Mineral insulated

MI sheathed thermocouples

Mineral-insulated, metal-sheathed thermocouples with high sensitivity, pressure resistance and flexibility; super-fine versions down to 0.1 mm.

MI sheathed thermocouples

Thermocouple conductors in a metal sheath packed with compacted mineral insulation and annealed, giving high sensitivity, pressure and shock resistance and good mechanical strength.

  • Types SK, SE, SJ, ST, SN, SR, SS, SC
  • Sheath diameters from 0.1 mm to 8.0 mm
  • Grounded, ungrounded or exposed junctions
Temperature range
-200 ~ 1700 °C
Types
K, E, J, T, N, R, S, C
Sheath diameter
0.1, 0.25, 1.0, 1.6, 2.0, 2.3, 3.2, 4.8, 6.4, 8.0 mm
Sheath material
SUS304, SUS310, SUS316, Inconel 600
Hot junction
Grounded, ungrounded, exposed
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Super-fine sheathed thermocouples

SUPER-FINE sheathed thermocouples combine excellent insulation, pressure resistance and flexibility.

  • Very fast response from the small diameter
  • Flexible and easy to install
  • Noticeably longer life than conventional thermocouples
  • High vibration resistance, with corrosion-resistant sheath options
Model
ST-04-1T / ST-04-2T
Sheath diameter
0.25 / 0.5 mm
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MINERAL INSULATED

Models

Sheath materials

MaterialNormal useMax. temperatureAtmosphere
SUS 304850 °C900 °CN V O R
SUS 316 / 316L900 °C900 °CN V O R
SUS 3101050 °C1090 °CN V O R
446SS1050 °C1100 °CN V O R
Inconel 6001050 °C1090 °CN V O R
Incoloy 8251050 °C1090 °CN V O R
Nicrobell1100 °C1250 °CN V O R
Pt/Rh 10 %1400 °C1700 °CN B O

N: neutral V: vacuum B: sulphur corrosion O: oxidising R: reducing

Hot junction types

JunctionResponseNoise immunityNote
GroundedFastPoorSusceptible to electrical noise; not for hazardous areas
UngroundedSlowerExcellentSuitable for hazardous areas
ExposedFastestPoorNot for corrosive, high-pressure or high-temperature use
MINERAL INSULATED

Full product list

8 products, grouped by type. Specifications as published by Thermoway; custom versions available on request.

MI Sheath Thermocouple

SUPER-FINE MI Sheath Thermocouple

ultra-fast response from a small 0.1-0.5 mm sheath with low heat capacity
High flexibility, minimum bend radius 2x the sheath outer diameter
Longer service life than conventional thermocouples despite smaller, lighter build
High mechanical strength and vibration resistance, sheath materials selectable for corrosive or extreme-temperature use
More specifications
Customized service for user environments
Models
ST-04-1T, ST-04-2T

MI Sheath Thermocouple

Fast response from a small, low-heat-capacity sheath
Flexible, bends to 2x the sheath outer diameter
Longer service life than conventional thermocouples
Composite construction tolerates heavy vibration
More specifications
Sheath material selectable for corrosive or extreme-temperature settings
Handles about 350 MPa at 650°C despite the small diameter

Super Fine

Super Fine (3) Sheath Thermocouple

Super-Fine MI Sheath Thermocouples (Models ST-04-1T and ST-04-2T): ultra-fast response from a 0.1-0.5 mm sheath with low heat capacity
High flexibility, minimum bend radius 2x the sheath outer diameter
Long service life, lighter and smaller diameter than conventional thermocouples
High mechanical strength and pressure resistance, withstands high vibration, suits corrosive and extreme-temperature environments with appropriate sheath materials

Mineral Insulated Sheath Cable

Precious Metal Sheath Cable

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