Mineral Insulated Thermocouples

MT 3 MI Thermocouple

APPLICATION

Mineral insulated thermocouples are used for temperature measurements between -200 until + 1,150 °C within gaseous and fluid mediums. A mineral insulated thermocouple consists out of jacket tube, thermo wires of thermo pair and magnesium oxide. The jacket material depends on the to be measured temperature: 1.4571 stainless steel up to 800 °C or 2.4816 Inconel up to 1,150 °C. Isolation of the internal wires consists out of high sealed magnesium. Thermo pair wires are standardized as isolated from the jacket. Mineral insulated thermocouples are available as single or double element.


This construction guarantees:

  • high reliability due the special protection of the inner conductor
  • fast reaction because of the high thermal conductibility of the magnesium oxide
  • high mechanical resistance due to outer metal jacket

Mineral insulated thermocouple advantages:

  • flexibility (minimum bending radius is 5x OØ of jacket wire)
  • vibration proof
  • fast reaction
  • high electric strength, as well with small dimensions
  • producible in large nominal lengths

Disadvantages:

  • insulation resistance failure with humidity penetration (hygroscopic insulation material)
  • cement pot head, 120 °C temperature max


Mineral insulated thermocouples are multifunctional. Most common application ranges are machinery and equipment constructions, polymer processing industries, ovens as well as chemical industries.

MT 3 MI Thermocouple

Please find following our leads for MT 3 model MI Thermocouples.

Fe-CuNi type L, type J + NiCr-Ni type K

diameter terminal box leads max. temperature
0,5 mm Ø 3 x 22 mm PTFE/PTFE
GLS/GLS DHG
260 °C
400 °C
0,5 mm Ø 4 x 22 mm PTFE/PTFE
GLS/GLS DHG
Kapton/Kapton
GLS/Kapton
260 °C
400 °C
350 °C
400 °C
0,75 mm Ø 3 x 22 mm PTFE/PTFE
GLS/GLS DHG
260 °C
400 °C
0,75 mm Ø 4 x 22 mm PTFE/PTFE
GLS/GLS DHG
Kapton/Kapton
GLS/Kapton
260 °C
400 °C
350 °C
400 °C
1,0 mm Ø 3 x 22 mm PTFE/PTFE
GLS/GLS DHG
260 °C
400 °C
1,0 mm Ø 4 x 22 mm PTFE/PTFE
GLS/GLS DHG
Kapton/Kapton
GLS/Kapton
260 °C
400 °C
350 °C
400 °C
1,5 mm Ø 3 x 22 mm PTFE/PTFE
GLS/GLS DHG
260 °C
400 °C
1,5 mm Ø 4 x 22 mm PTFE/PTFE
GLS/GLS DHG
Kapton/Kapton
GLS/Kapton
260 °C
400 °C
350 °C
400 °C
2,0 mm Ø 6 x 30 mm PTFE/PTFE
GLS/GLS DHG
Kapton/Kapton
GLS/Kapton
260 °C
400 °C
350 °C
400 °C
3,0 mm Ø 6 x 30 mm PTFE/PTFE
GLS/GLS DHG
Kapton/Kapton
GLS/Kapton
260 °C
400 °C
350 °C
400 °C
4,5 mm Ø 6 x 30 mm PTFE/PTFE
GLS/GLS DHG
Kapton/Kapton
GLS/Kapton
260 °C
400 °C
350 °C
400 °C
6,0 mm Ø 8 x 50 mm PTFE/PTFE
GLS/GLS DHG
Kapton/Kapton
GLS/Kapton
260 °C
400 °C
350 °C
400 °C

    Miniature - round plugs with screw connection

    2-pin plug T3200 A# 1200716
      socket T3201 A# 1200721

     

     

    2-pin plug T3260 A# 1201415

     

    4-pin plug T3200 A# 1103624
      socket T3301 A# 1200723

    Round plugs with screw connection

    3-pin plug T3079 A# 1103631
      socket T3080 A# 1200749

     

     

    5-pin plug T3260 A# 1103635
      socket T3084 A# 1200750

     

    3-pin plug T3008 A# 1103627

     

     

    5-pin plug T3012 A# 1119173

     

    Thermocouple plug connectors

    J type plug A9.1 A# 1107127
      socket A10.1 A# 1107128
      with cross section 2x0,50 mm² A# 1349300
        2x0,22 mm² A# 1349299

     

     

    J type plug A9.2 A# 1107127
      socket A10.2 A# 1107128
      with cross section 2x0,50 mm² A# 1349300
        2x0,22 mm² A# 1349299

    Miniature - Thermocouple plug connectors

    J type mini plug A12.1 A# 1269361
      mini socket A13.1 A# 1269362
      ferrule 2x0,50 mm² A# 1269363

     

     

    J type mini plug A12.2 A# 1209147
      mini socket A13.2 A# 2104331
      ferrule   A# 1269363

    Duplex - Thermocouple plug connectors

    J type duplex plug   A# 1209139
      duplex socket   A# 1209144
      strain relief 2x1,00 mm² A# 1349298
      with cross section 2x0,50 mm² A# 1349300
        2x0,22 mm² A# 1349299

     

     

    J type duplex plug   A# 2105264
      duplex socket   A# 1302891
      strain relief 2x1,00 mm² A# 1349298
      with cross section 2x0,50 mm² A# 1349300
        2x0,22 mm² A# 1349299

    Miniature Duplex - Thermocouple plug connectors

    J type duplex mini plug A# 2105183
      duplex mini socket A# 1209140
      ferrule A# 1269363

     

     

    J type duplex mini plug A# 2105186
      duplex mini scoket A# 2105188
      ferrule A# 1269363

    Miniature plug connectors

    Lemo cable Ø max. in mm        
      sizes 0S 1S 2S 3S
      standard scoket 3,7 4,2 4,2 4,2
      fitting socket        
      standard plug 3,7 4,2 4,2 4,2

    Clamping screws

    Clamping screws are variable adjustable at the sensor tube. It is a save and sealed connection at process entry. An advantages of the clamping screws is the easy assembly and disassembly of the Temperature Sensor. Various designs in various materials and threads for different diameters are available.

    M10x1 clamping screw

    part# 1358666
    thread M10x1
    thread length 8 mm
    total length ca. 33 mm
    key size of
    screw nut
    12 mm
    internal Ø 6,2 mm
    sealing ring Ø 6,2 mm
    material nickel
    plated steel

    M10x1 clamping screw

    part# 1216718
    thread M10x1
    thread length 8 mm
    total length ca. 33 mm
    key size of
    screw nut
    14
    internal Ø 6,2 mm
    sealing ring Ø 6,2 mm
    material stainless
    steel

    G 1/8" clamping screw

    part# 1364567
    thread G 1/8"
    thread length 8 mm
    totale length ca. 33 mm
    key size of
    screw nut
    14
    internal Ø 6,2 mm
    sealing ring Ø 6,2 mm
    material phosphated
    steel

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