635 .254	.0253 .030	.635 .790
24	.205	1 x .020 7 x .008	.511 .203	.0201 .024	.511 .610
26	.128	1 x .0159	.406	.0159	.406
28	.080	1 x .0126	.320	.0126	.320
30	.051	1 x .010	.254	.010	.254
32	.032	1 x 008	.203	.008	.203
34	.020	1 x .0063	.160	.0063	.160
36	.013	1 x. 005	.127	.005	.127

Colour Codes