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Type J Thermocouple - Technical Information



Type J - Copper vs Copper-Nickel

Thermocouple Type J, commonly referred to as Iron/Constantan, this is one of the few thermocouples that can be used safely in reducing atmospheres. However, in oxidising atmospheres above 550°C, degradation is rapid. Maximum continuous operating temperature is around 800°C, although for short term use, temperatures up to 1,000°C can be handled. Minimum temperature is -210°C, but beware of condensation at temperatures below ambient - rusting of the iron arm can result, as well as low temperature embrittlement.

Type J Thermocouples - Typical Constructions and Styles

Type J Mineral Insulated
Thermocouples
Type J Thermocouples with Mineral Insulation

Rugged sensors, ideal for most applications. Vast choice of terminations e.g. pot seals, cables, connectors, heads etc.

Type J Swaged Tip
Thermocouples
Type J Thermocouples with Swaged Tip

Fast response thermocouples ideal for industrial and other applications.

Type J Miniature
Thermocouples
Miniature Type J Thermocouples

Ideal for precision temperature measurements where minimal displacement and a fast response is required.

Type J Heavy Duty
Thermocouples
Heavy Duty Type J Thermocouples

For industrial applications such as furnaces, kilns, ovens, boilers, flues etc. Many types of sheath material available.

General Purpose
Type J Thermocouples
General use Type J Thermocouples

A wide range of thermocouples to suit many applications. Hand held, surface, bayonet, bolt, patch styles etc.

ATEX/IECEx Approved
Type J Thermocouples
ATEX Approved Type J Thermocouples

A large range of thermocouples with a variety of terminations such as pot seal, terminal heads etc.

Type J - Technical Data

Conductor Combination Approximate generated
EMF change in µV
per ºC change
(referenced to 0ºC) at:
Approximate Working
Temperature Range
Initial Calibration Tolerances to ASTM E-230
(whichever is greater)
Thermocouple Output Tolerances
to IEC 60584-1
+ Leg - Leg 100ºC 500ºC 1000ºC ºF ºC Standard Special Type Class 1 Class 2 Class 3
IRON
(magnetic)
Also known as: Fe
COPPER - NICKEL
Also known as:
Nickel-Copper,
Constantan, Advance™,
Cupron™
54 56 59 32 to 1400 0 to 760 ±2.2 or ±0.75% ±1.1 or ±0.4% Temperature Range
Tolerance Value
Temperature Range
Tolerance Value
–40°C to +375°C
±1.5°C
375°C to 750°C
±0.004⋅ [t]
–40°C to +333°C
±2.5°C
333°C to 750°C
±0.0075 ⋅ [t]
N/A

1. The tolerance is expressed either as a deviation in degrees Celsius or as a function of the actual temperature.

2. Thermocouple materials are normally supplied to meet the tolerances specified in the table for temperatures above –40 deg C. These materials however, may not fall within the tolerances for low temperatures given under Class 3 for Types T, E and K thermocouples. If thermocouples are required to meet limits of Class 3, as well as those of Class 1 and/or Class 2, the purchaser should state this, as selection of materials is usually required.

What Color is Type J Thermocouple Wire?

ANSI MC96.1 United StatesInternational Color Code
to IEC 60584-3
Redundant national colors
Thermocouple Grade Extension Grade BS 1843 DIN 43714
ANSI MC96.1 Type J ThermocoupleANSI MC96.1 Type J ExtensionIEC60584-3 Type J ThermocoupleBS1843 Type J ThermocoupleDIN 43714 Type J Thermocouple

Please click here for all thermocouple wire color codes.

Common Type J Thermocouple Sensors for Temperature Measurement Applications

Thermocouples with Basic End Seal 0.010" to 0.313" dia. Type J Thermocouple Basic SealInternal seal with bare conductors Type J Thermocouples with Pot Seal 0.010" to 0.313" dia.

a large selection of plain and threaded pot seals supplied with tails or extension Wire (PVC, FEP, Fiberglass etc.)

Thermocouple Probes with Miniature Plug 0.010" to 0.125" dia.

fitted with a miniature thermocouple plug rated to either 428ºF, 572ºF, 797ºF or 1112ºF

Thermocouples with Miniature Jack
0.010" to 0.125" dia.

fitted with a miniature thermocouple jack rated to either 428ºF, 572ºF, 797ºF or 1112ºF

with Standard Plug
0.062" to 0.250" dia.

fitted with a standard thermocouple plug rated to either 428ºF, 572ºF, 797ºF or 1112ºF

with Standard Jack
0.062" to 0.250" dia.

fitted with a standard thermocouple jack rated to either 428ºF, 572ºF, 797ºF or 1112ºF

with Lemo Connector
0.125" to 0.250" dia.
fitted with a size 1 Lemo plug
or jack
with Terminal Entry Gland
0.040" to 0.313" dia.
terminated with a 16mm ISO x 1.5mm compression gland seal supplied with tails or extension Wire (PVC, FEP Fiberglass etc.)
with Micro die cast alloy head 0.125" to 0.250" dia. Micro die cast alloy screw down terminal head with ceramic terminal block. Suitable for simplex and duplex assemblies with Miniature IP67 die cast head 0.125" to 0.313" dia.Weatherproof die cast alloy screw top terminal head with ceramic terminal block. Suitable for simplex and duplex assemblies with Standard IP67 die cast head 0.188" to 0.500" dia. Weatherproof die cast alloy screw top terminal head with ceramic terminal block. Suitable for simplex, duplex and triplex assemblies
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