Products

Thermocouple Sensors

We custom manufacture all thermocouple sensors to your specification. Both Base metal and noble metal thermocouples are available, typically shipped within five days


Typical Thermocouple Probes

Mineral Insulated
Thermocouples
Mineral Insulated ThermocouplesOur most popular thermocouple style, these rugged sensors, ideal for most applications. Vast choice of terminations e.g. pot seals, Wire, connectors, heads etc.
Swaged Tip
Thermocouples
Swaged Tip ThermocouplesFast temperature response time thermocouple probes ideal for industrial and other applications.
Miniature
Thermocouples
Ideal for precision temperature measurements where minimal displacement and a fast response is required.
Heavy Duty
Thermocouples
For industrial applications such as furnaces, kilns, ovens, boilers, flues etc. Many types of sheath material available.
High Temperature Thermocouples High Temperature ThermocoupleVarious thermocouples specifically for high temperature applications. Wide choice of sheath materials and terminations. General Purpose
Thermocouples
Thermocouple - General PurposeA wide range of thermocouples to suit many applications. Hand held, surface, bayonet, bolt, low cost simple styles, patch sensors etc.
AMS2750 Approved
Thermocouples
AMS2750 approved ThermocouplesCalibrated thermocouples designed to meet the high quality and accuracies demanded for heat treatment and vacuum furnace applications
Industrial Vacuum
Thermocouples
Vacuum Thermocouples Ceramic sheathed calibrated thermocouples designed specifically in vacuum furnace applications with very low leak rates
ATEX/IECEx Approved
Thermocouples
ATEX approved ThermocouplesA large range of thermocouples with a variety of terminations such as pot seal, terminal heads etc.

What is a thermocouple?

A thermocouple is a relatively simple device to measure temperature. Thermocouple sensors are comprised of two wires of different metals joined (welded) together to form a measuring junction (also known as a hot junction). This junction is usually enclosed in a metal sheath and is inserted into the medium where the temperature is to be measured. The opposite end of the two wires are also (effectively) joined at a point known as the cold junction. A more detailed explanation of Thermocouples can be found here.

How does a thermocouple probe work?

As the temperature at the hot junction changes, it creates a thermal gradient between the hot and cold junctions which generates an electron flow and a resultant electromotive force (EMF), measured in Millivolts. The voltage measured at the ends of the conductors is a function of the temperature difference along the conductor length. This effect was discovered by TJ Seebeck in 1822 and is known as The Seebeck Effect.

When used with a temperature instrument, the cold junction is electronically referenced to 0ºC and a formula is applied to the millivolt signal, which can then be converted to °C or °F, using instrumentation. A more detailed explanation of Thermocouple Theory can be found here.

Calibration Types

There are several different thermocouple calibration types (K Type thermocouples, J Type, T Type, N Type, R Type etc) each with different characteristics and covering various temperature ranges. Type K is one the most popular thermocouples used in industrial applications, due to its versatility and wide temperature range, T type thermocouples are generally preferred in applications below 0ºC and Type R thermocouples are preferred in furnace thermocouple applications. A detailed list of the different thermocouple types along with color code information and other characteristics can be found here.

