A Thermocouple is an electrical device consisting of two dissimilar electrical conductors forming electrical junctions at differing temperatures. A thermocouple produces a temperature-dependent voltage as a result of the thermoelectric effect, and this voltage can be interpreted to measure temperature.
A thermocouple is a sensor for measuring temperature. It consists of two dissimilar metals, joined together at one end. When the junction of the two metals is heated or cooled a voltage is produced that can be correlated back to the temperature. The thermocouple alloys are commonly available as wire.
What are the different thermocouple types?
A thermocouple is available in different combinations of metals. The four most common calibrations are J, K, T and E. There are high temperature calibrations R, S, and B. Each calibration has a different temperature range and environment, although the maximum temperature varies with the diameter of the wire used in the thermocouple. Although the thermocouple calibration dictates the temperature range, the maximum range is also limited by the diameter of the thermocouple wire. That is, a very thin thermocouple may not reach the full temperature range.
How to select a thermocouple type
Because a thermocouple measures in wide temperature ranges and can be relatively rugged, thermocouples are very often used in industry. The following criteria are used in selecting a thermocouple:
Chemical resistance of the thermocouple or sheath material
Installation requirements (may need to be compatible with existing equipment; existing holes may determine probe diameter)
|Pressure Ratings||Up to 11 000 psig (760 bar), Medium-Pressure - Up to 20 000 psig (1378 bar) High-Pressure - Up to 60 000 psig (4134 bar).|
|Types||NPT, ISO/BP, SAE/MS, AN, weld ends|
|Sizes||1/16 to 2 in.; 2 to 50 mm, Medium-Pressure - 1/4, 3/8, 1/2, 9/16, 3/4, 1 in.; 6, 10, 12 mm High-Pressure - 1/8 to 9/16 in.|
|Temperature Ratings||Up to 1000°F (537°C)|
|Monel :||Grade: Monel 400, Monel K500, Monel R-405|
|Nickel :||Grade: Nickel 200, Nickel 201|
|Inconel :||Grade: Inconel 600, Inconel 601, Inconel 625, Inconel 718|
|Incoloy :||Grade: Incoloy 800, Inconel 800H, 800HT|
|Hastelloy :||Grade: Hastelloy B2, Hastelloy B3, Hastelloy C22, Hastelloy C276, Hastelloy X|
|Titanium :||Grade: Gr1, Gr2, Gr3, Gr5, Gr7, Gr11|
|Stainless Steel :||Grade: ASME / ASTM SA / A403 SA / A 774 WP-S, WP-W, WP-WX, 304, 304L, 316, 316L, 304/304L, 304H, 316H, 316/316L, 321, 330, 347, 309/S, 310/S, 317/L, 333, 410/S, DIN 1.4301, DIN1.4306, DIN 1.4401, DIN 1.4404|
|Carbon Steel :||Grade: ASTM A 234 WPB , WPBW, WPHY 42, WPHY 46, WPHY 52, WPH 60, WPHY 65 & WPHY 70|
|Duplex Steel:||Grade: ASTM / ASME A/SA 182 UNS F44, F45, F51, F53, F55, F60, F61|
|Alloy Steel:||Grade : ASTM SA 182 - E25, E26, E27, E28, E29B, E30B, E39B, E40B, E36B, E36C, E41B, AISI4130, AISI4140, AISI4340, 42CRMO4, 16MNCR5, 20MNCR5, 21CrMoV57, EN353, EN354, F11, F22, F91, F9, P11, P22, P91, P9, P5, P92, EN42J, EN8, EN19|
|UNS S30400 Thermocouple Manufacturer||Duplex Steel S31803 Thermocouple|
|Thermocouple Hydraulic Fitting Exporter||WERKSTOFF Nr. 2.4816 Thermocouple Manufacturer|
|Stainless Steel Thermocouple Manufacturer||SS 316 Thermocouple Fittings|
|UNS S31600 Thermocouple Distributors||Super Duplex Steel 2205 Thermocouple Exporters|
|Positionable Thermocouple Supplier||UNS R50400 Thermocouple Fittings|
|Thermocouple Compression Fitting||SS 304 Thermocouple Fittings|
|Thermocouple Instrumentation Fitting||DIN 2.4360 Thermocouple|
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