Thermocouple Grade

Thermocouple wire is used in the manufacture of thermocouple sensors and may be calibrated at temperatures above 200°C(392°F). It is exposed to high oven, furnace, and other process temperatures.

Thermocouple Extension Grade

Thermocouple extension vire is used to connect a thermocouple temperature sensor to a measurement or control device such as a transmitter, controller, recorder, or PLC. Extension wire is calibrated for operating temperatures below 200°C(392°F). Runs should not exceed 150 meters (500ft) with consideration for electrical noise pickup and grounding practices.



ANSI Letter Designations
ANSI LetterConductor Polarity & Material
 ( + )( - )
TCopperConstantan
JIronConstantan
EChromelConstantan
KChromelAlumel
RPlatinumPlatinum, 13% Rhodium
SPlatinumPlatinum, 10% Rhodium
BPlatinum,30% RhodiumPlatinum, 6% Rhodium
NNicrosilNisil

ANSI Insulation Colour Coding & Magnet Check
ANSI LetterSingleOuter JacketMagnetic?
 ( + )( - ) YesNo
TBlueRedBlue (+) & (-)
JWhiteRedBlack(+)(-)
EPurpleRedPurple (+) & (-)
KYellowRedYellow(-)(+)
R & SBlackRedGreen (+) & (-)
BGreyRedGrey (+) & (-)
NOrangeRedOrange (+) & (-)

  • Thermocouple grade wire has a brown outer jacket.
  • Braided insulations (ie. fibreglass) may have a coloured tracer
  • Extruded insulations (ie. PVC) will be a solid colour
  • The RED conductor is always of negative polarity.
  • ANSI: American National Standards Institute, standard MC96.1

Temperature Ratings of Insulation Materials
MaterialCont. Op. Temp Range C&F
PVC - Polyvinyl Chloride-40 to 105 °C (-40 to 221°F)
NYL - Nylon-51 to 149 °C (-60 to 300°F)
FEP - Teflon-68 to 260 °C (-90 to 500°F)
TZL - Tefzel-68 to 260 °C (-90 to 500°F)
KAP - Kapton-20 to 316 °C (-4 to 600°F)
FGG - Fibreglass0 to 482 °C (32 to 900°F)
HFG - High Temp. Fibreglass0 to 704 °C (32 to 1300°F)
CFR - Ceramic Fibre0 to 1204 °C (32 to 2200°F)

Registered Trade Names
  • Kapton (KAP), Nylon (NYL), Teflon (FEP), Tefzel (TZL), Mylar ... Dupont Co
  • Nextel (CFR) ... 3M Co.
  • Chromel(K+), Alumel (K-) ... Hoskins Co.
  • Alloy 11(R & S -) ... Harrison Driver Harris
  • Alloy 30-6 ... Carpenter Technology

ANSI Limits of Error for Thermocouple Grade Wire
ANSI LetterStandard Limits of Error ( whichever is greater )Special Limits of Error ( whichever is greater)
T+/- 1.0°C(1.8°F) or +/- 0.75%+/- 0.5°C(0.9°F) or +/- 0.4%
J+/- 2.0°C(4.0°F) or +/- 0.75%+/- 1.1°C(2.0°F) or +/- 0.4%
E+/- 1.7°C(3.1°F) or +/- 0.5%+/- 1.0°C(1.8°F) or +/- 0.4%
K+/- 2.2°C(4.0°F) or +/- 0.75%+/- 1.1°C(2.0°F) or +/- 0.4%
R&S+/- 1.5°C(2.7°F) or +/- 0.25%+/- 0.6°C(1.1°F) or +/- 0.1%
B +/- 0.5%--
N+/- 2.2°C(4.0°F) or +/- 0.75%+/- 1.1°C(2.0°F) or +/- 0.4%

NOTE: Special quarter limits of error available upon request.

Operating Temp. Range for Thermocouple Grade Wire
ANSI LetterRange
T-184°C (-300°F) to 371°C (700°F)
J0°C (32°F) to 760°C (1400°F)
E0°C (32°F) to 871°C (1600°F)
K&N0°C (32°F) to 1260°C (2300°F)
R&S538°C (1000°F) to 1482°C (2700°F)

ANSI Limits of Error for Thermocouple Extension Wire
Operating Temp. Range: 0°C (32°F) to 200°C (392°F)
ANSI LetterStandard Limits of Error
( whichever is greater )
Special Limits of Error
( whichever is greater )
TX+/- 1.0°C (1.8°F)+/- 0.5°C (0.9°F)
JX+/- 2.0°C (4.0°F)+/- 1.1°C (2.0°F)
EX+/- 1.7°C (3.1°F)+/- 1.0°C (1.8°F)
KX+/- 2.2°C (4.0°F)+/- 1.1°C (2.0°F)
RX & SX+/- 5.0°C (9.0°F)N/A
BX+/- 5.0°C (9.0°F)N/A
NX+/- 2.2°C (4.0°F)+/- 1.1°C (2.0°F)

NOTE: Types R,S & B extension wire for Platinum thermocouples is Copper(+) and an Alloy of Copper (-).

How to Specify Single & Multipair Wire & Cable

#TT __ __ [1] - __ [2] - __ __ __ - __ - __ __ __

Conductor
Gauge
Ansi
Calibration
Ins. & Jacket
Material
Options
(Wire)
Options
(Cable)
16 or 16ST or TXPVC"L" - Spec. Limits
18 or 18SJ or JXNYLof Error
20 or 20SK or KXFEP"B" - Stainless Steel
24 or 24SE or EXTZLOverbraid
30 or 30SN or NXKAP"S" - Shield, Twisted
 RX, SX, or BXFGGwith Drainwire
  HFG 
  CFR 

[1] - "S" - Stranded conductor, otherwise solid
[2] - "X" - Extension Grade, otherwise Thermocouple Grade

MultiPair Thermocouple Extension Cable

Add to Options in above catalogue number as follows:
  • XPR - "X" No. of twisted pairs (ie. 4PR is 4 pairs), cabled
  • OVS - Overall Al mylar shield with drainwire
  • IOS - Individual pair and overall Al mylar shield with drainwire
  • SIA - Steel (galvanized) interlocked armour, PVC jacket
  • AIA - Aluminum interlocked armour, PVC jacket
  • UUL - UL Approved for USA
  • CUL - UL Approved for Canada
  • CSA - CSA Certified
  • FT4 - Flame Test 4 rated outer jacket
  • CHL - Hazardous Locations rated
  • 300 - 300 Volt insulation rating
  • 600 - 600 Volt insulation rating
  • SPE - Other special features
Examples:
  • #TT16S-K-FGG-B - Specifies #16 gauge stranded conductor, type K calibration, thermocouple grade, fibreglass insulation with stainless steel overbraid, single pair wire
  • #TT20-JX-PVC-6PR-IOA-CSA-FT4-300 - Specifies #20 gauge solid conductor, type J calibration, extension grade, PVC insulation, 6 twisted pairs, individual & overall shield, CSA certified, Flame Test 4, 300V insulation rating, multipair cable

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