Technical Data - Accuracy and Temperature Range

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
Type + Leg - Leg 100ºC 500ºC 1000ºC Continuous Short Term Type Class 1 Class 2
K NICKEL - CHROMIUM
Also known as: Chromel™,
Thermokanthal KP*, NiCr,
T1*, Tophel™
NICKEL - ALUMINIUM
(magnetic)
Also known as: Ni-Al, Alumel™,
Thermokanthal KN™, T2™, NiAl™
42 43 39 0 to +1100ºC -180 to +1350ºC Temperature Range
Tolerance Value
Temperature Range
Tolerance Value
–40°C to +375°C
±1.5°C
375°C to 1000°C
±0.004 ⋅ [t]
–40°C to +333°C
±2.5°C
333°C to 1200°C
±0.0075 ⋅ [t]
T COPPER
COPPER - NICKEL
Also known as: Constantan,
Advance™, Cupron™
46 –185 to +300°C –250 to +400°C Temperature Range
Tolerance Value
Temperature Range
Tolerance Value
–40°C to +125°C
±0.5°C
125°C to 350°C
±0.004⋅ [t]
–40°C to +133°C
±1.0°C
133°C to 350°C
±0.0075 ⋅ [t]
J IRON
(magnetic)
Also known as: Fe
COPPER - NICKEL
Also known as:
Nickel-Copper,
Constantan, Advance™,
Cupron™
54 56 59 +20 to +700°C –180 to +750°C 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 NICKEL - CHROMIUM -SILICON
Also known as: Nicrosil
NICKEL - SILICON - MAGNESIUM
Also known as: Nisil
30 38 39 0 to +1150ºC -270 to +1300ºC Temperature Range
Tolerance Value
Temperature Range
Tolerance Value
–40°C to +375°C
±1.5°C
375°C to 1000°C
±0.004⋅ [t]
–40°C to +333°C
±2.5°C
333°C to 1200°C
±0.0075⋅ [t]
E NICKEL - CHROMIUM
Also known as: Chromel™,
Tophel™, Chromium, Nickel
NICKEL - ALUMINIUM
Also known as: Nickel-Copper,
Constantan, Advance™,
Cupron™
68 81 0 to +800ºC -40 to +900ºC Temperature Range
Tolerance Value
Temperature Range
Tolerance Value
–40°C to +375°C
±1.5°C
375°C to 800°C
±0.004⋅ [t]
–40°C to +333°C
±2.5°C
333°C to 900°C
±0.0075 ⋅ [t]
S PLATINUM - 10% RHODIUM
PLATINUM
8 9 11 0 to +1550ºC -50 to +1750ºC Temperature Range
Tolerance Value
Temperature Range
Tolerance Value
0°C to +1100°C
±1.0°C
1100°C to 1600°C
±(1 +0.003 (t ⋅ 1100)°C
0°C to +600°C
±1.5°C
600°C to 1600°C
±0.0025 ⋅ [t]
R PLATINUM - 13% RHODIUM
PLATINUM
8 10 13 0 to +1600ºC -50 to +1700ºC Temperature Range
Tolerance Value
Temperature Range
Tolerance Value
0°C to +1100°C
±1.0°C
1100°C to 1600°C
±(1 +0.003 (t ⋅ 1100)°C
0°C to +600°C
±1.5°C
600°C to 1600°C
±0.0025 ⋅ [t]
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.

ANSI and IEC Color Codes

for Thermocouple Wires

Thermocouple
Type
United States
ANSI MC96.1
International Color Code
to IEC 60584-3
Redundant national colour coding for thermocouple cables
Thermocouple Grade Extension Grade BS 1843 DIN 43714 NFC 42324
K ANSI MC96.1 Type K Thermocouple Wire ANSI MC96.1 Type K Extension IEC60584-3 Type K Thermocouple Wire BS1843 Type K Thermocouple DIN 43714 Type K Thermocouple NFC 42324 Type K Thermocouple
T ANSI MC96.1 Type T Thermocouple Wire ANSI MC96.1 Type T Extension IEC60584-3 Type T Thermocouple Wire BS1843 Type T ThermocoupleDIN 43714 Type T Thermocouple NFC 42324 Type T Thermocouple
J ANSI MC96.1 Type J Thermocouple Wire ANSI MC96.1 Type J Extension IEC60584-3 Type J Thermocouple Wire BS1843 Type J ThermocoupleDIN 43714 Type J Thermocouple NFC 42324 Type J Thermocouple
N ANSI MC96.1 Type N Thermocouple Wire ANSI MC96.1 Type N Extension IEC60584-3 Type N Thermocouple Wire BS1843 Type N Thermocouple
E ANSI MC96.1 Type E Thermocouple Wire ANSI MC96.1 Type E Extension IEC60584-3 Type E Thermocouple Wire BS1843 Type E ThermocoupleDIN 43714 Type E Thermocouple NFC 42324 Type E Thermocouple
S -- ANSI MC96.1 Type S Extension IEC60584-3 Type S Thermocouple Wire BS1843 Type S Thermocouple DIN43714 Type S Thermocouple NFC 42324 Type S Thermocouple
R -- ANSI MC96.1 Type R Extension IEC60584-3 Type R Thermocouple Wire BS1843 Type R Thermocouple

Detailed information on thermocouple wire tolerances and ranges can be found here.

Sheath Materials

In addition to ceramic sheaths and the wide range of designs featured in our general purpose thermocouples, our most popular mineral insulated thermocouples are available with the following sheath materials:

AISI 304 Stainless Steel - AISI 304, 316L and 310 Grades


304 Stainless Steel has good corrosion resistance for general purpose usage. Used in food service and biological applications. Do not use in 800°F to 1600°F temperature range due to carbide precipitation. Maximum Temperature: 1650°F.

Grade 316L Stainless Steel has good high temperature corrosion resistance and suitable for use in sulphur bearing atmospheres. 316L stainless steel has high oxidation resistance. Maximum Temperature: 1650°F.

Finally, Grade 310 Stainless Steel has good high temperature corrosion resistance and suitable for use in sulphur bearing atmospheres. 310 stainless steel has high oxidation resistance. Maximum Temperature: 2010°F.

