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Mineral Insulated Thermocouples

with Miniature Plug

  • High integrity construction suited to arduous operating conditions at temperatures from -200ºC to +1250ºC
  • Custom built to your specification and terminated in a choice of miniature thermocouple plugs rated to 220ºC, 350ºC or 650ºC
  • Alternatively, we have a large range of sensors available to buy online in various diameters and lengths
  • High accuracy and stability maintained throughout the operating life of the sensor
  • Fast response and high insulation resistance
  • Available in thermocouple types K, T, J, N, E, R, S & B with sheath diameters from 0.25mm to 3.0mm and lengths from a few millimetres to 200 metres or more dependent on the sheath diameter selected

Enquiry Form

1. Thermocouple Type

2. Sheath Material

3. Sheath Diameter

4. Sheath Length


5. Types of Sensing Junction

Illustration Select
EXPOSED Junction
Duplex Element Required? (please tick box)
Triplex Element Required? (please tick box)

6. Miniature Plug Style

Illustration Select
3P6M - Miniature Plug
Plastic, rated to 220ºC (normal)
3P6MH - Miniature Plug
Plastic, rated to 300ºC
3P6MC - Miniature Plug
Ceramic - rated to 650ºC

7. Optional Compression Fitting

8. Quantity Required

Contact Details

Company Name

Your Name



Additional Information

If your enquiry is for more than one style of sensor, please email us with your requirements or use the box below

Send Enquiry  

1 Thermocouple Type Temperature Range (continuous) Temperature Range
(short term)
KNickel Chromium vs
Nickel Aluminium
0°C to +1100°C -180°C to +1350°C
T Copper vs Constantan -185°C to +300°C -250°C to +400°C
J Iron vs Constantan +20°C to +700°C -180°C to +750°C
N Nicrosil vs Nisil 0°C to +1100°C -270°C to +1300°C
E Nickel Chromium vs Constantan 0°C to +800°C -40°C to +900°C
R Platinum - 13% Rhodium vs
0°C to +1600°C -50°C to +1700°C
S Platinum - 10% Rhodium vs
0°C to +1550°C -50°C to +1750°C
B Platinum - 30% Rhodium vs
Platinum 6% Rhodium
+100°C to +1600°C +100°C to +1820°C
Temperature ranges refer to the thermocouple type.
The temperature range of the sensor may deviate from the above,
please refer to the product description for more details
2 Sheath Material Max.
Standard Sheath Materials

321 Stainless Steel

310 310 Stainless Steel 1100°C
600 Inconel 600 1100°C
Specialized Sheath Materials
601 Inconel 601 1175°C
800 Incoloy 800 1100°C
825 Incoloy 825 1100°C
114 Nicrobell D 1250°C
446 AISI 446 1150°C
156 Hastelloy X 1220°C
276 Hastelloy 276 1100°C
160 Haynes 160 1200°C
P10R Platinum 10% Rhodium 1400°C
* 5.5mm diameter is a thick wall heavy duty construction

Hot junction insulated from sheath. Gives floating output with typical insulation resistance in excess of 100 megohms

Hot junction welded to sheath tip giving earthed output and faster response to temperature changes

Fastest response mainly for the measurement of air temperature in ducts. Restricted to a maximum operating temperature of 300ºC