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Thermocouples

Welcome to the official thermocouples catalog and online store for Nordic Sensors Industrial Inc.'s temperature measurement products, including Thermocouples, RTDs, Thermowells, Wire, Hardware, Controllers and Accessories.
Feel free to browse through our large selection of products to customize your thermocouples or RTD with our online configuration tools today. We manufacture top-quality thermocouples, and offer fast and personal service and great pricing.
Whether for OEM use, or thermocouple replacement, we have it all. Configure your product and buy online on our website or Call us today at 1 888 667-3421 (Canada and US) or use our contact form to discuss your thermocouple requirements.

GENERAL PURPOSE THERMOCOUPLES

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INDUSTRIAL PROCESSES THERMOCOUPLES

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HEAVY DUTY AND SPECIAL APPLICATIONS THERMOCOUPLES

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GENERAL PURPOSE RTD'S

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What is a Thermocouple?

Thermocouple is the connection of two wire legs designed to creates a difference voltages dependent on temperature . Thermocouples are mainly used as thermometers, and can be used in making energy supplies energy to electric. Thermocouples can measure a large temperature range and are usually cheap and equipped with a standard electrical connection. Thermocouples are very accurate, and their typical error is more than a one degree Celsius. The linkage of each two different metals will produce a difference in temperature-dependent voltages. Actual use in alloys and metal cost-known features are repeated, and various combinations of metals for various temperature ranges and selecting the metal also depends on compliance with the terms workspace (resistance to corrosion , for example). Calibration The thermocouple is usually done in advance, and in addition it is customary to calibrate the measurement while facing additional thermocouple measurement device in order to minimize the measurement error resulting from differences in ambient temperature. Thermocouples are widely used in science and industry; applications include temperature measurement for kilns, gas turbine exhaust, diesel engines, and other industrial processes. Thermocouples are also used in homes, offices and businesses as the temperature sensors in thermostats, also as flame sensors in safety devices for gas-powered major appliances.

Types of Thermocouples

Certain combinations of alloys have turned out to be popular as industry standards. Choice of the mix is driven by cost, accessibility, comfort, dissolving point, chemical properties, strength, and yield. Different types are most appropriate for various applications. They are generally chosen on the basis of the temperature range and sensitivity required. Thermocouples with low sensitivities (B, R, and S sorts) have correspondingly less resolutions. Other selection criteria include the chemical inertness of the thermocouple material and whether it is magnetic or not. Standard thermocouple sorts are listed below with the positive electrode (assuming Tsense > Tref) first, followed by the negative electrode.

Type Temperature range (°C) Tolerance class (°C) Color code
Continuous Short-term One Two IEC BS ANSI
Low High Low High
B +200 +1700 0 +1820 N/A 600 – 1700: ±0.0025×T No standard No standard Not defined
Chromel/AuFe -272 +300 N/A N/A Reproducibility 0.2% of the voltage.
Each sensor needs individual calibration.
E 0 +800 −40 +900 -40 – 375: ±1.5
375 – 800: ±0.004×T
-40 – 333: ±2.5
333 – 900: ±0.0075×T
IEC Type E Thermocouple
BS Type E Thermocouple
MC 96.1 E Thermocouple Grade Color Code
J 0 +750 -180 +800 -40 – 375: ±1.5
375 – 750: ±0.004×T
-40 – 333: ±2.5
333 – 750: ±0.0075×T
IEC Type J Thermocouple
BS Type J Thermocouple
MC 96.1 J Thermocouple Grade Color Code
K 0 +1100 -180 +1300 -40 – 375: ±1.5
375 – 1000: ±0.004×T
-40 – 333: ±2.5
333 – 1200: ±0.0075×T
IEC Type K Thermocouple
BS Type K Thermocouple
MC 96.1 K Thermocouple Grade Color Code
N 0 +1100 -270 +1300 -40 – 375: ±1.5
375 – 1000: ±0.004×T
-40 – 333: ±2.5
333 – 1200: ±0.0075×T
IEC Type N Thermocouple
BS Type N Thermocouple
MC 96.1 N Thermocouple Grade Color Code
R 0 +1600 -50 +1700 0 – 1100: ±1.0
1100 – 1600: ±0.003×(T − 767)
0 – 600: ±1.5
600 – 1600: ±0.0025×T
BS Type N Thermocouple
BS Type R Thermocouple
Not defined
S 0 +1600 −50 +1750 0 – 1100: ±1.0
1100 – 1600: ±0.003×(T − 767)
0 – 600: ±1.5
600 – 1600: ±0.0025×T
BS Type R Thermocouple
Not defined
T −185 +300 −250 +400 −40 – 125: ±0.5
125 – 350: ±0.004×T
−40 – 133: ±1.0
133 – 350: ±0.0075×T
IEC Type T Thermocouple
BS Type T Thermocouple
MC 96.1 T Thermocouple Grade Color Code

RTDs

Resistance thermometers, likewise called resistance temperature detectors (RTDs), are sensors used to quantify temperature. Numerous RTD components comprise of a length of fine wire wrapped around a ceramic or glass core yet different developments are additionally utilized. The RTD wire is an immaculate material, ordinarily platinum, nickel, or copper. The material has an exact resistance/temperature relationship which is utilized to give a sign of temperature. As RTD components are delicate, they are regularly housed in defensive probes. RTDs, which have higher exactness and repeatability, are gradually taking over thermocouples in industrial applications underneath 600 °C.

Thermowell

Thermowells are tubular fittings used to protect temperature sensors installed in industrial processes. A thermowell consists of a tube closed at one end and mounted in the process stream.