Inconel 600®



Used in severely corrosive atmospheres to elevated temperatures. Has good resistance to oxidation. Not recommended for use above 1470°F when used with Type R, S or B thermocouples. Do not use in sulphur bearing atmospheres above 1020°F. Maximum Temperature: 2010°F.

Incoloy 800® and Incoloy 825®



Suitable for use in severely corrosive atmospheres to elevated temperatures. Enjoys a good resistance to oxidation and carburisation. Incoloy 800 is resistant to sulphur bearing atmospheres. Maximum Temperature: 1650°F. Incoloy 825® is an Iron/Nickel/Chromium alloy with additions of molybdenum, copper, and titanium. Exceptional resistance to many corrosive environments. Resistant to chloride-ion stress-corrosion cracking. Maximum Temperature: 2280°F.

AISI 446


Suitable for use in severely corrosive atmospheres to elevated temperatures. Particularly suited for use in high concentration sulphur bearing atmospheres at high temperature. Sensor should be mounted vertically at temperatures above 1290°F. Maximum Temperature: 2100°F.

Hastelloy X® and Hastelloy C276®



For use in reducing, neutral and inert atmospheres. Has improved high temperature resistance to oxidation and attack by sulphur. At high temperature it has excellent tensile strength and develops a tightly adherent oxide film which does not spall. Maximum Temperaure: 2230°F. Hastelloy C276® has eExcellent corrosion resistance to both oxidizing and reducing media and excellent resistance to localized corrosion attack. Excellent resistance to sulphur compounds and chloride ions. Maximum Temperature: 1250°F.

Nicrotherm D™


For high temperature Type ‘K’ and almost all Type ‘N’ applications (optimum benefits with Type ‘N’). Very good high temperature strength. Excellent in oxidising, carburising, reducing and vacuum atmospheres. Do not use in sulphur containing atmospheres. Maximum Temperature: 2280°F.

Platinum 10% Rhodium


Primarily for use with thermocouple types R, S and B. Suitable for high temperature oxidizing atmospheres and inert atmospheres. Maximum Temperature: 2550°F.


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Thermocouple Sensors
Mineral Insulated Thermocouples
Thermocouples with Mini Plug
Thermocouples with Terminal Head
Thermocouples with Wire
High Temperature Thermocouples
General Purpose Thermocouples
IECex/ATEX Thermocouple Sensors
Ceramic Thermocouple Sensors
Fast Response Thermocouple Sensors
Autoclave Thermocouple Sensors
Surface Measurement Thermocouple Sensors
FEP Insulated Thermocouple

Platinum Resistance Thermometers
Mineral Insulated RTD Pt100 Sensors
Rigid Stem RTD Pt100 Sensors
Hand Held RTD Pt100 Sensors
Surface Measurement RTD Pt100 Sensors
RTD Pt100 Sensors with Wire
RTD Pt100 Sensors with Mini Plug
Autoclave RTD Pt100 Sensors
RTD Pt100 with Terminal Head
IECex/ATEX Platinum Resistance Thermometers
Fast Response RTD Pt100 Sensors
Air Temperature RTD Pt100 Sensors
Magnetic RTD Pt100 Sensors
Wire
PVC Single Pair Thermocouple and Extension Wire
PFA Single Pair Thermocouple and Extension Wire
Fiberglass Single Pair Thermocouple & Extension Wire
PVC Multipair Thermocouple Wire
PFA Multipair Thermocouple Wire
Fiberglass Multipair Thermocouple Wire
PVC RTD Pt100 Wire
PFA RTD Pt100 Wire
Fiberglass RTD Pt100 Wire

Miniature Thermocouple Connectors
Mini Thermocouple Connectors – 410ºF Rated
Mini Thermocouple Connectors – 660ºF Rated
Mini Thermocouple Connectors – 1200ºF Rated
Mini Thermocouple Connector Accessories
Mini Thermocouple Connector Panels
Mini Three Pin Connectors

Standard Thermocouple Connectors
Standard Thermocouple Connectors – 410ºF
Standard Thermocouple Connectors – 660ºF Rated
Standard Thermocouple Connectors – 1200ºF Rated
Standard Thermocouple Connector Accessories
Standard Thermocouple Connector Panels
Standard Three Pin Connectors
Instrumentation
Hand Held Indicators
Temperature Transmitters
Temperature Controllers
Temperature Calibrators
Chart Recorders
Multi Channel Indicator
DIN Rail Mounted Transmitters
Head Mounted Transmitters
IECEx/ATEX Rated Transmitters
Dry Block Calibrator
Temperature Dataloggers

Temperature Accessories
Compression Fittings
Pressure and Vacuum Feedthroughs
IECEx/ATEX Compression Fittings

Calibration
Calibration Services


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