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Base Metal Thermocouples with Thermowells / Protection Tubes
Base Metal Thermocouples
Base metal thermocouples represent one of the most widely adopted temperature-measurement technologies across industry due to their stable thermoelectric behaviour, broad operating range, and cost-effective durability. Made with nickel, iron, and copper based alloys, these sensors exhibit predictable Seebeck response characteristics, and provide constant thermal tracking in medium and high temperature regimes.
Base-metal thermocouples provide good resistance to mechanical fatigue, vibration, oxidation, and cyclic thermal loading when properly designed with mineral insulated (MI) construction, ceramic insulators, and high-integrity sheath materials. Types K, J, T, E, and N remain the primary classifications, serving environments ranging from cryogenic systems up to ~1300°C, depending on metallurgical composition.
For process industries that require fast roll response, high repeatability, and robust field reliability in either a heavy industrial or continuous processing environment, base metal thermocouples serve as a practical and well understood means of measurement.
Tempsens engineers base metal thermocouple assemblies with thermowells and protection tubes for demanding industrial environments—from high-pressure vessels to molten metal applications. Both thermowells and protection tubes enable sensor removal, replacement, and calibration without shutting down the process, supporting continuous operation and extending service life. Adherence to ASME PTC 19.3, Drilled Bar Stock Thermowell is determined to assure engineering reliability in these conditions
Protection tubes – which are ceramic, alloy, or composite – are used where the environment includes high thermal flux, molten metals, slag, carburisation, or chemical attack. They are intended to provide thermal conduction while protecting the sensing element from the extreme environmental conditions.
T-730
T – 730 THERMOCOUPLE WITH N/U/N & STRAIGHT THERMOWELL
T-731
T – 731 THERMOCOUPLE WITH STRAIGHT THERMOWELL & FITTING
T-732
T – 732 THERMOCOUPLE WITH N/U/N & STEPPED THERMOWELL
T-733
T – 733 THERMOCOUPLE WITH BUILT UP FABRICATED THERMOWELL
T-734
T – 734 THERMOCOUPLE WITH THERMOWELL & FLANGE WITH PROTECTION TUBE
T-729
T – 655 THERMOCOUPLE WITH NIPPLE & STRAIGHT THERMOWELL
T-656
T – 656 THERMOCOUPLE WITH TAPERED THERMOWELL & ADJUSTABLE COMPENSATION FITTING
T-657
T – 657 THERMOCOUPLE WITH SOLID SINTERED TUNGSTEN CARBIDE THERMOWELL
T-726
T – 726 THERMOCOUPLE WITH NIPPLE & FLANGE THERMOWELL TAPER
T-727
T – 727 THERMOCOUPLE WITH N/U/N & FLANGE THERMOWELL TAPER
T-728
T – 728 THERMOCOUPLE WITH FLANGE THERMOWELL TAPERED & ADJUSTABLE COMPENSATION FITTING
T-729
T – 729 THERMOCOUPLE WITH NIPPLE & STRAIGHT THERMOWELL
T-504
T – 504 THERMOCOUPLE WITH STRAIGHT THERMOWELL, ADJUSTABLE COMPENSATION FITTING & CABLE
T-506
T – 506 THERMOCOUPLE WITH THERMOWELL & COATING
T-651
T – 651 THERMOCOUPLE WITH N/U/N & TAPER THERMOWELL
T-652
T – 652 THERMOCOUPLE WITH NIPPLE & STRAIGHT THERMOWELL
T-653
T – 653 THERMOCOUPLE WITH N/U/N & STRAIGHT THERMOWELL
T-650
T – 650 THERMOCOUPLE WITH NIPPLE & TAPER THERMOWELL
T-654
T – 654 THERMOCOUPLE WITH STRAIGHT THERMOWELL, ADJUSTABLE COMPRESSION FITTING
T-503
T – 503 THERMOCOUPLE WITH TAPER THERMOWELL & ADJUSTABLE FLANGE
T-502
T – 502 THERMOCOUPLE WITH THERMOWELL & ADJUSTABLE FLANGE
T-501
T-501 THERMOCOUPLE WITH THERMOWELL
About Base Metal Thermocouples with Thermowells / Protection Tubes
| Type | J, K, T, E, N |
| Element size | 1.2,1.6,2.0,2.5,3.2 mm Other sizes on request |
| Sheath Diameter | 3.0, 4.5, 6.0, 8.0 mm Other sizes on request |
| Sheath Material | SS304, SS321, SS316, SS310, Inconel 600 |
| Thermowell Material | HRS 446, Inconel 600/601/800, Nickel, Hastalloy, etc. |
| Configuration | Simplex/ Duplex/ Multipoint |
Types of Base Metal Thermocouple
| Type | Material | Temperature Range | Application | Working Environment | |
|---|---|---|---|---|---|
Type J Thermocouple | Iron / Constantan | Up to 750°C | General-purpose use, laboratory furnaces, batch heat treatment | Inert media, Oxidizing media, Reducing media, Vacuum | |
Type K Thermocouple | Chromel / Alumel | Up to 1250°C | Furnaces, reformers, kilns, reactors, petrochemical equipment | Inert media, Oxidizing media | |
Type T Thermocouple | Copper / Constantan | Up to 350°C | Cryogenic systems, pharmaceutical processing | Inert media, Oxidizing media, Reducing media, Vacuum | |
Type E Thermocouple | Chromel / Constantan | Up to 900°C | Aerospace test rigs, calibration labs, research instrumentation | Inert media, Oxidizing media | |
| Type N Thermocouple | Nicrosil / Nisil | Up to 1300°C | Steel plants, reformer heaters, petrochemical furnaces | Inert media, Oxidizing media |
FAQ
Frequently Asked Questions
Find answers to frequently asked questions related to Base Metal Thermocouples with Thermowells / Protection Tubes.
Base metal thermocouples utilize alloys of nickel, iron, or copper, and are appropriate for medium to higher temperature ranges while being extremely mechanically robust. Noble metal thermocouples utilize platinum-rhodium alloys, allowing for extremely high temperature ranges (in excess of 1950 °C in some cases), low drift, and general applications requiring higher measurement stability and longevity.
Base metal thermocouples are extremely popular in steel mills, cement kilns, chemical reactors, refineries, boilers, industrial furnaces and general process heating systems for their mission-critical temperature sensing, control and monitoring functionality.
