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Type J Thermocouple - Technical Information



Type J - Copper vs Copper-Nickel, IEC 60584-1

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 InsulationRugged 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 TipFast response thermocouples ideal for industrial and other applications.
Type J Miniature
Thermocouples
Miniature Type J ThermocouplesIdeal for precision temperature measurements where minimal displacement and a fast response is required.
Type J Heavy Duty
Thermocouples
Heavy Duty Type J ThermocouplesFor industrial applications such as furnaces, kilns, ovens, boliers, flues etc. Many types of sheath material available.
General Purpose
Type J Thermocouples
General use Type J ThermocouplesA 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 ThermocouplesA 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
Thermocouple Output Tolerances
to IEC 60584-1
+ Leg - Leg 100ºC 500ºC 1000ºC Continuous Short Term 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 +20 to +700 –180 to +750 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.

Cable Colour Codes for Type J Thermocouples

International Colour Code
to IEC 60584-3
BS 1843ANSI/MC96.1DIN 43714NFC 42324
Free Guide to Thermocouple and Resistance Thermometry

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© 1998- TC Ltd., PO Box 130, Uxbridge, UB8 2YS, United Kingdom.
Tel.: 01895252222, Fax: 01895 273540, Email: info@tc.co.uk